EP1000559A2 - Bag with zip-lock closure actuated by a slider - Google Patents

Abstract

The bag (10) consists of two basically flat layers (16, 18) forming its side walls with interlocking closure strips (20, 22) along their opening edges. It is opened and closed by a slider (50) which has a central projection (59) of varying cross-section to part the strips, and ribs (520, 540) on either side of its opening to press the edges of the bag together and ensure a seal when the bag is closed. The bag can also have seal lips inside the closure strips.

Description

The present invention relates to the field of sachets comprising complementary closure profiles actuated respectively at opening and closing with a cursor.

Such sachets are described, for example, in documents EP-A-0051010, EP-A-0102301 and EP-A-0479661.

Generally the sliders have two side wings connected between them at a base and which define, with a sole elongated central unit placed between the closing profiles, two converging passage for additional closing profiles nestable. So when the relative direction of movement of the cursor by compared to the closing profiles tends to move the cursor by forcing the closing profiles in engagement, the bag is closed. On the contrary when the cursor is moved in the opposite direction, the bag is opened, thanks to the central sole that separates the closure profiles.

These sachets activated at opening and closing by a slider have already done great service.

The sliders make it easier to open and close the sachets. The presence of a cursor is particularly appreciated by elderly or visually impaired people.

However, the majority of known slider bags do not give totally satisfied. In particular, most of these sachets do not do not have a complete seal in the closed position of the profiles. This leak is due to the fact that the profiles remain separate, in front of the slider, due to the presence of the central sole placed between the closing profiles.

Sealing is however demanded in many applications, in particular but not limited to the sachets used for freezing food products.

We tried to remedy this drawback by cutting in the closing profiles or in the film, near the end receiving the slider in the closed position of the bag, so that the sole cursor enters this slice or is located between portions of film independent of the closing profiles, and allows a perfect engagement of the profiles over their entire length, in the closed position. An example of such means can be found in documents US-A-5067208, US-A-5442837 and US-A-5020194.

Nevertheless the means proposed in this context prove to be strong complex. They do not always allow a perfect seal sachets. In addition, they have the major drawback of not retaining the cursor perfectly and therefore to cause for example a risk of the cursor being ingested by young children.

Other solutions have also been proposed in which the central sole of the slider is mounted to move thereon between an active position in which said sole is placed between the profiles closing, and a retracted position in which the sole is away from the closing profiles. An example of such means can be found in document WO-A-98/23493.

The latter solutions theoretically improve sealing of the bags. However in practice they turn out to be too complex, since sealing is not guaranteed if the user forgets to move the sole of the slider to the retracted position. Furthermore these solutions are sometimes unreliable, to the extent or after many manipulations, the sole can be permanently separated from cursor.

The present invention now aims to improve the performance of known slider bags.

The main purpose of the present invention is to provide sachets having a greater seal than that of the earlier sachets known.

Another object of the present invention is to propose means limiting the risk of inadvertent removal of the cursor, in particular in order to limit the risk of ingestion by young children.

Another object of the present invention is to propose means allowing a high productivity rate in automatic.

These objects are achieved in the context of the present invention by to a bag comprising two generally parallel sheets forming the main walls of the bag, additional closure profiles fixed respectively on these sheets at the mouth of the bag and a cursor comprising two lateral wings connected to each other at the level a base, placed on the outside of the sheets at the mouth of the bag and which define with a central sole elongated, two converging passage lanes for the profiles of additional closure, characterized in that the sole is interrupted back from the longitudinal end of the cursor, at least on the widest side of the cursor corresponding to the divergent side of passageways, and that the side wings are provided in the vicinity of their free edge opposite the base, means for urging the sheets of the sachet in reconciliation, covering the entire longitudinal extent of the sole and extending longitudinally beyond on either side thereof, to seal the bag in its closed position.

• les figures 1 à 3 représentent trois vues schématiques en coupe transversale d'un sachet équipé d'un curseur conforme à la présente invention, selon des vues référencées respectivement I-I, II-II et III-III sur la figure 4,
• la figure 4 représente une vue en coupe longitudinale médiane d'un curseur conforme à la présente invention, selon le plan de coupe référencé IV-IV sur les figures 1 à 3,
• la figure 5 représente une autre vue en coupe longitudinale du curseur selon le plan de coupe référencé V-V sur la figure 4,
• les figures 6 à 16 illustrent selon des vues en coupe transversale similaires à la figure 1, une première série de variantes de réalisation conformes à la présente invention,
• les figures 17 à 34 illustrent une seconde série de variantes de réalisation conformes à la présente invention, et
• les figures 35 à 44 illustrent une troisième série de variantes de réalisation conformes à la présente invention.

Other characteristics, aims and advantages of the present invention will appear on reading the detailed description which follows and with reference to the appended drawings, given by way of nonlimiting examples and in which:

• FIGS. 1 to 3 represent three schematic cross-sectional views of a bag equipped with a slider in accordance with the present invention, according to views referenced respectively II, II-II and III-III in FIG. 4,
• FIG. 4 represents a view in median longitudinal section of a cursor in accordance with the present invention, according to the cutting plane referenced IV-IV in FIGS. 1 to 3,
• FIG. 5 represents another view in longitudinal section of the cursor according to the section plane referenced VV in FIG. 4,
• FIGS. 6 to 16 illustrate, in cross-section views similar to FIG. 1, a first series of variant embodiments in accordance with the present invention,
• FIGS. 17 to 34 illustrate a second series of variant embodiments in accordance with the present invention, and
• Figures 35 to 44 illustrate a third series of alternative embodiments according to the present invention.

There is shown schematically in Figures 1 to 3 a bag 10 of which the mouth is referenced 12 and the bottom 14.

The bag 10 is composed of two main sheets 16, 18. These are interconnected at the bottom 14 (by folding, the two sheets 16, 18 being integral with origin as illustrated in FIGS. 1 to 3, or by welding or gluing, the two sheets 16, 18 being initially separated and superimposed during manufacture as illustrated in FIGS. 9 to 14, or by welding or gluing the edges of a single folded sheet on itself at the mouth, as illustrated for example on Figures 15 and 16), as well as at the two lateral edges perpendicular to the bottom 14 and the mouth 12 (the connection at the side edges is preferably provided by welding or gluing).

At the mouth 12, the two sheets 16, 18 are provided of complementary closure profiles 20, 22.

These complementary closure profiles 20, 22 can make the object of many embodiments. The invention is not limited to specific embodiments illustrated in the accompanying figures. We will note moreover that two variants of production of such closure profiles 20, 22, respectively on the Figures 1 to 8 and 17 and following on the one hand and in Figures 9 to 16 on the other go.

In particular, the invention applies to closure profiles 20, 22 respectively of male and female type as is well known from those skilled in the art and as shown diagrammatically in FIGS. 1 to 8 and 17 and following. However, the invention is not limited to this particular provision and can also extend for example to closure profiles 20, 22 of the hook type as illustrated in figures 9 to 16.

As illustrated in FIGS. 1 to 6, 8 to 12 and 15 in particular the complementary closure profiles 20, 22 may have come of extrusion on the sheets 16, 18 making up the sachet (more precisely on the internal surface of these sheets 16, 18 according to the embodiments of the Figures 1 to 6 and 8 to 12 and on the external surface of these sheets according to the embodiment of FIG. 15 when the sheets 16, 18 form, at the mouth of the bag, a bellows folded towards the inside of the bag to form an opening control veil).

However, according to an alternative embodiment, the profiles of closure 20, 22 can be formed initially on support webs respective 21, 23 reported on sheets 16, 18, at the level of the mouth 12 of the bag, as illustrated in FIGS. 7, 13, 14 and 16. Here again, it will be noted that according to FIGS. 7, 13 and 14 the support webs 21, 23 are fixed on the internal surface of the sheets 16, 18. However according to FIG. 16, the sheets 16, 18 forming, at the mouth of the sachet, a bellows folded towards the inside of the bag to form a control veil opening, the support webs 21, 23 are fixed on the external surface of the sheets 16, 18.

The connection between the webs 21, 23 and the films 16, 18 can be produced by any suitable conventional means, for example by welding hot or sticking.

The use of closure profiles not from extrusion on films 16, 18, but reported by welding or gluing is not illustrated on the accompanying drawings only in FIGS. 7, 13, 14 and 16. However, the use of such closure profiles 20, 22 attached to the films 16, 18 may apply to all of the variant embodiments in accordance with the invention.

As indicated above, the sachet also includes a cursor 50 whose role is to facilitate the openings and closings of the bag, by separation, respectively approximation, of the profiles of closing, when the cursor is moved to translation at the mouth of the bag.

The cursor 50 can be the subject of numerous embodiments. The cursor 50 may in particular comply with the general provisions described in document EP-A-0479661.

Preferably the cursor 50, made of plastic, comprises two lateral wings 52, 54 (or “sides”) connected together at a base 56 and which define with an elongated central sole 59, two passage lanes 590, 592 converging for the closing profiles complementary nestable 20, 22. Thus, when the meaning of relative movement of the cursor 50 relative to the closure profiles 20, 22 tends to move the cursor 50 by forcing the closing profiles 20, 22 in engagement, the bag is closed. When the cursor 50 is moved in the reverse, the bag is open.

In the context of the present invention, as indicated previously, the sole 59 is interrupted on this side (that is to say in withdrawal) from the longitudinal end of the cursor, at least on the most wide of the cursor corresponding to the divergent side of the lanes 590, 592, as seen in particular in Figures 1, 3, 4 and 5, and the side wings 52, 54 are provided in the vicinity of their free edge opposite the base 56, means 520, 540 for urging the sheets 16, 18 of the sachet into approximation, covering the entire longitudinal extent of the sole 59 and extending beyond longitudinally on either side thereof, for seal the bag in its closed position.

According to the preferred embodiment illustrated in Figures 1 to 4, these biasing means are composed of ribs 520, 540 in inward projection of the cursor 50, at the edge of the wings 52, 54 opposite the base 56, or where appropriate over part of the height of the internal surface of these wings 52, 54 lying between the free edge of the wings 52, 54 and the base 56. It will be noted that if the ribs 520, 540 are not necessarily located at the free edge of the lateral wings 52, 54, these ribs 520, 540 are however located below the sole 59 (that is to say between the top of the sole 59, opposite the base 56, and the free edge of the wings 52, 54), and not at the height thereof.

These ribs 520, 540 continuously cover the sole 59 and extend beyond it, at least at the most wide of the sole 59 corresponding to the divergent side of the corridors 590, 592. More precisely still, according to the preferred embodiment illustrated in the appended figures, the ribs 520, 540 extend over all the length of the slider 50, while the sole 59 is interrupted, at the level of its widest end (divergent side of the corridors 590, 592), at a distance I1 from the end of the cursor 50, and at its level thinner end (converging side of lanes 590, 592), one distance I2 from the end of the cursor 50.

The width I6 of the free space defined between the vertices of the ribs 520, 540 is substantially equal to the sum of the thicknesses of the sheets 16, 18, at the mouth of the sachets. So the cursor 50 solicits the sheets in approach, below the sole 59, and guarantees the tightness of the sachet.

According to the embodiment illustrated in FIGS. 1 to 5 appended, two symmetrical ribs 520, 540 and the same height are provided, one on each of the wings 52, 54. As a variant, it is possible to provide ribs 520, 540 asymmetrical. So we can only provide a rib unique on one of the wings 52, 54 of the cursor 50.

• I3 la hauteur de la semelle 59, considérée parallèlement aux ailes 52, 54 et perpendiculairement à l'embase 56,
• I4 la distance séparant l'extrémité libre de la semelle 59 opposée à l'embase 56 et les nervures 520, 540, et . I5 la largeur de la semelle 59, au niveau de son extrémité la plus large.

In the figures, reference has been made:

• I3 the height of the sole 59, considered parallel to the wings 52, 54 and perpendicular to the base 56,
• I4 the distance between the free end of the sole 59 opposite the base 56 and the ribs 520, 540, and. I5 the width of the sole 59, at its widest end.

• I1 est de préférence compris entre 1 mm et 10mm, et est très préférentiellement de l'ordre de 3mm.
• I2 est de préférence compris entre 0,5mm et 10mm, et est très préférentiellement de l'ordre de 4mm.
• I3 est de préférence compris entre 2mm et 7mm, et est très préférentiellement de l'ordre de 3mm.
• I4 est de préférence compris entre 5mm et 15mm, et est très préférentiellement de l'ordre de 8mm.
• I5 est de préférence compris entre 0,3mm et 2mm, et est très préférentiellement de l'ordre de 0,5mm.
• I6 est de préférence compris entre 50µm et 2,5mm, et est très préférentiellement de l'ordre de 200µm.

In the context of the present invention:

• I1 is preferably between 1 mm and 10 mm, and is very preferably of the order of 3 mm.
• I2 is preferably between 0.5mm and 10mm, and is very preferably around 4mm.
• I3 is preferably between 2mm and 7mm, and is very preferably around 3mm.
• I4 is preferably between 5mm and 15mm, and is very preferably around 8mm.
• I5 is preferably between 0.3mm and 2mm, and is very preferably around 0.5mm.
• I6 is preferably between 50 μm and 2.5 mm, and is very preferably of the order of 200 μm.

• le rapport I1/I5 est de préférence compris entre 0,5 et 30, et est très préférentiellement de l'ordre de 6.
• le rapport I2/I5 est de préférence compris entre 2,5 et 30, et est très préférentiellement de l'ordre de 8.
• le rapport I1/I3 est de préférence compris entre 0,5 et 5, et est très préférentiellement de l'ordre de 1.
• le rapport I2/I3 est de préférence compris entre 0,1 et 5, et est très préférentiellement de l'ordre de 1,3.
• le rapport I1/I4 est de préférence compris entre 0,05 et 2, et est très préférentiellement de l'ordre de 0,4.
• le rapport I2/I4 est de préférence compris entre 0,05 et 2, et est très préférentiellement de l'ordre de 0,5.

Furthermore, in the context of the present invention:

• the ratio I1 / I5 is preferably between 0.5 and 30, and is very preferably of the order of 6.
• the I2 / I5 ratio is preferably between 2.5 and 30, and is very preferably around 8.
• the ratio I1 / I3 is preferably between 0.5 and 5, and is very preferably of the order of 1.
• the I2 / I3 ratio is preferably between 0.1 and 5, and is very preferably around 1.3.
• the ratio I1 / I4 is preferably between 0.05 and 2, and is very preferably of the order of 0.4.
• the ratio I2 / I4 is preferably between 0.05 and 2, and is very preferably around 0.5.

In the context of the present invention, other means can be substituted for or combined with the aforementioned ribs or bosses 520, 540 to solicit the sheets 16, 18 of the bag in reconciliation.

Thus it can be provided, parallel to the closure profiles 20, 22, between said sheets 16, 18 and at the mouth 12 of the sachet, additional relief means 100 integral with the sachet designed to ensure sealing by forming a barrier between the sheets 16, 18, closed position of the bag, said additional means in relief 100 being placed opposite the sides 52, 54 of the cursor 50 to be used towards their sealing position by the cursor 50 when the latter is moved to the sealing position.

Films 16, 18, closure profiles 20, 22 and the means additional sealing 100 can be made of any material suitable plastic known to those skilled in the art. Preferably, it is polyolefin, very advantageously of low or high density polyethylene, even polypropylene.

Preferably in the context of the present invention, the means 100 are arranged on the inside of the closure profiles 20, 22 (this is say towards the inside of the bags with respect to these closure profiles 20, 22) and extend over the entire length of the sachets (i.e. have the same length as the closure profiles 20, 22).

According to the embodiment illustrated in Figure 6, said means additional seals 100 are formed by a bead 102 parallel to the section 20 and integral with one of the sheets 16. According to FIG. 6, this bead 102 came from extrusion on film 16. As a variant, however, as we have previously mentioned, the bead 102 could have come from extrusion on a support veil attached to this film 16.

Such a bead 102 is placed opposite the flanks 52, 54 of the cursor 50 and on the inside of these. Thus the bead 102 is stressed in press against the opposite film 18 when the cursor 50 is moved to position closing.

Preferably the geometry of the sections 20, 22, of the means 100 and of the cursor 50 is such that the sides 52, 54 of the cursor 50 impose on the means 100, transverse play (ie perpendicular to the sheets 16, 18) lower than that tolerated for closure profiles 20, 22.

For this, for example, when the internal surfaces of the sidewalls are parallel as illustrated in the appended figures, the thickness L1 means 100 is greater than that L2 defined by the profiles of closure 20, 22 when these are engaged.

This preferential relationship L1> L2 is not limited to the mode of embodiment of FIG. 6 but applies to all of the modes of realization of the present invention, including when said means sealing 100 are formed by two beads or else means complementary male / female or any other equivalent means, such as we will describe it later.

This provision makes it possible to guarantee that the means 100 provides a watertight barrier between the two films 16 and 18.

According to the embodiment illustrated in FIG. 7, the means sealing 100 are formed by two beads 104, 106 integral respectively of the two films 16 and 18 and placed opposite to come in contact through their tops to form a tight barrier, when they are biased by the sides 52, 54 of the cursor 50. According to FIG. 7, the two beads 104, 106 are symmetrical. Alternatively, however, one can provide beads 104, 106 asymmetrical.

According to the embodiment illustrated in FIG. 8, the means sealing 100 are formed of complementary elements 110, 112 male / female integral respectively with the internal surface of the two sheets 16, 18 of the bag. More precisely still according to FIG. 8, the female element 112 is formed by two lips 1120 and 1122 adapted for come to rest respectively on the sides of the male element 110. According to the Figure 8, the two lips 1120, 1122 are symmetrical. However in alternatively, two asymmetrical lips 1120, 1122 can be provided. Through elsewhere the mixed element 110 is generally rounded.

The sealing means 100 illustrated in FIG. 9 are identical to those of figure 8. However it will be noted that according to figure 9, the cursor 50 has bosses 520 on the internal surface of its sides 52, 54, 540 placed opposite the means 100 to guarantee the solicitation of these last in sealing position, when closing the bag. The geometry of such bosses 520, 540 can be the subject of numerous variants. Alternatively, such bosses can be provided on the surface exterior of the walls 16, 18, facing the cursor, or even such bosses on the walls of the bag and other facing bosses on the cursor 50.

Another variant embodiment according to FIG. 10 has been illustrated. which the male element 110 has a substantially triangular section. Thanks to this structure, it is guaranteed that the contact between the sides of the male element 110 and the lips 1120 and 1122 is reinforced when the male and female elements 110 and 112 are urged into reconciliation by the cursor 50.

Note also that according to Figure 10, the two lips 1120 and 1122 of the female element 112 are asymmetrical. Preferably the lip 1120 located towards the inside of the bag relative to the male element 110 is longer and more flexible than the second lip 1122 located towards the outside of the bag. Thus the internal pressure of the sachet, even possibly directly the content thereof, such as liquid content, biases the first lip 1120 elastically against the male element 110. On the other hand, the second lip 1122 resists such an effort and therefore does not does not deviate from the male element 110.

As illustrated in FIGS. 6 to 11 and 15, the means 100 can come from extrusion on the sheets 16, 18 making up the sachet (more precisely on the internal surface of these sheets 16, 18 according to the modes of realization of FIGS. 6 to 11 and on the external surface of these sheets according to the embodiment of FIG. 15 when the sheets 16, 18 form, at the mouth of the bag, a bellows folded towards the inside of the bag to form an opening control veil).

However, according to an alternative embodiment, the means 100 can be formed initially on respective support webs 121, 123 reported on the sheets 16, 18, at the mouth 12 of the bag, as illustrated in Figures 12 to 14 and 1. Again we note that according to FIGS. 12 to 14, the support webs 121, 123 are fixed on the internal surface of the sheets 16, 18. On the other hand according to FIG. 16, the sheets 16, 18 forming, at the mouth of the bag, a bellows folded inwards of the bag to form an opening control veil, the support veils 121, 123 are fixed on the external surface of the sheets 16, 18.

It will also be noted that as illustrated in FIGS. 13, 14 and 16, the support webs 121 and 123 can be merged respectively with the support webs 21 and 23 of the closure profiles 20, 22.

The connection between the webs 121, 123 and the films 16, 18 can be produced by any suitable conventional means, for example by welding hot or sticking.

The use of non-extrusion means 100 on the films 16, 18, but reported by welding or gluing is not illustrated in the drawings appended only in FIGS. 12 to 14 and 16. However, the use of such means 100 reported on films 16, 18 could apply to the whole variant embodiments in accordance with the invention.

An alternative embodiment has been illustrated in FIG. 11 appended according to which there is provided on the one hand notches 160, 180 which open out on the external surface of the bag, respectively opposite the means 100, in this case respectively opposite the female element 112 and the male element 110, and on the other hand ribs 522 and 542 projecting from the internal surface of the sides 52 and 54 of the cursor 50, which ribs 522 and 542 are adapted to penetrate respectively into said notches 160 and 180.

The cooperation thus defined between the notches 160, 180 and the ribs 522 and 542 makes it possible to improve the stress on the means 100 by the cursor 50. Indeed, it makes it possible to precisely locate the area of stress due to cursor 50. It also makes it possible to retain in all security the cursor 50 on the bag. This cooperation effectively prohibits all inadvertent withdrawal of the cursor 50.

The use of ribs 522 and 542 and complementary notches 160, 180 is illustrated in the accompanying drawings only in FIG. 11. However, the use of such ribs 522 and 542 and notches 160, 180 may apply to all variants of realization in accordance with the invention.

The embodiment of FIG. 12 has been described previously. he essentially differs from the embodiments illustrated on the previous figures by the fact that the means 100 are carried by sails respective support 121, 123 reported on sheets 16 and 18, as indicated previously.

The embodiment of FIG. 13 has been described previously. he essentially differs from the embodiments illustrated on the previous figures by the fact that the means 100 are carried by sails respective support 121, 123 combined with the support webs 21 and 23 of the profiles 20, 22 and reported on sheets 16 and 18, as shown previously.

It is the same for the embodiment illustrated in the figure 14. However, furthermore according to FIG. 14, the support webs 121, 21 and 123, 23 are interconnected by a loop 24. This is arranged on inside the means 100 and has its concavity directed towards the outside of the bag.

Thus these support sails 121, 21, 123, 23 and 24 form an anti-violation veil or opening indicator at mouth 12. effect of breaking this veil 24 before accessing the interior of the bag. This veil anti-violation 24 is formed by a bellows folded towards the inside of the sachet, at the level of the mouth 12 in the continuity of the support sails 121, 21 and 123, 23.

There are illustrated in Figures 15 and 16 alternative embodiments that such an anti-violation veil or opening witness, referenced 19, is formed by a fold in the film making up the main sheets 16, 18 of the sachet. According to FIG. 15, the profiles 20, 22 and the means 100 are come from molding on this film. On the other hand according to FIG. 16, the profiles 20, 22 and the means 100 are carried by support webs 121, 21 and 123, 23 reported on the film.

Such a bellows 19 directed towards the inside of the bag can be shaped by any suitable known means, for example using a blade acting the bellows 19 inwards between the sheets 16, 18, as is good known to those skilled in the art.

Those skilled in the art will readily understand, that conventionally in you have to break the anti-violation veil 24 or 19 to access the product contained in the bag 10.

Thus, the condition of the veil 24 or 19 makes it possible to indicate whether an intervention has whether or not occurred on the bag 10.

In order to facilitate the opening of the veil 24 or 19, it can be provided, in a manner known per se, from a line of weakness or precut, by mid-width example, as illustrated schematically under the reference 190 in Figures 15 and 16.

The sachets obtained in the context of the present invention offer many advantages compared to known prior sachets.

In particular, they allow a high productivity rate and good sealing of the bags.

In addition, the cooperation defined between notches 160, 180 and the ribs 522, 542 of the sliders 50 makes it possible to avoid any untimely withdrawal sliders 50 under the effect of the internal pressure in the sachets or else under the effect of a solicitation by a user.

Where appropriate, in the context of the embodiments illustrated in Figures 15 and 16 for which there is provided an anti-violation veil 19 formed by a fold of the film making up the bags, a weld can be provided between the internal surfaces of the main sheets 16, 18 making up the bag and the sections 162, 182 forming the bellows corresponding to the anti-intrusion veil 19 as shown schematically under the reference 60 in the figures 15 and 16.

Of course, the present invention is not limited to the modes of particular achievements which have just been described, but extends to all variants according to his spirit.

The bags according to the present invention can be produced on all types of known and appropriate machines, in particular on FFS (Form, Fill and Seal) type machines, i.e. machines designed to carry out training operations automatically, filling and closing of sachets.

Furthermore, the present invention applies equally well to in which the closure profiles are arranged longitudinally with reference to the direction of travel of the film only at implementations according to which the closure profiles are arranged transversely.

In addition, the present invention is equally applicable to implementations work according to which, the closing profiles are pre-equipped with slider when fed to the bag forming machine, than implementations where the cursor is arranged later on the profiles.

Note also that the present invention is not limited to the geometry of the notches 160, 180 and ribs 522, 542 illustrated on the Figure 11 attached. Indeed, these notches 160, 180 and ribs 522, 542 can be the subject of numerous variant embodiments as to their straight section. So for example we can consider giving notches 522, 542 a cross section with converging edges, for example in dovetail or rail-shaped (e.g. T-shaped or others). Such a provision reinforces the retention of the cursor 50 on the sachets.

As indicated above, preferably within the framework of the present invention, the sealing means 100 and the profiles of closure 20, 22 extend over the entire width of the bag. However, by definition, the cursor 50 only extends over a limited area of this width. Consequently, the cursor 50 cannot alone solicit the sealing means 100 permanently over their entire length.

As indicated above, to guarantee watertightness, you can consider giving the means 100 a thickness L1 greater than that L2 closure profiles 20, 22.

Other means can be provided to induce a pressure P transverse to the walls 16, 18 on the means 100, in the closed position of the bag to ensure a good seal. This pressure P is shown schematically in Figures 7 and 10. However, these arrangements can still apply to all of the embodiments in accordance with the present invention.

Thus, in the context of the present invention, according to a variant, the closure profiles 20, 22 are adapted to automatically secure such a request P means 100 when the bag is closed.

Different geometries of the closure profiles 20, 22 can be retained for that.

In the case of standard closure profiles male / female as illustrated in figure 7, one can for example provide a asymmetrical female profile, in particular such that L3 is less than L4, that is to say that the height or size L3 of the element 220 defining the internal lip of female profile 22 is less than the height or size L4 of element 222 defining the outer lip of the profile female 22.

Those skilled in the art will understand that with this arrangement, the element internal 220 of the female profile 22 induces a constraint on the means sealing 100 in the closed state of the bag, that is to say when the element male 20 is engaged with the female element 22 and this over any length means 100.

A similar effect can be obtained with a male profile 20 asymmetrical (combined if necessary with a female profile 22 also asymmetrical as previously indicated).

In the case of additional hook-type closure profiles as illustrated in FIG. 10, one can for example provide that the two additional hooks C1, C2 located towards the inside of the bag define in the assembled position a width L5 between the internal faces sheets 16, 18 less than the width L6 taken between the same faces sheets 16, 18 at the pair of complementary hooks C3, C4 located towards the outside of the bag. This provision ensures the same constraint over the entire length of the means 100.

An alternative embodiment is illustrated in FIG. 17 according to which the two elements 104, 106 respectively secured to the internal surface sheets 16, 18 are not positioned to bear by their vertex, as indicated previously with regard to FIG. 7, but are positioned to be juxtaposed and come to rest at their sides adjacent opposite 103, 105 generally perpendicular to the sheets 16 and 18.

It will be noted that preferably according to the illustrated embodiments in FIGS. 17 and following, the cursor 50 is provided on the ends of its lateral wings 52, 54, of respective returns 53, 55 directed inwards from the sachet. These returns 53, 55 are positioned to be located beyond the sealing means 100. On the one hand, these returns 53, 55 participate in the tightness of the bag. On the other hand, these returns 53, 55 participate in the keeping the cursor 50 on the sachets to prevent an untimely withdrawal cursor. As can be seen in FIG. 17, these returns 53, 55 request the sheets 16, 18 in approach, beyond the sealing means 100.

It will also be noted that according to the embodiments illustrated on FIGS. 17 et seq., preferably, the portions of support films 16, 18 located opposite the closure profiles 20, 22 and the means sealing 100, have a thickness greater than the thickness of the rest of the film making up the sachet. This extra thickness of the support films 16, 18 to the right of the cursor 50 makes it possible to maintain the means 100 in their sealing position when the bag is in the closed position. Such a localized excess thickness of the films 16, 18 can be obtained in the form of a excess thickness formed during extrusion of the film or else may result from the fixing of supporting webs of closure profiles 20, 22 or of the means 100, as previously indicated.

Another variant embodiment according to FIG. 18 has been illustrated. which the two elements 104, 106 respectively fixed to the surface internal of the sheets 16, 18 are provided at their top with a respective wing 1040, 1060 orthogonal audits elements. Thus said wings 1040, 1060 generally extend parallel to the sheets 16, 18. The elements 104, 106 are supported at their apex by means of these wings 1040, 1060.

According to the embodiment of Figure 18, said wings 1040, 1060 are directed towards the inside of the bag. As a variant, it can be provided that the wings 1040, 1060 are on the contrary directed towards the outside of the bag. According to yet another variant, such wings 1040, 1060 can be provided on the vertex of elements 104, 106 both inward and outward of the bag. In this case, the elements 104, 106 provided with the wings 1040, 1060 have the general shape of a T.

An alternative embodiment of the figure is illustrated in FIG. 19 17 according to which at least one of the two juxtaposed elements 104, 106 is fitted at its top with an orthogonal 1060 wing. This one is intended for come to rest against the internal face of the opposite sheet 16 to perfect sealing. According to Figure 19 there is shown such a wing 1060 on one only elements 106. As a variant, it is however possible to provide a such additional wing intended to come to rest against the internal face of the opposite sheet, on the top of the two elements 104, 106.

FIG. 20 illustrates another alternative embodiment of the Figure 17 according to which the two juxtaposed elements 104, 106 are provided at their apex with a rounded outgrowth 1042, 1062. This is intended to come to rest against the internal face of the sheet 16, 18 opposite to complete the seal. According to Figure 20, there is provided such protuberance on the two elements 104, 106. As a variant, it is possible to provide such a protrusion 1042, 1062 on a single element 104, 106. According to the Figure 20, these growths have a circular cross section and are symmetrical with respect to the median plane of the elements 104, 106. However the invention is not limited to this particular geometry.

An alternative embodiment of the figure is illustrated in FIG. 21 18 according to which the cursor 50 is further provided at the ends from each of the returns 53, 55 from an additional wing 530, 550 directed towards the base 56 of the cursor 50, that is to say towards the outside of the bag. These wings 530, 550 are thus oriented generally parallel to the lateral wings 52, 54 of cursor 50. These additional wings 530, 550 are designed to take position in the volume defined between sheets 16, 18 and 1040, 1060 sealing means 100. It is understood on examination of the figure 21 that these wings 530, 550 ensure an undulation on the sheets 16, 18 suitable for further strengthening the tightness of the bags obtained.

According to the embodiments previously described, the cursor 50 has symmetry with respect to a longitudinal plane. So according to Figures 17 to 19, each of the sides 52, 54 is provided with a return 53, 55.

However according to the variant illustrated in Figure 22, the cursor exhibits an asymmetry in the sense that only one 52 of the flanks is provided of such a return 53 directed towards the inside of the bag.

An alternative embodiment of the figure is illustrated in FIG. 23 22 according to which this return 53 is provided on its internal surface with a boss 532 directed towards the base 56 to urge the two juxtaposed elements 104, 106 supported by their adjacent sides 103, 105. For this, the boss 532 exerts on the element 104 a directed stress to base 56.

Another variant embodiment according to FIG. 24 has been illustrated. which the portions of supporting films 16, 18 carrying the profiles of closure 20, 22 and the sealing means 100 are not located in the direct extension of the leaves making up the body of the sachet, but are shifted towards the outside of the bag at the respective recesses 1600, 1800. These 1600, 1800 recesses can be obtained by extrusion during the manufacture of the film or be obtained subsequently by folding of the film. It will be understood on examining FIG. 24 that such recesses 1600, 1800 make it easier to juxtapose the sheets 16, 18 at the exit of cursor 50, although sheets 16, 18 are necessarily separated, inside the cursor due to the presence closure profiles 20, 22 and means 100.

It will also be noted on examining FIG. 24 that, where appropriate one of the 1800 recesses can itself be provided with an extension 1802 directed towards the opposite support sheet 16. This extension 1802 is designed to come to rest against the dropout, 1600 opposite so the further strengthen the tightness of the bags obtained.

FIG. 25 illustrates an alternative embodiment according to which on the one hand there is a boss 530 or return towards the interior of the cursor on the single return 53 and on the other hand an element 106 projecting from the sheet 18. As can be seen in FIG. 25, the boss 530 imposes a bending or labyrinth path to the second sheet 16 at the outlet of the cursor 50, which is again suitable for strengthening the tightness of the sachet obtained.

An alternative embodiment of the figure has been illustrated in FIG. 26. 17 according to which at least one of the two elements 104 or 106 has a increasing thickness towards its apex or has a flank inclined so that it exerts a force on the other element 106 or 104 juxtaposed, in the closed position of the bag.

We have illustrated in Figures 27 and following variants of embodiment according to which the sealing means 100 are formed essentially flexible and elastic structures, to be deformable when closing the bag, while according to the representations given in FIGS. 17 to 26, the means 100 are essentially rigid.

There is thus illustrated in FIG. 27 an alternative embodiment according to which the sealing means 100 comprise a curved lip, flexible and elastic 130 secured to the sheet 18 carrying the profile of female closure 22.

As a variant, such a flexible and elastic lip 130 could be integral with the sheet 16 which carries the male closure profile 20.

According to Figure 27 the lip 130 is formed of a cylinder sector whose angle in the center is greater than 180 °. According to Figure 27, the concavity of the lip 130 is directed towards the inside of the bag. Alternatively however provision could be made for the concavity of the lip 130 to be directed towards the outside of the bag.

As seen in Figure 27, in the closed position of the bag the top of the lip 130 comes to rest against the opposite support sheet 16. For this, as can be seen in FIG. 28, in the open state of the bag, said lip 130 extends beyond the associated closure profile 22. Thanks to this arrangement guarantees that in the closed state of the bag, said lip 130 exerts pressure on the opposite sheet 16.

An alternative embodiment of the figure is illustrated in FIG. 29 27 that the location of the lip 130 and the geometry of this lip 130 are such as said lip 130, when it rests on the sheet 16 opposite, receives a reaction which requests it itself in support against one closure profiles, in this case the female closure profile 22.

Another variant embodiment according to FIG. 30 has been illustrated. which such a biasing of the lip 130 bearing against the element of female closure 22 is reinforced by the presence on the internal surface flanks 52, 54 of the boss cursor 50 520, 540. In the present case according to the representation given in FIG. 30, these bosses 520, 540 have a profile general triangular. However, these bosses 520, 540 are not limited to this geometry and can be the subject of numerous variants of production.

Note that in Figure 30 the central sole of the cursor 50 which controls the engagement, respectively the separation of the profiles of closure 20, 22 is referenced 57.

Illustrated in FIG. 31 is a side view of a sachet thus team. We can see in this figure 26 a cursor 50 having such stressing bosses 520, 540, as well as closing profiles 20, 22 and the sealing means 100. It will be noted on examining FIG. 31 that preferably the bosses 520, 540 extend only over part of the length of the cursor 50 and also converge towards the upper base 56 of cursor 50 near the end of cursor 50 on the side opening of the bag. Thanks to this arrangement, the bosses 520, 540 stress the lip 130 in abutment against the closure profile 22, in the vicinity of the bag opening area.

Likewise the returns 53, 55 provided on the wings 52, 54 of the cursor 50 can converge on the base 56 near the end of the cursor 50 located on the side of the sachet opening, to improve the tightness of the bag at this level.

Another variant embodiment according to FIG. 32 has been illustrated. which each of the two sheets 16, 18 is provided on its internal surface of an elastic lip 130 in the cylinder sector. These two lips 130 are thus resting on their top when the bag is closed.

For that again, at rest, that is to say in the open position, at least one of the two lips 130 preferably extends beyond the profile associated closure, as shown diagrammatically in FIG. 33.

The cursor 50 used in the context of the alternative embodiment of the Figure 32 may also include stressing bosses 520, 540 ascending, as illustrated in figure 31, to urge these lips elastic 130 against the closing profiles 20, 22, in the bag closure.

Another variant embodiment according to FIG. 34 has been illustrated. which each of the two support films 16, 18 is provided with a lip elastic 130, but however these are positioned not for come to rest by their top, but to be juxtaposed laterally as can be seen in FIG. 34. For this, the two lips 130 formed each of a cylinder sector having an angle at the center greater than 180 ° have their concavity directed inward and inward respectively the outside of the bag.

We will now describe the embodiments illustrated on the Figures 35 to 44 attached.

As previously indicated, according to these variants, the sachet has on its mouth 12, means 150 located opposite said additional sealing means 100, relative to the profiles of closure 20, 22, and these means 150 are adapted to define a support between the opposite internal faces of the walls of the bag. In addition it is planned on the cursor 50 means capable of urging the walls of the sachet, towards inside, in an area of these walls between the means additional sealing 100 and the support means 150. This guarantees that said additional means 100 are biased in a position sealing, by the slider 50. Preferably this request is made to the right of closing profiles 20 and 22.

Thus preferably as can be seen in the appended figures, the additional sealing means 100 are located on the inside of the profiles closing 20, 22, while the means 150 defining the support are located on the outside of the closure sections 20, 22.

This arrangement comprising means 150 associated with biasing means of the sealing means 100 by the cursor 50, can apply to all of the variants previously described. They are therefore not limited to the embodiments of the figures 30 to 39. In particular this provision applies to all types of means 100, all types of closure profiles 20, 22 and all slider variants 50 or bag equipped with an anti-veil veil, etc ...

A variant has been illustrated in FIG. 35 according to which the means additional sealing 100 are formed by two flexible lips and elastic 170, 172, symmetrical and integral respectively with the face internal walls 16 and 18, and directed towards the inside and the bottom of the bag. In variant these lips 170, 172 can be directed towards the inside of the cursor 50 (especially for example for vacuum bags). As indicated previously the provision of support means 150 applies to all types 100 sealing means and is not limited to the means 100 of the figure 35. It can in particular be applied to lips 170, 172 not symmetrical.

Similarly according to FIG. 35, the closure profiles 20, 22 are of male / female type. However, the invention can be applied to any other type closing profiles, in particular hook profiles.

According to Figure 35, the support means 150 are formed of two symmetrical elements 152, 154, respectively fixed to the faces internal walls 16, 18, at the mouth of the bag. More again precisely according to FIG. 35, each of these elements 152, 154 has a rectangular cross section and extends towards the plane median of the bag at which these elements are in mutual support, in closed position of the bag. Thus these elements 152 and 154 extend generally perpendicular to this median plane.

Note that according to Figure 35, the means 100, the sections 20, 22 and the means 150 have come from material, if necessary from material, from preferably from extrusion, with walls 16, 18. More precisely again it will be noted that the sections of these walls comprised between the means sealing 100 and the support means 150 are thicker than the sheets 16, 18 making up the rest and most of the sachets. So the sections above have a certain rigidity between the means 100 and the means 150.

Those skilled in the art will understand that thanks to the characteristics mentioned above, when the elements 152, 154 are in support and the cursor 50 exerts a stress on the aforementioned sections of the walls 16, 18, located between the means 100 and 150, the sealing means 100 are stressed themselves in their maximum contact and sealing position.

FIG. 36 illustrates the biasing means provided on the slider 50, in the form of bosses 520, 540 provided on the internal surface wings 52, 54, in line with the closure profiles 20, 22. This is here bosses formed by cylindrical caps, but the invention is not limited to this particular geometry.

In FIG. 36, the effort exerted by the cursor 50 on F1 has been referenced. the mouth sections of the bag walls, F2 the reaction due to means 150 and F3 the force then exerted on the sealing means 100.

Note also that according to Figure 36 the aforementioned sections define at the mouth of the bag a cross-section cage rectangular which projects from the main walls 16 and 18 of the bag. In other words, the main walls of the bag are not coplanar with the external surfaces of these sections, but set back inward, relative to them, of a value "d". It is thus defined on the walls 16 and 18 of the bag a recess which serves to support the returns 53 and 55 provided on the wings 52 and 54 of the cursor 50, to avoid a untimely withdrawal of it.

Is illustrated in Figure 37, a variant according to which such dropout is deleted. Thus according to Figure 37, on the contrary, the walls principal of the sachet are coplanar, at rest, of the external surfaces of the sections located between the means 100 and 150. However, such a variant can also cooperate with a slider 50 equipped with returns 53, 55, on its wings 52, 54 thanks to the authorized deformation of the sheets 16, 18.

According to the variant illustrated in FIG. 38, the aforementioned sections, between the means 100 and 150, define at the mouth of the sachet not a rectangular cross section cage, but a cage globally rounded.

According to Figures 35 to 38 previously described, the elements support 152, 154 are symmetrical and contact each other in the median plane of the bag. Alternatively, however, these elements 152, 154 may be asymmetrical and thus contact each other outside the median plane. So we have illustrated in FIG. 39, a variant according to which only the wall 18 is provided with a support element 154 projecting from its internal face. This element 154 is adapted to come to rest on the internal face of the opposite wall 16.

According to Figures 35 to 39 previously described, the means sealing 100, the closing profiles 20, 22 and the support means 150 came from material, if any material, preferably from extrusion, on the walls 16, 18. As a variant, these different means may have come on respective support sails, by example thermally welded or glued to the inner sides of the sheets 16, 18. These can be respective and separate support sails for each means 100, profiles 20, 22 and means 150, or even sails supports common to several of these means. We have for example illustrated in FIG. 40 an alternative embodiment according to which the means 100, the closure sections 20, 22 and the support means 150 are carried by two respective sails, one attached to the internal face of the sheet 16, and reported the other on the internal face of the sheet 18.

Illustrated in FIG. 41 is an alternative embodiment according to which the biasing means are formed not of bosses integral with the inner face of the wings of the cursor, but of bosses 15 projecting from the external face of the wall sections situated between the means 100 and 150, of in preference to the closure profiles 20, 22. According to yet another variant it is thus possible to provide bosses both on the cursor and on the walls of the bag.

Another variant embodiment according to FIG. 42 has been illustrated. which the opposite ends of the elements 152 and 154 forming means are widened, to guarantee their support and prevent these elements, by offset do not find themselves adjacent, in which case the arm of expected lever to exercise the solicitation on the means 100 would not got. According to FIG. 42, the adjacent ends of the elements 152 and 154 have a generally triangular cross section with a base located in the contact plane. However, the invention is not limited to this special provision.

A variant has been illustrated in FIG. 43 according to which the cursor 50 is fitted on the inner face of its wings 52, 54 with projecting structures 522, 542 of complementary cross section of grooves 13 formed in the aforementioned bosses 15, the structures 522 and 542 being engaged in these grooves 13. More precisely still, the structures 522, 542 are flared, while the grooves 13 have converging edges. Thanks to that provision is avoided an untimely withdrawal of the cursor 50.

Another variant embodiment according to FIG. 44 has been illustrated. which means of complementing forms between the cursor 50 and the walls of the bag, at the returns 53, 55 formed on the wings 52, 54, in the form of elements 530, 550 as described previously.

Where appropriate, the elements making up the sealing means 100 can be coextruded with the bag and / or the closure profiles, a more flexible material than the material forming the latter. We can by example consider coextruding the lips 170, 172 into a copolymer of ethylene or a synthetic elastomer.

As indicated above, of course, this invention is not limited to the particular embodiments which come to be described, but extends to all variants according to its spirit.

By "sealing" means in the context of the present invention that the means 100 are adapted (according to their geometry and / or their strength support) or to ensure a complete barrier preventing any penetration from the outside to the inside of the bag and any leakage from the inside to the outside of the bag, either to ensure at least one barrier in one direction, ie to prohibit penetration from the outside towards the inside of the bag, or prohibit a leak from the inside to the outside of the bag.

It will also be noted that the return means 53, 55 and the structures such as 522 and 542, provided on the bag and which participate in the keeping the cursor 50 on the sachet, are generally not alone in ensure this maintenance, but for example complete in this function flared means provided on the central sole of the cursor 50.

Those skilled in the art will also understand that in the context of embodiments illustrated in FIGS. 35 to 44, the means sealing 100 may not be placed opposite the sides 52, 54, of the cursor, but outside of it. In other words, in this case, the end of the cursor is located between these means 100 and the profiles of closing 20, 22.

Claims (87)

Bag with two generally parallel sheets (16, 18) forming the main walls of the bag, closure profiles complementary (20, 22) fixed respectively on these sheets (16, 18) to the level of the mouth of the bag and a slider (50) comprising two wings side (52, 54) interconnected at a base (56), placed on the outside of the sheets (16, 18) at the mouth of the bag and which define with an elongated central sole (59), two corridors (590, 592) converging passage for closing profiles complementary (20, 22), characterized in that the sole (59) is interrupted back from the longitudinal end of the cursor (50), in particular on the widest side of the cursor corresponding to the side diverge from the passageways (590, 592), and that the lateral wings (52, 54) are provided near their free edge opposite the base (56), with means (520, 540; 100) for urging the sheets (16, 18) of the sachet into approximation, covering the entire longitudinal extent of the sole (59) and extending beyond longitudinally on either side thereof, for seal the bag in its closed position. Bag according to claim 1, characterized in that the biasing means are composed of projecting ribs (520, 540) towards the inside of the cursor (50), at the edge of the opposite wings (52, 54) at the base (56), or over part of the height of the internal surface of these wings (52, 54) between the free edge of the wings (52, 54) and the base (56). Bag according to claim 2, characterized in that the ribs (520, 540) are located below the sole (59), not up to it. Bag according to one of claims 2 or 3, characterized by causes the ribs (520, 540) to extend over the entire length of the slider (50), while the sole (59) is interrupted, at its end the widest, at a distance (I1) from the end of the cursor (50). Bag according to one of claims 1 to 4, characterized in that that the sole (59) is also interrupted at its end the thinnest (converging side of the corridors (590, 592), at a distance (I2) of the end of the cursor (50). Bag according to one of claims 2 to 5, characterized in that that the width (I6) of the free space defined between the tops of the ribs (520, 540) is substantially equal to the sum of the thicknesses of the sheets (16, 18), at the mouth of the sachets. Bag according to one of claims 2 to 6, characterized in that that the cursor includes two symmetrical ribs (520, 540) and likewise height, one on each of the wings (52, 54). Bag according to one of claims 2 to 6, characterized in that that the cursor (50) comprises asymmetrical ribs (520, 540), or a single rib on one of the wings (52, 54) of the cursor (50). Bag according to one of claims 1 to 8, characterized in that that the distance (I1) separating the wide end of the sole (59) and the end of the slider is between 1mm and 10mm and preferably around 3mm. Bag according to one of claims 1 to 9, characterized by the distance (I2) between the fine end of the sole (59) and the end of the slider is between 0.5mm and 10mm, and is very preferably around 4mm. Bag according to one of Claims 1 to 10, characterized by the fact that the height (I3) of the sole (59) is between 2mm and 7mm, and is preferably around 3mm. Bag according to one of claims 1 to 11, characterized by the distance (I4) between the top of the sole (59) and the biasing means (520, 540) is between 5mm and 15mm, and is very preferably of the order of 8mm. Bag according to one of claims 1 to 12, characterized by the thickness (I5) of the sole (59) at its wide end is between 0.3mm and 2mm, and is preferably of the order of 0.5mm. Bag according to one of claims 1 to 13, characterized by fact that the width (I6) of the opening made between the means of stress (520, 540) is between 50µm and 2.5mm, and is very preferably of the order of 200 μm. Bag according to one of claims 1 to 14, characterized by fact that the ratio (I1 / I5) between the distance (I1) separating the wide end of the sole (59) and the end of the slider and the thickness (I5) of the sole (59) at its wide end is preferably between 0.5 and 30, and is very preferably of the order of 6. Bag according to one of claims 1 to 15, characterized by the fact that the ratio (I2 / I5) between the distance (I2) separating the fine end of the sole (59) and the end of the slider and the thickness (I5) of the sole (59) to its wide end is preferably between 2.5 and 30, and is very preferably around 8. Bag according to one of claims 1 to 16, characterized by the fact that the ratio (I1 / I3) between the distance (I1) separating the wide end of the sole (59) and the end of the slider and the height (I3) of the sole (59) is preferably between 0.5 and 5, and is very preferably of the order of 1. Bag according to one of claims 1 to 17, characterized by the fact that the ratio (I2 / I3) between the distance (I2) separating the fine end of the sole (59) and the end of the slider and the height (I3) of the sole (59) is preferably between 0.1 and 5, and is very preferably of around 1.3. Bag according to one of claims 1 to 18, characterized by fact that the ratio (I1 / I4) between the distance (I1) separating the wide end of the sole (59) and the end of the slider and the distance (I4) separating the top of the sole (59) and the biasing means (520, 540) is preferably between 0.05 and 2, and is very preferably of the order 0.4. Bag according to one of Claims 1 to 19, characterized by the fact that the ratio (I2 / I4) between the distance (I2) separating the fine end of the sole (59) and the end of the slider and the distance (I4) between the top of the sole (59) and the biasing means (520, 540) is preferably between 0.05 and 2, and is very preferably of the order 0.5. Bag according to one of claims 1 to 20, characterized by that it further comprises, parallel to the closure profiles (20, 22), between said sheets (16, 18) and at the mouth (12) of the sachet, additional relief means (100) designed to ensure sealing by forming a barrier between the sheets (16, 18), in the position of closing the bag, said additional raised means (100) being adapted to be biased towards their sealing position by the slider (50) when the cursor is moved to the closed position of the bag. Bag according to claim 21, characterized in that the additional raised means ensuring sealing (100) are composed at least one bead (102; 104, 106) secured to the internal surface a sheet (16) of the sachet. Bag according to one of claims 21 or 22, characterized by the fact that the additional raised means ensuring the seal (100) are composed of two beads (104, 106) secured respectively to the internal surface of the two sheets (16, 18) of the sachet. Bag according to claim 21, characterized in that the additional raised means ensuring sealing (100) are composed complementary male / female elements (110, 112) integral respectively from the internal surface of the two sheets (16, 18) of the sachet. Bag according to claim 24, characterized in that the male element (110) has a substantially triangular section. Bag according to one of claims 24 or 25, characterized by the fact that the two lips (1120 and 1122) of the female element (112) are asymmetrical. Bag according to one of claims 24 to 26, characterized by the fact that the lip (1120) of the female element (112) located towards the inside of the bag with respect to the male element (110) is longer and more flexible than the second lip (1122) located towards the outside of the bag. Bag according to one of claims 21 to 27, characterized by the fact that the additional raised means ensuring the seal (100) are arranged on the inside of the closure profiles (20, 22). Bag according to one of claims 21 to 28, characterized by the fact that the additional raised means ensuring the seal (100) extend over the entire length of the bags. Bag according to one of claims 21 to 29, characterized by the fact that the geometry of the profiles (20, 22), additional means (100) and of the cursor (50) is such that the sides (52, 54) of the cursor (50) impose to the means (100), a transverse play less than that tolerated for the profiles closing (20, 22). Bag according to one of claims 21 to 30, characterized by the fact that the internal surfaces of the sides (52, 54) of the cursor (50) are parallel and the thickness (L1) of the means (100) is greater than that (L2) defined by the closure profiles (20, 22) when these are engaged. Bag according to one of claims 21 to 31, characterized by the fact that the cursor (50) has on the internal surface of its flanks (52, 54) bosses (520, 540) placed opposite the means (100) for guarantee that the latter are stressed in the sealing position when bag closure. Bag according to one of claims 21 to 32, characterized by the fact that the walls of the bag have bosses placed opposite means (100) and facing the sides of the slider (50) to guarantee the biasing of the means (100) in the sealing position, when closing from the sachet. Bag according to one of claims 21 to 33, characterized by the fact that it includes on the one hand notches (160, 180) which open out on the external surface of the bag, respectively opposite the means (100), and on the other hand ribs (522 and 542) projecting from the surface internal of the sides (52 and 54) of the cursor (50), which ribs (522 and 542) are adapted to penetrate respectively into said notches (160 and 180). Bag according to one of claims 21 to 34, characterized by fact that it includes means (19, 24) which form an anti-violation veil or opening indicator at the mouth (12). Bag according to claim 35, characterized in that the anti-violation veil (24) is formed by a bellows folded towards the inside of the bag, at the mouth (12) in the continuity of support sails (121, 21 and 123, 23) closing profiles or additional means sealing. Bag according to claim 35, characterized in that the anti-violation veil (19) is formed by a bellows folded inwards from the bag, at the mouth (12) in the continuity of the film composing the sachet. Bag according to one of claims 21 to 37, characterized by the fact that the bag (10) is formed from a single film folded over it even at the bottom (14) of the bag. Bag according to one of claims 21 to 37, characterized by the fact that the bag (10) is formed from a single film folded over it even at the mouth (12) of the bag. Bag according to one of claims 21 to 37, characterized by the fact that the bag (10) is formed from two sheets (16, 18) initially separated and superimposed during manufacture. Bag according to one of claims 21 to 40, characterized by the fact that the complementary closure profiles (20, 22) and / or the additional sealing means (100) have come from extrusion on the sheets (16, 18) composing the sachet. Bag according to one of claims 21 to 40, characterized by the fact that the complementary closure profiles (20, 22) and / or the additional sealing means (100) are initially formed on respective support webs (21, 23; 121, 123) attached to the sheets (16, 18), at the mouth (12) of the bag. Bag according to one of claims 21 to 40 and 42, characterized by the fact that the complementary closure profiles (20, 22) and the additional sealing means (100) are initially formed on common support sails (21, 23; 121, 123) attached to the sheets (16, 18), at the mouth (12) of the bag. Bag according to one of claims 21 to 43, characterized by that the closure profiles (20, 22) are adapted to ensure automatically a transverse stress (P) on the means (100) when the bag is closed. Bag according to one of claims 21 to 44, characterized by the fact that the complementary closure profiles (20, 22) are of the type male / female and that they include at least one male or female profile asymmetrical. Bag according to claim 45, characterized in that the height or size (L3) of the element (220) defining the lip internal of the female profile (22) is less than the height or bulk (L4) of the element (222) defining the external lip of the female profile (22). Bag according to one of claims 21 to 44, characterized by the fact that the complementary closure profiles (20, 22) are of the type hook and they have at least two pairs of hooks complementary defining widths in assembled position, different from one pair of hooks to another. Bag according to claim 47, characterized in that the two additional hooks (C1, C2) located towards the inside of the bag define in the assembled position a width (L5) between the internal faces sheets (16, 18) less than the width L6 taken between the same faces sheets (16, 18) at the pair of complementary hooks (C3, C4) located towards the outside of the bag. Bag according to one of claims 21 to 48, characterized by fact that the additional raised means ensuring the seal (100) are composed of two elements (104, 106) respectively attached to the internal surface of the two sheets (16, 18) of the bag and intended to come in support from their top. Bag according to one of claims 21 to 48, characterized by fact that the additional raised means ensuring the seal (100) are composed of two elements (104, 106) respectively attached to the inner surface of the two sheets (16, 18) of the bag and intended to be juxtaposed and come to rest at their adjacent flanks facing (103, 105) generally perpendicular to the sheets (16 and 18). Bag according to one of claims 21 to 48, characterized by the cursor (50) is provided on the ends with at least one of its lateral wings (52, 54), of a return (53, 55) directed towards the interior of the bag and positioned to be located beyond the sealing means (100). Bag according to claim 51, characterized in that the cursor (50) is further provided at the end of this return (53, 55) an additional wing (530, 550) directed towards the base (56) of the cursor (50), that is to say towards the outside of the sachet. Bag according to one of claims 21 to 52, characterized by the causes the portions of support films (16, 18) located opposite the profiles closure (20, 22) and sealing means (100) have a thickness greater than the thickness of the rest of the film making up the sachet. Bag according to claim 53, characterized in that the localized excess thickness of the films (16, 18) is obtained in the form of a extra thickness formed when the film is extruded. Bag according to claim 53, characterized in that the localized excess thickness of the films (16, 18) results from the fixing of webs supports for the closure profiles (20, 22) or means (100). Bag according to one of claims 23 and 49, characterized by the fact that the two elements (104, 106) respectively attached to the internal surface of the sheets (16, 18) are provided at the top with at least a respective wing (1040, 1060) orthogonal audits elements. Bag according to one of claims 23 and 50, characterized by causes at least one of the two elements (104, 106) provided on the sheets supports, is provided at its top with an orthogonal wing (1060) intended to come to rest against the internal face of the sheet (16) opposite. Bag according to one of claims 23 and 50, characterized by causes at least one of the two elements (104, 106) provided on the sheets supports, has a rounded protrusion (1042, 1062). Bag according to claim 52, characterized in that the cursor (50) is further provided at the end of this return (53, 55) a boss (532) directed towards the base (56) to urge the two juxtaposed elements (104, 106) in support by means of their sides adjacent (103, 105). Bag according to one of claims 21 to 59, characterized by causes the portions of support films (16, 18) carrying the profiles of closure (20, 22) and the sealing means (100) are not located in the direct extension of the leaves composing the horn of the sachet, but are shifted towards the outside of the bag at the respective recesses (1600, 1800). Bag according to claim 60, characterized in that one recesses (1800) is itself provided with an extension (1802) directed towards the opposite support sheet (16). Bag according to one of claims 23 and 50, characterized by the fact that at least one of the two elements (104 or 106) has a increasing thickness towards its apex or has a flank tilted so that it exerts a force on the other element (106 or 104) juxtaposed, in the closed position of the bag. Bag according to one of claims 21 to 62, characterized by the sealing means (100) include flexible structures and elastic, to be deformable when closing the bag. Bag according to one of claims 21 to 63, characterized by the that the sealing means (100) comprise at least one lip curved, flexible and elastic (130) integral with the sheet (18) carrying one closure profiles (22). Bag according to claim 64, characterized in that the lip (130) is formed by a cylinder sector whose angle at the center is greater than 180 °. Bag according to one of claims 64 or 65, characterized by the fact that in the open state of the bag, said lip (130) extends beyond the associated closure profile (22) so that in the closed state of the bag, said lip (130) exerts pressure on the opposite sheet (16). Bag according to one of claims 64 to 66, characterized by that the location of the lip (130) and the geometry of this lip (130) are such that said lip (130), when it rests on the sheet (16) opposite, receives a reaction which requests it itself in support against one closing profiles. Bag according to claim 67, characterized in that the biasing of the lip (130) bearing against the female closing element (22) is reinforced by the presence on the internal surface of the sides (52, 54) of the boss slider (50) (520, 540). Bag according to claim 68, characterized in that the bosses (520, 540) converge towards the upper base (56) of the slider (50) near the end of the cursor (50) located on the opening side from the sachet. Bag according to one of claims 21 to 69, characterized by the each of the two sheets (16, 18) is provided on its internal surface an elastic lip (130) in the cylinder sector designed to come into support by their top when closing the bag. Bag according to one of claims 21 to 69, characterized by the each of the two sheets (16, 18) is provided on its internal surface an elastic lip (130) in the cylinder sector designed to be juxtaposed laterally. Bag according to one of claims 21 to 71, characterized by the fact that it comprises on its mouth (12), means (150) located at the opposite of said additional sealing means (100), with respect to closure profiles (20, 22), and adapted to define a support between the opposite internal faces of the walls of the bag, and it is provided on the slider (50) means (520, 540) capable of urging the walls of the bag, towards inside, in an area of these walls between the means additional sealing (100) and the support means (150). Bag according to claim 72, characterized in that the stress is applied to the right of the closure profiles (20, 22). Bag according to one of claims 72 or 73, characterized by the fact that the additional sealing means (100) are located on the interior of the closure profiles (20, 22), while the means (150) defining the support are located on the outside of the closure profiles (20, 22). Bag according to one of claims 72 to 74, characterized by the fact that the additional sealing means (100) are formed by two flexible and elastic lips (170, 172). Bag according to one of claims 72 to 75, characterized by the fact that the support means (150) are formed of two elements (152, 154), integral respectively with the internal faces of the walls (16, 18), at the level from the mouth of the bag. Bag according to claim 76, characterized in that these elements (152, 154) are in mutual support, in the closed position of the bag, in the middle plane of it. Bag according to claim 76, characterized in that these elements (152, 154) are in mutual support, in the closed position of the bag, in outside the median plane of it. Bag according to one of claims 72 to 78, characterized by fact that the support means (150) have come from material, if necessary from materials, preferably from extrusion, with the walls (16, 18) of the bag. Bag according to one of claims 72 to 78, characterized by fact that the support means (150) have come from material, if necessary from materials, preferably from extrusion, on attached support webs, for example by welding or gluing, on the walls (16, 18) of the bag. Bag according to one of claims 72 to 80, characterized by causes the sections of the walls between the sealing means (100) and the support means (150) are thicker than the sheets (16, 18) making up the rest and most of the sachets. Bag according to one of claims 72 to 81, characterized by causes the biasing means to include bosses (520, 540) on the inner surface of the wings (52, 54) of the cursor (50). Bag according to one of claims 72 to 82, characterized by fact that the biasing means include bosses on the walls of the bag. Bag according to one of claims 82 or 83, characterized by the fact that the bosses (520, 540) are provided in line with the profiles of closure (20, 22). Bag according to one of claims 72 to 84, characterized by causes the opposite ends of the elements (152, 154) forming means supports are widened, for example of cross section generally triangular. Bag according to one of Claims 21 to 85, characterized by the the fact that the elements making up the sealing means (100) are coextruded with the bag and / or the closure profiles, in a material softer than the material forming the latter, for example in a ethylene copolymer or a synthetic elastomer. Bag according to one of claims 21 to 86, characterized by the fact that said additional relief means are placed opposite the sides of the cursor.

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