US20150353218A1

US20150353218A1 - Method for producing bags

Info

Publication number: US20150353218A1
Application number: US14/759,772
Authority: US
Inventors: Uwe Köhn; Rainer Henze; Rüdiger GROBE-HEIMEYER; Thomas Hawighorst; hans-Ludwig VOB
Original assignee: Windmoeller and Hoelscher KG
Current assignee: Windmoeller and Hoelscher KG
Priority date: 2013-01-08
Filing date: 2013-08-16
Publication date: 2015-12-10
Also published as: EP2943408A1; WO2014108221A1; BR112015016290A2; DE102013100131A1; CN105073583A

Abstract

The invention relates to a method for the producing bags (10), comprising the following steps: a tubular material (100) comprising a coating material (110) and at least one reinforcement material (120) for mechanically reinforcing the coating material (110) is provided and a base section (20) of a bag (10) is formed. The invention is characterized in that a folding section (102) of the tubular material (100) is folded about at least 180° on a connecting section (104) of the tubular material (100) for forming the base section (20), and the folded folding section (102) is connected to the connecting section (104).

Description

The present invention relates to a method for producing bags, a production device for the production of bags and a correspondingly produced bag.
Methods for the production of bags are basically known. They are provided, for example, to produce bags as packaging material for packaging items. Thus, it is known to provide so-called form-fill-seal methods in order to preferably have one machine being able to produce the bag, to fill the bag and to close the bag.
Known methods are used in order to, for example, perform the single method steps from a plastic material in form of a tubular material. Particularly, concerning the sealing of the tubular material for the configuration of a base section and a sealing section a sealing technology is used frequently.
Therefore, the material of the tubular material is heated until a temperature above the melting temperature has reached this material. Subsequently, or at the same time, the melted areas are brought in contact to one another so that a melting, the so-called sealing, of the materials is performed. Therewith, a tight closure at the upper side or the lower side of the tubular section is possible and therewith, a configuration of a base section or a sealing section for the bag.
Disadvantage of these known methods is that it is restricted to simple packaging materials. If, however, an increased requirement is requested for the packaging material, particularly concerning the mechanical strength, thus known methods are often not able to manufacture such materials. This applies particularly for multilayered materials, which comprise a reinforcement material, for example in form of a tissue. With such embodiments of the material a known application of a sealing technology would possibly lead to a merging of the reinforcement material and therewith to a reduction of the mechanic stability of the reinforcing material. Waiving such reinforcement material, however, does not allow the partly necessary high strength values or the high mechanic stabilities of such a bag.
It is the objective of the present invention to at least partially avoid the previously described disadvantages of known methods. Particularly, it is the objective of the present invention to provide a method for producing bags, a production device for the production of bags and a correspondingly produced bag, which enables the production in a cost-efficient and simple manner with high mechanic strength of the bag and the configuration of the base at the same time.
The previous objective is solved by a method with the features of claim 1, a production device with the features of claim 8 and a bag with the features of claim 13. Further features and details of the invention result from the dependent claims, the description and the drawings. Thereby, features and details, which are described in relation with the method according to the invention, apply naturally also in connection with the production device according to the invention or the bag according to the invention and vice versa, so that according to the disclosure of the individual aspects of the invention it can always be related to reciprocally.
The present invention relates to a method for producing bags, which comprises the following steps:

- providing of a tubular material, comprising a coating material and at least an reinforcing material for mechanically strengthen the coating material,
- configuration of a base section of the bag.

A method according to the invention is characterized in that for the configuration of the base section the following steps are performed:

- a folding section of the tubular material is turned to a connecting section of the tubular material about at least 180°, and
- the turned tubular section is connected to the connecting section.

A method according to the invention is based on the fact that a combined material is used as a tubular material. This tubular material comprises a reinforcement material, which can, for example be configured in form of a tissue structure. Thus, the tissue structure can provide the necessary strength, while the coating material provides further functionalities, particularly concerning the sealing of the tubular material. The sealing by the coating material, particularly relates to a liquid tightness or a gas tightness, particularly concerning an air tightness.
With the method according to the invention the base section can be produced in a cost-efficient and simple manner, despite the complex combined tubular material from coating material and reinforcing material. During turning of the tubular material a folding section and a connecting section of the tubular material is defined automatically by the configuration of the fold. If the fold edge of the tubular material is determined, the moving section of the tubular material will be defined as the folding section, while the connecting section of the tubular material normally stays in a position, onto which the folding section is turned. By folding the thickness of the tubular material is doubled at this point, so that with tubular material the laid on top of each other in the area of the folding section and connecting section laid on top of each other in total four layers are laying on top of one another. Since the tubular material comprises an inner side and an outer side by the outer turning of the folding section to the connecting section, the outside of the folding section is laid on top of the outside of the connecting section. According to the invention, the connection between the turned folding section and the connecting section can be configured randomly. By folding it is ensured that not the reinforcing material but only the coating material of the tubular material can be connected to itself. Therewith, it is ensured that depending on the manner of the subsequent connection between the folding section and the connecting section an impairment of the reinforcing material is omitted, particularly concerning the strength of the reinforcing material.
Concerning the method according to the invention it is irrelevant, if this base section is produced individually or separately or if the method is configured together with other steps within a single machine. Therewith, it is naturally possible that the configuration of the base section represents a partial step of the whole method in a form-fill-seal machine. Thus, it is possible that the tubular material is produced in a single step, for example, using an extrusion machine. Likewise, the combination between the reinforcing material, for example in form of a tissue and the subsequent coating, can be part of such a machine or part of such a method according to the invention. Likewise, it is irrelevant, if a cutting of the tubular material for configuration of the exact length of the bag occurs before or after the configuration of the base section. Thus, the base section for turning of the folding section of the tubular material can occur at the open edge of the tubular material and also at a recently cut lower edge of the bag of the tubular material. Naturally, it is also possible, that the folding section in form of a Z-folding can occur at the not yet cut lower edge, namely at any position within the tubular material.
Preferably, the coating material is located at the outer side of the tubular material, while the reinforcing material is assembled at the inner side of the tubular material. It can, for example, be provided by the fact that a reinforcing material, particularly in form of a mesh, is coated at the outside with the coating material. As coating material, for example a plastic, particularly a
PE-plastic is used. As reinforcing material, for example also a plastic, particularly a stretched plastic can be used. Longitudinal and/or transverse stretched plastics are possible as reinforcing materials, which provide the desired mechanical strengthening of the coating material particularly in form of a tissue.
According to the manner of the subsequent connection of the turned folding section with the connecting section it can be reasonable, if the melting temperature of the coating material and of the reinforcing material is clearly distinguishable from one another. If, for example for the connection of the folding section with the connecting section a melting of the coating material is performed, it is of great advantage, when the coating material comprises a significantly lower melting temperature as the reinforcing material. Particularly, the melting temperature of the coating material is differentiated from the melting temperature of the reinforcing material about more than 20° C.
A method according to the invention can be improved in a way that the folding section is at least turned twice. Particularly, the folding section is at least turned twice in a way that the folding is at least partially turned to itself. In other words, so to say a coiling of the folding section occurs so that a multilayer results on the connecting section. In this manner the folding section obtains at least two folding locations, which can also be configured as kink points of the material of the folding section. By this increase of the amount of kink points or folding positions the tightness of the base section produced by the folding is increased. Each folding position increases the density against the penetration of piece goods. In a particularly preferable embodiment in this manner also a tightness against free-flowing and flowing-capable goods can be provided. Therewith, a produced bag according to the invention can also be used with high packaging requirements as exist, for example with final consumer packaging. This can, for example involve the packaging of animal products like pet food or animal accessories. By increasing the tightness particularly additional steps or additional sealing agents can be omitted. Thus, with the doubled folding section, for example, a use of additional sealing tapes can be omitted. In this manner the application universally of a bag according to the invention is significantly increased. At the same time the effort of the production is reduced since no additional step for the increase of the sealing is necessary. Rather, a modification of the already existing folding section has to be performed exclusively so that a constructive application in one machine can be performed in a simple and cost-efficient manner.
Likewise, it can be an advantage when with the method according to the invention the folding section is at least partially turned about at least 360°. Thereby, the folding section is preferably at least partially turned to itself like already described in the previous paragraph. Thereby, such an embodiment also comprises the advantages of an increased tightness of the base section provided in this manner like they are described in the previous paragraph. The turn about at least 360° can thereby be performed coiling-like so that folding positions are not yet configured during the turning. These are only generated, when the coiled folding section is laid flat and therewith, the single sections of the folding section are lying on top of one another. This embodiment of the method particularly leads to an increased fastness, since the coiling requires less effort concerning the direction of the movement as it is the case with an aimed folding movement.
A method according to the invention can be further improved in a way that the connection of the turned folding section with the connecting section is performed through at least one of the following method steps:

- hot air fan
- sealing
- sewing
- gluing

The previously list is a non-exhaustive list of possible connecting methods, which can be used individually and/or in any combination with one another. Thereby, different possibilities of connecting techniques are used. If, for example gluing is performed, a desired connection of the folding section and the connecting section can be generated independent from the use of the temperature. Preferably, independent from the chosen method the connection can be performed in a way that a tight connection between the folding section and the connecting section allows a complete sealing of the base section of the bag. If sewing is used as the connecting method, likewise a temperature influence of the folding section and the connecting section can be omitted. By the use of sewing or gluing methods a free choice of materials for the reinforcing material and for the coating material can occur. If a temperature influence is desired, a sealing method can be used for example in a classic manner. Via the contact of sealing jaws with the tubular material, particularly with the coating material, thereby the desired temperature input into the tubular material will occur in order to achieve a materially bonded connection during the configuration of the base by melting and subsequent cooling after turning of the coating material. Naturally, it is also possible that a hot air fan is used in order to perform the temperature transfer to the coating material. Likewise, other heating transfer possibilities, for example in form of heat radiation, are possible within the scope of the present invention.
Concerning a particularly high transfer rate during the performance of a method according to the invention it is an advantage, when the connecting step for the connecting method can be performed with a high speed. Thus, it is important that with gluing and also with sealing or by the use of a hot air fan a rapid configuration of the desired connection occurs so that rapid cycle times are possible during the use of the method in a machine.
Another advantage is achieved, when with the method according to the invention for the connection of the turned folding section with the connecting section at least partially a connecting material is used, which can particularly be activated by energy supply. With this additional connecting material particularly an adhesive is involved. This adhesive can be part of a separate coating or even part of the coating material itself. Likewise, an additional supply of separate connecting material as a separate adhesive is possible within the scope of the present invention. Thus, in dependence of the configuration of the connecting material the connecting material can be assembled at the desired position either before or during folding. It is further possible that the connecting material is completely assembled on the folding section and/or completely on the connecting section and also at least partially on one or both of these sections. Naturally, also already during the generation of the tubular material this additional connecting material can be provided, for example in form of an additional printing ink. With a particular embodiment it is possible that with the connecting material an activatable connecting material is involved. Thereby, for example an activation by energy supply in form of pressure and/or temperature is possible. Thus, as an additional connecting material, for example a cold-seal adhesive can be used, which can be activated by pressure. Likewise, a so-called hot melt, namely an adhesive which can be activated by temperature, is possible within the scope of the present invention. Naturally, the connecting material itself can likewise comprise a substrate, so that it can be used in form of an adhesive tape or a double-sided adhesive tape. The assembly occurs preferably on the folding section and/or on the connecting section so that the connecting material is assembled between the folding section and the connecting section of the tubular material after turning of the connecting section.
According to the invention it can be likewise an advantage, when with a method the turning of the folding section occurs about a folding axis, which is aligned transverse or mainly transverse to the longitudinal direction of the tubular material, particularly to the conveying direction of the tubular material. This means that the tubular material comprises a longitudinal direction, which corresponds to the rotation axis or the cylinder axis as a longitudinal axis of the tubular material with an aligned tubular material. Possibly, a conveyance of the tubular material occurs in this longitudinal axis direction or in longitudinal directions, so that the longitudinal direction also corresponds to the transport direction of the tubular material. The folding section occurs preferably transverse, particularly perpendicular, to such a longitudinal direction, so that this direction can also be called transverse direction. Normally, the extension of a bag in this transverse direction is smaller than in a longitudinal direction of the tubular material, so that the effort for the generation of the base section can be reduced to the small geometric extension namely in transverse direction. By the alignment of the folding axis transverse or mainly transverse to the longitudinal direction further a continuity of the production process of the tubular material is considered. Thus, this alignment enables that a method according to the invention can be used in a continuous or a semi-continuous process of an overall process, particularly in a form-fill-seal method.
Another advantage is achieved in a way that with the method according to the invention the connection between the turned folding section and the connecting section occurs only sectionally over the entire extension of the tubular material in the direction of the folding axis.
Particularly, in edge sections of the tubular material a sufficient sealing can already be achieved by turning of the folding section. Naturally, it is also possible that the folding section provides single sections for the connection between the folding section and the connecting section in form of a dashed line, a dash-dotted line or a dotted line, so that the effort and the material amount for connecting the turned folding section with the connecting section can be reduced. At the same time, the mechanic stability is increased by turning.
A method according to the invention can advantageously be improved in a way that the turned folding section is connected with the connecting section by at least a connecting element. A separate connecting element is thereby particularly distinguished from a connecting material, for example in form of an adhesive. Thus, such a connecting element can be configured, for example in form of a separate clamp or in form of an applied cover sheet. If a folding axis is aligned for example transverse or mainly transverse to the longitudinal direction after turning of the folding section to the connecting section, this folding area of the tubular material can be fixed in the folded position via such a coversheet or an additional glue element as a connecting element. Preferably, mainly the whole opened turned area of the tubular material is sealed, so that independent from folding about the folding axis the tightness of the interior of the bag is ensured. Naturally, the separate connecting element can be fixed in diverse manners. Thus, it is possible to perform a glue step, a seal step or a sew step as one or multiple possibilities of this fixing step.
According to the invention it is likewise an advantage, when with the method according to the invention additionally at least one of the following steps is performed:

- cutting of the tubular material to the desired length of the bag,
- filling of the bag after configuration of the base section with packaging items,
- configuration of a sealing section for sealing the bag after filling of the bag, wherein the sealing section is configured particularly in the same or mainly the same manner as the base section.

According to the invention such a method is in total configured as a form-fill-seal method.
Thus, after provision of the tubular material this can be cut to the desired length of the bag. Thereby, the base section can be performed at the end position of the tubular material, thus before cutting and also after cutting on the other side of the tubular material. Naturally, it is also possible that the base section is performed in the section of the tubular material in the uncut state in form of a Z-folding. The filling of the bag occurs preferably after configuration of the base section, for example with a packing item. Subsequently, the sealing section for sealing the bag after the filling of the bag is performed, preferably by the same mechanic components of a corresponding production device. The sealing section is configured in the same or mainly manner like the base section, on basis of a reduced complexity and a reduced effort.
A method according to the invention can be improved in a way that the bag is picked from a transporting device after configuration of the base section and before cutting of the tubular material. At this point of time, namely before cutting of the tubular material, the bag is still in a uniquely defined position, since the bag is still connected with the tubular material. By cutting a shifting can come along with an alteration of the position of the bag. Therewith, it is ensured by picking of the bag before cutting that the bag is picked in the predefined position and orientation. A subsequent recognition of the possibly shifted position of the bag is therewith no longer necessary. Thus, the picking of the bag and the configuration of the base section can be performed at least partially at the same time. In this manner, the whole process can be accelerated additionally in a corresponding production device, particularly in form of a form-fill-seal machine. The transport device serves for the further transport of the bag to a collecting position or to a further processing station. This further processing station is particularly a filling device, in which the bag is filled with the packaging items. Concerning the term “bag” and “tubular material” it has to be pointed out that the bag is from tubular material. Therefore, at the point of time after configuration of the base section, the bag is already defined concerning its geometric extension. At the same time, the bag is still uncut and therewith still part of the tubular material.
Likewise, it is an advantage when with the method according to the invention after cutting of the tubular material the bag is transported from a transporting device to a filling device and is filled with the packaging items. Together the configuration of the base section (form), the filling with the packaging items (fill) and the subsequent sealing of the bag (seal) build a mainly self-contained form-fill-seal method, which can be performed fast and cost-efficient. The transport device can thereby hold the bag with the gripping device until the filling process directly after picking and therewith still before cutting the tubular material. Likewise, it is possible that a transfer of the picked bag occurs within the transporting device. This means that after cutting the tubular material, meaning after separation, the bag is transported away from the cutting device, is subsequently transferred to another gripping device and is finally supplied to the filling device with this further gripping device.
Likewise, a subject-matter of the present invention is a production device for the production of bags from tubular material, comprising a coating material and at least a reinforcing material for reinforcing the coating material. Thereby, the production device comprises a base device for the configuration of a base section of a bag. A production device according to the invention is characterized in that the base device is configured for a turning of a folding section of the tubular materials about at least 180° to a connecting section of the tubular material and the connection of the turned folding section with the connecting section. Particularly, a production device according to the invention is configured in a way that it is established for the performance of a method according to the invention. Therewith, a production device according to the invention has the same advantages like they are described in detail in relation to the method according to the invention. Naturally, for the configuration of the turning of the folding section to the connecting section, a relative movement of the tubular material towards one another with a stationary tube can be performed and also a movement of the tubular material with the stationary turning means of the production device of the base device. Thus, stationary and/or movable tools can be used for the performance of the turn of the folding section.
Basically, it is an advantage, when with the production device according to the invention the base device comprises for example a tongs device for turning of the folding section. Such a tongs device can comprise tongs for picking and moving of the folding section. These tongs of the tongs device are preferably movable relative towards the tube. These tongs device is an advantage, particularly when the folding of the folding section should be performed with a stationary tube. The tongs thereby perform a turning movement preferably about at least 180°.
Likewise, it can be an advantage, when with the production device according to the invention the base device comprises a guide device particularly with at least one guide plate for turning of the folding section. Such a guide device is preferably used when the turning of the folding section should be performed with moving tubular material. Thus, one or multiple guide plates can be intended, which involve a corresponding turning of the folding section to the connecting section during the movement of the tubular material along its longitudinal axis. The turning is thus forced by the form and geometric extension of the guide plate.
It is likewise an advantage when with the production device according to the invention the tubular material and/or the bag are conveyed by transport elements, which work reversing or circumferential. Thus, it is possible to provide the circumferential work of the transport elements, for example in form of a conveyor belt or by chain-like assembled tongs. Also lever mechanisms are possible, which enable a reversing transport of the tubular material and/or the bags, for example with accordingly assembled tongs.
With the production device according to the invention it is further possible that subsequent to the base device at least one transport device is assembled, which is configured for the picking and transporting of the bag after the configuration of the base section. Therewith, a production device according to the invention can achieve the same advantages like they are described in detail for the step of transporting for a method according to the invention. Particularly, with such an embodiment of the production device a picking of the bag can be performed in a predefined position and preferably the method can be accelerated by at least partially simultaneous working. The transport device preferably comprises moveable grippers for picking, for example in form of tongs or clamps. With these grippers, the bag is, for example, picked at its opening side and is subsequently transported to a further processing station. This can particularly involve a filling device for filling of the bag. The grippers are configured particularly moveable for the transport, for example along driven guidances. Therewith, a transport within the production device can occur to the subordinated processing stations.
Likewise, it is an advantage when with the production device according to the invention at least one cutting device is assembled for cutting of the tubular material after configuration of the base section. This process of cutting of the tubular material occurs particularly after gripping of the bag by a transport device. Therewith, a shifting of the position of the bag during the cutting does not lead to problems for gripping with the transport device. The cutting device can therefore comprise cuttings means, which are, for example configured in form of cutting blades. The advantages of such a cutting device are particularly the same, which are already described for the method according to the invention regarding the method step of cutting of the tubular material. Thereby, the step of cutting the tubular material serves particularly for the separation of the already produced bags by configuration of the base section. Thereby, the cutting occurs behind the configured base section related to the conveying direction of the tubular material. Therewith, the base section remains completely with the separated bag by cutting. The residual tubular material is thus opened at this edge and in this manner configures the upper opening of the subsequent bag.
Another advantage can be achieved when with the production device according to the invention a filling device is assembled subsequent to the cutting device and/or the transporting device for filling the bags with packaging items, wherein the production device is particularly configured as a form-fill-seal machine. Therewith, in one machine in form of the production device the complete producing process of the bag and also the filling and sealing process of the bag can be performed. This leads to reduced costs of the production device related to the whole process and a significantly decreased space requirement. The advantages like they are described in detail according to the method according to the invention particularly benefit also for the production device and therewith a complete form-fill-seal method.
A further subject-matter of the present invention is a bag from a tubular material comprising a coating material and at least a reinforcing material for reinforcing of the coating material. Thereby, the bag comprises a base section and a sealing section, which both close the interior of the bag. A bag according to the invention is characterized in that the base section and/or the sealing section comprise at least a folding section of the tubular material, which is turned on a connecting section of the tubular material about at least 180° and is connected to this connecting section. A bag according to the invention is preferably configured in a way that it is produced by a production device according to the invention and/or by a method according to the invention. Thereby, a bag according to the invention involves the same advantages like they are described in detail, related to the method according to the invention or related to a production device according to the invention.
It is likewise an advantage, when the bag comprises packaging items in its interior. Such packaging items can be piece goods and/or liquid goods, wherein the reinforcing material in combination with the coating material preferably provides a tight sealing of the interior of the bag.

The present invention is described in detail by means of the attached drawings. Thereby, the used terms “left”, “right”, “up” and “down” relate to an orientation of the drawings with normally readable reference sings. It is schematically shown:

FIG. 1 a first representation of a tubular material according to the invention,

FIG. 2 another representation of a tubular material according to the invention,

FIG. 3 a schematic representation of a tubular material according to the invention in cross section,

FIG. 4 a a first step of the method according to the invention,

FIG. 4 b a further step according to FIG. 4 a,

FIG. 4 c a further step according to FIG. 4 b,

FIG. 4 d a further step according to FIG. 4 c,

FIG. 5 a a step of another embodiment of a method according to the invention,

FIG. 5 b a further step of the method according to FIG. 5 a,

FIG. 5 c another step of the method according to FIG. 5 b,

FIG. 5 d a further step of the method according to FIG. 5 c, and

FIG. 6 an embodiment of a bag according to the invention.

FIGS. 1 and 2 show an embodiment of a tubular material 100. Thereby, a tubular material 100 is involved, which is, for example produced by a blow extrusion machine. It extends along a longitudinal direction L of the tubular material 100, wherein an open edge is available, which is in FIGS. 1 and 2, for example adjusted to the lower left in the direction of viewer. From the upper right the production device could be seen so that a producing direction and accordingly also a transport direction would be available along the longitudinal direction L to the lower left. The tubular material 100 is laid flat within the cause of the method, like schematically shown in FIG. 2.
FIG. 3 shows a possibility of filling of the tubular material 100 according to the invention. Such a reinforcing material 120 is intended in form of a tissue. The tissue is interconnected with one another and serves for providing a sufficient mechanic stability of the tubular material 100. Since this tissue-like configuration of the reinforcing material 120 prevents a tight closure of the interior of a bag 10, additionally a continuously applied coating in form of a coating material 110 is intended. This enables an air-tight sealing of an interior of a bag 10 from such a tubular material 100. FIG. 3 shows a schematic cross-section through the material, wherein according to FIGS. 1 and 2 each the upper side and also the lower side of such tubular material 100 is configured in a corresponding manner. Thereby, the coating material 110 is preferably intended circumferentially on the outer side of the tubular material 100.
FIGS. 4 a to 4 c show a first embodiment of a method according to the invention. Thus, starting from the left, a production occurs for the tubular material 100, for example by an extrusion method. This tubular material 100 is, for example configured in a way like it is shown in FIGS. 1 to 3. Now, a part of the tubular material 100 can be cut by a cutting device 84. At the cut portion, now a turning of the folding section 102 to a connecting section 104 occurs by a base device 82. Therewith, the base section 20 of the bag is configured like it is shown in FIG. 4 c. In order to fix this base section 20 in this turned position the base device 82 is configured according to FIG. 4 c, for example with a temperature influence possibility. Thus, a melting of the coating material 110 can occur, for example with the help of sealing jaws, with the help of heat radiation and/or with the help of hot air. Therewith, a material coherent connection of the folding section with the connecting section 104 can be provided, like it is schematically shown in FIG. 4 c. Naturally, also a possible application of an additional connecting material 30 can be intended. Thus, as a connecting material 30 an adhesive can be used particularly an adhesive, which can be activated by an energy supply. In this manner, a corresponding connection between the folding section 110 and the connecting section 104 can be achieved using hot melt or cold-seal adhesive.
FIG. 4 d shows an alternative embodiment, wherein here a thread is used as an additional connecting material 30, which enables a sewing of the turned folding section 102 for the connection with the connecting section 104. In order to ensure that also with the intention of a sewing steps as a connection between the folding section 102 and the connecting section 104 the desired tightness of the bag 10 at the base section 20 is ensured, with this embodiment a turning of the folding section 102 occurs about more than 180°, namely in total about 360°. Thus, a coiling can occur for the base section 20 and accordingly a retractable floor of the bag can be generated.
FIGS. 5 a to 5 d show a further possibility of the performance of a method according to the invention. Also here it is based on a tubular section 100, which comprises a conveyance direction F of tubular material 100 in its longitudinal direction L. Also here, starting from the left, the production of the tubular material 100 occurs, for example in form of an extrusion machine, wherein this tubular material 100 is particularly configured according to the embodiments of FIGS. 1 to 3.
FIG. 5 b shows a further step, wherein the turning of the folding section 102 to the connecting section 104 occurs previous to a cutting by the cutting device 84. Such a folding can be named as a Z-folding. After configuration of the turning it can be immediately cut by a cutting device 84 or parallel or previously the connection between the folding section 102 and the connecting section 104 can be completed with the help of the base device 82. This connection can be configured, for example with the help of hot air, with the help of sewing, with the help of gluing or with the help of other sealing techniques. In FIG. 5 d a possibility of a connection is shown, which uses an additional connecting element 40. Thus, after turning of the connecting element 40 in form of a cover sheet is applied and serves beneath the fixed connection of the folding section 102 with the connecting section 104 for a sealing of the base section 20 of the bag 10.
Therewith, FIGS. 4 a to 5 d show schematically a production device 80 according to the present invention.
In FIG. 6 an embodiment of a bag 10 according to the invention is shown. In its interior a packaging item 20 is shown schematically with a dash-dotted line. The base section 20 is preferably configured identical to the sealing section 50. It is particularly produced according to a method according to the invention like it is shown in the steps according to FIGS. 4 a to 4 d or 5 a to 5 d. Thereby, the folding axis FA extends preferably transverse to a longitudinal direction L of the tubular material 100 like it can be recognized in FIGS. 1 and 2. Therewith, the short sides of the bag 10 are sealed in a manner according to the invention and therewith the short geometric extensions with reduced material effort and reduced production effort are used for the configuration of the base section 20 and the sealing section 50.
The previous description of the embodiments describes the present invention only within the scope of examples. Naturally, single features of the embodiments, as far as technically meaningful, can be combined freely with one another without leaving the scope of the present invention.

REFERENCE SIGNS

10 Bag
20 Base section
30 Connecting material
40 Connecting element
50 Sealing section
60 Interior
80 Production device
82 Base device
84 Cutting device
100 Tubular material
102 Folding section
104 Connecting section
110 Coating material
120 Reinforcing material
200 Packaging item
300 Transport device
400 Filling device
FA Folding axis
L Longitudinal direction of the tubular material
F Conveying direction of the tubular material

Claims

1. Method for producing bags comprising the following:

providing of a tubular material comprising a coating material at the outside of the tubular material and at least an reinforcing material in form of a tissue structure for the mechanic reinforcement of the coating material,

establishing of a base section of a bag,

wherein,

for the establishment of the base section

a folding section of the tubular material is turned on a connecting section of the tubular material about at least 180°, and

the outside of the turned folding section is connected to the outside of the connecting section, wherein the coating material is exclusively connected to itself,

wherein the following steps are performed additionally:

cutting of the tubular material to the desired length of the bag,

filling of the bag after establishing the base section with packaging items,

establishing of a sealing section for sealing the bag after filling the bag.

2. Method according to claim 1,

wherein the folding section is at least turned twice.

3. Method according to claim 2,

wherein the folding section is at least sectionally turned about at least 360°.

4. Method according to claim 1,

wherein the connection of the turned folding section with the connecting section is produced by at least one of the following method steps:

hot air fan

sealing

sewing

gluing.

5. Method according to claim 1,

wherein for the connection of the turned folding section with the connecting section a connecting material is used at least sectionally.

6. Method according to claim 1,

wherein the turning of the folding section occurs about a folding axis, which is adjusted transverse or mainly transverse to a longitudinal direction of the tubular material.

7. Method according to claim 6,

wherein the connection between the turned folding section and the connecting section occurs only sectionally over the entire extension of the tubular material and in direction of the folding axis.

8. Method according to claim 1,

wherein the turned folding section is connected with the connecting section via at least a connecting element.

9. (canceled)

10. Method according to claim 8,

wherein the bag is picked from a transport device after configuration of the base section and before cutting the tubular material.

11. Method according to claim 10,

wherein after cutting of the tubular material the bag is transported to a filling device by the transporting device and is filled with packaging items at the filling device.

12. Production device for the production of bags from tubular material comprising a coating material at the outside of the tubular material and at least an reinforcement material in form of a tissue structure for a reinforcement of the coating material, wherein the production device comprises a base device for the configuration of a base section,

wherein the base device is configured for a turning of a folding section of the tubular material to a connecting section of the tubular material about at least 180° and a connection of the outside of the turned folding section (102) with the outside of the connecting section (104), wherein the coating material is exclusively connected to itself, wherein the production device is configured for the performance of a method with the features of claim 1 to 8.

13. (canceled)

14. Production device according to claim 11,

wherein the base device comprises a tongs device for turning the folding section.

15. Production device according to claim 11,

wherein the base device comprises a guide device.

16. Production device according to claim 11, wherein at least the tubular material or the bag is conveyed by transport elements, which work reversing or circulating.

17. Production device according to claim 11,

wherein subsequent to the base device at least one transport device is assembled, which is configured for picking and transporting the bag subsequent to the configuration of the base section.

18. Production device according to claim 11,

wherein at least a cutting device is assembled for cutting the tubular material subsequent to the configuration of the base section.

19. Production device according to claim 15,

wherein at least subsequent to the cutting device or to the transport device a filling device is assembled for filling the bag with packing items.

20. Bag from tubular material comprising a coating material at the outside of the tubular material and at least a reinforcement material in form of a tissue structure for the reinforcement of the coating material with a base section and a sealing section, which seals the interior of the bag,

wherein at least the base section or the sealing section comprise at least a folding section of the tubular material, which is turned on a connecting section of the tubular material about at least 180° and the outside of the folding section is connected with the outside of this connection section wherein the coating material is exclusively connected to itself,

wherein packaging items are assembled in the interior of the bag and the bag is produced by a production device, at least with an action selected from a group consisting of:

cutting of the tubular material to the desired length of the bag,

filling of the bag after establishing the base section with packaging items,

establishing of a sealing section for sealing the bag after filling the bag, and after cutting of the tubular material the bag is transported to a filling device by the transporting device and is filled with packaging items at the filling device.

21-22. (canceled)

23. Method according to claim 1, wherein the sealing section is configured in the same manner or mainly in the same manner like the base section.

24. Method according to claim 2, wherein the folding section is at least partially turned on itself.

25. Method according to claim 5, for the connection of the turned folding section with the connecting section a connecting material is used at least sectionally towards a conveying direction of the tubular material.