WO2013137443A1

WO2013137443A1 - Check valve

Info

Publication number: WO2013137443A1
Application number: PCT/JP2013/057430
Authority: WO
Inventors: 桑垣　傳美; 高橋　章仁
Original assignee: キッコーマン株式会社
Priority date: 2012-03-15
Filing date: 2013-03-15
Publication date: 2013-09-19
Also published as: TW201348088A; JP2013193740A

Abstract

In order to suppress resistance during discharge of a liquid from a container, and, when stopping discharge of the liquid, in order to keep air from penetrating into the container and to stop the dripping phenomenon, this check valve is provided with an elastic protruding body (2) which having an opening and closing part (5) for discharging the liquid, a movable film (3) which is connected to the protruding body (2) and is displaced in accordance with the change in pressure during liquid discharge operations from the opening and closing part (5), and a movable film support body (4) which displaceably supports the movable film (3) in a prescribed position of the liquid discharge part (11) of the flexible liquid container, wherein the liquid (20) retained in the liquid discharge part (11) during discharge of the liquid from the flexible liquid container is drawn towards said check valve (1) by the movable film (3) moving back to the initial state after liquid discharge.

Description

Check valve

The present invention relates to a check valve. More specifically, the present invention relates to an improvement in the structure of a check valve provided at a liquid discharge port of a flexible liquid container.

In order to prevent the deterioration of quality due to oxidation of fluid objects or liquids (hereinafter simply referred to as liquids) such as foods, beverages, pharmaceuticals, quasi-drugs, drugs, cosmetics, etc. A so-called vacuum-type container that suppresses oxidation of the metal is used (see, for example, Patent Document 1).

In the container described in Patent Document 1, a check valve for preventing air from entering the container is attached to the liquid discharge port of the container. This check valve has a structure in which a cut is provided in the dome-shaped head, and the cut is opened when pressure is applied in the liquid discharge direction, and conversely closed when pressure is applied in the filling direction. Thus, when stopping the discharge of the liquid, a sealing effect (hereinafter also referred to as a non-return effect) for preventing air from entering the container from the outside of the container is provided.

Japanese Patent Laid-Open No. 10-338239

However, the above-described conventional containers equipped with a check valve are intended to have a check effect, but are attached to the discharge port when the container is tilted to discharge the liquid in the container and then stand up again. Even if liquid droplets that sag fall and adhere to the periphery of the discharge port, spout, or cap, or droplets remain without dripping from the discharge port, the sealing that comes with the cap when the cap is closed The liquid remaining at the discharge port overflows from the discharge port due to the stopper, and the surroundings of the discharge port, the spout, the cap, and the like are soiled (hereinafter also referred to as a dripping phenomenon). On the other hand, it is possible to take measures to narrow the tip of the outlet as a measure to prevent such dripping phenomenon, but it is necessary to rely on experience values to determine how effective the tip diameter should be. At present, if the tip of the discharge port is made too thin, resistance when discharging the liquid from the container increases, and the amount of liquid discharge decreases, resulting in poor usability.

Accordingly, the present invention is a check valve attached to a liquid discharge port of a flexible liquid container, and suppresses the resistance when discharging the liquid from the container, and when the liquid discharge is stopped, It is an object of the present invention to provide a check valve that does not invade the liquid and can prevent the dripping phenomenon.

The present inventor has made various studies to solve such problems. For example, in order to effectively suppress the dripping phenomenon as described above, the use of a one-way valve such as a teat for baby bottles (see JP-T-2008-534101 as an example) as a check valve The position direction valve prevents the liquid from leaking from the baby bottle, and introduces air into the baby bottle instead of the liquid sucked from the baby bottle through the teat. Nipple for baby bottles arranged away from the nipple of the nipple, and a slight improvement effect is observed with respect to the dripping phenomenon, but it is satisfactory because the one-way valve becomes a resistance when the liquid is discharged and the amount of liquid discharged is reduced. I can't get a good check valve. The present inventor, who has further studied focusing on such points, has come to obtain new knowledge that leads to the solution of such problems.

The present invention is based on such knowledge, and in a check valve provided in a liquid discharge part of a flexible liquid container, an elastic protrusion provided with an opening / closing part for discharging liquid, and the protrusion A movable membrane connected to the open / close portion and displaced in accordance with a pressure change during a liquid discharge operation from the opening / closing portion, and a movable membrane support body that displaceably supports the movable membrane at a predetermined position of the liquid discharge portion of the flexible liquid container And the liquid stored in the liquid discharge portion when the liquid is discharged from the flexible liquid container is drawn into the check valve side by the movement of the movable film to return to the initial state after the liquid is discharged. It is.

In this check valve, when the liquid is discharged, the movable film moves to the tip side of the liquid discharge port due to a pressure change accompanying the liquid discharge operation, and the protrusion is opened to discharge the liquid. When the pressure (internal pressure) acting on the check valve decreases after the liquid is discharged, the incision is closed, and the liquid that has been discharged from the check valve but has not dropped from the container is stored in the liquid discharge port. Become. Here, when the pressure (internal pressure) acting on the check valve becomes low, the movable film that has moved to the tip side moves to return to the initial state while the cut is closed. When returning to the initial state in this way, the movable film draws the liquid stored in the liquid discharge port to the check valve side, and suppresses the subsequent dripping phenomenon (the phenomenon of drawing the liquid in this way). Also referred to as suckback in the specification). Further, after the liquid discharging operation is completed, until the next liquid operation is started, the protrusion of the projecting body is maintained in a closed state to prevent air from entering the container (liquid sealing). Further, according to this check valve, it is possible to suppress the dripping phenomenon and the air intrusion without reducing the tip of the liquid discharge port. There will be no increase in resistance.

In the check valve as described above, in the initial state, it is preferable that at least a part of the movable film is recessed toward the main body side of the flexible liquid container.

Alternatively, in the initial state, it is also preferable that at least a part of the movable film is located on the main body side of the flexible container liquid container with respect to the outer peripheral portion of the movable film supported by the movable film support. In this case, the movable film may be shaped like a bowl that approaches the main body side of the flexible container liquid container toward the center.

In the check valve, it is preferable that at least a part of the movable film is curved in the radial direction.

Alternatively, in the check valve, it is also preferable that the middle of the movable film is bent.

It is also preferable that the thickness of the movable film is equal to or less than the thickness of the head of the projecting body.

Furthermore, it is also preferable that the thickness of the movable film is not uniform. In the check valve in this case, the thickness of the movable film can be changed along the radial direction of the check valve. Alternatively, the thickness of the movable film can be changed along the circumferential direction of the check valve.

In the check valve, it is also preferable that the center of the protruding body is deviated from the center of the movable film.

Furthermore, in the check valve, it is also preferable that the protruding body has a tapered shape.

According to the present invention, it is possible to suppress the dripping phenomenon without suppressing the resistance at the time of discharging the liquid from the container and preventing the air from entering the container when the discharge of the liquid is stopped.

It is a perspective view of the flexible liquid container of an erect state which shows an example of the usage example of the non-return valve which concerns on this invention. It is sectional drawing of the non-return valve integrated in the spout with a cap which shows one Embodiment of this invention. It is sectional drawing for demonstrating the structural example of a non-return valve. It is the schematic for demonstrating the operating state of a non-return valve, (A) is an initial state, (B) is the state which is pressurizing and deforming the container connected to the non-return valve, and is discharging the liquid from a container (C) shows a state immediately after the pressure applied to the container is released and the discharge of the liquid is stopped. It is sectional drawing of the non-return valve which shows the other example of a shape of a movable film | membrane. It is sectional drawing of the non-return valve which shows the operation example of the movable film | membrane shown in FIG. 5 sequentially. It is sectional drawing of the non-return valve which shows the operation example of the movable film | membrane shown in FIG. 5 sequentially. It is sectional drawing of the non-return valve which shows the operation example of the movable film | membrane shown in FIG. 5 sequentially. It is sectional drawing of the non-return valve which shows the other example of a shape of a movable film | membrane. It is sectional drawing of the non-return valve which shows the other example of a shape of a movable film | membrane. It is sectional drawing of the non-return valve which shows the other example of a shape of a movable film | membrane. It is sectional drawing of the non-return valve which shows the other example of a shape of a movable film | membrane. It is sectional drawing of the non-return valve which shows the other example of a shape of a movable film | membrane. It is sectional drawing of the non-return valve which shows the example of a shape of the movable film | membrane which deform | transforms in steps. It is sectional drawing of the non-return valve which shows the other example of a shape of the movable film | membrane which deform | transforms in steps. It is the (A) top view and (B) sectional view of a non-return valve which show other shape examples of the movable film which changes in steps. FIG. 15 is a cross-sectional view of a check valve showing an operation example of the movable film shown in FIG. 14 in the order of (A) to (E). It is sectional drawing of the non-return valve which shows the example of a shape of the protruding body which further improved the liquid sealing performance. FIG. 19 is a cross-sectional view of a check valve showing an operation example of the projecting body shown in FIG. 18 in the order of (A) to (C). It is a fragmentary sectional view which shows the whole lamination peeling container (flexible liquid container) which shows another embodiment of this invention. It is a longitudinal cross-sectional view explaining the effect | action at the time of discharge of the contents in a lamination peeling container (flexible liquid container). It is a longitudinal cross-sectional view explaining an effect | action when a lamination peeling container (flexible liquid container) restore | restores after discharge of the contents.

Hereinafter, the configuration of the present invention will be described in detail based on an example of an embodiment shown in the drawings. FIG. 1 shows a film container as an example of a flexible liquid container 10 provided with a check valve 1, FIG. 2 shows an outline of the structure around the liquid discharge portion 11 of the flexible liquid container 10, and FIG. FIG. 4 shows an example of the structure of the check valve 1 according to the present invention, and FIG.

The check valve 1 in the present embodiment is a valve composed of a protruding body 2, a movable film 3, and a movable film support 4, and is a tubular body (for example, spout 12) of the liquid discharge portion 11 of the flexible liquid container 10. (Refer to FIG. 2 etc.). This check valve 1 does not cause resistance to discharging the liquid 20 (a) when discharging the liquid 20 from the flexible liquid container 10 (does not hinder the use of the flexible liquid container 10). And (b) when the discharge of the liquid 20 is stopped, there is a check effect that prevents air from entering the flexible liquid container 10, and (c) the liquid 20 After completion of the discharge operation, the liquid 20 stored in the liquid discharge portion 11 of the flexible liquid container 10 is drawn into the check valve 1 side, and a suck back function for suppressing the subsequent dripping phenomenon is exhibited. Has been.

(Projection 2)
When the liquid 20 in the flexible liquid container 10 is discharged, the protrusion 2 stably discharges the liquid 20 without resistance to the flow of the liquid 20, and external air when the discharge of the liquid 20 is stopped. Is configured to prevent entry into the flexible liquid container 10. A cut (slit) 5 that opens according to the internal pressure is provided at least at the tip 2a of the projecting body 2 (see FIGS. 2 and 3).

The protruding body 2 of the present embodiment has a shape in which a hemispherical portion constituting the tip portion 2a and a tubular portion constituting the side wall portion 2b are combined (see FIGS. 2 and 3). However, this is only a preferred example, and other specific shapes are exemplified, such as a hemispherical shape, a columnar shape such as a cylinder, an elliptical column, a prismatic shape such as a triangular column, a quadrangular column, or an opposite angle. A head portion (tip portion 2a) formed in a columnar shape or a polygonal pyramid shape such as a triangular pyramid or a quadrangular pyramid, and a main body portion (side wall portion 2b) having a tubular shape, an annular shape, a pipe shape, a tube shape, a tubular shape, or a hose shape. Combinations can be mentioned.

The projecting body 2 prevents the deformation of the distal end portion 2a and the side wall portion 2b of the projecting body 2 when the liquid 20 is discharged or when the ejection is stopped or when the ejection is stopped. In order to reliably obtain the effect of preventing the invasion of air from the outside to the inside of the liquid container 10, the liquid container 10 is preferably contained within the tubular portion 12 e of the spout 12 (see FIG. 2). Further, if the protruding body 2 is accommodated in the tubular portion 12e of the spout 12 as described above, there are the following advantages (1) and (2). That is, (1) it is possible to prevent the projecting body 2 from being tampered with or used unnecessarily or subjected to an impact. For example, when the tip 2a and the side wall 2b of the check valve 1 are picked or pinched by a rod or the like, an external force outside the assumed operating range and outside the assumed direction of the check valve 1 is applied. If added, the function as the check valve 1 may be impaired. However, if the structure is as described above, it is possible to prevent the function from being impaired in this way. (2) A phenomenon in which the liquid 20 stored in the liquid discharge part 11 of the flexible liquid container 10 is drawn to the check valve 1 side because the protruding body 2 is accommodated in the tubular part 12e of the spout 12. (Suckback function) can be expressed effectively or more reliably.

Here, the length of the projecting body 2 along the center line of the tubular portion 12e of the spout 12 is L2, and the bottom portion (the base end portion supported by the movable film 3) 2c of the projecting body 2 from the tubular portion 12e. When the length to the end of L1 is L1 (see FIG. 3), from the viewpoint of the above (1) and (2), preferably L1> L2. However, if L2 is too small, the depth of cut (L3) for determining the discharge amount of the liquid 20 has to be small, so the length is appropriately determined from the discharge amount of the liquid 20.

Further, the inner diameter (D1) of the protruding body 2 satisfies the relationship of D3> D1 in relation to the inner diameter (D3) of the tubular portion 12e. From the viewpoint of the ability to suppress the dripping phenomenon (suck back performance), D3> (D1 / 2) is preferable, and D3> (D1 / 3) is more preferable.

Note that the protrusion 2 does not have to be positioned at the center of the movable film 3. In addition, a plurality of protruding bodies 2 may be provided in one check valve 1.

(Incision 5)
The notch 5 provided as an opening / closing part in the projecting body 2 has a tip-breaking structure so that the liquid 20 is allowed to pass when the liquid is discharged, and the others are closed to prevent air from entering. It is configured. The cut 5 according to the present embodiment is formed by a broken portion cut into a linear shape, but may be formed by a discontinuous cut such as a hole, a broken line, or a chain line. In the present embodiment, the linear cut 5 is provided (see FIG. 2 and the like), but this can also be curved. Also, the depth of cut at both ends can be varied. Further, the cut 5 may be one (one place) or a plurality of (a plurality of places), and may be intersected when there are a plurality of the cuts. When a large discharge amount of the liquid 20 is required or when the viscosity of the liquid 20 is high, the notch 5 may preferably have a continuous linear structure, and conversely, the discharge amount of the liquid 20 is small. When it is desired to precisely control the discharge amount or when the viscosity of the liquid 20 is low, it may be preferable that the notch 5 is a hole or a discontinuous structure.

Further, from the viewpoint that the cut 5 opens more widely when the liquid is discharged, the cut depth (L3) extends not only to the hemispherical portion (tip portion) 2a of the projecting body 2 but also to the cylindrical portion (side wall portion) 2b. ) Is preferable (see FIGS. 2 and 3).

Here, the length (L3) of the notch 5 is L2 ≧ L3, preferably L2> L3, with respect to the length (L2) of the protrusion 2. In the case of L2 = L3, depending on the material of the check valve 1 and the viscosity and properties of the liquid 20, the protruding body 2 may easily tear from the cut 5 due to repeated use of the check valve 1. It is preferable to set appropriately according to the material and the like. Further, from the viewpoint of easy discharge of the liquid 20, it is preferable that 0.1L2 ≦ L3 <L2, more preferably 0.5L2 ≦ L3 <L2, and still more preferably 0.8L2 ≦ L3 <L2.

(Movable membrane 3)
The movable film 3 is an elastically deformable film connected to the above-described projecting body 2, and the outer peripheral portion 3 a is moved by the movable film support 4 at a predetermined position of the liquid discharge portion 11 of the flexible liquid container 10. It is supported. The movable film 3 is displaced so as to swell in conjunction with the pressure change during the liquid discharging operation, and then, when returning to the original initial state, the dripping phenomenon is suppressed by the suck back phenomenon according to the displacement amount. . In order to improve the suck back performance in the check valve 1, the amount of deformation when the movable film 3 is deformed by pressure fluctuation is made larger than the amount of deformation when the protrusion 2 is deformed by pressure fluctuation. It is more effective. Specifically, i) a material that is more elastically deformable than the projecting body 2 is selected as the movable film 3. ii) The projecting body 2 and the movable film 3 are made of the same material or a material having the same elastic modulus. When used, it is effective to adopt a means such that the thickness (T2) of the movable film 3 is made thinner than the thickness (T1) of the head of the protrusion 2.

The thickness T1 and the thickness T2 are preferably 1 μm or more, preferably 2 μm or more, although depending on the material constituting the movable film 3 and the projecting body 2, the viscosity and properties of the liquid 20, and the discharge amount. Further preferred. If the movable film 3 and the projecting body 2 are too thin, they cannot withstand the pressure of the liquid 20 and may be damaged, or may be damaged at the time of molding. It is possible to suppress the occurrence. However, considering the ease of deformation or displacement, T1 and T2 are preferably 50 mm or less.

The movable film 3 may be a flat, flush film in the initial state, but if at least a part of the movable film 3 is recessed toward the main body 14 side of the flexible liquid container 10, the movable film 3 This is preferable in that the amount of deformation 3 can be further increased. In the present embodiment, in the initial state, the movable film 3 having a bowl shape that approaches the main body 14 side of the flexible liquid container 10 toward the center is used (see FIGS. 2 and 3). In this case, assuming that the angle (obtuse angle) formed by the projecting body 2 and the movable film 3 is θ (see FIG. 3), generally θ = 10 to 170 °, preferably θ = 60 to 120 °, more preferably It is 91 to 120 °.

Moreover, the thickness of the movable film 3 does not need to be uniform. For example, the movable film 3 may be formed so as to become thicker from the projecting body 2 toward the movable film support 4, or conversely, formed so as to be thin. It may be. Alternatively, the movable film 3 may be formed to be partially thick or thin. In short, it is sufficient that the movable film 3 is configured to realize a deformation amount sufficient for a sufficient suck back phenomenon.

(Movable membrane support 4)
The movable film support 4 supports the outer peripheral portion 3a of the movable film 3 in a state where the movable film 3 can be displaced (see FIG. 2 and the like). The movable film support 4 may be integrally formed with the projecting body 2 and the movable film 3, or may be bonded to the movable film 3 after being molded alone. The movable membrane support 4 of the present embodiment is tubular or annular, pipe-shaped, tube-shaped, tubular, hose-shaped according to the inner periphery of the tubular portion (for example, the tubular portion 12e of the spout 12) in the liquid discharge portion 11. The check valve 1 is fixed directly to the liquid discharge part 11 of the flexible liquid container 10 or to a tubular body (for example, spout 12) connected to the flexible liquid container 10.

The peripheral shape of the movable film support 4 is not limited to a circle, and the cross-sectional shape may be an ellipse or a polygon such as a rectangle. Further, the movable membrane support 4 may be inscribed in a tubular body (for example, the tubular portion 12e of the spout 12) as shown in FIG. 3, and the movable membrane support 4 also serves as a tubular body. Alternatively, the movable membrane support 4 and the tubular body 6 may have an integral structure.

Further, when the movable membrane support 4 is inscribed in a tubular body (for example, the tubular portion 12e of the spout 12), from the viewpoint of easy discharge of the liquid 20, the inner diameter (D2) of the movable membrane support 4 is Although it is preferable to be as close as possible to the inner diameter (D3) of the tubular body 6, D3-D2 (that is, the thickness of the movable membrane support 4 is 2) because of the strength of the movable membrane support 4 and the like, ease of molding, and ease of handling. Double value) is preferably 2 μm or more, more preferably 10 μm or more.

Further, it is preferable that the check valve 1 has a structure in which the movable film support 4 can be easily disposed at a predetermined position of the liquid discharge part 11. For example, the step 12f is provided on the inner periphery of the spout 12, and the tip edge 4a of the movable membrane support 4 is brought into contact with the step 12f, so that the movable membrane support 4 and thus the check valve 1 as a whole is discharged. It becomes easy to position the part 11 at a predetermined position (see FIG. 2).

(Material constituting check valve 1)
The material constituting the check valve 1 is preferably a material that is easily elastically deformed and has a large elongation at break in order to effectively exhibit the above-described actions (a), (b), and (c). Specific examples include synthetic resins such as polyethylene and polypropylene, and rubber materials such as elastomers, synthetic rubbers, and natural rubbers. Among these, elastomers and rubber materials are preferable.

Further, the projecting body 2, the movable film 3, and the movable film support 4 constituting the check valve 1 may be formed of different materials, or may be formed of the same material. When the check valve 1 is used in a food container, it is preferably silicone rubber.

The hardness of the rubber material is 30 to 80 degrees, preferably 40 to 70 degrees, more preferably 50 to 60 degrees as measured by a JISK6253 type A durometer hardness test. The hardness may be measured by the material constituting the check valve 1 itself or by adding a filler described later, or by molding the check valve 1.

∙ Fillers can be added to the elastomer. As the filler, silica and carbon black which are reinforcing fillers are preferable. The silica may be either dry silica or wet silica. These silicas may be used as they are, or those subjected to a surface treatment with an organosilicon compound such as organochlorosilane, organoalkoxysilane, organopolysiloxane, hexaorganodisilazane may be used.

Other fillers include finely baked silica powder, titanium oxide powder, alumina powder, ground quartz, ground cristobalite, diatomaceous earth powder, aluminosilicate powder, magnesium oxide powder, aluminum hydroxide powder, iron oxide powder, zinc oxide Powder, heavy calcium carbonate powder, zinc white, basic magnesium carbonate, activated calcium carbonate, magnesium silicate, aluminum silicate, titanium dioxide, talc, mica powder, aluminum sulfate, calcium sulfate, barium sulfate, glass fiber, etc. Examples thereof include inorganic fillers and organic reinforcing agents or organic fillers such as polyester fibers, polyamide fibers, vinylon fibers, and aramid fibers. In general, the content of the filler in the rubber material is 1 to 50% by weight, preferably 5 to 40% by weight. The average particle size of the filler is generally about 0.1 to 50 μm, preferably 1 to 40 μm.

As an example of a method of adding a filler to the elastomer used for the check valve 1 of the present embodiment, a master batch is prepared by blending a high concentration of the filler and other additives as required into the elastomer. The method of mixing a masterbatch with an elastomer is mentioned.

As a crosslinking agent, 2,5-dimethyl-2,5-di (t-butylperoxy) hexyne-3, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, 2,2 -Bis (t-butylperoxy) -p-diisopropylbenzene, dicumyl peroxide, di-t-butyl peroxide, t-butyl perbenzoate, 1,1-bis (t-butylperoxy) -3,3 , 5-trimethylcyclohexane, 2,4-dichlorobenzoyl peroxide, benzoyl peroxide, p-chlorobenzoyl peroxide, 2,4-dicumyl peroxide, dialkyl peroxide, and ketal peroxide may be added.

Additives other than the above include plasticizers, softeners, heat resistance agents, anti-aging agents, lubricants, tackifiers, scorch inhibitors, cross-linking accelerators, cross-linking aids, accelerating aids, cross-linking retarders, colorants, Examples include ultraviolet absorbers, flame retardants, oil resistance improvers, and foaming agents. Specific examples include metal oxides, amines, fatty acids and derivatives thereof, polydimethylsiloxane oil, diphenylsilanediol, trimethylsilanol, and phthalic acid derivatives. , Adipic acid derivatives, trimellitic acid derivatives, process oil, coal tar, castor oil, calcium stearate, phenylenediamines, phosphates, quinolines, cresols, phenols, dithiocarbamate metal salts, iron oxide, cesium oxide, Examples include potassium hydroxide, iron naphthenate, and potassium naphthenate.

(Flexible liquid container 10)
The flexible liquid container 10 may be a molded container formed by sheet molding, blow molding, injection molding, or the like, or may be a laminate of films composed of a single layer or a plurality of layers. In particular, a flexible material such as a standing pouch made of a multilayer film or a so-called Delami bottle in which an inner container is detachably laminated on the inner surface of an outer container (see, for example, JP-A Nos. 03-133748 and 2009-149327). The liquid container 10 is preferable from the viewpoints of discharging the liquid 20 filled in the container and suppressing air intrusion into the container.

The flexible liquid container 10 is preferably composed of a plurality of layers. A base material layer that forms an outer layer, a sealant layer that forms an inner layer, an adhesive layer that bonds the base material layer and the sealant layer, and a flexible material. The gas barrier layer that enables long-term storage of the liquid 20 in the conductive liquid container 10 is preferable. The gas barrier layer may be a layer that absorbs a gas such as oxygen, water vapor, and carbon dioxide that may deteriorate the liquid 20 by reaction with the liquid 20.

The flexible liquid container 10 preferably has a layer that blocks light such as sunlight, ultraviolet rays, and infrared rays. Examples of the layer include aluminum foil, application of ink having a light blocking function, and light reflection by multilayering.

As an application example of the check valve 1 to the flexible liquid container 10 as described above, for example, the check valve 1 is built in a spout 12 made of a synthetic resin such as polyethylene or polypropylene, and the spout having the check valve 1 built-in. Heat seal, high frequency seal 12 and plastic film and sheet of polyethylene, polypropylene, polyester, polycarbonate, nylon resin, etc., metal foil and sheet, or flexible liquid container 10 composed of composite film and sheet made of these materials For example, the check valve 1 may be disposed at a predetermined position of the flexible liquid container 10 by bonding by hot air sealing, microwave heating, ultrasonic sealing, or the like. It is also possible to apply and provide a packaging material capable of performing the three actions (a) to (c) as the flexible liquid container 10.

(Spout 12 with cap 13)
The spout 12 includes a tubular portion 12e, a liquid discharge port 12a formed at the tip of the tubular portion 12e, a cap attachment portion 12b formed on the outer periphery of the tubular portion 12e, and a check valve fixed at the lower portion thereof. It is comprised by the junction part 12d of the part 12c and the container main body 14 attached to the lower part further. A cap 13 having a sealing plug 13a is attached to the cap attaching portion 12b.

(liquid)
The liquid 20 filled in the flexible liquid container 10 is a fluid object or liquid such as food, beverages, drugs, quasi drugs, drugs, cosmetics, and the like. Specific examples include water, aqueous solutions, organic solvents, low viscosity liquid substances such as liquids dissolved in organic solvents, as well as mayonnaise, high viscosity jelly-like substances and gel substances, etc. It is contained in the liquid 20 that can be filled in the liquid container 10.

(Operation of check valve 1)
Then, the outline | summary of the action | operation of the non-return valve 1 which concerns on this embodiment is demonstrated using FIG. 4 (refer FIG. 3, FIG. 4). 3 shows an initial state, FIG. 4A shows a state in which the liquid 20 is being discharged from the initial state, and FIG. 4B shows a state in which the flexible liquid container 10 connected to the check valve 1 is added. FIG. 4C shows a state immediately after the pressure applied to the flexible liquid container 10 is released and the discharge of the liquid 20 is stopped. Show.

In the initial state shown in FIG. 3, the flexible liquid container 10 is in a predetermined posture such as being vertically placed and is not in use (see FIG. 1). When the user picks up the flexible liquid container 10 and tilts so that the liquid discharge portion 11 faces downward, the state transitions to the state shown in FIG. 4A until the liquid 20 is discharged.

In the state shown in FIG. 4 (A), the notch 5 provided in the projecting body 2 is closed, and the movable film 3 is in a flat state (a flush state).

In the state shown in FIG. 4B, the liquid 20 is forced in the discharge direction (downward in the drawing) by the increase in the internal pressure of the container due to the user grasping or pressurizing the flexible liquid container 10 or the gravity acting on the liquid 20. The notch 5 provided in the projecting body 2 is opened by the pressure of the liquid 20. The opening of the cut 5 allows the liquid 20 to be discharged stably without causing resistance to discharging the liquid 20. Further, the movable film 3 is deformed so as to bulge to the outside air side by the pressure, and has an effect of assisting when the cut 5 is opened.

FIG. 4C shows a state immediately after removing the factor that increased the internal pressure of the container or canceling the gravity acting on the liquid 20 by reversing the vertical relationship between the flexible liquid container 10 and the check valve 1. Show. The notch 5 is closed when the above pressure is released and the internal pressure of the container becomes equal to or lower than that of the outside air, thereby preventing air from entering the flexible liquid container 10. Further, the movable film 3 which has been deformed so as to bulge is deformed so as to return to the main body 14 side of the flexible liquid container 10, and the liquid 20 stored outside the movable film 3 in the liquid discharge unit 11 is tubular. (In the case of this embodiment, it sucks in instantaneously in the tubular part 12e of the spout 12), and a dripping phenomenon is suppressed.

Further, when the tubular body is plugged (in the case of the present embodiment, the cap 13 is put on the liquid discharge port 12a at the distal end of the tubular portion 12e), a space is provided at the distal end portion of the tubular body (tubular portion 12e). Therefore, it can be plugged so that the liquid 20 does not leak from the tubular body.

As described above, the check valve 1 of the present embodiment (a) does not provide resistance to discharging the liquid 20 when discharging the liquid 20 from the flexible liquid container 10, and (b) discharges the liquid 20. (C) After the discharge operation of the liquid 20 is completed, the liquid stored in the liquid discharge portion 11 is drawn into the check valve 1 side. , To suppress the subsequent dripping phenomenon.

The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention.

(Other shapes of movable film 3)
For example, in the above-described embodiment, as an example of the check valve 1 in which at least a part of the movable film 3 is recessed toward the main body 14 side of the flexible liquid container 10, the reverse of the movable film 3 being recessed in a bowl shape. Although the stop valve 1 has been illustrated (see FIG. 3 and the like), in addition, from the viewpoint of the amount of deformation when the movable film 3 is deformed by pressure fluctuation, at least a part of the movable film 3 is movable film support 4. The movable film 3 located on the main body 14 side of the flexible liquid container 10 with respect to the outer peripheral portion 3a of the movable film 3 supported by is also suitable (see FIGS. 5 to 8).

In the check valve 1 shown in FIGS. 5 to 8, in the initial state, the movable film 3 has a cross-sectionally curved shape. Such a movable film 3 can act as a reaction force that prevents the compressive stress generated in a part of the movable film 3 up to the middle when the internal pressure of the container increases and deforms to the tip side. When the maximum value is exceeded, the stress acts as a force to further deform the movable film 3 further toward the distal end side, and pushes the deformation. Moreover, the movable film 3 having a curved cross section has a large surface area and a large amount of displacement (stroke) at the time of deformation because the surface is wavy. Therefore, it is possible to increase the amount of deformation of the movable film 3 due to fluctuations in the internal pressure and to further increase the suck back performance due to the deformation of the movable film 3 (movable shown in FIGS. 6 to 8). (See movement of membrane 3).

The above is a check valve 1 (see FIG. 9) in which the bent portion in the middle of the cross section of the movable film 3 is an acute angle, and the check valve in which the unevenness in the radial direction of the movable film 3 is opposite to that of the check valve 1 in FIG. 1 (see FIG. 10), and the check valve 1 (see FIG. 11) having a curved cross section but a relatively small unevenness is similar in that the suck back performance can be improved to some extent. is there. The check valve 1 shown in FIG. 12 has the movable film 3 in an initial state substantially flat, but has an annular convex part (may be a concave part) that increases the surface area of the movable film 3 in the circumferential direction. That is why the suck back performance is improved.

(Example of shape of movable film 3 that deforms stepwise)
It is also preferable that the movable film 3 is deformed stepwise (moves a plurality of times) when the container internal pressure fluctuates. According to such a check valve 1, the liquid 20 is suddenly discharged by the movable film 3 being deformed in a fine and stepwise manner from when the cap 13 is opened until the liquid 20 is discharged. This makes it possible to construct a flexible liquid container 10 that is suppressed and easier for the user to use.

Such a check valve 1 makes the radial length of the movable film 3 asymmetric by shifting the center of the protruding body 2 from the center of the movable film 3 (see FIG. 14). The thickness is changed along the radial direction to provide an inclination (see FIG. 15), and the thickness of the movable film 3 is changed along the circumferential direction to make it non-uniform in the circumferential direction (circumferential direction by arrows in the figure). 16) showing that the thickness is changed).

Among these, an example of operation of the check valve 1 shown in FIG. 14 when the internal pressure of the flexible liquid container 10 fluctuates will be described (see FIG. 17).

In the check valve 1 in the initial state (see FIG. 17A), the cut 5 provided in the protruding body 2 is closed, and the movable film 3 is in a flat state (a flush state). When a user grips or presses the flexible liquid container 10 to increase the internal pressure of the container, or when force is applied to the liquid 20 in the discharge direction (downward in the drawing) due to gravity acting on the liquid 20, first, the movable film 3 is moved. Of these, the side having a longer radial length is deformed so as to bulge toward the tip side, but the amount of deformation on the side having a shorter radial length is small (see FIG. 17B). When the internal pressure further increases, the side of the movable film 3 that has a shorter radial length is also deformed to the tip side, and the cut 5 provided in the projecting body 2 is opened, and the liquid discharger 11 is opened through the open cut 5. The liquid 20 is discharged from (see FIG. 17C). After that, when the factor that has increased the internal pressure of the container is removed or the gravity acting on the liquid 20 is released by reversing the vertical relationship between the flexible liquid container 10 and the check valve 1, the notch 5 In addition, the container is closed when the internal pressure of the container is equal to or lower than that of the outside air, thereby preventing air from entering the flexible liquid container 10 (see FIG. 17D). Further, the movable film 3 which has been deformed so as to bulge is deformed so as to return to the main body 14 side of the flexible liquid container 10, and the liquid 20 stored in the liquid discharge part 11 is transformed into a tubular body (the tubular part of the spout 12). 12e) is instantaneously sucked into the liquid and the dripping phenomenon is suppressed (see FIG. 17E).

(Example of the shape of the projecting body 2 with further improved liquid sealability)
It is also preferable to have a structure in which the cut 5 in the closed state further improves the performance (liquid sealability) of preventing liquid from passing therethrough. For example, by making the protruding body 2 of the check valve 1 into a tapered shape, it is possible to further improve the liquid sealability at the cut 5 (see FIG. 18).

An example of the operation of the check valve 1 when the internal pressure of the flexible liquid container 10 fluctuates will be described below (see FIG. 19). First, in the check valve 1 in the initial state, the cut 5 provided in the protruding body 2 is closed, and the movable film 3 is in a flat state (a flush state) (see FIG. 19A). When the user grips or presses the flexible liquid container 10, the container internal pressure increases, or when the force is applied to the liquid 20 in the discharge direction (downward in the drawing) due to the gravity acting on the liquid 20, the movable film 3 moves to the tip side. The notch 5 provided in the projecting body 2 is opened, and the liquid 20 is discharged from the liquid discharger 11 through the open notch 5 (see FIG. 19B). After that, when the factor that has increased the internal pressure of the container is removed or the gravity acting on the liquid 20 is released by reversing the vertical relationship between the flexible liquid container 10 and the check valve 1, the notch 5 Furthermore, the container is closed when the internal pressure of the container is equal to or lower than that of the outside air, and the liquid 20 and the air are prevented from entering the flexible liquid container 10. Further, the movable film 3 which has been deformed so as to bulge is deformed so as to return to the main body 14 side of the flexible liquid container 10, and the liquid 20 stored in the liquid discharge part 11 is transformed into a tubular body (the tubular part of the spout 12). 12e) instantaneously sucks into the liquid and suppresses the dripping phenomenon (see FIG. 19C).

So far, the example in which the check valve 1 according to the present invention is applied to the flexible liquid container 10 has been described, but the flexible liquid container 10 is only an example of a suitable application target of the present invention. Hereinafter, as another example of the flexible liquid container 10, a case where a laminated peeling container (also called a delamination container or the like) is an application target will be described (see FIGS. 20 to 22).

The delamination container (indicated by reference numeral 10 ') is an example of a discharge container that is adapted to pour out the content liquid by mainly pressing the container, and an inner container (inner layer) containing the content liquid, And an outer container (outer layer) in which inner containers are stacked. In a general delamination container, the inner container is formed of a flexible material that deforms by deformation as the content liquid decreases, and the outer container is formed of a material that elastically deforms and is discharged. An amount of outside air corresponding to the above is sucked from the outside air introduction hole and introduced between the inside container and the inside container.

As shown in FIG. 20 and the like, the delamination container 10 ′ of the present embodiment includes a flexible inner container 111 that contains a liquid 20 that is an example of the contents and deforms as the liquid 20 decreases. A container body 113 including an inner container 111 and an outer container 112 that is elastically deformable; a discharge cap 115 that is attached to a mouth portion 113a of the container body 113 and has a discharge port 114 for discharging the liquid 20; An overcap 116 and the like that are detachably disposed on the discharge cap 115 are provided.

Here, the container main body 113 is formed in a bottomed cylindrical shape, the overcap 116 is formed in a topped cylindrical shape, and the container main body 113 and the overcap 116 are covered with the overcap 116 attached to the discharge cap 115. Are arranged so that their central axes are located on a common axis. Hereinafter, this common axis is referred to as the container axis O, the overcap 116 side along the container axis O direction is referred to as the upper side, the bottom side (not shown) of the container body 113 is referred to as the lower side, and the direction orthogonal to the container axis O is the diameter. The direction that goes around the container axis O is called the circumferential direction.

In addition, the overcap 116 may be connected to the discharge cap 115 by the hinge part 116a (refer FIG. 21 etc.). In order to prevent the overcap 116 from getting in the way when the liquid 20 is discharged from the discharge port 114, the hinge portion 116 a discharges in a state where the delamination container 10 ′ is tilted so that the discharge port 114 faces downward and is in a discharge posture. It arrange | positions so that it may become a position higher than the exit 114. FIG.

The container body 113 is a so-called Delami bottle in which the inner container 111 is detachably laminated on the inner surface of the outer container 112. The container body 113 is formed by, for example, blow molding a co-extruded two-layer parison. The outer container 112 is made of, for example, polyethylene resin or polypropylene resin, and the inner container 111 is made of, for example, a polyamide-based synthetic resin that is not compatible with the resin forming the outer container 112 or ethylene vinyl alcohol. It is made of polymerized resin.

The mouth portion 113a of the container body 113 is formed in a two-stage cylindrical shape including an upper cylindrical portion 117 positioned on the upper side and a lower cylindrical portion 118 positioned on the lower side and formed with a larger diameter than the upper cylindrical portion 117. (See FIG. 21 and the like). A male screw portion 129 is formed on an outer peripheral surface of a portion (hereinafter referred to as an outer upper tube portion) 117 a formed of the outer container 112 in the upper tube portion 117. In addition, an intake hole 119 through which outside air is sucked into the inner container 111 is formed in a portion of the outer upper cylinder portion 117a located below the male screw portion 129 (see FIG. 22 and the like). A communication groove 120 extending in the container axis O direction is formed in a portion of the male screw portion 129 located above the intake hole 119.

The inner peripheral surface of the outer upper cylindrical portion 117a is a cylindrical surface, and a portion (hereinafter, referred to as an inner upper cylindrical portion) 117b formed of the inner container 111 of the upper cylindrical portion 117 is laminated on the inner peripheral surface. (See FIG. 21 and the like). The upper end portion of the inner upper cylindrical portion 117b may be folded back outward in the radial direction and disposed on the open end of the outer upper cylindrical portion 117a.

The discharge cap 115 includes an inner plug member 121 that closes the mouth portion 113a of the container main body 113, and a top cylindrical body cylinder member 123 that covers the inner plug member 121 and is formed with a discharge port 114. (See FIG. 21 and the like). The inner plug member 121 includes a plug main body 147 whose outer peripheral edge is disposed on the opening end of the mouth 113 a of the container main body 113, and a communication cylinder portion 122 erected from the plug main body 147.

The stopper main body 147 includes a bottomed cylindrical inner cylinder portion 124 disposed in the mouth portion 113a of the container main body 113 with a gap between the mouth portion 113a and a radial direction from the upper end of the inner cylinder portion 124. A flange portion 125 that protrudes toward the outside of the container body 113 and is disposed on the opening end of the mouth portion 113a of the container body 113, and an outer cylinder portion 126 that extends upward from the outer peripheral edge of the flange portion 125; An intermediate cylinder part 127 extending downward from the flange part 125 so as to surround the inner cylinder part 124 from the outside in the radial direction and fitted in a liquid-tight manner in the mouth part 113a of the container body 113. (See FIG. 21 and the like). The inner cylinder part 124, the flange part 125, the outer cylinder part 126, and the intermediate cylinder part 127 are arranged coaxially with the container axis O. An outer air circulation hole 128 that penetrates in the radial direction and opens downward is formed in the lower end portion of the outer cylinder portion 126.

On the bottom wall portion of the inner tube portion 124, the above-described communication tube portion 122 is disposed. In addition, a through-hole 142 that opens both in the inner container 111 and in the communication cylinder portion 122 is provided in the bottom wall portion. The through-hole 142 is composed of, for example, a plurality of small holes arranged evenly around the container axis O (see FIG. 21 and the like).

The main body cylinder member 123 is formed in a top cylinder shape that is arranged coaxially with the container axis O. On the inner peripheral surface of the peripheral wall portion 123 a of the main body cylinder member 123, a female screw portion 130 is formed that is screwed to the male screw portion 129 of the mouth portion 113 a of the container main body 113. In addition, in the peripheral wall portion 123a, a lower cylinder portion 118 in the mouth portion 113a of the container body 113 is fitted in an airtight state in a lower end portion located below the screw portion in which the female screw portion 130 is formed, and the screw The outer tube portion 126 of the inner plug member 121 is fitted in the upper end portion located above the portion.

A discharge port 114 for discharging the liquid 20 is formed in the top surface portion 131 of the discharge cap 115. In the delamination container 10 ′ of this embodiment, the discharge port 114 is formed so as to be coaxial with the container axis O (see FIG. 21, etc.), but is formed at a position shifted from the container axis O. Also good.

Further, the top surface portion 131 of the discharge cap 115 is formed with an outside air introduction projection 133 protruding upward, and the outside air introduction projection 133 is formed with an outside air introduction hole 134 (see FIG. 21 and the like). In order to prevent the liquid 20 from being sucked from the outside air introduction hole 134, the outside air introduction protrusion 133 is in a state where the delamination container 10 ′ is inclined and discharged to discharge the liquid 20 from the discharge port 114. , Formed at a position higher than the discharge port 114 (see FIG. 21 and the like).

For example, in the present embodiment, the outside air introduction protrusion 133 is formed so as to stand between the discharge port 114 and the hinge part 116 a, and the outside air introduction hole 134 is located at a position higher than the top surface part 131. It is arranged at a spatial distance from 131. For this reason, even if the liquid 20 dripping from the discharge port 114 adheres to the outer surface of the discharge cap 115, the dripping liquid 20 is hardly sucked from the outside air introduction hole 134. Further, the outside air introduction hole 134 is opened upward when the delamination container 10 ′ is inclined to discharge the contents from the discharge port 114, and more preferably the outside air introduction protrusion 133 is vertical. It is formed so as to open upward (see FIG. 21 and the like).

The specific shape of the outside air introduction protrusion 133 described above is not particularly limited. For example, in this embodiment, the length in the circumferential direction is longer than the thickness of the discharge cap 115 in the radial direction (the direction perpendicular to the container axis O). The shape is curved along an arc centered on the discharge port 114. According to the external air introduction protrusion 133 having such a shape, the liquid 20 adhering to the outer surface of the discharge cap 115 due to dripping or the like is prevented from approaching the external air introduction hole 134 and is sucked from the external air introduction hole 134. Can be avoided. Such an outside air introduction protrusion 133 is preferably curved along an arc centered on the discharge port 114.

The discharge cap 115 is formed with an engaging portion 132 with which the overcap 116 in the covered state is engaged. For example, in the present embodiment, a step portion slightly projecting in the radial direction is formed around the top surface portion 131 of the discharge cap 115, and the step portion engages with the overcap 116 in the covered state. A joining portion 132 is formed (see FIG. 21 and the like).

Moreover, it is preferable that the top surface portion 131 is formed smoothly. For example, in the laminated peeling container 10 ′ of the present embodiment, a portion of the top surface portion 131 excluding a portion where the discharge port 114 is formed and a portion where the outside air introduction protrusion 133 is formed is a smooth surface. Yes. In this case, even if the dripping liquid 20 adheres to the top surface portion 131 of the ejection cap 115, it can be wiped off with one wipe.

The upper plate portion 132 is formed with a receiving tube portion 135 that extends downward and has an outer diameter equal to the inner diameter of an outer fitting tube portion 140 described later. Further, a discharge cylinder 136 whose inside is the discharge port 114 is provided through the upper plate portion 132.

An inner seal cylinder portion (seal portion) 137 extending downward from the overcap 116 is fitted in the discharge port 114 (see FIG. 20 and the like).

Here, between the inner plug member 121 and the main body cylinder member 123, an outer fitting cylinder portion 140 that is externally fitted to the communication cylinder portion 122 of the inner plug member 121 is disposed. The outer fitting cylinder part 140 is arranged coaxially with the container axis O, and the lower end part of the outer fitting cylinder part 140 is fitted on the communication cylinder part 122 and in the inner cylinder part 124 of the inner plug member 121. The upper end portion of the outer fitting cylindrical portion 140 is fitted to the receiving cylindrical portion 135 of the main body cylindrical member 123.

An annular air valve portion 141 projecting outward in the radial direction is formed at an intermediate portion of the outer fitting tube portion 140 in the container axis O direction (see FIGS. 21 and 22). The air valve portion 141 is elastically deformable, and switches between communication between the intake hole 119 and the outside air introduction hole 134 and blocking of the communication.

Also, the inner stopper member 121 is formed with a communication recess 143 that allows the discharge port 114 and the inner container 111 to communicate with each other. The communication recess 143 is configured by the inside of the communication tube portion 122 and is disposed coaxially with the container axis O. Thereby, the container axis O direction and the axial direction of the communication recessed part 143 correspond. In the illustrated example, the communication recess 143 is positioned below the discharge port 114, that is, inside the inner container 111 along the container axis O direction. Further, the internal volume of the communication recess 143 is larger than the internal volume of the discharge port 114.

The check valve 1 is disposed in the communication cylinder portion 122 of the inner plug member 121.

Next, the operation of the delamination container 10 'configured as described above will be described.

As shown in FIG. 21, when the liquid 20 is discharged from the delamination container 10 ′, first, the overcap 116 is removed from the discharge cap 115. Then, in a state where the delamination container 10 ′ is inclined to be in a discharge posture so that the discharge port 114 is directed downward from the horizontal plane, the delamination container 10 ′ is pressurized so as to be pushed inward in the radial direction and squeezed (elastic). The inner container 111 is deformed together with the outer container 112 to reduce the volume.

Then, the pressure in the inner container 111 rises, and the liquid 20 in the inner container 111 presses the check valve 1 through the through hole 142. Further, the liquid 20 in the inner container 111 is discharged to the outside through the through hole 142, the communication recess 143, the outer fitting cylinder 140, and the discharge port 114 (see FIG. 21).

After that, when the pressing force to the check valve 1 by the liquid 20 in the inner container 111 is weakened by stopping or releasing the pushing of the delamination container 10 ′, the elastic restoring force of the delamination container 10 ′ The check valve 1 returns to its original shape along the direction of the container axis O due to the generated pressure difference (see FIG. 22).

As described above, according to the delamination container 10 ′ according to the present embodiment, after the liquid 20 is discharged, the liquid 20 in the discharge port 114 is drawn and the air A is sucked into the discharge port 114 from the outside. Therefore, it is possible to suppress the liquid 20 that has not been returned to the inner container 111 from remaining in the discharge port 114. Thereby, it is possible to prevent the liquid 20 from leaking from the discharge port 114 after the liquid 20 is discharged.

Next, embodiments of the present invention will be described in detail.

(Preparation of check valve 1)
Silicone Compound A (Toray Dow Corning, SH841U, density 1.14 g / cm ³ , rubber hardness 41 degrees), Silicone Compound B (Toray Dow Corning, SH861U, density 1.23 g / cm ³ , rubber hardness 61 degrees ) Are mixed into a cavity composed of three molds using a transfer molding method, and then the silicone rubber material is cured at 175 ° C. for 6 minutes. Thus, the check valve 1 was manufactured. The check valve 1 had a hardness of 55 degrees and a density of 1.19 g / cm ³ .

The protruding body 2 of the check valve 1 includes a hemispherical tip (head) 2a and a side wall (tube) 2b, and has a length of 6.9 mm, an inner diameter of 4.0 mm, The thickness of the tip 2a was 0.5 mm, and the length of the cut 5 (cut depth) was 6.0 mm.

The thickness of the movable film 3 was 0.15 mm, and the angle (obtuse angle) θ formed between the protruding body 2 and the movable film 3 was 110 °.

(Example of use of check valve 1)
The check valve 1 produced as described above was assembled in a spout 12 with a cap 13 shown below (see FIG. 2). The spout 12 and the cap 13 are made of polyethylene and are obtained by an injection molding method. The inner diameter of the spout 12 was 13.2 mm.

Next, a spout 12 with a cap incorporating the check valve 1 was attached to the container body 14 shown below (see FIG. 1).

-Container body 14
The container body 14 is made of a laminated film of PET / ON / L-LDPE. Here, PET is a biaxially stretched polyethylene terephthalate film having a thickness of 38 μm, ON is a biaxially stretched nylon-6 film having a thickness of 15 μm, L-LDPE is a density of 0.925 g / cm ³ having a thickness of 95 μm, ethylene and 1 -Shows linear polyethylene which is a copolymer with hexene. The joint 12d of the spout 12 and the container body 14 are joined by heat welding, and the viscosity of the soup sauce 20 having a check valve 1, the cap 13, the spout 12, and the container body 14 is 3 mPa · s (23 ° C.). 500 mL of soy sauce container was filled with '(Example 1).

For comparison, a container described in Patent Document 1 filled with 500 mL of the above-mentioned soy sauce (Comparative Example 1) and a check valve in the soy sauce container with the size ratio shown in FIG. 4 of JP-T-2008-534101 are used. A modified one-way valve (Comparative Example 2) was produced.

After opening the soy sauce containers of Example 1 and Comparative Examples 1 and 2 so that the soy sauce can be discharged, the spout tip is horizontally inclined by slowly tilting from the upright state shown in FIG. 1 so that the spout faces downward. Tilted the container until it tilts 45 ° to the soy sauce, discharges soy sauce, returns to the original upright state in 2 seconds after the discharge starts, returns to the upright state, immediately closes the cap and discharges again. Repeated times. After the above operation, it was left for 1 hour for observation.

Evaluation is the amount of liquid discharged per discharge operation, the number of times the cap is opened before the dripping phenomenon occurs (hereinafter referred to as the number of times of opening), and the state of air intrusion into the container body after being left for 1 hour. Compared. In addition, the inferior sack back performance is that the liquid remaining at the tip of the spout is pushed out from the tip of the spout by the sealing plug 13a when the cap is closed, and the dripping phenomenon is likely to occur, and the number of times of opening is small. .

In the container of Example 1, soy sauce was sucked back at the moment (about 0.2 seconds) when the discharge of soy sauce was stopped and the container was returned to the upright position, and no dripping phenomenon occurred when the number of opening was 40 times. . In addition, the amount of soy sauce discharged in 2 seconds was constant even after 40 times of about 10 mL. There was no air intrusion after leaving for 1 hour.

In the container of Comparative Example 1, since there was no suck back performance, liquid sag occurred from the first time. The amount of soy sauce discharged in 2 seconds was constant even after 40 times of about 10 mL. There was no air intrusion after leaving for 1 hour.

In the container of Comparative Example 2, sackback occurred instantaneously, but the amount was small and the number of times of opening was 3 times. In addition, the amount of soy sauce discharged in 2 seconds was about 7 mL at the beginning of the experiment, but when the number of discharges increased, the amount of discharge gradually decreased at about 5 mL. In addition, air intrusion after standing for 1 hour was observed.

(effect)
The check valve 1 according to the present invention does not provide resistance to liquid discharge when the liquid 20 is discharged from the flexible liquid container 10, and air enters the container from the outside of the container when the discharge of the liquid 20 is stopped. And prevents the dripping phenomenon from occurring, and even if the discharge of the liquid 20 in the flexible liquid container 10 is stopped, there is no dripping and the flexible liquid container 10 and its surroundings are soiled. There is no.

The check valve according to the present invention can be widely used not only in foods but also in products that dislike oxidation due to contact with air, for example, flexible liquid containers that contain or fill drugs, medicines, and the like. In addition, the physical properties such as viscosity are not particularly limited as long as they are liquids. For example, soy sauce, mirin, ponzu, soup, dashi, wine, sauce, oil, olive oil, liquor, soft drinks, water, soup It can also be used in flexible liquid containers such as mayonnaise, ketchup, sauce, mustard, wasabi, jelly, miso, coffee, cream, lotion, and dairy products.

DESCRIPTION OF SYMBOLS 1 ... Check valve 2 ... Projection body 3 ... Movable membrane 3a ... Outer peripheral part 4 of movable membrane ... Movable membrane support body 5 ... Notch (opening-closing part)
DESCRIPTION OF SYMBOLS 10 ... Flexible liquid container 11 ... Liquid discharge part 12e ... Tubular part (tubular body) of spout
14 ... Container body 20 ... Liquid

Claims

In the check valve provided in the liquid discharge part of the flexible liquid container,
An elastic protrusion provided with an opening / closing part for discharging liquid;
A movable film that is connected to the projecting body and is displaced according to a pressure change during a liquid discharging operation from the opening and closing unit;
A movable film support for movably supporting the movable film at a predetermined position of the liquid discharge portion of the flexible liquid container;
And the liquid stored in the liquid discharge portion when the liquid is discharged from the flexible liquid container is drawn into the check valve side by the movement of the movable film to return to the initial state after the liquid is discharged. Check valve.
2. The check valve according to claim 1, wherein in the initial state, at least a part of the movable film is recessed toward the main body side of the flexible liquid container.
In an initial state, at least a part of the movable film is located on the main body side of the flexible container liquid container with respect to the outer peripheral portion of the movable film supported by the movable film support. The check valve according to claim 2.
4. The check valve according to claim 3, wherein, in an initial state, the movable film has a bowl shape that approaches the main body side of the flexible container liquid container toward the center.
The check valve according to claim 1, wherein at least a part of the movable film is curved in a radial direction.
The check valve according to claim 1, wherein the movable film is bent in the middle.
The check valve according to any one of claims 1 to 6, wherein a thickness of the movable film is equal to or less than a thickness of a head of the protruding body.
The check valve according to any one of claims 1 to 7, wherein the movable film has a non-uniform thickness.
9. The check valve according to claim 8, wherein the thickness of the movable film changes along a radial direction of the check valve.
The check valve according to claim 8, wherein the thickness of the movable film changes along a circumferential direction of the check valve.
The check valve according to any one of claims 1 to 10, wherein a center of the protruding body is deviated from a center of the movable film.
The check valve according to any one of claims 1 to 11, wherein the protruding body has a tapered shape.