WO2006075758A1

WO2006075758A1 - Valve device for releasing gas and packaging body having the same

Info

Publication number: WO2006075758A1
Application number: PCT/JP2006/300541
Authority: WO
Inventors: Shigeki Hiramatsu
Original assignee: Nishiki Trading Co., Ltd.; Kureha Corporation
Priority date: 2005-01-17
Filing date: 2006-01-17
Publication date: 2006-07-20

Abstract

[PROBLEMS] To provide a valve device for releasing a gas formed in a simple structure and having excellent sealability. [MEANS FOR SOLVING PROBLEMS] This valve device (2) comprises a thick-walled base body (3) having a vent hole (8), a valve element (4) stacked on the base body (3) and forming a flow passage (9), and a cover body (5) holdingly retaining the valve element (4). The valve element (4) is formed in a slender shape and disposed on the base body (3) so as to cover at least the upper part of the vent hole (8). A blank part (base body exposed part) (3a) in which the valve element (4) is not disposed is present on the upper surface of the base body (3), and the cover body (5) is adhered to the valve element (4) while covering the entire surface of the blank part (3a) of the base body (3). The valve element (4) is formed of a resin film with a self-adhesiveness such as a lap film for packaging food, can easily discharge gas, and after the gas is discharged, rapidly fits to the base body or the cover body to maintain a fitted state so as to secure high sealability.

Description

Specification

Degassing valve device and package equipped with the same

Technical field

TECHNICAL FIELD [0001] The present invention relates to a degassing valve device that is attached to a packaging body such as a packaging bag to release gas inside the packaging body, and a packaging body equipped with the same.

Background art

[0002] Freshly roasted coffee beans or milled, powdered scallops after being granulated), foods such as rice, bean grains, miso, or certain drugs · Like chemicals, there are articles (products) that generate carbon dioxide and other gases through fermentation and chemical reactions. When such a gas generating article is housed in a bag or container and hermetically packaged, the generated gas is used to prevent the bag or container from bursting due to internal pressure or to maintain the quality of the contents. there is a need force ^s to release.

[0003] However, foreign matter such as dust and micro-insects may invade from the outside simply by opening a vent hole in a bag or container. In addition, in the case of foods such as coffee beans and miso, it is necessary to suppress the entry of air (especially oxygen) as much as possible in order to maintain the quality. Accordingly, various venting valve devices having a check function have been proposed, and those described in Patent Documents 1 to 3 listed below are examples of flat type devices that are attached to the surface of a bag or a container.

[0004] The valve device of Patent Document 1 (= JP-A-63-152551) is shown in A1 to A3 of FIG. In the figure, A1 is a plan view, A2 is a sectional view taken along line A2-A2 of A1, and A3 is a sectional view taken along line A3-A3 of A1. The valve device 31 is bonded to a bag 32 having a gas discharge hole 38 formed therein, and has a base film 33 having a through hole 36 communicating with the gas discharge hole 38, and an upper surface of the base film 33 as shown in the figure. And a valve film 35 having both side edges adhered to (adhered to) the base film 33 via an adhesive layer 34. A space (gap) formed by the base film 33 and the valve film 35 forms a gas ventilation path 37 at a portion where the adhesive layer between the two adhesive layers 34 is not formed. Sealing liquid such as silicone oil is injected into the inner peripheral edge of the air passage 37 to prevent the entry of air or the like from the outside. [0005] However, in the valve device having such a configuration, there is a possibility that the sealing liquid leaks to the outside or, on the contrary, enters the inside of the bag (packaging body), resulting in contamination and sanitary / safety problems. In addition, there is a problem that the injection of the seal liquid takes time and costs increase. Furthermore, there is a problem that if the sealing liquid is completely discharged or the amount of the sealing liquid is reduced as the gas is released, the function of preventing the backflow of air is lost, or the function is remarkably reduced. Furthermore, when the surface of the package is paper, the sealing liquid may be absorbed by the paper and the sealing effect may be lost, which is a major drawback for miso cups.

[0006] The valve device of Patent Document 2 (= Japanese Patent No. 3346030) is shown in B1 to B3 of FIG. In the same figure, B1 is a plan view, B2 is a B2-B2 cross-sectional view of B1, and B3 is a B3-B3 cross-sectional view of B1. The valve device 41 is disposed on the bag 32 having the gas discharge hole 38 formed therein, and has a base film 43 having a vent hole 42 communicating with the gas discharge hole 38, and an adhesive on the upper surface of the base film 43. And a cover film 45 attached via an agent layer 44.

[0007] Then, on the adhesive layer 44 applied to the cover film 45, a strip-like non-adhesive treatment layer (printing ink coating layer) 46 for eliminating the adhesiveness with the base film 43 is illustrated. In addition, the non-adhesive treatment layer 46 is formed as a gas ventilation path 47 by forming it so as to extend to both ends of the base film 43 so as to cover the upper part of the ventilation hole 42. Then, a sealing liquid such as silicone oil is injected into the gas ventilation path 47 to improve the sealing performance and prevent the entry of air or the like from the outside. Reinforcing materials 48 and 48 are provided on the upper surfaces of both ends of the cover film 45.

[0008] However, in the valve device having such a configuration, a problem due to the sealing liquid occurs as in the case of A1 to A3 in FIG. In addition, even when a belt-like coating layer 46, such as printing ink, is applied to the pressure-sensitive adhesive layer 44, there are defects such as adhesiveness remaining due to variations in the application of printing ink, etc. There is a problem that it is difficult to ensure the sealing performance and the practicality is poor. Furthermore, the adhesive layer 44 is exposed when the belt-like coating layer 46 is torn due to, for example, deformation due to gas pressure or deteriorates with time, or the belt-like coating layer 44 is attacked by the solvent contained in the adhesive. As a result, the pressure-sensitive adhesive layer 44 may be exposed. For this reason, if the cover film 45 adheres to the base film 43 by the pressure-sensitive adhesive layer 44 and does not function as a valve device, there is a problem. [0009] The valve device of Patent Document 3 (= Japanese Patent No. 2754751) is shown by Cl and C2 in FIG. In the figure, C1 is a plan view and C2 is a cross-sectional view taken along line C2-C2 of C1. The valve device 51 is disposed on a bag 32 having a gas discharge hole (not shown) through an adhesive layer 57 and has a base film 53 having a vent hole 52 communicating with the gas discharge hole, and a gas A sealing film 54 made of a resin film laminated on the surface of the base film 53 to form an air passage, a pressure valve body 55 for pressing the sealing film 54 against the base film 53, and covering the pressure valve body 55, And a control film 56 disposed in contact therewith.

[0010] Then, the base film 53, the sealing film 54, and the control film 56 are bonded at opposite side edge portions 58, and a portion (non-adhesion portion) sandwiched between the both side edge portions 58 is a gas ventilation path. . Further, the pressing valve body 55 is folded in two, and one end edge thereof is bonded to the sealing film 54 and the control film 56. When gas is generated in the bag 32 and the internal pressure rises, the sealing film 54 is formed by the internal pressure lifting the sealing film 54 against the pressing force from the pressing valve body 55 side. When the gas is exhausted by using the gap between the substrate film 53 and the base film 53 as a gas ventilation path (gas escape path), and the gas discharge is completed, the pressure valve body 55 holds the sealing film 54 between the sealing film 54 and the base film 53. The gas passage between them is blocked, and the gas passage is formed as a dry passage that does not require sealing liquid.

[0011] In the valve device having such a configuration, no sealing liquid is required, so there is no problem due to the sealing liquid. However, the process of attaching the pressing valve body 55 to the base film 53 in a folded state is complicated, and actually Is difficult to manufacture. Even if it can be manufactured, since the degree to which the sealing film 54 adheres to the base film 53 is not constant, the quality (check function) may not be constant. Further, the sealing film 54 is preferably made of a material that is as thin as possible and has a low strength (in order to have low elasticity) in order to improve the adhesion to the base film 53, but such a material is prone to wrinkles. There's a problem. Since the sealing film 54 is only partially adhered on the pressure valve body 55, the sealing film 54 is deformed by an external force to cause wrinkles, and as a result, the adhesion with the base film 53 is ensured. There is also a problem that it is difficult.

As described above, the conventional flat-type gas vent valve device has problems in terms of performance and quality stability, manufacturing cost, and the like.

[0013] Further, in Patent Document 4 (Japanese Patent Publication No. 59-34585), a cover sheet, a valve strip, An overpressure valve for a packaging container is disclosed, which has a configuration of a substrate sheet, and in which a valve strip is integrally and continuously formed up to the opposing outer peripheral edge of a cover sheet. However, in the overpressure valve described in this document, since the valve strip actually uses PET, when the gas pressure inside the package rises, the valve operates quickly and gas is exhausted from the air passage. However, after the gas is discharged, there is a risk that air from the outside, which is not sufficient in terms of sealing performance, may enter the packaging container from the air passage. Therefore, in the actual situation of use, a sealing liquid is applied in the air passage. For this reason, the malfunction by the above-mentioned sealing liquid arises. Also, since PET is non-self-adhesive in manufacturing, a simple manufacturing method is adopted in which the original material for the valve body is transferred from the release paper to the original material for the cover body as described below. I can't.

Patent Document 1: Japanese Patent Application Laid-Open No. 63-152551

Patent Document 2: Japanese Patent No. 3346030

Patent Document 3: Japanese Patent No. 2754751

Patent Document 4: Japanese Patent Publication No.59-34585

Disclosure of the invention

Problems to be solved by the invention

[0015] The present invention has been made in view of the above circumstances, and has solved the problems of the conventional flat type gas vent valve device that has problems in performance, quality stability, manufacturing cost, and the like. To provide a degassing valve device having a simple structure, high sealing performance without using a liquid sealant, easy to manufacture, and low in manufacturing cost, and a package equipped with the same. Is an issue.

Means for solving the problem

[0016] In order to solve the above problems, the present invention provides a degassing valve device that is used by being mounted on the surface of a package to release gas generated inside the sealed package. A sheet-like base body which has a vent hole communicating with a gas discharge hole vacated in the package body and is adhered to the surface of the package body via an adhesive layer;

In order to form an air passage through which the gas generated inside the package is discharged from the vent hole to the atmosphere, at least the upper portion of the vent hole is covered and directed toward the outer edge of the base body. In order to hold and hold the valve body on the base body, the valve body and the valve body on the base body. And a cover body that covers the entire blank area (= base body exposed part) where is not disposed,

The valve body is made of a resin film that is self-adhesive and is thinner than the base body and the cover body.

The air passage is formed from a gap between the base body and the valve body, or a gap between the cover body and the valve body.

When the air passage is formed by a gap formed by the base body and the valve body, the valve body is in direct contact with the base body without the adhesive layer at the air passage formation portion, and is in close contact with the base body. At the same time, the valve body and the cover body are bonded via an adhesive layer provided on the lower surface of the cover body. The curved body is deformed and the contact state is released, and an air passage is formed between the base body and the valve body / cover integrated. The air passage force gas is discharged, and after the gas is discharged, the package body is discharged. Due to the internal pressure drop, the valve body / cover unit is drawn onto the base body, and due to the self-adhesiveness of the valve body, the valve body adheres to the base body and closes the air passage, and the valve body and the base body adhere to each other. Held in a state,

When the air passage is formed by a gap formed by the cover body and the valve body, the valve body directly contacts the lower surface of the cover body without an adhesive layer at the air passage formation portion due to its self-adhesiveness. The valve body and the base body are bonded to each other via an adhesive layer provided on the upper surface of the base body, and the valve body and the adhesive layer are provided with through holes communicating with the vent holes. As a result, when the gas is discharged, the cover body and the valve body / base body are bent and deformed due to an increase in the internal pressure of the packaging body, and the contact state is released, and the cover body and the valve body / base body are disconnected. An air passage is formed between them, and the gas is discharged from the air passage. After the gas is discharged, the cover body is drawn onto the valve body Z base body due to a decrease in the internal pressure of the package body, and the self-adhesiveness of the valve body The cover body adheres to the valve body and closes the air passage, and the cover body Characterized in that it is held in a state where the valve body in close contact to provide a venting valve device [0017] Further, the present invention is a method for manufacturing the above venting valve device, wherein a wide valve body original fabric is previously laminated on the second release paper, and then only the wide valve body original fabric is ventilated. After making a notch in the width of the passage (= the width equal to the width of the valve body) and forming a narrow valve body raw material on the second release paper by peeling off the excess part other than the notch, this narrow width The second release paper force is transferred to the original body for the valve body to form a laminated body consisting of the raw material for the valve body with a narrow width / the original body for the cover, the first release paper Z base Forming a laminated body made of a body fabric through a ventilation hole at a predetermined interval; forming the first release paper / base body web that is formed through the ventilation hole into the narrow valve body; Laminate a laminate made of the original fabric for cover / cover integral to form a laminate consisting of the first release paper / the base fabric / the narrow valve stock web and the Z cover stock. The base material for the cover body other than the first release paper in the laminated body Z passes through each layer of the raw material for the valve body with a narrow Z width and the base material for the base body concentrically with the vent hole. Cutting the outer shape (= the outer shape of the cover body) to form the outer shape portion of the base body (= the outer shape portion of the cover body), and the first peeling of the raw material other than the cut-out outer shape portion A method for producing a degassing valve device comprising the step of forming a degassing valve device on the first release paper by peeling off from the paper.

[0018] Further, the present invention is a method for manufacturing the above venting valve device, comprising the step of forming through-holes at predetermined intervals in a laminate composed of the first release paper / base material, A step of cutting the outer shape of the valve body concentrically with the vent hole only in the original fabric for the valve body to which the release paper is pasted, other than the outer portion forming zone of the valve body formed by the cut The step of obtaining the second release paper having the outer shape of the valve body by peeling the original part for the valve body from the second release paper, the cover from the second release paper having the outer shape of the valve body formed A step of transferring and pasting the outer shape of the valve body to the body material, and a vent hole having been penetrated through the cover body material on which the outer shape of the valve body was transferred and pasted at the predetermined interval A laminate formed by laminating the first release paper / base material stack to form the first release paper / base material / valve outer shape. A step of forming a laminated body made of a raw material for a bar body, and through each layer of the raw material for a cover body in which the base body raw material / valve body outer shape portion in the laminated body is formed, A process of cutting the outer shape of the base body (= the outer shape of the cover body) concentrically with And a step of forming a gas vent valve device on the release paper by peeling off the first release paper force of the raw fabric portion other than the cut-out outer shape portion, to form a gas vent valve device. A manufacturing method is provided.

The invention's effect

[0019] In the degassing valve device of the present invention, the valve body constituting the air passage is made of a self-adhesive thin-film resin film, and therefore the member that forms the air passage (in the case of the cover body and the base body) In other words, it has a high sealing performance (non-return function) without injecting a sealant such as silicone oil. It does not occur at all. In addition, the gas generated inside the package body is bent and deformed by bending the cover body, the valve body, and the base body, and is diffused to the outside through the ventilation path. After that, the internal pressure of the bag decreases, and the valve body sticks to the member (base body or cover body) that forms the air passage due to its self-adhesiveness, and the contact state is maintained as it is. Maintains close contact with the air passage and has high sealing performance to prevent air intrusion and excellent sealing stability.

[0020] Since the other surface of the valve body (the surface that does not face the air passage) is strongly bonded to the cover body or the base body, even if the valve body is thin and easily deformed, The cover body and base body can be damaged even if external force such as gas pressure acts on the valve body by using a firm material with a firm shape such as a PET resin film (sheet). Both will not cause habits. As a result, it is possible to secure a high sealing performance (non-returnability) stably over a long period of time.

[0021] Further, the cover body is inclined at the portion that transitions from the both side surfaces of the valve body to the upper surface of the base body. For this reason, if the thickness of the valve body becomes more than a certain level, A gap extending in parallel with the air passage is generated between the agent layer, the upper surface of the base body, and the side surface of the valve body, which may reduce the sealing performance. However, in the present invention, the valve body is a thin film film. Therefore, it is possible to prevent a gap from being generated at the location on the side surface of the valve body and to ensure high sealing performance. Furthermore, by making the valve body narrower than the base body and cover body, the valve body and the base body exposed part can be pressed and held from above by the cover body, ensuring higher sealing performance of the valve body. can do. [0022] On the other hand, in manufacturing, by using a self-adhesive thin film resin film as a valve body, for example, a strip-shaped raw material that becomes a valve body is used as the original as described in Examples below. Using the self-adhesive property of the opposite side, while transporting the release paper (release paper) with the same width superimposed, make an incision in the outer part of the valve body, and then remove the excess part (the part other than the incision part) ) Is peeled off from the second release paper, the valve body can be easily and accurately and reliably transferred and bonded to the adhesive layer of the cover body. Therefore, manufacturing is very easy.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the following examples.

[1] First embodiment (FIG. 1)

FIG. 1 shows a first embodiment. FIG. 1 (A) is an external perspective view showing a state in which the degassing valve device 2 is mounted on the package 1 and used. The package 1 is not particularly limited as long as it can be sealed, such as a bag or a container. In addition, the attachment can be performed by attaching (bonding), for example, by bonding to an arbitrary part of the surface of the package 1 through a gas discharge hole formed in the package 1. The materials that make up the package 1 are required properties such as a single layer film of resin, a laminate of resin films, and a laminate of dissimilar materials in which an aluminum foil is laminated on the resin layer (for example, gas barrier properties, water resistance, etc.) Various types can be used depending on the case.

[0025] The structure of the gas vent valve device 2 is shown by (B) to (H) in FIG. (B) is a plan view, (C) is a cross-sectional view taken along the line C-C in (B), (D) is a cross-sectional view taken along the line D-D in (B), and (E) and (F) are gas discharge operations. (G) is a separated sectional view of (B) seen from the direction of the arrow D-D, (H) is an enlarged view of a part of (D), and (I) is a structural contrast diagram with respect to (H). .

[0026] The degassing valve device 2 has a circular base body 3 bonded to the surface of the packaging bag (packaging body) 1 and a width wider than the base body 3 laminated on the surface of the base body 3. A narrow strip-shaped valve body 4 and a cover integral 5 having a circular shape in plan view and holding the valve body 4 on the base body 3 and having the same size as the base body 3 are provided. An adhesive layer 6 is provided on the lower surface of the base body 3 and the entire lower surface of the cover body 5. Note that the shape of the base body and the like is not limited to a circular shape in plan view, and any shape such as a square shape in plan view can be employed. [0027] The packaging bag 1 is formed with a gas discharge hole 7 for discharging the gas generated inside, and a vent hole 8 communicating with the gas discharge hole 7 is formed at the center of the base body 3. Has been.

[0028] The base body 3 needs to maintain rigidity that does not stagnate and deform even when the packaging bag 1 is deformed, and a sheet made of a resin having high rigidity and strength such as polyethylene terephthalate (PET) is preferable. The thickness of the base body 3 is preferably 100 × m or more, but if it is excessively thick, problems such as an increase in manufacturing cost and catching of objects occur. Therefore, the thickness is preferably about 250 to 350 μm in practice. The base body 3 preferably has substantially no gas permeability.

[0029] The valve body 4 is for forming an air passage 9 (see FIGS. 1 (E) and 1 (F)) through which the gas generated inside the packaging bag 1 is released from the air hole 8 to the outside. The space (gap) formed by the body 4 and the base body 3 forms the air passage 9.

[0030] The valve body 4 is made of a resin film having "self-adhesiveness" that is in close contact with another object and maintains the close contact state.

[0031] In the present invention, "self-adhesive" means that the member itself without applying a pressure-sensitive adhesive or the like has the property of adhering to other objects, and the adhesive state is maintained only by being superposed. This means that even if it is turned upside down, it will not fall off due to its own weight. Specifically, it refers to the property that, for example, glass, smooth resin, earthenware, smooth metal, etc., can be kept in close contact by lightly pressing on the surface, and will not fall off by its own weight even if it is inverted. It can also be said that it is a property of sticking to each other just by stacking films (sheets).

[0032] When the valve body 4 is a single-layer body or a single-layer body, the entire strength layer of the valve body 4 is a resin film in which at least the layer facing the air passage 9 is self-adhesive. Become. Specific examples of the valve body 4 include the same material as the self-adhesive wrap film frequently used as a simple packaging material for foods. It does not matter whether or not there is a drawing process. More specifically, it is made of a resin film such as a polyvinylidene vinylidene type, a polyolefin type (for example, polyethylene, polypropylene, etc.), a chlorinated butyl type or a polybutyalcohol type. At least one kind of medium strength to which tackiness has been imparted is preferably used. By using the valve body 4 as such a self-adhesive resin film, the valve body 4 and the base body 3 or the valve body 4 and the cover body 5 are held in close contact with each other. [0033] The means for retaining the self-adhesiveness in the resin film includes, but is not limited to, a method of adding one or both of an adhesive and a tackifier. Examples of the pressure-sensitive adhesive include polyolefin oligomers such as polybutene, polybutadiene, and polypropylene, and polyhydric alcohols such as polyethylene glycolol, polyglycerin, and polypropylene glycol. Examples of the tackifier include surfactants such as sorbitan fatty acid esters (for example, sorbitan mono (tri) olate), propylene dallicol fatty acid esters, glycerin fatty acid esters (for example, glycerin mono (tri) olate), and the like. , paraffinic or cycloparaffinic liquid saturated hydrocarbons (e.g., naphthenic process oil, paraffin wax, liquid paraffin, etc.) (see e.g. _JP-10 _ ₃₂ 4809 JP) which, and the like. It is preferable to add a plasticizer in the case of a chlorinated film such as a polyvinyl chloride-vinylidene film or a chlorinated bur film. Examples of the plasticizer include, but are not limited to, ATBC (tributyl acetyltaenoate) and the like.

[0034] The valve body 4 is preferably made of a film or sheet material thinner than the thickness of the base body 3. More specifically, the valve body 4 preferably has a thickness of 25 / im or less, more preferably a thickness of 10 -20 / im, particularly those having a thickness of 10-15 / im are preferred.

[0035] The cover body 5 has the same shape and size as the base body 3, and is preferably thinner than the base body 3 with a thickness of 20 to 5 O / im. The cover body 5 is preferably a film or sheet material that is substantially non-gas permeable.

[0036] The material of the cover body 5 is a single layer or laminate of a resin film (or resin sheet) having rigidity and strength such as PET resin, a single layer of metal foil (sheet), a resin film (sheet) ) And metal foil (sheet) can be used for various materials.

[0037] The cover body 5 has a function to fix the valve body 4, a function to prevent wrinkles and damage of the valve body 4, and a force S. A certain degree of rigidity (elasticity) and strength are required to prevent the valve body 4 from being damaged or damaged. If the cover body 5 is too thin, the valve body 4 may be wrinkled. Conversely, if the cover body 5 is too thick, the air passage 9 may not be sufficiently opened due to difficulty in deformation, and gas discharge may be hindered. is there. Also, in order to hold the entire upper surface of the valve body 4 evenly, it is preferable to have a waist as much as possible. As a material for the cover 5 that satisfies these requirements Is preferably a PET resin film having a thickness of about 20 to 50 / im.

[0038] Further, the PET resin film has an advantage of good dimensional stability against environmental changes such as temperature change and humidity change. From this point, the cover body 5 is preferably made of PET resin.

[0039] The pressure-sensitive adhesive layer 6 is coated on the entire lower surface of the cover body 5. And since the valve body 4 is a strip | belt shape narrower than the base body 3 and the cover body 5, the base body 3 has the blank part (exposed part) 3a in which the valve body 4 is not laminated | stacked on the upper surface. The cover body 5 is adhered to the entire upper surface of the valve body 4 and also to the exposed portion 3a of the base body 3, so that the valve body 4 is in close contact with the upper surface of the base body 3. In a stable state.

[0040] As shown by the alternate long and short dash line in Fig. 1 (B), a notch 5a is formed at the edge of the edge of the cover body 5 so that the end of the valve body 4 is exposed from the cover body 5. It is preferable that the open end of the gas ventilation path 9 can be reliably opened to the outside.

[0041] Incidentally, a stepped portion is formed between the side surface of the valve body 4 and the upper surface of the base body 3 along both longitudinal sides of the belt-shaped valve body 4, and the cover body 5 includes the valve body 4 and the base body. Incline the part covering the margin 3a. When the thickness of the valve body 4 greatly exceeds the thickness of the adhesive layer 6 on the lower surface of the cover body 5, as shown in Fig. 1 (1), the adhesive layer 6 of the cover body 5 and the upper surface of the base body 3 There may be a gap 10 between the side face of the valve body 4. Since the gap 10 extends over the entire length of the valve body 4 in the longitudinal direction, air may enter the bag 1 through the gap 10. That is, the sealing performance may be reduced.

[0042] By applying a force to make the valve body 4 thin and a film, as shown in FIG. 1 (H), the dimension of the step generated between the valve body 4 and the upper surface of the base body 3 is Since it is about the same as or smaller than the pressure-sensitive adhesive layer 6, the pressure-sensitive adhesive layer 6 enters the stepped portion between the valve body 4 and the base body 3 by pressing the cover body 5 from above. It does n’t happen. Therefore, it is possible to ensure high sealing performance (returnability).

[0043] In the above configuration, when gas is generated inside the packaging bag 1, the internal pressure of the packaging bag increases, thereby causing the cover body 5Z adhesive layer 6Z valve body 4 and the base body 3 to bend and deform. An air passage (gap) 9 is formed between the base body 3 and the base body 3, and gas is discharged from the air passage 9 to the outside of the valve device 2 as shown in FIGS. 1 (E) and 1 (F). The After the gas is released, the internal pressure of the bag decreases, and the cover body 5 / adhesive layer 6 / valve body 4 is drawn to the base body 3 and then the valve The self-adhesiveness of the body 4 returns to the state of being in close contact with the base body 3. Therefore, it is possible to reliably prevent air (such as oxygen) from entering the bag.

[0044] By the way, when roasted coffee beans are ground or milled and packaged in the packaging bag 1, a large amount of gas is generated and the bag 1 is swollen. When packing a large number of packaging bags 1 into a cardboard box and shipping them, the force of extracting gas by crushing the packaging bag 1 inflated with gas. At this time, the packaging bag 1 is forcibly pushed. As the internal pressure becomes higher, the valve body 4 and the cover body 5 are reliably curved and deformed, the air passage 9 is opened, and the gas is forcibly released. When the gas is completely removed, the valve body 4 is brought into close contact with the base body 3 to ensure a sealing property that prevents air from entering.

[0045] The manufacturing method of the gas vent valve device 2 described above can be manufactured by the method shown in FIGS. 2 and 3 below.

[0046] (2) First production method

Fig. 2 shows the first manufacturing method, (A) is a diagram conceptually showing the entire process, and (B) to (F) are the original fabrics from the directions indicated by arrows B to F in (A). FIG.

[0047] As shown in the figure, the base body raw fabric 11, the valve body raw fabric 12, and the cover body original fabric 13 are each wound in a roll shape, and are rolled in the longitudinal direction by the roller group 14. It is paid out.

[0048] An adhesive layer (not shown) is applied to one surface of the base body original fabric 11, and the first release paper 15 is pasted to the adhesive layer. .

[0049] At the center of the second release paper 16 in the longitudinal direction, a valve element web 12 which is continuously cut in a band shape and in a narrow width is in close contact. First, after tying the second release paper 16 and the original material for the valve body having the same width as the second release paper 16, the width of the air passage (= the lateral width formed by the valve body 4) ) A considerable amount of cut was made, and the excess part other than the cut part was peeled off from the second release paper 16 and formed. As a result, the thin raw material for a valve body can be accurately and closely arranged on the second release paper without generating wrinkles. Needless to say, there is no pressure-sensitive adhesive layer between the second release paper 16 and the original valve body 12.

[0050] Specifically, the gas vent valve device 2 is manufactured through the following steps.

[0051] First, the base body original fabric 11 is fed out in the longitudinal direction, and the base body original fabric 11 and the first release paper 15 are provided with vent holes 8 by a punching device comprising a male mold 17 and a female mold 18. Predetermined Open up on the pitch. On the other hand, the valve body original fabric 12 is stuck to the adhesive layer of the cover body original fabric 13 by the roller group 14. Then, the force bar body web 13 on which the valve body web 12 is pasted is pasted on the base body web 11 on which the vent holes 8 are formed. The second release paper 16 is peeled off from the valve body original fabric 12 just before the cover body original fabric 13 is attached to the base body original fabric 11.

[0052] Since the valve body 12 is self-adhesive and is kept in close contact with the second release paper 16, even if the strength of the valve body 12 is weak, It is affixed to the cover fabric 13 without causing deformation or wrinkles (that is, with its shape retaining property maintained). This is one of the features of this manufacturing method.

[0053] The second release paper 16 holds the original valve body 12 in close contact with the second release paper 16, while the second release paper 16 is attached to the adhesive layer of the cover original 13 The adhesive layer of the cover body has a property of peeling more smoothly than the second release paper 16. Therefore, a force that can be considered as a means of previously humidifying the surface of the second release paper 16 is not limited to this.

[0054] Since the valve stock 12 is narrower than the cover stock 13, the portion of the adhesive layer of the cover stock 13 excluding the valve stock 12 is exposed. Yes. For this reason, the cover fabric 13 is affixed to the base fabric 11.

[0055] Next, the outer shape of the base body 3 is formed by a Thomson made up of a pressing die 19 and a receiving die 20 on a laminated body of the cover body raw fabric 13, the valve body original fabric 12 and the base body original fabric 11. Cut the notch and the notch 21 of the outer shape of the cover body 5 at the same time. In this case, the notch 21 is formed concentrically with the vent hole 8. Also, the notch 21 does not reach the first release paper 15. This is important. Further, since the notch 21 is formed at the same time in the cover body 13, the valve body 12, and the base body 11, the cover body 5, the valve body 4, and the base body 3 Therefore, there is no problem that the air passage 9 is blocked by the cover body 5.

[0056] Then, a blank portion of the cover body raw fabric 13 that leaves a cut of the outer shape of the cover body 5, a blank portion of the base body blank 11 that leaves a cut of the outer shape of the base body 3, and From the first release paper 15, remove the blank part of the outer shape of the valve body 4 from the original 12 for the valve body. Peel off. Then, the gas vent valve device 2 is continuously manufactured in a state where the first release paper 15 is scattered at predetermined intervals. When the degassing valve device 2 is shipped to another factory or user, the first release paper 15 can be placed on a roll.

In the above process, as shown by a two-dot chain line 22 in FIG. 2 (D), the cover body raw fabric 13 may be set slightly narrower than the base body raw fabric 11. In this way, even if the base body fabric 11 or the cover body fabric 13 is transferred while being shifted in the width direction, the shift body is absorbed and the cover body fabric 13 becomes the base body fabric 13. Force S to prevent it from sticking out of anti-11.

[0058] ^Second production method

Fig. 3 shows the second manufacturing method. (A) is a side view showing the main part, and (B) and (C) are views of the original material viewed from the direction indicated by the arrows (B) and (C). In FIG. 3, the same parts as those in FIG.

[0059] This manufacturing method is basically the same as the first manufacturing method. The difference from the first manufacturing method is that the valve body 12 is not directly attached to the cover body 13 as it is. The cutout of the outer shape of the valve body 4 cut out from the original fabric 12 is attached to the cover original fabric 13 at the same pitch as the vent holes 8.

[0060] As a pre-process for attaching the cut of the outer shape of the valve body 4 to the cover body raw material 13, the stamping die 26 and the receiving die 27 are added to the valve body original material 12 attached to the second release paper 16 By cutting the outer cut of the valve body 4 at the same pitch as the pitch of the vent holes 8 by Thomson equipped with, first, the blank part excluding the cut of the outer shape of the valve body 4 of the valve body raw material 12 ( The portion indicated by the parallel oblique lines in FIG. 3 (B) is peeled off from the second release paper 16, and then the cut of the outer shape of the valve body 4 is pasted on the adhesive layer of the cover body raw fabric 13.

[0061] Since the valve stock 12 is self-adhesive, the cut in the outer shape of the cut-out valve body 4 is not peeled off from the second release paper 16, so the valve body 4 The cut in the outer shape can be reliably transferred to the cover body 13. This second manufacturing method is effective when the shape of the valve body 4 is not non-straight (non-banded) because the outer notch of the valve body 4 can be formed in a free form.

[0062] As shown in Fig. 3 (C), the cutout of the outer shape of the valve body 4 is changed to the cutout of the outer shape of the base body 3. If it is set to a length that protrudes slightly from the groove 21, even when the cut in the outer shape of the valve body 4 is transferred to the cover stock 13, the position is absorbed even if the position is slightly displaced in the longitudinal direction of the stock. Thus, there is an advantage that the air passage 9 can be reliably formed. If the positions of the cover body 5 and the valve body 4 are shifted, the air passage 9 may be blocked.

[0063] As described above, the degassing valve device according to the present invention can be manufactured with a simple device in a state where the force and quality are constant.

[0064] (4) Other embodiments (FIGS. 4 to 5)

4 and 5 show another embodiment of the gas vent valve device 2. In the example shown in FIG. 4, the adhesive layer 6 is provided on the upper surface and the lower surface of the base body 3, the valve body 4 is attached to the adhesive layer 6 on the upper surface of the base body 3, and the lower surface of the cover body 5 Is adhered to the adhesive layer 6 on the upper surface of the base body 3. In this example, a portion between the cover body 5 and the valve body 4 becomes the air passage 9. Further, the vent hole 8 (through hole) is pierced through the valve body 4 and the base body 3. Even in this form, the valve body 4 is in close contact with the cover body 5 due to its self-adhesiveness, so that a high level and sealing performance can be secured.

When the vent path 9 is configured by the valve body 4 and the cover body 5 as in this example, the self-adhesiveness may be maintained on at least the lower surface of the cover body 5.

[0066] In this case, the valve body is brought into direct contact with the lower surface of the cover body through the self-adhesiveness without interposing the adhesive layer, and the valve body and the base body are in contact with each other. The valve body and the pressure-sensitive adhesive layer have through-holes communicating with the vent holes, so that when the gas is discharged, the package body is bonded to the valve body and the pressure-sensitive adhesive layer. Due to the internal pressure increase, the cover body and the valve body / base body swell and the contact state is released, and an air passage is formed between the cover body and the valve body Z base body. After the gas is discharged, the cover body is drawn onto the valve body Z base body due to a drop in the internal pressure of the package body, and the cover body adheres to the valve body due to the self-adhesiveness of the valve body, and the air passage is The cover body and the valve body are held in close contact with each other.

[0067] In the example shown in Fig. 5 (A), the valve body 4 is formed so that the width decreases from the vent hole 8 toward the tip. If formed in this way, the sealing property can be improved by making it difficult for air to enter. There is no particular limitation on the form of the valve body 4 (in other words, the form of the air passage). For example, zigzag or It is also possible to form a spiral.

In the example shown in FIG. 5 (B), the valve body 4 (ventilation passage 9) is formed in a form extending radially from the vent hole 8, whereas in the example shown in FIG. 5 (C), the valve body is formed. 4 (ventilation passage 9) is formed to extend from the vent hole 8 only in one direction.

[0069] In FIGS. 5D and 5E, the gas vent valve device 2 is formed in a square shape in plan view.

In the example shown in (D), two ventilation holes 8 are formed. In the example shown in (E), the ventilation path 9 extends from the ventilation hole 8 only in one direction. As can be easily understood from FIGS. 5D and 5E, the planar shape of the gas vent valve device 2 and the number of vent holes 8 can be arbitrarily designed. Needless to say, the shape of the vent hole 8 is not limited to a circle but may be a rectangle or a triangle.

In the example shown in FIG. 5 (F), both ends of the valve body 4 are positioned on the periphery of the base body 3, while the cover integrated body 5 is formed to be smaller than the base body 3. As can be seen from this example, the cover unit 5 is sufficient if it has a function of holding the valve body 4 in close contact with the base body 3, and does not necessarily need to completely overlap the base body 3. In addition, even if the cover body 5 and the base body 3 are formed in the same size and shape, the cover body 5 does not completely overlap the base body 3 and may be slightly displaced.

If the cover body 5 is formed to be smaller than the base body 3 as shown in FIG. 5 (F), both ends of the valve body 4 are exposed to prevent the air passage 9 from being blocked. There are advantages. A method of exposing the air passage 9 to the outside of the base body 3 can also be adopted. In this case, the cover body 5 may be the same size as the base body 3.

In the examples shown in FIGS. 5G and 5H, the self-adhesive layer 28 is provided on the upper surface of the base body 3 by means such as applying or bonding. (H) is an enlarged view of a part surrounded by a circle in (G). In addition to the above examples, a plurality of ventilation holes and a plurality of valve bodies are arranged in a single base body in a state of being separated from each other, that is, a plurality of ventilation paths that are not in communication with each other are provided in one valve device. Even what you have set up.

Industrial applicability

[0073] As described above, the present invention solves the problems of the conventional flat type gas vent valve device, has a simple structure, has a high sealing performance without using a liquid sealant, and has a strong force. A degassing valve device that is easy to manufacture and inexpensive to manufacture, and a package equipped with the same Provided.

May be.

Brief Description of Drawings

FIG. 1 is a view showing a first embodiment of a venting valve device of the present invention.

FIG. 2 is a diagram showing a first manufacturing method of the gas vent valve device of the first embodiment.

FIG. 3 is a diagram showing a second manufacturing method of the gas vent valve device of the first embodiment.

FIG. 4 is a view showing another embodiment of the degassing valve device of the present invention.

FIG. 5 is a view showing still another embodiment of the degassing valve device of the present invention.

FIG. 6 is a view showing a conventional gas vent valve device.

Explanation of symbols

[0075] 1 Package (packaging bag)

2 Gas vent valve device

3 Base body

4 Disc

5 Cover body

6 Adhesive layer

7 Gas discharge hole

8 Ventilation holes

9 Airway

Claims

The scope of the claims

A venting valve device that is used by being attached to the surface of a package in order to release the gas generated inside the sealed package,

A sheet-like base body that has a vent hole communicating with a gas discharge hole formed in the package body, and is bonded to the surface of the package body via an adhesive layer;

In order to form a ventilation path for discharging the gas generated inside the packaging body from the vent hole to the atmosphere, the base body has a shape extending at least an upper portion of the vent hole and extending toward an outer edge of the base body. The valve body and the valve body on the base body are not disposed in order to hold and hold the valve body narrower than the base body and the valve body on the base body. And a cover body that covers the entire margin (= exposed part of the base body)

The valve body is self-adhesive and has a resin finer force that is thinner than the base body and the cover body.

When the air passage is formed by a gap formed by the base body and the valve body, the valve body is in direct contact with the base body without the adhesive layer at the air passage formation portion, and is in close contact with the base body. At the same time, the valve body and the cover body are bonded via an adhesive layer provided on the lower surface of the cover body. It is bent and deformed, and the close contact state is released, and a ventilation path is formed between the base body and the valve body / cover integrated body, and gas is discharged from the ventilation path. Due to the internal pressure drop, the valve body / cover unit is drawn onto the base body, and due to the self-adhesiveness of the valve body, the valve body adheres to the base body and closes the air passage, and the valve body and the base body adhere to each other. Held in a state,

When the air passage is formed by a gap formed by the cover body and the valve body, the valve body directly contacts the lower surface of the cover body without an adhesive layer at the air passage formation portion due to its self-adhesiveness. A pressure-sensitive adhesive layer in which the valve body and the base body are provided on the upper surface of the base body while being in close contact with each other The valve body and the pressure-sensitive adhesive layer have through-holes communicating with the vent holes, so that when the gas is discharged, the cover body, the valve body / The base body is bent and the contact state is released, and an air passage is formed between the cover body and the valve body / base body. Gas is discharged from the air passage, and after the gas is discharged, The cover body is drawn onto the valve body Z base body due to a drop in the internal pressure of the package body, and the cover body adheres to the valve body due to the self-adhesiveness of the valve body and closes the air passage. A degassing valve device, which is held in close contact with each other.

[2] Among the resins in which the valve body is self-adhesive by adding an adhesive or tackifier to a polyvinylidene chloride, polyolefin, butyl chloride, or polyvinyl alcohol resin. The degassing valve device according to claim 1, wherein the degassing valve device is a resin film comprising one or more selected from the group consisting of 2 and a thickness of 25 µm or less.

[3] The degassing valve device according to [1], wherein the base body is made of a sheet material having a thickness of 250 to 350 am that is substantially gas permeable.

[4] The base body is a sheet material having a polyethylene terephthalate (PET) force.

3. The venting valve device according to 3.

5. The degassing valve device according to claim 1, wherein the cover body is made of a sheet material having a thickness of 20 to 50 / im that is substantially gas permeable.

6. The degassing valve device according to claim 5, wherein the cover body is a sheet material made of PET.

[7] Claim: A package comprising the degassing valve device according to any one of claims 6 to 6 mounted at a predetermined position on the surface of the package.

[8] The method for producing a venting valve device according to claim 1, wherein a wide valve body raw material is previously laminated on the second release paper, and then only the wide valve body raw material is ventilated. Cut the width of the road (= the equal width of the valve body) and peel off the excess part other than the cut part. After forming the narrow valve stock on the second release paper, The first release paper Z base body is a process that forms a layered body consisting of a narrow valve body raw material / cover raw material by transferring the second raw material for the valve body to the cover body raw material. A step of forming through holes in the laminate made of the raw material at predetermined intervals, the first release paper / base material through which the air holes are formed, and the narrow valve material raw material / Laminate the laminate made of the raw material for hips , A step of forming a laminated body comprising a first release paper / a base fabric / a narrow valve stock / a cover integrated fabric, for a cover body other than the first release paper in the laminate Cut through the outer shape of the base body (= the outer shape of the cover body) concentrically with the vent hole, through the layers of the original fabric / narrow body for the valve body and the base fabric for the base body. The step of forming the outer shape (= the outer shape of the cover body) and the gas release valve on the first release paper by peeling off the original fabric portion other than the cut-out outer shape from the first release paper A method for producing a venting valve device, comprising the step of forming the device.

The method for manufacturing a venting valve device according to claim 1, wherein the first release paper Z base is formed by passing through a vent hole at a predetermined interval in a laminate made of a Z base material, and the second release paper A step of cutting the outer shape of the valve body into the attached original body for the valve body, concentrically with the vent hole only in the original fabric, for valve bodies other than the outer shape forming band of the cut-out valve body A process for obtaining a second release paper having the outer shape of the valve body formed by peeling the original fabric portion from the second release paper, and for the cover body from the second release paper having the outer shape of the valve body formed. A step of transferring and affixing the outer portion of the valve body to the original fabric, and a first peeling in which a vent hole is penetrated at the predetermined interval on the original material for the cover body on which the outer shape portion of the valve body is transferred and attached A cover body in which a laminate of paper / base material is laminated to form the first release paper / base material / valve outer shape. A step of forming a laminated body made of the raw fabric, the base material in the laminated body / the base material for the cover body in which the outer portion of the valve body is formed, and the base concentrically with the vent hole A step of cutting the outer shape of the body (= the outer shape of the cover body), and a gas release valve device on the release paper by pulling off the first release paper force other than the cut-out outer shape. A method for manufacturing a venting valve device, comprising the step of: