JP2004250093A - Packaging body, valve device to be used for the same, and manufacturing method of valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a valve device have a form that enables to exhibit a high degree of checking effect while being low in cost, with respect to the valve device provided on a packaging container body or its lid or a packaging bag. <P>SOLUTION: The valve device 4 constitutes of a valve body 5 made of an impermeable, soft, thin film and a connecting portion 6 formed on the lower surface of the valve body. The connecting portion 6 is comprised of, for example, a double-faced adhesive tape, which is formed along the periphery rim of the valve body 5 in a non-loop shape. This allows the inside of the connecting portion 6 to be a ventilation passage 9. The exit portion 9a of the ventilation passage 9 is made a constricted path with narrow width while the ventilation passage 9 is extended non-linearly with a branching portion 5a formed in the connecting portion 6 in the direction toward inside the ventilation passage. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a package, a valve device used for the package, and a method for manufacturing the valve device.
[0002]
[Prior art]
There are articles (products) that generate gas such as carbon dioxide gas by fermentation or the like, such as miso, grains, and beans such as coffee beans and soybeans. When packaging such a gas-producing article in a container or bag, it is necessary to remove the generated gas in order to prevent the container or bag from bursting due to internal pressure and maintain the quality of the contents. is there.
[0003]
However, a mere opening of the ventilation hole in the lid or bag of the container may cause foreign matter such as dust and small insects to enter. In addition, in the case of fermented foods such as miso, it is preferable to minimize the intrusion of air (oxygen) to maintain quality. Therefore, various valve devices having a check function have been proposed.
[0004]
For example, in Patent Literature 1, a valve device includes a rigid ring-shaped base plate attached to the surface of a bag and a flexible valve film (diaphragm) attached to the surface of the bag device. It is described that a ventilation path is formed between the base plate and the base plate.
[0005]
Patent Literature 2 discloses a valve device including a base film having rigidity and a ring shape, and a flexible valve film attached to the surface of the base film. The formation is described.
[0006]
Further, Patent Literature 3 discloses a valve device disposed on the lower surface (inner surface) of a lid of a container. The valve device has a bottomed cylindrical shape with an upward opening and a flange at an upper end, and is fitted into the inside of the valve body. It describes that a vent hole is made in the bottom of the valve body and the vent hole is closed with a valve film from above as a structure comprising the valve film and the push plate.
[0007]
[Patent Document 1]
JP-A-56-32239
[Patent Document 2]
JP-A-6-57861
[Patent Document 3]
JP-A-62-23253
[0008]
[Problems to be solved by the invention]
As described above, the essential function of this type of valve device is a function of reliably releasing gas generated inside a container or a bag and a function of preventing entry of foreign matter (or oxygen) as much as possible. Other important factors include easy handling and cost reduction. However, the prior art has a problem in this respect.
[0009]
That is, when the valve device is attached to the sheet-like lid that seals the container, it is necessary to press the valve device with a certain force, so it is necessary to attach the valve device to the lid in advance before the packaging process. However, since the overall thickness of each of the prior arts is large, if a large number of lids to which the valve device is attached are stacked, the stability is deteriorated, and there is a possibility that handling in the transportation and the packaging process becomes troublesome.
[0010]
Further, as a method for efficiently sealing the container with a lid made of paper or the like, a method in which the raw material of the lid wound in a roll shape is fixed to the upper surface of the container with a hot melt adhesive or the like, and then the raw material is cut. However, since the conventional valve device is bulky and cannot be attached to the material of the lid in advance, there has been a problem in that it cannot be applied to a method of directly fixing the material of the lid to the container.
[0011]
Further, the cost tends to be high because the structure tends to be complicated. Particularly, in the case of Patent Document 3, the number of components is large and an assembling step is required, so that the problem of high cost is particularly remarkable.
[0012]
An object of the present invention is to improve such a situation.
[0013]
[Means for Solving the Problems]
The present invention includes a valve device, a manufacturing method thereof, and a package using the valve device. In the present invention, the package is a general term for a package body, a lid for closing the body, and a packaging bag. Of course, these packages are made of non-breathable materials. In the present invention, it is not necessary to strictly use adhesion and adhesion.
[0014]
The invention according to claim 1 relates to a valve device, comprising a valve body made of a thin material that is flexible and non-permeable, and a joint provided on one surface of the valve body for fixing the valve body to a surface of a package. The joint is formed in a non-loop shape along the outer periphery of the valve body and excluding only a part of the entire periphery, so that the inner part surrounded by the joint is a ventilation path. Has formed.
[0015]
The invention according to claim 2 is the method according to claim 1, wherein the outlet part of the ventilation path that is open to the atmosphere is formed as a narrow narrow path, and the bonding part is formed of an adhesive layer. By forming one or more inward protrusions extending toward the inside, the ventilation path is formed in a non-linear manner.
[0016]
According to a third aspect of the present invention, in the first or second aspect, the joint is formed of an adhesive layer, and adheres to the surface of the package body at a portion of one surface of the valve body surrounded by the joint. The auxiliary film is integrally bonded, and the portion of the auxiliary film is used as a ventilation path.
[0017]
After the contents are packaged in a container or bag, it is possible to attach the valve device to the lid or the packaging bag. It is preferable to attach it to the package in advance.
[0018]
For example, welding or hot melt adhesive can be used as a specific mode of the joint portion constituting the valve device. In this case, a device such as a hot plate, a high frequency or an ultrasonic horn is required. Further, the materials of the valve device and the package are limited. On the other hand, it is preferable to use a pressure-sensitive adhesive as the joining portion as in claims 2 and 3 because it can be easily attached.
[0019]
An example of a method of manufacturing the valve device according to claim 3 is described in claim 5. That is, this manufacturing method includes a step of adhering a self-adhesive auxiliary film raw material such as a wrap film to a release paper (release film) raw material, and a step of applying the air passage to the auxiliary film raw material adhered to the release paper raw material. A step of cutting and forming a pattern of the shape of, and a step of peeling off a blank portion of the auxiliary film raw material so that only the pattern of the ventilation path remains on the release paper raw material, and a step of exposing the exposed path of the ventilation path pattern and the release paper raw material. A step of laminating the substrate film raw material with an adhesive, a step of forming a cut in the shape of the valve body in the substrate film raw material, and a step of peeling off a blank portion of the substrate film raw material I have.
[0020]
As described in detail in the embodiment, the step of laminating the base film raw material serving as the valve body to the release paper raw material with an adhesive so as to cover the air passage pattern is performed by applying an adhesive. There is a mode in which the raw material film is bonded, and a mode in which a single-sided pressure-sensitive adhesive tape having a pressure-sensitive adhesive layer formed on one side is used.
[0021]
In this manufacturing method, the valve device is manufactured as an intermediate product in which a large number of the valve devices are attached to release paper. Therefore, in use, the valve device is peeled off from the release paper and attached to the package.
[0022]
The invention according to claim 6 relates to a package to which a valve device is attached, and the package has a ventilation hole penetrating from front to back.
[0023]
On the other hand, the valve device includes an auxiliary film that overlaps the surface of the package in a state where the ventilation hole is closed, and a valve body made of a synthetic resin film that is covered with the auxiliary film and bonded to the package with an adhesive layer interposed therebetween. The valve device is provided with ventilation means for communicating the ventilation hole with the atmosphere, and at least one of the auxiliary film of the valve device and at least the surface layer of the package, It consists of a self-adhesive film such as a wrap film.
[0024]
[Action and Effect of the Invention]
Since the present invention has a simple structure in which a joint portion such as an adhesive layer is provided on a valve body made of a flexible material such as a resin film (or a resin sheet), it can be manufactured at low cost. In addition, since the overall thickness can be reduced, a large number of container lids to which the valve device is attached can be stably stacked, and as a result, the lid can be transported and packaged in the same manner as when the valve device is not attached. It can be handled without any trouble in the process.
[0025]
Further, when the lid is made of a thin sheet of paper or the like, since it is possible to attach a valve device to the raw material of the lid in advance and wind it in a roll shape, seal the container while feeding the raw material of the lid. It can be applied to various sealing methods.
[0026]
According to the second aspect of the invention, the fact that the outlet of the ventilation path is a bottleneck and the ventilation path is non-linear combine to effectively prevent foreign matter from entering without impairing the exhaust function. be able to. In addition, when the joining portion is formed of an adhesive (pressure-sensitive adhesive), the valve device can be attached to the package simply by pressing down, so that there is an advantage that the attachment can be easily performed.
[0027]
According to the structure of the third aspect, the auxiliary film can be held in a state in which the auxiliary film is in close contact with the surface of the package, so that also in this case, the invasion of foreign matter or air can be accurately prevented. When the provision of the auxiliary film in this manner is combined with the provision of the outlet of the air passage as a bottleneck and the formation of the air passage in a non-linear manner, the check effect is further improved.
[0028]
By the way, wrap films are used for simple packaging and preservation of foods. As the wrap film, a vinylidene chloride (PVDC) film, a polyethylene film, a vinyl chloride film, or the like is used. Further, as a film having excellent gas barrier properties (particularly, oxygen permeation blocking properties), there is a polyvinyl alcohol ethylene copolymer (EVOH) film.
[0029]
These wrap films and EVOH films have a self-adhesive property that is lightly adhered to the surface of a mating material. And when comprised like Claim 5 or Claim 6, an auxiliary film can be stuck or closely contacted with a package, and a non-return function can be improved remarkably.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
[0031]
(1). First embodiment (FIGS. 1 to 5)
1 to 5 show a first embodiment. FIG. 1 is a perspective view of a used state, and as shown in FIG. 1, the present embodiment is applied to a packaging container for miso. The packaging container includes a main body 1 having a flange 1a formed at an opening edge thereof, and a lid 2 adhered or welded to the flange 1a of the main body 1 (furthermore, a detachable ear may provide a cover. ).
[0032]
FIG. 2A is a partial perspective view of the lid 2, and a very small ventilation hole 3 is opened in an appropriate portion of the lid 2. The valve device 4 is attached so as to cover the ventilation hole 4.
[0033]
FIG. 2B is an exploded perspective view of the valve device 4. As can be easily understood from this figure, the valve device 4 is composed of a valve body 5 having a rectangular shape in plan view and a joining portion 6 provided on the lower surface thereof. Made up of The joining portion 6 is made of a double-sided adhesive tape 7 having an adhesive layer 8 on both front and back sides, and is adhered to the valve body 5 by the adhesive layer 8 on one side. Both the base material of the valve body 5 and the base material of the double-sided adhesive tape 7 are made of a resin film such as polyethylene, polypropylene, or PET.
[0034]
3 is a plan view of a main part in a use state, FIG. 4 (A) is a sectional view taken along the line IV-IV in a state where the valve device 4 of FIG. 3 is separated, and FIG. 4 (B) is a view taken along the line IV-IV of FIG. 5A and 5B are cross-sectional views taken along line V-V in FIG. 3.
[0035]
The joint 6 of the valve device 4 extends along the peripheral edge of the valve body 5 and is formed in a non-loop shape, so that the inside surrounded by the joint 6 is provided with a ventilation passage 9 having an outlet 9a. And
[0036]
The outlet portion 9a is a narrow path narrower than the back side and formed so as to be biased toward one longitudinal side surface 5a of the valve main body 5, and further, one longitudinal side surface 5a of the valve main body 5 in the joint portion 6. A portion closer to the inner side than the outlet portion 9 a integrally forms a branch portion 6 a extending toward the inside of the ventilation passage 9.
[0037]
The branch portion 6a is inclined so as to approach the outlet side as it approaches the tip. Further, a portion of the inner peripheral surface of the ventilation passage 9 facing the branch portion 6a is an inclined portion 6b inclined toward the outlet portion 9a. For this reason, the ventilation path 9 extends and bends (meanders) in a non-linear manner.
[0038]
The lid 2 has a multilayer structure in which, for example, an aluminum foil for a gas barrier is provided on the back surface of a base layer made of paper. A synthetic resin film may be laminated on the surface of the base layer. In any case, the thickness of the lid 1 is considerably thicker than the valve device 4 (of course, the thickness of the lid 2 and the valve device 4 can be set arbitrarily).
[0039]
The ventilation hole 3 of the lid 2 is formed, for example, by inserting a needle from the front side. For this reason, the periphery of the ventilation hole 3 does not rise to the surface side, and the valve body 5 can be in close contact with the surface of the lid 2 (may be punched).
[0040]
In the above configuration, when the gas is generated in the container and the internal pressure becomes higher than the atmospheric pressure, the gas passes through the ventilation passage 9 so as to push up the valve body 5 and to the atmosphere as shown in FIG. Released.
[0041]
When the pressure in the container becomes equal to the atmospheric pressure after the gas has completely escaped, the valve body 5 is in close contact with or close to the surface of the lid 2 as shown in FIG. 4 (B) or FIG. 5 (A). Therefore, it is possible to prevent or significantly suppress foreign substances from entering the ventilation hole 3 through the ventilation path 9 and preventing air (oxygen) from flowing back into the container.
[0042]
In particular, since the outlet 9a of the ventilation path 9 is a bottleneck, and the branch 6a is formed at the joint 6 and the ventilation path 9 is meandering, the check effect is remarkably improved. Since the height is higher, the invasion of foreign matter can be more accurately prevented.
[0043]
In this case, when the branch portion 6a is inclined as in the present embodiment and the portion of the joining portion 6 facing the branch portion 6a is formed in the inclined portion 6b, the gas is smoothly released. While being guided, it is preferable because invasion of foreign matter and oxygen can be more accurately prevented. It is preferable that the valve body 5 and the joining portion 6 have an appropriate thickness so as to increase the adhesion to the lid 2.
[0044]
By the way, for example, in Patent Document 1, a rigid base is used for a valve device because a valve or a bag is deformed so that the diaphragm is kept in close contact with the base so that the non-return effect is not maintained. Conceivable.
[0045]
On the other hand, when the container main body 1 is manufactured by vacuum molding or injection molding, the lid 2 welded to the main body 1 is kept in a taut state, and does not significantly deform before opening. Therefore, when the pressure inside the container 1 is the same as the atmospheric pressure, the valve body 5 is held in close or close contact with the surface of the lid 2, and the check effect is not impaired.
[0046]
That is, in the present invention, the simple structure in which the joint portion 6 is provided on the valve body 5 can ensure the non-return effect of preventing intrusion of foreign matter and oxygen by the cooperative action with the lid 2. The material and structure of the lid 2 are not limited, and it goes without saying that, for example, a material obtained by vacuum forming a synthetic resin sheet as a material may be used.
[0047]
In attaching the valve device 4 to the lid 2, as shown by a two-dot chain line in FIG. 4A, a portion of the lid 2 where the valve body 5 overlaps may be curved in an upwardly convex shape. By doing so, the valve body 5 can easily adhere to the surface of the lid 2 in a state where the lid 2 is flat, so that an improvement in the check function can be expected.
[0048]
(2). Second embodiment (FIGS. 6 and 7)
Next, a second embodiment, which is a method for manufacturing the valve device 4 according to the first embodiment, will be described with reference to FIGS.
[0049]
In the second embodiment, as shown in FIG. 6 (A), a double-sided pressure-sensitive adhesive tape 12 having a pressure-sensitive adhesive layer 8 formed on the entire front and back surfaces of a belt-shaped synthetic resin film is used as a material of the bonding portion 6. . A release paper (release paper) 13 coated with a release agent such as silicone is applied to the front and back adhesive layers 8 of the double-sided adhesive tape raw material 12.
[0050]
Then, as shown in FIG. 6 (B), a double-sided adhesive tape raw material 12 having release paper 13 stretched on both front and back surfaces is fed out in the longitudinal direction, and is punched by a punching means (not shown) such as a Thompson or a press. Then, the window holes 14 serving as the ventilation paths 9 are pulled out at predetermined intervals.
[0051]
Then, as shown in FIG. 6 (C), one of the release papers (the release paper on the lower surface side in the figure) 13 is peeled off to expose one (lower surface side) of the adhesive layer 8 on the raw material 12 for the double-sided adhesive tape. Another release paper 13 is attached to this.
[0052]
Next, the other release paper 13 having the window hole 14 is peeled off to expose the other (upper side) adhesive layer 8 in the double-sided adhesive tape raw material 12, and then, as shown in FIG. Then, a strip-shaped base material film 15 serving as a material of the valve body 5 is bonded to the exposed one adhesive layer 8.
[0053]
Then, as shown in FIG. 7 (E), cuts 16 having the shape of the valve body 5 are formed in the base film raw material 15 and the double-sided adhesive tape raw material 12 by Thomson (not shown). (F) is a sectional view taken along line FF of (E), and the cut 16 is not formed in the raw release paper 13.
[0054]
Then, as shown in FIG. 7 (G), the frame-shaped blank portion (unnecessary portion) 15a of the base film raw material 15 excluding the valve body 5 and the blank portion 12a of the double-sided tape raw material 12 are put together. Peel off in a stack. As a result, as shown in FIG. 7H, an intermediate product 17 in which a number of valve devices 4 are arranged in a row on a single release paper web 13 is manufactured. In general, this intermediate product is shipped in a roll shape, and the valve device 4 is peeled off from the intermediate product 17 one by one and attached to the lid 2.
[0055]
As is clear from FIGS. 7 (E) to 7 (H), the window hole 14 is formed so as to be slightly extended from the outlet portion 9a of the air passage 9. For this reason, even if there is some error in the feeding of the material in the cutting process by Thomson, the outlet portion 9a can be reliably formed without closing the ventilation path 9.
[0056]
As described above, the valve device 4 can be easily mass-produced using the double-sided adhesive tape raw material 12 and the base film raw material 15. Note that the above steps may be performed in series or may be performed in a state of being separated into several steps. Further, it is also possible to manufacture a multi-stage intermediate product 17 in which the valve devices 4 are arranged in a plurality of rows on a single release paper web 13 using a wide material film.
[0057]
(3). Third embodiment (FIG. 8)
FIG. 8 shows a third embodiment. (A) is a plan view in a use state, and (B) is a cross-sectional view taken along line BB of (A).
[0058]
This embodiment is a simple form in which the joining portion 6 does not have a branch portion, and the narrow outlet portion 9a is formed at the position of the center line of the valve main body 5 (of course, both longitudinal side edges are formed). It may be biased to either). The joint 6 is made of a double-sided adhesive tape and is manufactured by the same method as in the second embodiment.
[0059]
(4). Fourth to sixth embodiments (FIG. 9)
FIG. 9 shows another example in which the joining portion 6 is provided with a branch portion 6a. In the fourth embodiment shown in (A), two branch portions 6a extending in opposite directions are formed. When formed in this manner, the ventilation path 9 becomes zigzag, so that the check function is further improved.
[0060]
In the fifth embodiment shown in (B), the branch portion 6a is formed to extend right beside. In the sixth embodiment shown in (C), the outlet 9a is opened on one longitudinal side surface 5a of the valve body 5.
[0061]
(5). Seventh and eighth embodiments (FIG. 10)
The planar shape of the valve device 4 can be set arbitrarily. FIG. 10 shows an example in which the valve device 4 is formed in a circular shape. In the seventh embodiment shown in (A), the joint 6 is formed so as to extend along the circumference of the valve body 5 with substantially the same width. Thus, the gas is emitted in a radial direction.
[0062]
In the eighth embodiment shown in (B), the branch-like portion 6a is formed at one end of the joint portion 6 so that the narrow outlet portion 9a extends substantially in the tangential direction of the valve body 5. . In this embodiment, since the length of the ventilation path 9 is increased, it is considered that the airflow path 9 is excellent in the check function.
[0063]
(6). Ninth embodiment (FIG. 11)
FIG. 11 shows a ninth embodiment. This embodiment has the same configuration as the third embodiment of FIG. 8 and shows a method of manufacturing the valve device 4 in which the joint portion 6 is simply formed of the adhesive layer 8 (it goes without saying that the valve device 4 can also be applied to the configuration of the first embodiment). ).
[0064]
(A), (C), and (D) are views showing steps, (B) is a plan view as viewed from the line BB in (A), (E), (F), and (G) are views from the line EE in (D). It is -F view and GG view.
[0065]
In this embodiment, a strip-shaped base material film 15 serving as the valve body 5 is used. First, as shown in (A) and (B), ((B) is a BB view of (A). The pattern of the adhesive layer 8 serving as the joining portion 6 is formed on one surface of the base film raw material 15 by a printing means such as a rotary silk screen printing machine 18 while feeding the base film raw material 15 in the longitudinal direction. It is applied sequentially at appropriate intervals.
[0066]
In this case, the pattern of the adhesive layer 8 is formed to be slightly wider so as to protrude outside the actual joint 6. The base film raw material 15 is slightly wider than the valve body 5.
[0067]
Next, as shown in (C), the release paper raw 13 is overlaid on one side of the base film raw 15 to cover the adhesive layer 8 with the release paper raw 13. Then, as shown in (D), the cut 16 of the outer shape of the valve body 5 is formed in the base film raw material 15 by Thomson 20, and then the valve body 5 is removed from the base film raw material 15. The frame-like unnecessary portion 15a is peeled off from the release paper web 13.
[0068]
An excess portion of the adhesive layer 8 is removed together with an excess portion of the base film raw material 15, and only the valve device 4 remains in the release paper raw material 13.
[0069]
In this embodiment, since the joining portion 6 is formed only of the adhesive layer, the process can be simplified, and the amount of members used can be reduced to further reduce the cost. Further, since the valve device 4 becomes thinner as a whole, the close contact with the lid 2 and the bag can be enhanced, and the check effect can be further improved.
[0070]
As a method of applying the adhesive layer to the base material film 15, a method such as application using a dispenser can be adopted instead of using a printing device.
[0071]
(7). Tenth embodiment (FIG. 12)
FIG. 12 shows a tenth embodiment. (A) is a plan view of the intermediate product 17, (B) is a plan view using the valve device 4, (C) is a cross-sectional view taken along the line CC of (A), (D) is (B). It is DD sectional view taken on the line.
[0072]
In this embodiment, an adhesive layer 8 is formed on the entire lower surface of the valve body 5, and an auxiliary film 22 made of a synthetic resin to be the ventilation path 9 is attached to the lower surface of the valve body 5. Therefore, the portion of the adhesive layer 8 exposed outside the auxiliary film 22 becomes the joint 6. In the intermediate product 17, the valve device 4 is affixed to the release paper web 13.
[0073]
In this embodiment, since the auxiliary film 22 is pressed against the surface of the lid 2 by the valve main body 5, the check valve function can be further improved. Therefore, the outlet 9a of the ventilation path 9 does not necessarily have to be a bottleneck. As shown by a dashed line in (D), the air passage 9 may be formed in a trapezoidal shape in plan view (the same applies to other embodiments). As the auxiliary film 22 in this example, for example, a polyethylene film or a polypropylene film can be used (a wrap film may be used).
[0074]
A method of manufacturing the valve device 4 according to the tenth embodiment will be described based on (E) and (F). The valve device of this embodiment uses a single-sided adhesive tape having an adhesive layer 8 coated on one side in advance as a base film raw material 15, and while feeding out the base film 15 in its longitudinal direction, the auxiliary film The web 23 is layered on the entire surface of the adhesive layer 8.
[0075]
The auxiliary film raw 23 is applied in a releasable state to the adhesive layer 8 of the base film raw 15 by applying a release agent having a low releasing effect or the like.
[0076]
Next, a notch of the outer shape of the auxiliary film 22 is formed in the auxiliary film raw 23 by the Thomson 20, and then a blank portion 23a of the auxiliary film raw 23 is peeled off.
[0077]
Then, the adhesive layer 8 is protected by stacking the release paper web 13, and then the cuts of the outer shape of the valve body 5 are sequentially cut into the base film web 15, and then, of the base film web 15, A blank portion (unnecessary portion) 15 a excluding the valve body 5 is peeled off from the release paper web 13. Thereby, the intermediate product 17 shown in FIG.
[0078]
Instead of providing the auxiliary film 22, other anti-adhesion means such as application of printing ink may be employed. Needless to say, the bonding portion 6 made of the adhesive layer may have a form including the branch portion 6a as in the first embodiment.
[0079]
(8). Eleventh embodiment (FIG. 13)
FIG. 13 shows an eleventh embodiment. (E) is a plan view of the intermediate product, and (F) is a front view of the intermediate product in a state where one valve device 4 is peeled from the release paper web 13. As can be understood from these drawings, the valve device is shown. 4 includes an auxiliary film 22 serving as the air passage 9, similarly to the embodiment of FIG. 12, and the joint 6 includes the adhesive layer 8.
[0080]
As a feature of this embodiment, a wrap film used for wrapping food or the like or an EVOH film is used as the auxiliary film 22. The junction 6 has a branch 6a. Next, the manufacturing method will be described based on (A) to (D). (B) is a BB plan view of (A).
[0081]
First, as shown in (A), while releasing the release paper raw material 13 in the longitudinal direction, the auxiliary film raw material 23 having self-adhesiveness is overlapped on the release paper raw material 13 and both are brought into close contact with the roller pair 24. . For this reason, the auxiliary film 23 is in a state of being stuck to the release paper web 13.
[0082]
Then, as shown in (B), the cuts 16 having the shape of the auxiliary film 22 are sequentially formed only in the auxiliary film raw 23 by the Thomson 20, and then the auxiliary film 22 in the auxiliary film raw 23 is formed. The removed margin portion 23a is peeled off. Therefore, only the auxiliary film 22 remains in the release paper raw material 23 in a state of jumping.
[0083]
Next, as shown in (C), the exposed portion of the release paper web 13 and the auxiliary film 22 are coated with the adhesive layer 8 by a coating device 26 such as a rotary type. The base film raw material 15 is laminated.
[0084]
Then, as shown in (D), a cut having the shape of the valve body 5 is formed in the raw substrate film 15 with a Thomson 20 and then the blank portion 15a of the raw substrate film 15 is peeled off. Thereby, the intermediate product shown in (E) is obtained. Note that a part of the auxiliary film 22 is also removed.
[0085]
The valve body 5 preferably has a certain degree of stiffness in terms of ease of handling. Specifically, a thickness of about 25 to 50 μm is suitable. The auxiliary film 22 may be, for example, about 10 μm (of course, it may be thinner or thicker).
[0086]
(9). Twelfth embodiment (FIG. 14)
FIG. 14 shows the manufacturing method of the twelfth embodiment. This manufacturing method relates to a method of manufacturing the valve device 4 with the auxiliary film 22 using a single-sided adhesive tape. In this manufacturing method, first, as shown in (A), an auxiliary film raw material 23 made of a self-adhesive material is brought into close contact with the release paper raw material 13 while feeding the release paper raw material 13 in the longitudinal direction. Go.
[0087]
Then, a cutout of the shape of the auxiliary film 22 is formed only in the auxiliary film raw 23 by the Thomson 20, and then the blank portion 23a of the auxiliary film raw 23 is peeled off. Therefore, a state similar to that of FIG.
[0088]
Then, as shown in (B), the substrate film raw material 15 coated with the adhesive layer 8 on one side is bonded to the exposed surface of the release paper raw material 13 and the entire auxiliary film 22. Next, a cut in the shape of the valve body 5 is formed in the raw material film 15, and then the blank portion 15 a of the raw material film 15 is peeled off.
[0089]
Thus, an intermediate product similar to that of FIG. 13E is obtained. This production method has an advantage that the production efficiency can be improved because the number of steps is small. In the present embodiment (and other embodiments), an intermediate product in which the valve devices 4 are arranged in a line is manufactured, but it goes without saying that the valve devices 4 can be manufactured in a state in which the valve devices 4 are arranged in a plurality of lines.
[0090]
(10). Thirteenth embodiment (FIG. 15)
FIG. 15 shows a thirteenth embodiment. (A) is a sectional view, and (B) is a plan view. In the valve device 4 of this embodiment, the entire auxiliary film 22 is covered with the valve body 4, and therefore, the joint 6 formed of the adhesive layer 8 extends over the entire circumference of the valve body 5. The auxiliary film 22 is made of a self-adhesive material film. The surface layer 2a of the lid 2 is also made of a material having self-adhesiveness.
[0091]
A small hole 27 that penetrates the valve body 5 and the auxiliary film 22 is formed at an end of the valve device 4 as a ventilation unit. As the exhaust means, a cut may be formed instead of the small hole 27 (it can be said that the cut has a higher foreign matter mixing prevention function).
[0092]
In this embodiment, the valve device 4 is mounted on the lid 2 with the small holes 27 as far as possible from the ventilation holes 3 of the lid 2. Then, when gas is generated inside the container, the auxiliary film 22 is pushed up by the pressure, whereby the gas is diffused from the small holes 27 to the atmosphere. It is sufficient if only one of the auxiliary film 22 and the surface layer 2a of the lid 2 is formed of a self-adhesive film.
[0093]
In general, as described above, when the lid 2 is made of paper as a base material, an aluminum foil is often adhered to the lower surface in order to secure gas barrier properties. When the surface layer is composed of a self-adhesive film, the self-adhesive film has a high gas barrier property, so that an aluminum foil can be eliminated.
[0094]
By the way, in the case of a paper lid, a hot melt adhesive is applied to the back surface (lower surface) of the peripheral portion, and the lid 2 is bonded to the container by applying a seal bar (hot plate) to the upper surface of the lid. In this case, if a resin film is laminated on the surface of the lid 2, it is considered that the adhesion to the valve device 4 can be increased and the check effect can be improved.
[0095]
In that case, various resin films can be selected, and when these are classified according to the properties of the materials, for example, (1) a low melting point film such as vinyl chloride or polyethylene, and (2) PP, PET, High melting point resin such as nylon, PVDC and EVOH, (3) EVOH, PVDC, nylon and PET which are excellent in oxygen (gas) barrier, and (4) PP and PE having low oxygen barrier properties, and (5) self-adhesion PVDC, EVOH, PE, PVC and other resins having excellent properties are classified into (6) those containing chlorine such as vinyl chloride and resins not containing chlorine such as EVOH.
[0096]
And, the resin containing chlorine has a problem of occurrence of radish due to incineration treatment after disposal, and it is preferable to avoid using the resin as much as possible. On the other hand, a resin having a low melting point, such as PE, has a problem that the resin is melted and stained when applied to the seal bar, and thus is difficult to use.
[0097]
On the other hand, when a material having a high melting point and excellent self-adhesiveness and containing no chlorine, such as EVOH, is used, the valve device is not melted by the heat of the seal bar and the environment is not impaired in the treatment after disposal. There is an advantage that a high non-return effect can be obtained by securing the sealing performance of the device.
[0098]
(11). Reference example (FIG. 16)
FIG. 16 shows a reference example. In this reference example, the valve device 4 has a laminated structure in which three films of a first valve body 28, a second valve body 29, and a third valve body 30 are laminated in order from the table. A ring-shaped spacer 31 is attached to the three-valve element 30 with an adhesive or an adhesive.
[0099]
The first valve body 28 and the third valve body 30 are made of a film having a certain degree of rigidity, and the second valve body (auxiliary film) 29 is made of a thin film having self-adhesiveness. Further, the second valve body 29 is bonded to the first valve body 28 over the entire surface, and is bonded to the third valve body 30 only at the peripheral portion.
[0100]
As a part of the ventilation means, a first small hole 32 communicating with each other is formed in the first valve body 28 and the second valve body 29, and a second small hole 33 is formed in the third valve body 30. The small holes 32 and 33 are shifted so as not to overlap (preferably, they are spaced as much as possible). The joint 6 (adhesive layer 8) is formed on the spacer 28.
[0101]
In this reference example, an air passage is provided between the second valve body 29 and the third valve body 30 as a part of the ventilation means. It escapes to the first small hole 29. Since the distance between the small holes 32 and 33 is constant, a constant check effect can be obtained irrespective of the position of the ventilation hole 3 (that is, regardless of the mounting position of the valve device 4).
[0102]
It is also possible to replace both or either of the small holes 32, 33 with cuts. Alternatively, the entire surface of the second valve body 29 may be bonded to the third valve body 30 to form an air passage between the first valve body 28 and the second valve body 29. Further, the second valve body 29 may be bonded to both the first valve body 28 and the third valve body 30 only at the peripheral portion.
[0103]
The planar shape of the valve device 4 can be formed into various shapes such as a circle and a square. The spacer 28 is not necessarily required, and an annular joint (adhesive layer) may be formed on the third valve body 30. In addition, in this example, since the check effect is obtained by utilizing the adhesion due to the lamination of three or more valve bodies, the second valve body 29 does not necessarily need to be made of a film having self-adhesiveness.
[0104]
Further, a structure in which four or more valve bodies are stacked may be employed. For example, as a laminated structure of the first to fourth valve bodies, the second valve body and the third valve body are made of a film having self-adhesiveness, and a ventilation path is provided between the second valve body and the third valve body. It is considered that the formation of a non-woven fabric can exert an excellent non-return effect. As a fixing means between the valve bodies, welding may be performed instead of adhesion with an adhesive (or an adhesive).
[0105]
(12). Other
The present invention can be embodied in various ways other than the above-described embodiment. The planar shape of the valve body is not limited to a square or a circle, and various shapes such as an ellipse and a star can be adopted. It is also possible to join the valve body to the lid by welding. Further, the valve device of the present invention can be applied to containers and bags made of various materials. For example, it can be applied to a canned lid.
[0106]
When using a self-adhesive film as an auxiliary film and attaching it to a paper lid, using a highly smooth material such as coated paper as the lid material can improve the sealing function. . In addition, if the valve device and the package are too close to each other, gas escape becomes worse, so that the properties (mainly, surface roughness) of the surface layer of the package and the auxiliary film may be selected as appropriate as needed. .
[0107]
When a self-adhesive film is used as an auxiliary film, it is not always necessary to attach it to the base film with an adhesive, and the self-adhesive film may be used to integrate the base film with the base film. The auxiliary film does not fall off).
[Brief description of the drawings]
FIG. 1 is a perspective view of a use state of a first embodiment.
FIG. 2A is a partial perspective view of a lid, and FIG. 2B is an exploded perspective view of a valve device.
FIG. 3 is a plan view of a main part in a use state.
FIG. 4 is a sectional view taken along the line IV-IV in a state of not being separated from a separated state of FIG. 3;
FIG. 5 is a sectional view taken along line VV of FIG. 3;
FIG. 6 is a view showing a process of the second embodiment.
FIG. 7 is a view showing a process of the second embodiment.
FIG. 8 is a diagram showing a third embodiment.
FIG. 9 is a diagram showing fourth to sixth embodiments.
FIG. 10 is a view showing a seventh to an eighth embodiment.
FIG. 11 shows a ninth embodiment.
FIG. 12 is a diagram showing a tenth embodiment.
FIG. 13 is a diagram showing an eleventh embodiment.
FIG. 14 is a diagram showing a twelfth embodiment.
FIG. 15 is a view showing a thirteenth embodiment.
FIG. 16 is a diagram showing a reference example.
[Explanation of symbols]
1 Body of miso container
2 Lid as an example of a package
3 ventilation holes
4 Valve device
5 Valve body
6 Joints
6a Branch
7 Double-sided adhesive tape
8 Adhesive layer
9 Ventilation path
9a Exit
12 Double-sided adhesive tape
13 Release paper stock
15 Base film raw material
16 Cut

Claims (6)

A valve device for covering a vent hole opened in a package such as a main body or a lid or a packaging bag of a packaging container,
A valve body made of a thin material that is flexible and air-impermeable, and a joint provided on one surface of the valve body to fix the valve body to the surface of the package,
By forming the joining portion in a non-loop shape along the outer periphery of the valve body and removing only a part of the entire periphery, an inner portion surrounded by the joining portion forms an air passage. Valve device for packaging. The outlet of the ventilation path, which is open to the atmosphere, is formed as a narrow bottleneck, and the joint is formed of an adhesive layer.The joint has one inward protrusion extending toward the inside of the ventilation path. The valve device for a package according to claim 1, wherein the ventilation path is formed in a non-linear shape by forming a plurality of the ventilation paths. The joining portion is formed of an adhesive layer, and an auxiliary film that is in close contact with the surface of the package is integrally bonded to a portion of one surface of the valve body that is surrounded by the joining portion, and the portion of the auxiliary film is ventilated. The valve device for a package according to claim 1 or 2, wherein the valve device forms a path. A main body, a lid, or a packaging bag of a packaging container to which the valve device according to claim 1 is attached. A step of adhering an auxiliary film raw material having self-adhesive properties such as a wrap film to the release paper raw material,
A step of cutting and forming a pattern of the shape of the air passage in the auxiliary film raw material adhered to the release paper raw material,
A step of peeling off the margins of the auxiliary film raw material so that only the ventilation path pattern remains on the release paper raw material,
A step of laminating the substrate film raw material with an adhesive on the pattern of the air passage and the exposed portion of the release paper raw material,
Forming a cut in the shape of the valve body in the base film raw material,
4. The method for manufacturing a valve device according to claim 3, further comprising a step of removing a blank portion of the base film material. A valve device attached to a package such as a main body or a lid or a packaging bag of a packaging container,
While the packaging body has ventilation holes penetrating on the front and back,
The valve device includes an auxiliary film that overlaps the surface of the package in a state where the ventilation hole is closed, and a valve body made of a synthetic resin film that is covered with the auxiliary film and bonded to the package with an adhesive layer interposed therebetween. In this valve device, a ventilation means for communicating the ventilation hole with the atmosphere is provided,
Furthermore, a package with a valve device, wherein at least one of the auxiliary film of the valve device and at least the surface layer of the package is made of a self-adhesive film such as a wrap film.

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