JPWO2011052246A1 - Check valve, sealing bag, and manufacturing method thereof - Google Patents

Abstract

The present invention provides a check valve and a sealing bag that have a high degree of certainty in a check effect and that do not increase the manufacturing cost as much as possible. A check valve V includes flexible resin base sheets 31, 32 and a plurality of valve body sheets 4. The valve body sheet 4 includes an upstream valve body sheet 4a and a downstream valve. At least two of the body sheets 4b are made into one set, and both are bonded to the one-side base sheet 31, and the upstream valve body sheet 4a is bonded to the one-side base sheet 31 on the upstream end 4a1 side. The downstream end 4a2 side is movable with respect to the base sheets 31, 32, and the downstream valve body sheet 4b is bonded on the downstream end 4b2 side, and the upstream end 4b1 The side is movable with respect to the base sheets 31, 32, and the end portions 4a2, 4a2, 4b on the side of the valve body sheets 4a, 4b that are movable with respect to the base sheets 31, 32. 4b1 on the other side base sheet 32 And it is capable of close contact with. [Selection] Figure 1

Description

  The present invention relates to a check valve, a sealing bag provided with the check valve, a method for manufacturing the check valve, and a method for manufacturing the sealing bag.

  2. Description of the Related Art Conventionally, there is a sealing bag that can seal an article storage unit having a space for storing articles such as clothes and foods in an airtight state. This sealed bag has a check valve that allows various gases such as air existing in the article storage unit to be discharged to the outside of the bag and to keep the state of the bag so that the article storage unit and the bag exterior can be vented. Used.

  When the gas is discharged, the check valve allows passage of airflow in one direction and blocks airflow in the other direction by opening and closing an airflow passage space that is a space through which the gas passes. It can be done.

  As a conventional example of this check valve, there is a check valve described in Patent Document 1. As shown in FIG. 10, the check valve 100 has a rectangular plastic film 101 and a filter film 102 having the same width that is shorter than that of the rectangular plastic film 101. The edge is overlapped with the upper edge of the filtration film 102 and further laminated on one side of the plastic film 101 to form a flat laminate, and the both edges and the lower edge are heat bonded. And the upper side edge of the film 102 for filtration and the lower side edge overlap part 100a of the plastic films 103 and 104 are heat-bonded, the upper end is provided with an opening 106, and the lower surface has a filtration surface made of the film 102 for filtration. 107, and a gas discharge flow path 108 is formed between the plastic film 103. Then, the check piece 103a is formed of the plastic film 103, the operation pocket portion 109 is provided, and a low-viscosity inert liquid is applied to the upper inner surface of the plastic film 101 or the inner surface of the check valve 103, It is supposed to maintain closeness.

JP-A-9-112721

However, in the check valve 100 of the conventional example, only one check piece 103a is provided, and the airflow in the reverse direction is blocked by the close contact between the plastic film 101 and the check piece 103a. . That is, the above-mentioned close contact is made only at one place, and the certainty of the check effect is lacking. For this reason, in the invention according to Patent Document 1, it is essential to apply a low-viscosity inert liquid in order to enhance the check effect.
In order to improve the above, it is a matter of course that the structure must be such that the manufacturing cost of the check valve does not increase as much as possible.

  A desirable function of the check valve is to make the “initial pressure”, which is the atmospheric pressure in the sealed bag at the moment when exhaust starts, as small as possible. If the "initial pressure" is high, exhausting will not start easily, and it will be necessary to apply a large external force to the sealed bag, or the gas will not readily be exhausted and will remain in the bag, causing the sealed bag to swell up. Because there are things like this.

  In view of the above, the invention of the present application has improved the certainty of the check effect, the manufacturing cost is not increased as much as possible, and the check valve has a small “initial pressure” and vice versa. It is an object of the present invention to provide a sealing bag provided with a stop valve, and a check valve and a manufacturing method of the sealing bag.

In order to solve the above problems, the invention according to claim 1 of the present application is
A plurality of sheets are stacked to form an airflow passage space 3a that is a space through which gas passes between the sheets, and the airflow passage space 3a is opened and closed, so that the inlet to the outlet are formed. In the check valve that allows the airflow in the forward direction of the airflow to pass and blocks the airflow in the reverse direction from the outlet to the inlet,
A plurality of resin base sheets 31, 32 and a plurality of resin flexible valve body sheets 4,
The plurality of basic sheets 31 and 32 are provided facing the front and back directions,
Among the plurality of valve body sheets 4, at least two of the upstream valve body sheet 4 a disposed on the upstream side with respect to the positive airflow direction and the downstream valve body sheet 4 b disposed on the downstream side are provided. One set,
Each of the valve body sheets 4a, 4b constituting the one set is bonded to at least the one-side base sheet 31,
The adhesion is such that each valve body sheet 4a, 4b is in series with the airflow direction at the time of discharge, and both do not overlap in the front and back direction,
The upstream valve body sheet 4a is bonded to the one-side base sheet 31 on the upstream end 4a1 side, and the downstream end 4a2 side is movable with respect to the base sheets 31, 32,
The downstream valve body sheet 4b is bonded on the downstream end 4b2 side, and the upstream end 4b1 side is movable with respect to the one-side base sheet 31.
At least a part of the set of valve body sheets 4a and 4b is a valve body sheet 91 that is different from the other side base sheet 32 or the set of valve body sheets 4a and 4b. With respect to what is arranged on the opposite side of the one side base sheet 31 across the pair of valve body sheets 4a and 4b, it is possible to adhere and separate, thereby allowing the air flow in the forward direction, Provided is a check valve characterized by blocking air flow in the reverse direction.

The invention according to claim 2 of the present application is
A part of the one-side base sheet 31 is an airflow passage 31a having air permeability through which the airflow in the positive direction passes in the front and back directions,
The air flow passage portion 31a is the inflow port where the air flow in the positive direction flows into the check valve,
The said air flow passage part 31a is arrange | positioned among the said one side basic | foundation sheet | seats 31 upstream from the position which corresponds in the upstream end 4a1 of the said upstream valve body sheet | seat 4a in a front and back direction. The check valve described in 1. is provided.

The invention according to claim 3 of the present application is
The said one side base sheet 31 is comprised from the said airflow passage part 31a and another part, and this other part is provided with airtightness, The check valve of Claim 2 characterized by the above-mentioned is provided. .

The invention according to claim 4 of the present application is
On the side of the other side exterior sheet 32, the outlet 32b from which a forward airflow flows out from the check valve is provided,
The outlet 32b is formed by making the other-side exterior sheet 32 smaller than the one-side exterior sheet 31, or is formed by providing an opening in the other-side exterior sheet 32.
The outlet port 32b is disposed on the downstream side of the one-side basic sheet 31 with respect to the downstream end 4a2 of the upstream valve body seat 4a in the front-back direction. The described check valve is provided.

The invention according to claim 5 of the present application is
Bending seals s4 and s5 are formed between the inlet 31a and the inlet 31a,
The bending seals s4 and s5 are obtained by bonding the one side base sheet 31, the valve body sheet 4 and the other side base sheet 32 in the front and back direction,
The bent seals s4 and s5 are bent so that the flow path in the check valve V from the inflow port 31a to the inflow port 31a becomes a zigzag flow path in a plan view of the sheet. A check valve according to claim 4 is provided.

The invention according to claim 6 of the present application is
An inert substance 8 such as a silicon liquid is disposed in the flow path defined by the bent seals s4 and s5 and between the valve body sheet 4 and the other side basic sheet 32. A check valve according to claim 5 is provided.

The invention according to claim 7 of the present application is
The one side base sheet 31 has air permeability on the entire surface,
A part of the one-side base sheet 31 having air permeability is an airflow passage portion 31a through which the airflow in the positive direction passes in the front and back direction,
The air flow passage portion 31a is a portion of the one-side basic sheet 31 that is upstream of a position that coincides with the upstream end 4a1 of the upstream valve body seat 4a in the front and back direction. The check valve described in 1. is provided.
The invention according to claim 8 of the present application is
The check valve according to claim 2, wherein the air flow passage portion 31 a of the one-side base sheet 31 is a nonwoven fabric.
The invention according to claim 9 of the present application is
The one side base sheet 31 is composed of a non-woven fabric having air permeability on the entire surface,
A part of the one-side base sheet 31 having air permeability is an airflow passage portion 31a through which the airflow in the positive direction passes in the front and back direction,
2. The check valve according to claim 1, wherein a portion other than the airflow passage portion 31 a of the one-side basic sheet 31 is covered with an airtight covering sheet 92.

The invention according to claim 10 of the present application is
It is used by being attached to a sealed bag 1 provided with an article storage unit 2, and allows the article storage unit 2 and the outside of the bag to be vented in order to discharge the gas present in the article storage unit 2 to the outside of the bag. A check valve according to claim 1 is provided.

The invention according to claim 11 of the present application is
A sealed bag 1 to which the check valve V according to claim 4 is attached,
The sealed bag 1 includes flexible resin bag sheets 11 and 12,
By adhering the bag sheets 11 and 12, except for the part where the article storage port 1 a and the check valve V are attached, the bag sheet 11 and 12 are separated from the outside of the bag in an airtight manner.
Provided is a close bag characterized in that the entire periphery of the check valve V is bonded to the inside or outside of the bag sheets 11 and 12.

The invention according to claim 12 of the present application is
A sealed bag 1 to which the check valve V according to claim 7 is attached.
The sealed bag 1 includes flexible resin bag sheets 11 and 12,
By adhering the bag sheets 11 and 12, except for the part where the article storage port 1 a and the check valve V are attached, the bag sheet 11 and 12 are separated from the outside of the bag in an airtight manner.
The check valve V is sandwiched between the bag sheets 11 and 12, the upstream end based on the airflow direction at the time of discharge is located in the article storage unit 2, and the downstream end is outside the article storage unit 2. Located
A part of the upstream end side of the other side basic sheet 32 of the check valve V is bonded to the inner surface of the bag sheet 11, 12 facing the other side basic sheet 32,
The air flow passage part 31a in the one-side basic sheet 31 of the check valve V is exposed to a space in the article storage unit 2 in which articles can be stored,
A lateral seal 13 is formed by bonding the bag sheets 11 and 12,
The lateral seal 13 is formed so as to cross the check valve V in the width direction,
In addition to the above, a longitudinal seal 14 is formed by adhesion of the bag sheets 11 and 12,
The longitudinal seal 14 is a direction intersecting with the lateral seal 13 and is extended upstream from the lateral seal 14 on the basis of the airflow direction during discharge in the check valve V. And
The vertical seal 14 is formed so that the check valve V is sandwiched between the two in a set with two gaps wider than the width dimension of the check valve V.
The upstream end 141 of the vertical seal 14 has the above-mentioned check more than the lower end 31a1 of the portion through which air substantially passes, which is defined by the horizontal seal 13 in the airflow passage 31a of the one-side base sheet 31. Provided is a sealing bag characterized in that it is located on the upstream side with respect to the airflow direction during discharge in the valve V.

The invention according to claim 13 of the present application is
A check valve manufacturing method according to claim 1,
As the above-described basic sheets 31 and 32 and the valve body sheet 4, a long sheet continuously supplied in the longitudinal direction is used.
Each valve body sheet 4a, 4b constituting the one set is supplied as a single long sheet, and then cut into two sheets in the width direction, and then superimposed on the one-side base sheet 31. A check valve manufacturing method is provided.
The invention according to claim 12 of the present application is
In the manufacturing method of the sealed bag 1 to which the check valve V is attached,
The check valve V includes flexible resin base sheets 31 and 32 and a plurality of valve body sheets 4, and one side base sheet 31 of the base sheets 31 and 32 is air permeable over the entire surface. The base sheets 31 and 32 are provided opposite to each other in the front and back direction, and the upstream side of the plurality of valve body sheets 4 disposed on the upstream side with respect to the airflow direction at the time of discharge. At least two of the valve body sheet 4a and the downstream valve body sheet 4b arranged on the downstream side are made into one set, and each of the valve body sheets 4a, 4b constituting the one set is at least the above The valve body sheets 4a and 4b are connected in series to the air flow direction at the time of discharge, and the two do not overlap in the front and back directions. And above The side valve body sheet 4a is bonded to the one-side base sheet 31 on the upstream end 4a1 side, and the downstream end 4a2 side is movable with respect to the base sheets 31, 32. The body sheet 4b is bonded on the downstream end 4b2 side, and the upstream end 4b1 side is movable with respect to the base sheets 31 and 32. Of the valve body sheets 4a and 4b, The end portions 4a2 and 4b1 on the side that can be moved with respect to the base sheet 31, 32 can be brought into close contact with the other side base sheet 32, or are bonded to the other side base sheet 32. , A check valve that can be brought into close contact with a valve body sheet 4 different from that constituting the one set,
The bag sheets 11 and 12 are made of a flexible resin, and long sheets that are continuously supplied in the longitudinal direction are used.
Sandwiching the check valve V between the bag sheets 11, 12,
Forming a lateral seal 13 by crossing the check valve V in the width direction by bonding the bag sheets 11 and 12;
Forming a longitudinal seal 14 by bonding the bag sheets 11 and 12;
The longitudinal seal 14 formed in the above process is a direction intersecting with the lateral seal 13 and is upstream of the lateral seal 14 with reference to the airflow direction at the time of discharge in the check valve V. Is extended to
The vertical seal 14 is formed so as to sandwich the check valve V so as to form a pair of two with an interval wider than the width dimension of the check valve V.
The upstream end 141 of the vertical seal 14 has the above-mentioned check more than the lower end 31a1 of the portion through which air substantially passes, which is defined by the horizontal seal 13 in the airflow passage 31a of the one-side base sheet 31. Provided is a method for manufacturing a sealed bag, characterized in that it is located on the upstream side with respect to the direction of airflow during discharge in the valve V.

  The present invention includes a check valve that increases the certainty of the check effect and that does not increase the manufacturing cost as much as possible, and has a small “initial pressure”, and the check valve. It was possible to provide a sealed bag and a check valve and a method for manufacturing the sealed bag.

The check valve which concerns on an example of embodiment of this invention is shown, (A) is a top view, (B) is an end elevation of XX in (A), (C) is a bottom view It is. It is the schematic which exaggerated and showed the principal part which shows the relationship between the other side base sheet | seat and each valve body sheet | seat in the check valve of the example, and shows the time of airflow passage space closing. (A) is a top view of the sealing bag of the example, (B) is a top view of the principal part which shows the example which changed the shape of the vertical direction seal in the sealing bag of the example. It is the sealed bag of the same example, and is the schematic of the cross section of the bag alley-like part at the time of exhaust_gas | exhaustion. It is the schematic of the state which attached the non-return valve of the said example to the sealing bag which concerns on other embodiment of this invention, (A) is the perspective view in the back side of a bag, (B) is reverse on the back side of a bag. The longitudinal cross-sectional view in the position of a stop valve, (C) shows the cross-sectional view in the position of the YY arrow of (B) on the back side of a bag. (A) is a front view of the sealing bag which concerns on other embodiment of this invention, (B) is a front view of the sealing bag which concerns on further another embodiment of this invention, (C) is ( It is a center longitudinal cross-sectional view of the sealing bag of B). (A) is sectional drawing of the check valve which concerns on other embodiment of this invention, (B) is a top view of the check valve, (C) is a bottom view of the check valve. (D) is structure explanatory drawing which shows the state which attached the check valve to the inside of a sealing bag, (E) is structure explanatory drawing which shows the state which attached the check valve to the exterior of a sealing bag. . (A) is a top view of a check valve according to still another embodiment of the present invention, (B) is a bottom view of the check valve, and (C) is a sectional view of the check valve. And (D) is a structural explanatory view showing a state in which the check valve is attached to the inside of the sealing bag, and (E) is a cross-sectional view of the check valve according to still another embodiment. (A) It is sectional drawing of the check valve which concerns on other embodiment, (B) It is sectional drawing of the check valve which concerns on another embodiment. It is a longitudinal cross-sectional view in alignment with the longitudinal direction of the non-return valve which concerns on a prior art example.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

In addition, the expression indicating the position and direction such as “front, back,” “up, down, left, right”, “vertical, horizontal”, “one, the other” described in the claims and specifications according to the present invention, It is used for explanation and for specific reasons, and the applicant does not intend to limit the present invention to a positional relationship as described.
The expression “upstream, downstream” is based on the forward direction (the airflow direction during discharge along the longitudinal direction of the check valve V).

  The sealed bag 1 according to this embodiment can be used as a deaeration bag capable of discharging the gas present in the article storage unit 2 to reduce the volume. As a specific use of the deaeration bag, a food pack for storing food used for discharging air present in the article storage unit 2 (the effect of maintaining freshness by storing with less air in the bag) And a compression bag for clothing (which can be reduced by reducing the air in the bag). In addition, a bag in which an article such as coffee beans or powder detergent is stored in the article storage unit 2 and the gas generated from the article is discharged to the outside of the bag to suppress the expansion of the bag. Can also be implemented.

  As described above, the check valve V is attached to the sealing bag 1 so as to allow ventilation between the article storage section 2 and the outside of the bag in order to discharge the gas present in the article storage section 2 to the outside of the bag. In this example, one check valve V is provided for each sealing bag 1, but the present invention is not limited to this, and a plurality of check valves V may be provided for each sealing bag 1. .

  As shown in FIG. 3 (A), the sealed bag 1 of this example is made of a flexible resin, and includes a front bag sheet 11 and a back bag sheet 12 arranged in a superposed manner in the front and back directions. By bonding (heat-sealing) the bag sheets 11 and 12 to each other, the portion other than the portion where the article storage port 1a and the check valve V are attached is airtightly separated from the outside of the bag. The check valve V is attached by being sandwiched between the bag sheets 11 and 12 in the front and back direction. Note that the check valve V may be sandwiched only by one of the bag sheets 11 and 12 by folding one of the bag sheets 11 and 12 or the like. Moreover, in this example, as the bag sheets 11 and 12, two identical resin sheets that are rectangular in plan view are superimposed in the front and back direction, but it may be a bag provided with ridges on the side surfaces, Other shapes other than a rectangle may be used. Further, the article storage port 1a is provided with a chuck having a well-known configuration so that it can be opened and closed in an airtight manner. However, such an openable / closable chuck is not necessary for a bag for storing coffee beans or a sealed bag of the type in which the article storage port 1a is finally bonded and closed by a heat sealer.

  When the gas is discharged from the article storage portion 2 of the sealed bag 1, the check valve V allows the airflow to pass in the forward direction by opening and closing the airflow passage space 3 a that is a space through which the gas passes. The airflow in the suction direction can be blocked.

As shown in FIGS. 1A and 1C, the check valve V of this example is a rectangle whose plan view (bottom view) has a longer longitudinal dimension than a width dimension. The above airflow passes through.
The check valve V includes a flexible resin-made one-side basic sheet 31 and the other-side basic sheet 32, and a plurality of valve body sheets 4.

  As the base sheets 31 and 32, resin sheets having the same width are used, and are provided facing the front and back directions. Regarding the longitudinal dimension, the one-side base sheet 31 is longer than the other-side base sheet 32 (its operation and effect will be described later). And each of these foundation sheets 31, 32 is aligned on the upstream side (the left end side in FIG. 1) and overlapped in the front and back direction.

  The valve body sheet 4 is sandwiched and overlapped between these basic sheets 31 and 32. And the both ends in the width direction of each foundation sheet 31 and 32 and the upstream edge in a longitudinal direction are adhere | attached (heat-sealed), and it airtightly closes. Bonding at both ends in the width direction is performed on both the base sheets 31 and 32 and the valve body sheet 4. As will be described later, in this example, a non-woven fabric is used as the one-side base sheet 31, so the airflow inlet in the check valve V becomes an airflow passage portion 31 a (described later) in the one-side basic sheet 31. As this nonwoven fabric, a spunbond nonwoven fabric formed by melting a thermoplastic polymer and discharging it into a continuous long fiber shape, which has no fuzz and is excellent in water resistance and durability, is preferable. In addition, to achieve both strength and workability by using a core-sheath filament made of polyethylene that has a strong fiber, such as polyester inside, and a polyethylene that can be processed relatively softly and heat-sealed. You can also. The air flow passage 31a is an inflow port 31a through which a positive air flow flows into the check valve V. On the other hand, the outlet 32b from which the airflow in the forward direction flows out from the check valve V is the downstream end in the longitudinal direction of the check valve V (strictly speaking, the end side of the other side base sheet 32 and the one side base sheet). 31).

  In this example, as shown in FIG. 1C, a point seal 5 is formed at the center in the width direction of the check valve V, and the base sheets 31 and 32 and the valve body sheet 4 are bonded. In this example, the point seal 5 is formed as a short heat seal extending in the longitudinal direction of the check valve V. This point seal 5 is provided to rectify the airflow during discharge, but is not essential in the present invention and may not be formed.

  Among the plurality of valve body sheets 4, at least two of the upstream valve body sheet 4 a disposed on the upstream side and the downstream valve body sheet 4 b disposed on the downstream side form one set.

  In this example, a sheet (plastic film) having the same material and thickness is used as the other-side basic sheet 32 and the valve body sheet 4. As these sheets 32 and 4, “self-adhesive type” sheets (films) are used, which are easy to be in close contact with the opposing sheet disposed oppositely. In addition, as the one-side base sheet 31, a non-woven fabric is used as described later. However, the structure of each sheet | seat is not limited to the thing of this example, For example, when the base sheets 31 and 32 are exposed to the exterior of the sealing bag 1, the direction of the base sheet 32 is more than the valve body sheet | seat 4. A thick sheet is also acceptable.

  Each of the valve body sheets 4 a and 4 b constituting the one set is bonded only to the one-side base sheet 31. When three or more valve body sheets 4 are provided, the valve body sheet 4 may be bonded to the other side basic sheet 32. However, even in this case, it is an essential condition of the present invention that each of the valve body sheets 4a and 4b constituting one set is bonded to at least the one-side base sheet 31.

  The adhesion of the valve body sheets 4a and 4b constituting the one set to the one-side base sheet 31 is in series with the air flow direction in the valve when the valve body sheets 4a and 4b are discharged, and both are front and back. It does not overlap in the direction.

  The upstream valve body sheet 4a is bonded to the one-side basic sheet 31 on the upstream end 4a1 side. This bonded portion is indicated by s1 in FIG. The downstream end 4a2 side of the upstream valve body seat 4a is movable with respect to the basic seats 31 and 32.

The downstream valve body sheet 4b is bonded on the downstream end 4b2 side. This bonded portion is indicated by s2 in FIG. The upstream end 4 b 1 side of the downstream valve body seat 4 b is movable with respect to the base seats 31 and 32. In this example, the downstream end 4 b 2 of the downstream valve body seat 4 b coincides with the downstream end 31 b of the one-side base seat 31.

  That is, as the valve body sheets 4a and 4b are bonded as described above, the valve body sheets 4a and 4b are arranged on the one-side base sheet 31 with their free ends facing each other.

  In addition, as for the space | interval of each said valve body sheet | seat 4a, 4b, it is desirable to set it as the very small space | interval by the sheet | seat being cut | disconnected with the cutting blade as mentioned later, and the slit was formed. With such an extremely small interval, even when a nozzle or the like is inserted into the deaeration valve V during exhaust, there is no step between the valve body sheets 4a and 4b, so that the nozzle or the like is caught. There is nothing.

  And among the above-mentioned free ends, that is, the respective end portions 4a2 and 4b1 on the side made movable with respect to the base sheets 31 and 32 among the respective valve body sheets 4a and 4b, with respect to the other side base sheet 32 It is possible to adhere. When this contact is not made, as shown in FIG. 1 (B), a gap is formed between each valve body sheet 4a, 4b and the other-side base sheet 32, and the airflow passage space 3a is opened.

  Since the other side base sheet 32 is flexible, when the air flow passage space 3a is opened as described above, the other side base sheet 32 is lowered on the lower side in FIG. Move to. Therefore, the airflow passage space 3a is not clogged in the middle, and smooth exhaust is performed.

  At this time, even if the downstream valve body sheet 4b and the other side basic sheet 32 are hardly separated from each other by any chance (for example, due to condensation or the like), the end portions 4a2 of the valve body sheets 4a and 4b can be separated. From between 4b1, the airflow at the time of discharge can pass through the exposed part 31c (part located outside the article storage part 2 when the check valve V is attached to the sealing bag 1) of the one-side basic sheet 31. Therefore, exhausting does not become difficult.

  On the other hand, as shown in FIG. 2, a negative pressure f is generated inside the check valve V when the article storage portion 2 has a lower pressure than the outside of the bag. Due to the negative pressure f, the valve body sheets 4 a and 4 b are lifted from the one-side base sheet 31. As described above, since the other-side basic sheet 32 and the respective valve body sheets 4a and 4b are “self-adhesive” sheets, the two facing each other are surely in close contact with each other due to the lifting. When the contact is made, there is no gap between each of the valve body sheets 4a and 4b and the other side base sheet 32, and the airflow passage space 3a is closed.

  At this time, there is a case where the airflow s that attempts to flow back through the check valve V flows from the exposed portion 31c of the one-side base sheet 31 as indicated by an arrow in FIG. Then, the valve body sheets 4a and 4b are pressed against the other-side base sheet 32 by the airflow s trying to reversely flow, and the two are more securely adhered to each other. For this reason, the airflow passage space 3a is more and more reliably closed.

  In this example, as shown in FIG. 2, the valve body sheets 4 a and 4 b are in close contact with the other side base sheet 32. That is, since contact is made at two locations, the certainty of the check effect is further enhanced as compared with the check valve configuration disclosed in Patent Document 1. Therefore, unlike the invention according to Patent Document 1, application of a low-viscosity inert liquid is not essential. Therefore, it is advantageous in terms of manufacturing cost of the check valve. However, a low-viscosity inert liquid (for example, silicone oil) may be applied for the purpose of further enhancing the certainty of the check effect.

  In addition, when the valve body sheet | seat 4 is adhere | attached also on the other side base sheet 32, with respect to the valve body sheet | seat 4 with which each valve body sheet | seat 4a, 4b was each adhere | attached on the other side base sheet | seat 32. And adhere closely.

  In this example, the one-side base sheet 31 to which the valve body sheets 4a and 4b constituting the one set are bonded has air permeability over the entire surface. More specifically, in this example, the air-permeable one side base sheet 31 is a non-woven fabric.

  A part of the one-side basic sheet 31 is an airflow passage portion 31a through which the airflow at the time of discharge passes in the front and back direction. The air flow passage portion 31a is a portion on the upstream side of the one-side base sheet 31 with respect to the upstream end 4a1 of the bonded upstream valve body sheet 4a in the front and back direction.

  And although it has air permeability in the one side basic sheet 31 whole surface, the check valve V is attached to the sealing bag 1 as for the valve support part 31b which is a part which overlaps with each valve body sheet | seat 4a, 4b. In such a state, the airflow passage 31a is not a portion through which the airflow passes (however, the airflow passing between the end portions 4a2 and 4b1 of the valve seats 4a and 4b can pass as described above). .

  In this example, since the one side base sheet 31 is a nonwoven fabric, also in the said valve support part 31b, the surface which faces each valve body sheet | seat 4a, 4b is a rough surface. Therefore, even if each valve body sheet | seat 4a, 4b is a "self-adhesion type" as mentioned above, it can make it easy to leave | separate from the one side base sheet | seat 31. FIG.

  Conventionally, in order to easily separate the valve body sheet in this way, paint is applied to the surface of the base sheet facing the valve body sheet. Need not be applied. This is also advantageous in terms of manufacturing cost of the check valve.

  However, it is not essential that the one-side base sheet 31 has air permeability over the entire surface as in this example. Only a part of the airflow passage 31a may be made to be able to be ventilated by using a sheet that is partially permeable or by bonding a sheet that has air permeability and a sheet that does not have air permeability. Even in such a case, a rough surface may be formed on the valve support portion 31b by corona discharge treatment or the like in order to easily separate the valve body sheets 4a and 4b from the one-side base sheet 31. Is desirable.

  As described above, the downstream end 4 b 2 of the downstream valve body seat 4 b in this example is coincident with the downstream end 31 b of the one-side base seat 31. In this example, the one-side base sheet 31 has a longer longitudinal dimension than the other-side base sheet 32, and the base sheets 31 and 32 are aligned on the upstream side. Therefore, the non-contact part 4b3 in which the downstream part rather than the position which corresponds in the downstream end 32a of the other side basic sheet 32 in the front and back direction among the downstream valve body sheets 4b does not overlap with the other side basic sheet 32 in the front and back direction. It is said that.

  If the downstream end of the check valve V is aligned in the front and back direction without providing the non-contact portion 4b3 as described above, it is easy to be affected by the distortion (waving) generated in the sheet, and backflow is caused by capillary action. It is easy to happen. Since the above-mentioned distortion tends to become more prominent as it approaches the end side, in this example, the position where the other side sheet is in close contact with the one side sheet is shifted away from the end side, as shown in FIG. Since the side base sheet 32 and the downstream valve body sheet 4b are in close contact with each other, the influence of the strain is reduced. Thus, backflow can be effectively prevented also by providing the non-contact part 4b3.

  The check valve V configured as described above has an upstream end located in the article storage portion 2 of the sealing bag 1 and a downstream end located outside the article storage portion 2. Although it is the positional relationship of the check valve V with respect to the sealing bag 1, although the downstream end of the check valve V may protrude from the edge of the sealing bag 1, in this example, it is shown to FIG. 3 (A) (B). As shown, the check valve V is attached so that the downstream end of the check valve V is located closer to the article storage portion 2 than the edge of the sealing bag 1. That is, the check valve V in this example is sandwiched between the bag sheets 11 and 12 as a whole. Thereby, since the check valve V is protected by the bag sheets 11 and 12, a relatively thin sheet (plastic film) can be used as the base sheets 31 and 32. Further, since the check valve V can be prevented from protruding from the end edge of the sealing bag 1, the sealing bag 1 looks good, and the check valve V popping out when the sealing bag 1 is stored does not get in the way. . The point seal 15 shown in FIGS. 3A and 3B is obtained by bonding the bag sheets 11 and 12 in order to gather the bag sheets 11 and 12 downstream of the check valve V. May be omitted.

  In this example, the shape of the heat seal for bonding the bag sheets 11 and 12 has a step as shown in FIGS. Thereby, the article storage part 2 is formed as if it was partially cut away. A check valve V is disposed in the cut-out portion. In this example, the “notch” is formed in the corner of the sealing bag 1 having a rectangular shape in plan view so that the article storage portion 2 can be used as widely as possible. However, the present invention is limited to this. Instead, for example, a “notch” may be formed in the center of the end of the sealing bag 1 according to a design requirement.

  A part of the upstream end side of the other side basic sheet 32 of the check valve V is adhered to the inner surface of any one of the bag sheets 11, 12 on the side facing the other side basic sheet 32. The In this example, the valve fixing seal 6 is formed so as to be adhered to the backside bag sheet 12 as shown in FIG. 4, whereby the airflow passage portion 31 a of the one-side base sheet 31 of the check valve V becomes the article storage portion. 2 is exposed to a space in which an article can be stored. In this example, as shown in FIG. 1C, the valve fixing seal 6 is provided linearly at both ends in the width direction of the check valve V. As shown in FIG. As long as the check valve V can follow the deformation of the seat 12, the positional relationship, shape, and quantity may be variously changed. However, in order to effectively place the check valve V along the inner surface of the arch-shaped bag path portion 21 which will be described later, the valve fixing seal 6 is located in the airflow direction more than the upstream end 141 of the longitudinal seal 14. It is desirable to provide it on the downstream side. Since the airflow passage portion 31a is exposed as described above, the air present in the article storage portion 2 can be easily guided to the check valve V, and the exhaust can be smoothly performed.

  Further, a lateral seal 13 is formed on the sealing bag 1 by bonding (heat sealing) between the bag sheets 11 and 12. The longitudinal seal 14 and the transverse seal 13 do not indicate the longitudinal and lateral positions of the sealing bag 1 and the bag sheets 11 and 12, but the longitudinal direction is the direction along the upstream and downstream of the check valve V. The intersecting direction is the horizontal direction (transverse).

  The lateral seal 13 is formed so as to cross the check valve V in the width direction, and more specifically, is formed on the downstream side of the upstream end 4a1 of the upstream valve body seat 4a. . In this example, the lateral seal 13 is formed in a straight line shape in a plan view as shown in FIGS. 3A and 3B, but may be formed in a wavy shape. Such a wavy shape is advantageous because the exhaust pressure is applied unevenly in the width direction with respect to the check valve V when the air is discharged, and the airflow passage space 3a is easily opened.

  Moreover, in this example, the coating material for peeling 7 is applied to the inner surface of the other side basic sheet 32 in the portion where the horizontal seal 13 is formed, and the other side is heated by the heat when forming the horizontal seal 13 as a heat seal. It can be avoided that the base sheet 32 and the upstream valve body sheet 4a are lightly bonded to each other and cannot be exhausted smoothly. As an alternative to the peeling paint 7, a non-woven fabric may be attached to the inner surface of the other side base sheet 32.

  In addition to the horizontal seal 13, a vertical seal 14 is formed on the sealing bag 1 by bonding (heat sealing) between the bag sheets 11 and 12. The longitudinal seal 14 is a direction intersecting with the lateral seal 13 (a direction orthogonal in the present example), and the air flow direction at the time of discharge in the check valve V is set as a reference with respect to the lateral seal 14. It is extended to the upstream side. The vertical seal 14 is sandwiched between the inner vertical seal 14a and the outer vertical seal 14b so as to sandwich the check valve V with a wider width than the check valve V. It forms so that it may become 1 set. In this example, the outer vertical seal 14b formed on the right side of the check valve V in FIGS. 3A and 3B also serves as a side seal formed on the end side of the sealing bag. In this example, the inner vertical seal 14a and the horizontal seal 13 are simultaneously formed by one seal bar (hot plate).

  The upstream end 141 of the vertical seal 14 is located in the check valve V more than the lower end 31a1 of the portion through which air substantially passes, which is defined by the horizontal seal 13 in the airflow passage 31a of the one-side base sheet 31. It is located on the upstream side with respect to the direction of airflow at the time of discharge. As for the positional relationship between the upstream end of the check valve V and the upstream end 141 of the longitudinal seal 14, the upstream end 141 may be provided at a position higher than the upstream end of the check valve V in the airflow direction. desirable. In this example, as shown in FIG. 3A, the upstream end 141 of the inner longitudinal seal 14a is substantially in the same position as the upstream end of the check valve V in the airflow direction. Even when the upstream end 141 is provided on the downstream side of the upstream end of the check valve V, a large portion of the airflow passage portion 31a is overlaid on the arch-shaped bag path portion 21 described later. In order to wrap, it is desirable that the distance in the airflow direction between the upstream end 141 and the upstream end of the check valve V be as small as possible.

  Further, in this example, the inner vertical seal 14a is formed continuously in the illustrated vertical direction. However, for example, a ventilation gap 14c indicated by a broken line in FIG. 3A may be provided, or FIG. ), The inner longitudinal seal 14a may be intermittent. In such a case, as will be described later, a bag path-like portion 21 that can be deformed into an arch shape is formed, and the air present in the left portion of the inner vertical seal 14a in the article storage portion 2 is vented to the ventilation gap 14c. It is also possible to guide to the check valve V through the exhaust, and the exhaust can be made smooth.

  The lateral seal 13 and the longitudinal seal 14 form a bag path portion 21. As shown in FIG. 4, the bag path portion 21 has an arched cross section as shown in FIG. 4 when the article storage portion 2 is pressed by hand or when the internal pressure increases due to the generation of gas from the stored article. Swell. Since the check valve V is bonded to the backside bag sheet 12 as described above, the check valve V is along the inner surface of the bag path portion 21 that is arched as described above.

  Upon exhaust, the air in the article storage unit 2 is first guided to the bag path 21 and then sequentially discharged out of the bag through the airflow passage 31a. On the other hand, when such a bag path portion 21 is not formed, there may be a case where exhaust between the bag sheets 11 and 12 does not sufficiently spread even during exhaustion, resulting in exhaust failure. The formation of the pouch-like path portion 21 eliminates such a situation and makes it possible to exhaust more smoothly, thereby reducing the “initial pressure”.

  Here, in the conventional sealed bag, the check valve is difficult to open, and in order to reduce the above-mentioned “initial pressure”, a check valve is provided at the end of the sealed bag, and the basic seat and valve of the check valve are intentionally provided. The body sheet may be distorted. Then, the “initial pressure” can be reduced, but on the other hand, there is a problem that backflow easily occurs. On the other hand, the check valve V of the present invention is capable of performing smooth exhaustion alone, and the mounting position on the sealing bag 1 is not limited, and the degree of freedom in designing the sealing bag 1 is increased. Can do.

  Next, a method for manufacturing the check valve V will be described. As the basic sheets 31 and 32 and the valve body sheet 4, long sheets that are continuously supplied in the longitudinal direction are used. And after each valve body sheet | seat 4a, 4b which comprises the said 1 set is supplied with one elongate sheet | seat, and a cutting blade is applied after that and cut | disconnected by the width direction, it is one side The side base sheet 31 is overlaid and bonded. By this cutting, a slit is formed in one long sheet that is a material of the valve body sheet 4. Since the above-described superposition is performed immediately after the slit is formed, the distance between the valve body sheets 4a and 4b is kept very small and bonded. Therefore, the check valve V can be manufactured easily and with higher accuracy than supplying separate sheets as the material of the valve body sheets 4a and 4b, and the manufacturing cost does not increase.

  Note that, for the convenience of designing the manufacturing apparatus, the valve body sheet 4 supplied as a single long sheet is first overlapped with the one-side base sheet 31 and then overlapped. A cutting blade may be applied to the valve body sheet 4 and cut into two in the width direction to form the valve body sheets 4a and 4b.

  The check valve V is manufactured continuously in the width direction, and is individually cut when attached to the sealing bag 1. However, you may attach to the sealing bag 1 as a continuous valve with several continuous in the width direction.

  Next, a method for manufacturing the sealed bag 1 to which the check valve V is attached will be briefly described. As the bag sheets 11 and 12, a long sheet made of a flexible resin and continuously supplied in the longitudinal direction is used. And the manufacturing method of this sealing bag 1 includes the step of sandwiching the check valve V between the bag sheets 11 and 12, the step of forming the lateral seal 13 by bonding the bag sheets 11 and 12, Similarly, it has a step of forming the longitudinal seal 14 by bonding the bag sheets 11 and 12. With this manufacturing method, a sealed bag with a check valve can be manufactured continuously.

  Another embodiment is not limited to the bag as shown in FIG. 3A, but is a so-called “vertical pillow” type often used for packaging coffee beans as shown in FIG. 5A. The check valve V can be attached to the sealing bag 201. In addition, each figure of FIG. 5 has shown the state at the time of article storage. In FIG. 5C, the upper side of the figure is the inside of the bag, and the lower side of the figure is drawn as the outside of the bag.

  When manufacturing such a “vertical pillow” type sealing bag 201, one bag sheet 211 is folded at the crease lines 212, 212 on the left and right sides of the bag, and the edges of the bag sheet 211 are aligned on the back side. In this case, the check valve V is sandwiched between the opposite ends, and the seal formed thereby is used as the lateral seal 13 described above. Then, as shown in FIGS. 5B and 5C, the bag sheets 211 are bonded together so as to enter the inside of the sealing bag 201 with respect to the lateral seal 13 to form a seal. This seal functions as the vertical seal 14 described above. In the example shown in FIG. 5B, an auxiliary seal 16 is provided at the upstream end of the vertical seal 14 in the direction opposite to the check valve V and extending in parallel with the horizontal seal 13. Thus, the gas in the bag can be effectively guided to the bag path 21.

  Even in the “longitudinal pillow” type sealing bag 201, as in the bag shown in FIG. 3 (A), a bag path portion 21 is formed by the horizontal seal 13 and the vertical seal 14, and the internal pressure of the bag is reduced. When it rises, it swells so that the cross section of this bag path portion 21 becomes an arch shape (see FIG. 4). Therefore, similarly to the above, even in the sealed bag 201, the exhaust can be performed more smoothly and the “initial pressure” can be reduced. Therefore, when the stored item is a thing such as coffee beans that always generates gas (such as carbon dioxide), the generated gas is not easily discharged out of the bag and remains in the bag, so that the sealed bag 201 is There is no such thing as swelling up.

  In the example shown in FIG. 3, the check valve V is provided at the bottom of the sealing bag 1. However, the position where the check valve V is provided can be changed as appropriate. The center part (front surface or back surface) of the bag 1 may be used.

  The example of FIG. 6 (A) is an example provided at a position near the article storage port 1a in the side portion of the sealing bag 1. In this example, both the bag sheets 11 and 12 are recessed in the lateral direction to form a recess 211 at a position close to the article storage port 1a provided with the chuck, and are mounted horizontally with the check valve V interposed therebetween. is there. In this recess 211, both bag sheets 11, 12 are sealed,

The seal at the back of the recess 211 is the aforementioned lateral seal 13. In this example, when the liquid material is stored or when the food from which the juice comes out is stored, the liquid material accumulates at the bottom of the bag. Therefore, by providing a check valve V near the article storage port 1a, The check valve V can be adversely affected by the liquid material. In this embodiment, it is also possible to provide the longitudinal seal 14 in each of the previous examples.

  The examples of FIGS. 6B and 6C are examples provided at the center (front and back) of the sealing bag 1. In this example, one bag sheet 11 is divided into a first sheet 11a and a second sheet b. The edges of the first sheet 11a and the second sheet b are sealed to form a single bag seal. A check valve V is sandwiched between the first sheet 11a and the second sheet 11b. Install. The seal between the first sheet 11a and the second sheet 11b is a lateral seal 13 that crosses the check valve V. In this example, the downstream side of the check valve V is located on the outer surface (outside of the bag) of one sheet (second sheet 11b), and the check is placed on the inner surface (inside of the bag) of the other sheet (second sheet 11b). The upstream side of the valve V is located. The check valve V can be attached regardless of the front and back sides, but in this example, the one-side basic sheet 31 made of a nonwoven fabric or the like is disposed on the inner surface side of the bag. In the case where the check valve V is attached so that the one-side basic sheet 31 is located on the side facing the first sheet 11a, when the food is stored in the sealing bag 1 and heated in the microwave, it expands by heating. The one side basic sheet 31 of the check valve V is pressed against the first sheet 11a by the air, and there is a possibility that the air cannot be discharged well, but by arranging the one side basic sheet 31 inside the bag, The expanded air in the bag can be discharged well. In particular, in this example, the heat seal portion of the lateral seal 13 which is necessary for adhering the check valve V to the sealing bag 1 and attaching it as in the previous example becomes unnecessary. As a result, it is possible to discharge at a lower pressure, for example, storing articles that generate gas, such as coffee beans and powder detergent, and discharging the gas generated from these articles to the outside of the bag to expand the bag When implemented as a bag that can suppress the pressure, the initial pressure of the gas to be discharged can be lowered and discharged.

The second sheet 11b is desirably a sheet that can be heat-sealed on both sides. Specifically, it is desirable to use a co-pressing film made of a double-sided polyethylene film. The second sheet 11b is heat-sealed with the first sheet 11a including the lateral seal 13 on one side (the outer side in the figure), and the other bag sheet 12 on the other side (the inner side in the figure). This is because it is sealed. In addition, when using the sheet | seat which can heat seal only one side, as shown in the example of FIG. 5, it can also heat-seal by folding up the edge to seal. Further, by using a double-sided heat seal made of a double-sided polyethylene film or the like, the folding in the example of FIG. 5 becomes unnecessary.
In this embodiment, it is also possible to provide the longitudinal seal 14 in each of the previous examples.

  Another embodiment is shown based on FIG. In this example, a part of the check valve V in FIG. 1 is changed. Hereinafter, the changed part will be mainly described, and portions not described are the same as those in the check valve V in FIG. To do.

  In this example, the one-side basic sheet 31 is composed of two types of sheets. Specifically, the sheet 31a located on the upstream side of the one-side base sheet 31 is an airflow passage portion 31a, as in the example of FIG. 1, and is configured by a sheet having air permeability such as a nonwoven fabric. Unlike the previous example, the downstream sheet 31d is composed of an airtight sheet 31d. The ends of the airflow passage portion 31a and the airtight sheet 31d are bonded to the upstream end 4a1 of the upstream valve body sheet 4a at the bonding portion s1.

  In the example of FIG. 1, the other side base sheet 32 is made shorter than the one side base sheet 31 to create an air passage. In this example, the other side base sheet 32 and the one side base sheet 31 have the same size, The entire periphery was bonded to form an all-around bonded portion s3.

  As in the example of FIG. 1, an airtight sheet is adopted as the other-side basic sheet 32, but an outlet having an appropriate shape such as a slit is formed as an outlet on the downstream end side. The outflow port 32b is disposed on the downstream side (right side in the drawing) with respect to the downstream end 4a2 of the upstream valve body seat 4a and the upstream end 4b1 of the downstream valve body seat 4b.

  The check valve V can be disposed inside the sealing bag 1 as shown in FIG. The check valve V is disposed so as to cover the bag vent 17 provided in the back bag sheet 12 of the sealed bag 1 from the inside, and the entire periphery thereof is bonded to the back bag sheet 12. This adhesion can be shared with the all-around adhesion part s3 described above, or may be sealed separately. In the figure, the outflow port 32b and the bag vent 17 are provided at the same position, but may be provided at different positions as long as they are within the above-mentioned all-around adhesive portion s3.

When the air in the sealed bag 1 is discharged, the air enters the check valve V from the airflow passage 31a, and flows out from the bag vent 17 through the outlet 32b. When air tries to flow in from the outside, the inside of the check valve becomes negative pressure, and the upstream side valve body sheet 4a and the downstream side valve body sheet 4b come into close contact with the other side base sheet 32 to close the flow path.

Moreover, this check valve V can also be arrange | positioned outside the sealing bag 1, as shown in FIG.7 (E). The check valve V is disposed so as to cover the bag vent 17 provided in the backside bag sheet 12 of the sealed bag 1 from the outside, and the entire periphery thereof is bonded to the backside bag sheet 12. This adhesion can be shared with the all-around adhesion part s3 described above, or may be sealed separately. In the figure, the airflow passage portion 31a and the bag vent 17 are provided at the same position, but may be provided at different positions as long as they are within the range of the all-around adhesive portion s3.

When the air in the sealed bag 1 is discharged, the air enters the check valve V from the bag vent 17 through the airflow passage 31a and flows out from the outlet 32b. When air tries to flow in from the outside, the inside of the check valve becomes negative pressure, and the upstream side valve body sheet 4a and the downstream side valve body sheet 4b come into close contact with the other side base sheet 32 to close the flow path.
Regardless of whether the check valve V is attached to the inside or outside of the sealing bag 1, the check valve V and the bag vent 17 can be disposed on the front bag sheet 11.

  In FIG. 7, the vertical length is exaggerated, but actually, each sheet is substantially in contact with each other, and a small interval is opened only when there is air circulation. It ’s not too much.

In any of the embodiments, the check valve V of the present application can be provided with bending seals s4 and s5 so as to form a zigzag flow path in plan view. One specific example is shown in FIG. This example is a partial modification of the example of FIG. 7, and only the changed part will be described, but the parts other than those described are the same as the example of FIG.

  As in the example of FIG. 1, the check valve V of this example makes the other side basic sheet 32 shorter than the one side basic sheet 31, and provides a space between the other side basic sheet 32 and the all-around adhesive portion s <b> 3. The outlet 32b. Of course, it is possible to employ the outlet 32b as in the example of FIG.

The bent seals s4 and s5 are formed over substantially the entire length from the upstream end to the downstream end of the check valve V, and in the front and back direction, the one side base sheet 31, the valve body sheet 4 and the other side base sheet 32 are formed. The three parties are bonded. The check valve V employs a breathable sheet such as a non-woven fabric as in the airflow passage portion 31a of FIG. 7B. However, in order to display the bent seals s4 and s5 in an easy-to-understand manner, In FIG. 8A which is the plan view, unlike FIG. 7B, the mesh is not drawn.

  In this example, two bent seals s4 and s5 are formed, and the gap between the bent seals s4 and s5 is spread in a funnel shape toward the upstream side (left side in the figure) of the airflow passage portion 31a. Gradually increases. As a result, air enters the check valve V well from the airflow passage portion 31a. In a certain part of the valve body sheet 4, both the bending seals s 4 and s 5 are bent or curved while maintaining a narrow interval, and are directed to the downstream side (right side in the drawing). Both bent seals s4 and s5 have different lengths, and one bent seal s4 disappears when it enters the downstream valve body sheet 4b beyond the upstream valve body sheet 4a. The other bent seal s5 extends to the downstream end of the other side base sheet 32 and disappears. Bending seals s4 and s5 are not formed at the outlet 32b between the downstream end of the other-side base sheet 32 and the all-around adhesive portion s3. This is to ensure that air is discharged from the outlet 32b. Of course, the above description is merely an example of the bent seals s4 and s5. In a certain part of the valve body seat 4, while the air straightness is weakened and the flow path is narrowed, the upstream side is closer to the upstream end. As long as the flow path is widened near the downstream end, the flow of air inside and outside the check valve V can be made smooth. Further, although two bending seals s4 and s5 are formed, only one may be formed. In this case, the flow path is between one bent seal and the all-around adhesive portion s3. Conversely, the number of bending seals can be three or more, and it can be used in combination with a point seal or the like. Further, the shapes of the one-side basic sheet 31 and the other-side basic sheet 32 may be cut along the shapes of the bent seals s4 and s5, and the bent seals s4 and s5 also serve as a part of the all-around adhesive portion s3. It may be a thing.

  Further, in this example, a small amount of an inert substance 8 such as a silicon liquid is disposed in the middle of the flow path between the bent seals s4 and s5 and between the valve body sheet 4 and the other side base sheet 32. doing. When the upstream side valve body sheet 4a is in close contact with the other side base sheet 32 and closes the flow path, the closeness between the two is enhanced to prevent air leakage. Therefore, in this example, the inert substance 8 such as a silicon liquid is disposed only between the upstream valve body sheet 4a and the other side base sheet 32, but the downstream side valve body sheet 4b and the other side base sheet 32 Can also be placed between.

This check valve V can be arranged inside or outside the sealing bag 1 as in the example of FIG. 7, and prevents the back flow of fluid by the same action as the check valve V of FIG. Only allow fluid flow in one direction (in this example from the inside to the outside of the bag). FIG. 8D shows an example in which the outer side of the bag sheet 12 of the sealed bag 1 is attached.
Since the check valve V is provided with the bent seals s4 and s5 as described above, the flow path of the air is a labyrinth, so even if air flows in the forward direction, a slight resistance is obtained. Occurs. The degree of resistance can be variously changed according to the shape, size, and length of the bent seals s4 and s5, and can be adjusted according to the application. For example, when this check valve V is used in a sealed bag for storing food, vapor generated from the food when the microwave oven is thawed or heated may be released to the outside of the sealed bag by this check valve V. However, the provision of the bent seals s4 and s5 provides resistance to air discharge, and the steam is gradually discharged out of the bag. As a result, the food can be steamed and a more delicious thawing cooking in a microwave oven becomes possible. As described above, the shape and size (length and width) of the bent seals s4 and s5 can be appropriately changed according to the required air discharge amount.

  FIG. 9A shows an example in which a valve body sheet 91 separate from the valve body sheets 4a and 4b is provided. The new valve body seat 91 is disposed between the valve body seats 4a and 4b and the other side basic seat 32 inside the check valve V, and at least one of the valve body seats 4a and 4b. The new valve body sheet 91 and the both valve body sheets 4a and 4b jointly perform fluid passage and backflow prevention. This new valve body seat 91 can also be employed in other embodiments of the present invention.

  In the example of FIG. 7 and FIG. 8 described above, the one-side basic sheet 31 is divided into an airflow passage 31a such as a nonwoven fabric and an airtight sheet 31d, but as shown in FIG. It is also possible to configure the entire one side base sheet 31 with a breathable material such as a non-woven fabric and cover only the downstream side portion with an airtight covering sheet 92. Occurrence of the situation that the valve body sheets 4a and 4b are unnecessarily closely attached to the one-side basic sheet 31 and do not serve as a check valve by configuring the entire one-side basic sheet 31 with a nonwoven fabric or the like. Can be prevented. The thickness of the covering sheet 92 can be set freely, but by using a relatively thick hard sheet, bending or twisting occurs when the check valve V is pushed by the contents of the sealing bag. Can be prevented, and the valve can be protected and its function can be reliably exerted.

By providing the check valve V as described above, the manufacturing cost of the check valve V is not increased as much as possible, but the certainty of the check effect can be improved, and various types of the check valve can be attached. The sealed bag 1 can be made superior to the conventional one.
In particular, when the items stored in the sealed bag 1 are prone to deterioration such as food, the exhaust of the article storage unit 2 can be smoothly performed, so that the stored item has an antioxidant effect and contributes to maintaining freshness. be able to.

DESCRIPTION OF SYMBOLS 1 Sealing bag 11 Front side bag sheet 12 Back side bag sheet 13 Lateral seal 14 Longitudinal seal 141 Upstream end of longitudinal seal 2 Article storage part 3a Airflow passage space 31 One side basic sheet 31a Airflow passage part 32 Other side basic sheet 4 Valve Body sheet 4a Upstream valve body sheet 4a1 Upstream end of upstream valve body sheet 4a2 Downstream end of upstream valve body sheet 4b Downstream valve body sheet 4b1 Upstream end of downstream valve body sheet 4b2 Downstream end of downstream valve body sheet 4b3 Non-contact part of downstream valve body seat V Check valve

Claims (14)

A plurality of sheets are stacked to form an airflow passage space, which is a space through which gas passes between the sheets, and the airflow passage space is opened and closed, so that the normal flow from the inlet to the outlet is established. In a check valve that allows airflow in the direction and blocks airflow in the reverse direction from the outlet to the inlet,
It is equipped with a plurality of resin-made basic sheets and a plurality of resin-made flexible valve body sheets,
The plurality of basic sheets are provided facing the front and back direction,
Among the plurality of valve body sheets, at least two of the upstream valve body sheet disposed on the upstream side with respect to the positive airflow direction and the downstream valve body sheet disposed on the downstream side are one set. Has been
Each valve body sheet constituting the one set is bonded to at least one side base sheet,
The bonding is such that each valve body sheet is in series with the airflow direction at the time of discharge, and both do not overlap in the front and back direction,
The upstream valve body sheet is bonded to the one-side base sheet on the upstream end 1 side, and the downstream end side is movable with respect to the base sheet,
The downstream valve body sheet is bonded on the downstream end side, and the upstream end 1 side is movable with respect to the one-side base sheet,
At least a part of the set of valve body sheets is a valve body sheet different from the one set of valve body sheets with respect to the other side basic sheet, and sandwiches the set of valve body sheets. With respect to the one arranged on the side opposite to the one-side base sheet, it is possible to closely contact and disengage, thereby allowing forward air flow and blocking reverse air flow. Check valve. A part of the one-side base sheet is an airflow passage portion having air permeability through which the airflow in the positive direction passes in the front and back direction,
The airflow passage part is an inlet through which a positive airflow flows into the check valve,
2. The reverse according to claim 1, wherein the air flow passage portion is disposed on the upstream side of the one-side basic sheet, with respect to the upstream end of the upstream valve body sheet in a front-back direction. Stop valve. The check valve according to claim 2, wherein the one-side basic sheet is composed of the airflow passage part and another part, and the other part has airtightness. On the side of the other exterior sheet, provided with the outlet from which the airflow in the forward direction flows out from the check valve,
The outlet is formed by making the other side exterior sheet smaller than the one side exterior sheet, or by forming an opening in the other side exterior sheet,
The non-return check according to claim 1, wherein the outlet is disposed on the downstream side of the one-side basic sheet, with respect to a position that coincides with the downstream end of the upstream valve body sheet in the front and back direction. valve. A bent seal is formed between the inlet and the inlet;
The bending seal is obtained by adhering the one side base sheet, the valve body sheet and the other side base sheet in the front and back direction,
5. The bent seal according to claim 4, wherein the bent seal is bent so that a flow path in the check valve from the inlet to the inlet becomes a zigzag flow path in a plan view of the seat. Check valve. 6. The flow path defined by the bent seal, wherein an inert substance such as a silicon liquid is disposed between the valve body sheet and the other side base sheet. The check valve described. The one-side base sheet has air permeability on the entire surface,
A part of the one-side base sheet having air permeability is an airflow passage portion through which the airflow in the positive direction passes in the front and back direction,
2. The reverse according to claim 1, wherein the air flow passage portion is a portion on the upstream side of a position of the one-side basic sheet that coincides with an upstream end of the upstream valve body seat in a front-back direction. Stop valve. The check valve according to claim 2, wherein the air flow passage portion of the one-side base sheet is a non-woven fabric. The one side base sheet is composed of a non-woven fabric having air permeability on the entire surface,
A part of the one-side base sheet having air permeability is an airflow passage portion through which the airflow in the positive direction passes in the front and back direction,
2. The check valve according to claim 1, wherein a portion other than the airflow passage portion of the one-side basic sheet is covered with an airtight covering sheet. It is used by being attached to a sealed bag provided with an article storage section, and allows the article storage section and the outside of the bag to be vented in order to discharge the gas present in the article storage section to the outside of the bag. The check valve according to claim 1. A sealed bag with a check valve according to claim 4,
This sealed bag has a flexible resin bag sheet,
By adhering the bag sheet, except for the part where the article storage port and the check valve are attached, the bag sheet is airtightly separated from the outside of the bag,
A close bag, wherein the entire periphery of the check valve is adhered to the inside or the outside of the bag sheet. A sealed bag to which the check valve according to claim 7 is attached,
This sealed bag has a flexible resin bag sheet,
By adhering the bag sheet, except for the part where the article storage port and the check valve are attached, the bag sheet is airtightly separated from the outside of the bag,
The check valve is sandwiched between the bag sheets, the upstream end based on the airflow direction at the time of discharge is located in the article storage unit, the downstream end is located outside the article storage unit,
A part of the upstream end side in the other side basic sheet of the check valve is bonded to the inner surface of the bag sheet facing the other side basic sheet,
The airflow passage part in the one-side base sheet of the check valve is exposed to a space in which the article can be stored in the article storage part,
A lateral seal is formed by the adhesion of the bag sheet,
The lateral seal is formed so as to cross the check valve in the width direction,
In addition to the above, a longitudinal seal is formed by adhesion of the bag sheet,
The longitudinal seal is a direction intersecting with the lateral seal, and is extended upstream from the lateral seal with reference to the airflow direction at the time of discharge in the check valve,
The vertical seal is formed so as to sandwich the check valve so as to form a set of two with a wider interval than the width of the check valve.
The upstream end of the longitudinal seal is defined by the lateral seal in the airflow passage portion of the one-side base sheet, and is substantially lower than the lower end of the portion through which air passes when discharging in the check valve. A sealed bag, which is located upstream with respect to the airflow direction. A check valve manufacturing method according to claim 1,
As the basic sheet and the valve body sheet, a long sheet continuously supplied in the longitudinal direction is used.
Each valve body sheet constituting the one set is supplied as a single long sheet, and then cut into two sheets in the width direction and then superimposed on the one side base sheet. And a check valve manufacturing method. In the manufacturing method of the sealed bag to which the check valve is attached,
The check valve includes a flexible resin base sheet and a plurality of valve body sheets,
Of the basic sheets, the one-side basic sheet has air permeability on the entire surface,
The basic sheet is provided facing the front and back direction,
Among the plurality of valve body sheets, at least two of the upstream valve body sheet disposed on the upstream side with respect to the airflow direction at the time of discharge and the downstream valve body sheet disposed on the downstream side are a set. Has been
Each of the valve body sheets constituting the one set is bonded to at least the one side base sheet,
The bonding is such that each valve body sheet is in series with the airflow direction at the time of discharge, and both do not overlap in the front and back direction,
The upstream valve body sheet is bonded to the one-side base sheet on the upstream end side, and the downstream end side is movable with respect to the base sheet,
In the downstream valve body sheet, the bonding is performed on the downstream end side, and the upstream end side is movable with respect to the base sheet,
Of each of the valve body sheets, each end on the side made movable with respect to the base sheet was made in close contact with the other side base sheet,
Alternatively, it is a check valve that is bonded to the other side base sheet, and that can be in close contact with another valve body sheet that constitutes the one set,
As a bag sheet, it is made of a flexible resin, and a long sheet that is continuously supplied in the longitudinal direction is used.
Sandwiching the check valve between the bag sheets,
Forming a lateral seal by crossing the check valve in the width direction by bonding the bag sheet;
Forming a longitudinal seal by bonding the bag sheet,
The longitudinal seal formed in the above process is a direction intersecting with the lateral seal, and is extended upstream from the lateral seal with reference to the air flow direction during discharge in the check valve. And
The vertical seal is formed so as to sandwich the check valve so as to form a pair of two with an interval wider than the width of the check valve.
The upstream end of the longitudinal seal is defined by the lateral seal in the airflow passage portion of the one-side base sheet, and is substantially lower than the lower end of the portion through which air passes when discharging in the check valve. A method for manufacturing a sealed bag, which is located upstream with respect to the airflow direction.

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