JP2007276863A - Packaging bag with check valve, and check valve for use in it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging bag with a check valve, which enables inside air to stably flow out. <P>SOLUTION: This packaging bag with the check valve inhibits the flow of air outside the bag into the bag by the force of adhesion between the films, and permits the outflow of the in-bag air to the outside of the bag through a ventilation passage by separating both the films from each other by the air pressure of the in-bag air. The check valve T is constituted by bonding the overlying outside and inside films 1 and 2 together with the ventilation passage 4 demarcated between opposed surfaces in a partitioned manner. An outward opening 4B, which communicates with the outside Vo of the bag, and an inward opening 4A, which communicates with the inside Vi of the bag, are formed in the ventilation passage 4. An inward opening-side end of the ventilation passage 4 is equipped with a separation inducing part 5 for alleviating the force of adhesion between the outside and inside films 1 and 2. The check valve T is bonded in an attitude along a storage space forming part b1 forming a storage space of the packaging bag B with the outward or inward opening 4B or 4A and a part b2 for establishing the communication of the inside and outside of the packaging bag B communicating with each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  In the present invention, a bag-inside / outside-communication portion capable of communicating inside and outside the bag is formed in an airtight packaging bag, and the inside and outside of this bag-inside / outside-communication portion is formed between the two films by the adhesion between the films. The air passage is kept closed to prevent the air outside the bag from flowing into the bag, and the air inside the bag is peeled off by the air pressure of the air inside the bag, so that the air inside the bag goes out of the bag through the air passage. The present invention relates to a check bag with a check valve provided with a check valve that permits the outflow of the check valve, and a check valve used therefor.

  In this type of packaging bag with check valve, as shown in FIGS. 33 to 35, the check valve 10 has a short filter film 12 having a fine hole in a long first film 11, By laminating the short-sized second film 13 in order and sealing an appropriate place, the inner opening 14A that leads to the inside of the bag through the filter film 12, the end of the second film 13, and the first film 11 An air passage 14 having an outer opening 14B formed between the first film 11 and the second film 13 is defined between the opposing surfaces of the first film 11 and the inner opening 14A. Is positioned inside the airtight packaging bag 17 and the check valve 10 is inserted into the packaging bag 17 so that the outer opening 14B is located outside the packaging bag 17, and the periphery is sealed in a sealed state. Wrapping the check valve 10 so that it protrudes outward from the packaging bag 17 It was attached to the bag 17. (For example, see Patent Document 1 below)

  Such a packaging bag with a check valve has a light weight and a simple structure by attaching to the packaging bag 17 a check valve 10 in which plastic films 11, 12, 13 are laminated and bonded in a sealed state. When the bag interior Vi is negative with respect to the bag exterior Vo, as shown in FIG. 34, both the plastic films 11 and 13 are attracted by the pressure difference between the inside and outside of the bag, and the outside due to the adhesion force between the both plastic films 11 and 13 When the second film 13 and the first film 11 in the side opening 14B are brought into close contact with each other, the air passage 14 is held in a closed state to prevent the outside air from flowing into the bag inside Vi, and the bag inside Vi When positive pressure is applied to the bag exterior Vo, as shown in FIG. 35, both the plastic films 11 and 13 are removed from the inner opening 14A by the air pressure of the bag air Ai. Since the air Ai in the bag can flow out to the outside of the bag Vo by reaching the outer opening 14B while pushing away and opening the air passage 14, the substance that generates gas (for example, powder soot) Has been widely used to construct products that store airtight.

JP-A-8-324584

  However, in the conventional packaging bag with a check valve as described above, since the check valve 10 is provided in the packaging bag 17 so as to protrude outward from the packaging bag 17, the packaging bag 17 is stored or transported. When the stacks are stacked, the protruding portion of the check valve 10 is bent and the air passage 14 of the check valve 10 is closed, which makes it impossible to allow the air Ai in the bag to flow out. It was.

  The present invention has been made in view of the above-described problems, and its main problem is a packaging bag with a check valve that can stably flow out air in the bag even when stacked during storage or transportation. Is to provide

A first characteristic configuration of the present invention relates to a packaging bag with a check valve,
A bag-inside / outside-communication part that allows the inside and outside of the bag to communicate with each other is formed in an airtight packaging bag, and the air passage between the two films is closed inside or outside of the inside-and-outside bag communication part. The air in the bag is prevented from flowing into the bag while being held in the state, and the air in the bag is allowed to flow out of the bag through the ventilation path by peeling off both films in the closed state by the air pressure of the bag air. It is a packaging bag with a check valve provided with a check valve,
The check valve is configured by adhering the laminated outer film and inner film in a state in which an air passage is defined between the opposing surfaces of the two films, and the air passage includes the outside of the bag or the bag. An outer opening that communicates with the inner and outer communication portions and an inner and outer communication portion that communicates with the bag or an inner opening that communicates with the bag are formed. While being provided with a peeling inducing part that induces peeling of both films in a close contact state by relaxing the adhesive force between the film and the inner film,
The check valve is in a state in which the outer opening or the inner opening communicates with the inner and outer communication portions of the packaging bag, and in a posture along the storage space forming portion that forms the storage space of the packaging bag. The point is that it is adhered to the storage space forming part.

  According to the above characteristic configuration, when the inside of the bag has a negative pressure with respect to the outside of the bag, the outer film and the inner film constituting the check valve are vented between the opposing surfaces of the two films due to the adhesion between the films. Holding the path closed, it suppresses the air outside the bag from flowing into the bag, and when the inside of the bag changes from a negative pressure to a positive pressure with respect to the outside of the bag, the air inside the bag goes outside the bag. By peeling both films from the peeling inducing portion of the inner opening by air pressure, the air passage can be closed and the air in the bag can be surely and smoothly flowed out through the air passage. Moreover, since the check valve for this purpose is adhered to the storage space forming portion in a posture along the storage space forming portion, the check valve does not protrude outward from the packaging bag, and is stacked during storage and unloading. Even when the check valve is bent, it is possible to prevent the air passage from being closed by bending the check valve, and the valve function of the check valve can always be exhibited reliably and satisfactorily.

The second feature configuration of the present invention specifies a preferred embodiment in the implementation of the first feature configuration.
The peeling inducing portion is provided with a convex portion that forms an air inflow space into which air from the inner opening can flow in at least one of the opposing surfaces of both films.

  According to the above characteristic configuration, when the inside of the bag changes from a negative pressure to a positive pressure with respect to the outside of the bag, the air in the bag can smoothly flow into the air inflow space of the separation inducing portion through the inner opening. The air pressure of the inflow air can further alleviate the adhesion between the films, whereby the air in the bag can be quickly discharged.

The third feature configuration of the present invention specifies a preferred embodiment in the implementation of either the first or second feature configuration.
The inner opening side end of the air passage in the inner film is configured to have higher hardness than the outer film.

  According to the above characteristic configuration, the inside of the bag changes from negative pressure to positive pressure with respect to the outside of the bag, and the inside surface of the inner film facing the inside of the bag and the inside of the outer film facing each other across the air passage When the outward pressure of the bag due to the air in the bag is generated against the side surface, the amount of deformation of the inner film outside the bag is less than that of the outer film, in other words, the bag of the outer film than the inner film. Since the amount of deformation to the outside can be increased, the outer film moves relative to the outer side relative to the inner film, so that the air passage entrance is widened by the difference in the movement, and the air is released to the separation inducing part. Can be made to flow, whereby the peeling of both films at the peeling inducing portion can be further promoted, and the air in the bag can be more quickly discharged.

The fourth characteristic configuration of the present invention specifies a preferred embodiment in the implementation of any of the first to third characteristic configurations,
The inner inner film is provided with a filtering means for preventing the stored items in the bag of the packaging bag from entering the air passage.

  According to the above characteristic configuration, even when the inside of the bag is at a positive pressure with respect to the outside of the bag, even if the inside of the bag and the outside of the bag are communicated with each other by the check valve vent, Can be prevented from leaking.

The fifth feature configuration of the present invention specifies a preferred embodiment in the implementation of the fourth feature configuration.
The filtering means is configured such that one side thereof is bonded to the inner film at the inner opening side end of the air passage to form the peeling inducing portion.

  According to the above characteristic configuration, since the separation inducing part can be formed using the filtering means, the number of process types and the number of processes in the production process are reduced as compared with the case where the filtering means and the separation inducing part are formed separately. This can be advantageous in terms of production efficiency.

The sixth characteristic configuration of the present invention specifies a preferred embodiment in the implementation of any one of the first to fifth characteristic configurations,
The inner opening is disposed at an intermediate position in the ventilation direction of the ventilation path, and the outer opening is formed at both sides in the ventilation direction of the ventilation path, respectively.
The peeling inducing portions are respectively provided at both end portions on the inner opening side of the air passage.

  According to the above characteristic configuration, when the inside of the bag is positive with respect to the outside of the bag, an inner opening disposed at an intermediate position of the air passage and a pair of outer openings formed at both sides of the air passage in the air passage direction The air in the bag can be discharged out of the bag through the two air passages formed by the part, for example, when one air passage is clogged or the separation inducing part of one air passage is the air in the bag Even if an unforeseen situation occurs, such as when the air does not peel off due to air pressure, the air in the bag can flow out of the bag through the other air passage, thereby stabilizing the outflow function of the air in the bag. be able to.

The seventh characteristic configuration of the present invention specifies a preferred embodiment in the implementation of any of the first to sixth characteristic configurations,
The check valve is adhered to the inner surface of the storage space forming portion so that the outer opening and the bag internal / external communication portion communicate with each other between the storage space forming portion and the outer film. Is the point that is formed.

  According to the above characteristic configuration, when the inside of the bag changes from a positive pressure to a negative pressure with respect to the outside of the bag, the outside air flows into the ventilation space from the inside / outside communication portion of the bag of the packaging bag forming portion, so that the inside of the bag enters the ventilation space. Since the air flow in the direction (that is, the direction perpendicular to the storage space forming part) can be generated, the outer film can be brought closer to the inner film by pressing the outer side of the outer film inward of the bag by this air flow. As a result, the air passage can be closed more quickly, and the amount of outside air flowing into the bag can be reduced.

The eighth characteristic configuration of the present invention specifies a preferred embodiment in the implementation of any of the first to seventh characteristic configurations.
The check valve is bonded to the inner surface of the storage space forming portion, and the inside / outside communication portion of the bag has an opening or a notch in the airflow passage facing portion of the storage space forming portion facing the airflow passage. It is in the point formed and constituted.

  According to the above characteristic configuration, it is possible to suppress the outward deformation of the bag in the ventilation path component of the outer film from being restrained by the storage space forming portion. Even in a state where the storage space forming part can hardly be deformed by storing, the outer film can be peeled from the state in close contact with the inner film, and the air in the bag can be stably supplied regardless of the storage amount of the stored items. Can be spilled.

The ninth characteristic configuration of the present invention specifies a preferred embodiment in the implementation of any one of the first to fourth or sixth to eighth characteristic configurations.
The check valve is bonded to the inner surface of the storage space forming portion, and the outer film and the outer film facing portion of the storage space forming portion facing the outer film are configured to be translucent, The peeling inducing part is composed of a printing ink layer applied to at least one of the inner film and the outer film.

  That is, for example, although it is possible to construct a peeling inducing part by sticking a nonwoven fabric having a smaller adhesion to the film than the films to at least one of the films, in that case, in the production process, a check valve configuration A plurality of processes are required, such as a disposing process for disposing a non-woven fabric at a predetermined position of a belt-shaped film for use, and a heat-sealing process for heat-sealing and laminating the disposed non-woven fabric to the belt-shaped film. In order to configure the inducing portion with high accuracy, each step must be performed while the strip film is stopped, and both the transport path and the transport time of the strip film become long.

  On the other hand, in the production process, in the production process, the belt-like film for the check valve structure is continuously conveyed while continuously transporting the strip-inducing part of the belt-like film while continuously feeding the belt-like film. Since it is possible to continuously form the peeling inducing section by the printing process alone without stopping the conveyance, the conveyance path and conveyance time of the belt-like film can be shortened, which is advantageous in terms of production efficiency. can do.

  Moreover, since the printing ink layer constituting the peeling inducing portion can be visually recognized from the outer surface of the packaging bag through the translucent packaging bag and the outer film, for example, depending on the type of stored item or by sales destination The distinguishability can be improved by changing the color type of the printing ink layer.

The tenth characteristic configuration of the present invention specifies a preferred embodiment in the implementation of any of the first to fourth or sixth characteristic configurations.
The check valve is bonded to the outer surface of the storage space forming part, the outer film is configured to be translucent, and the peeling inducing part is applied to at least one of the inner film or the outer film. It is in the point comprised from the printing ink layer.

  According to the above-mentioned characteristic configuration, in the production process, the strip-inducing part is independently formed in the printing process by sequentially printing the strip-like part of the strip-shaped film while continuously transporting the strip-shaped film for the check valve configuration. Since the film can be continuously formed, the transport route and transport time of the belt-like film can be shortened, which can be advantageous in terms of production efficiency. In addition, since the printing ink layer constituting the peeling inducing portion can be visually recognized from the outer surface of the packaging bag through the translucent outer film, for example, the printing ink layer according to the type of stored item or by sales destination. The discriminability can be improved by changing the color type.

The eleventh characteristic configuration of the present invention relates to a check valve,
By holding the air passage between the films in a closed state by the adhesion between the films to prevent the inflow of outside air into the inside, and by peeling both films in the closed state by the air pressure of the inside air A check valve that allows the outside air to flow outward through the air passage,
The laminated outer film and inner film are bonded to each other in a state in which an air passage is defined between the opposing surfaces of the two films, and an outer opening that opens outward is formed in the air passage. An inner opening that opens in the direction is formed, and the inner opening side end of the air passage is further peeled off by relaxing the adhesion between the outer film and the inner film. With a delamination-inducing part that induces
The outer film or the inner film is communicated with a bag inner / outer communication portion capable of communicating the inside and outside of the bag formed in an airtight packaging bag with the outer opening or the inner opening. In the state and the attitude | position along the storage space formation part which forms the storage space of a packaging bag, it exists in the point provided with the adhesion allowance which can be adhere | attached on a storage space formation part.

  According to the above characteristic configuration, when the inner side is negative with respect to the outer side, the outer film and the inner film hold the air passage between the opposing surfaces of the two films in a closed state due to the adhesion between the films. In addition, it is possible to prevent the outside air from flowing into the inside, and when the inside changes from negative pressure to positive pressure with respect to the outside, the inside opening is caused by the air pressure toward the outside of the inside air. Both films can be peeled off from the peeling inducing portion, thereby releasing the closed air passage and allowing the inside air to flow out through the air passage reliably and smoothly. And since it can be adhered to the storage space forming portion in a posture along the storage space forming portion of the packaging bag, even when the packaging bag is stacked at the time of storage or carrying out, it is avoided that the air passage is bent and closed. Therefore, the check valve function can always be exhibited reliably and satisfactorily.

The twelfth feature configuration of the present invention specifies a preferred embodiment in the implementation of the eleventh feature configuration.
A covering film having a vent is laminated outside the outer film, and the outer film and the covering film are bonded in a sealed state in a state where the vent of the covering film and the outer opening of the outer film communicate with each other. By this, it exists in the point in which the ventilation space which connects a vent hole and an outward opening part between the coating | coated film and an outer side film is formed.

  According to the above characteristic configuration, when the inside changes from positive pressure to negative pressure with respect to the outside, the outside air flows into the ventilation space from the ventilation hole of the covering film, so Air flow in the direction perpendicular to the outer film), and this air flow can press the outer side of the outer film inward to bring the outer film closer to the inner film. The road can be closed more quickly.

The thirteenth feature configuration of the present invention specifies a preferred embodiment in the implementation of any one of the eleventh and twelfth feature configurations.
The peeling inducing portion is provided with a convex portion that forms an air inflow space into which air from the inner opening can flow in at least one of the opposing surfaces of both films.

  According to the above characteristic configuration, when the inside changes from negative pressure to positive pressure with respect to the outside, air can smoothly flow from the inside into the air inflow space of the separation inducing portion through the inside opening. Therefore, the inflowing air can further alleviate the adhesive force between the two films at the peeling inducing portion, thereby allowing the inside air to flow out to the outside quickly.

The fourteenth feature configuration of the present invention specifies a preferred embodiment in the implementation of any one of the eleventh to thirteenth feature configurations.
The inner opening side end of the air passage in the inner film is configured to have higher hardness than the outer film.

  According to the above characteristic configuration, the inner side changes from negative pressure to positive pressure with respect to the outer side, and the inner side surface of the inner film facing the inner side and the inner side surface of the outer film facing each other across the air passage When the outward pressing force is generated by the inner air against the outer film, the amount of deformation of the inner film outward than the outer film is reduced, in other words, the outer film is moved outward than the inner film. Since the amount of deformation can be increased, the outer film can move relative to the outside relative to the inner film, and the air passage inlet can be expanded by the amount of the movement difference to allow air to flow into the separation inducing part. As a result, it is possible to further promote the peeling of the two films at the peeling inducing portion, and to more quickly discharge the inside air to the outside.

The fifteenth feature configuration of the present invention specifies a preferred embodiment in the implementation of any one of the eleventh to fourteenth feature configurations.
The inner film is provided with a filtering means capable of suppressing the contents in the bag of the packaging bag from entering the air passage through the inner opening.

  According to the above characteristic configuration, when the inside of the bag is at a positive pressure with respect to the outside of the bag, the air in the bag can be allowed to flow out in a state where the filtering means prevents the stored item from flowing out through the ventilation path. A packaging bag with a stop valve can be constituted.

The sixteenth feature configuration of the present invention specifies a preferred embodiment in the implementation of the fifteenth feature configuration.
The filtering means is configured such that one side thereof is bonded to the inner film at the inner opening side end of the air passage to form the peeling inducing portion.

  According to the above characteristic configuration, since the separation inducing part can be formed using the filtering means, the number of process types and the number of processes in the production process are reduced as compared with the case where the filtering means and the separation inducing part are formed separately. This can be advantageous in terms of production efficiency.

The seventeenth feature configuration of the present invention specifies a preferred embodiment in the implementation of any one of the eleventh to sixteenth feature configurations.
The inner opening is disposed at an intermediate position in the ventilation direction of the ventilation path, and the outer opening is formed at both positions in the ventilation direction of the ventilation path, respectively.
The peeling inducing portions are respectively provided at both end portions on the inner opening side of the air passage.

  According to the above characteristic configuration, when the inner side is positive with respect to the outer side, the inner opening disposed at the middle position of the air passage and the pair of outer openings formed at both sides in the air passage direction of the air passage For example, when one air passage is clogged or the separation inducing portion of one air passage is the inner air, the inner air can flow out through the two air passages formed by the air passage. Even if an unforeseen situation occurs, such as when the air does not peel off due to air pressure, the inside air can flow out through the other air passage, and this stabilizes the outflow function of the inside air. be able to.

The eighteenth characteristic configuration of the present invention specifies a preferred embodiment in the implementation of any of the eleventh to fifteenth or seventeenth characteristic configurations.
The said outer film is comprised by translucency, and the said peeling induction part is in the point comprised from the printing ink layer given to at least one of the said inner film or an outer film.

  According to the above-mentioned characteristic configuration, in the production process, the strip-inducing part is independently formed in the printing process by sequentially printing the strip-like part of the strip-shaped film while continuously transporting the strip-shaped film for the check valve configuration. Since the film can be continuously formed, the transport route and transport time of the belt-like film can be shortened, which can be advantageous in terms of production efficiency. Moreover, since the printing ink layer constituting the peeling inducing portion can be visually recognized from the outer surface through the translucent outer film, for example, the color type of the printing ink layer can be changed depending on the type of stored item or the sales destination. By changing, it is possible to improve discrimination.

  Embodiments of the present invention will be described below with reference to the drawings. In the first to fifth embodiments, the storage space forming portion b1 of the packaging bag B corresponds to the covering film having the twelfth characteristic configuration of the present invention, and the slit portion b2 of the packaging bag B is the twelfth embodiment of the present invention. Corresponds to a vent in the characteristic configuration.

[First Embodiment]
FIGS. 1-8 shows embodiment of the packaging bag with a non-return valve of this invention, and both films are attached to the packaging bag B sealed in the state which accommodates granular materials, such as a powder basket, by the adhesive force of films. The air passage 4 is held in the closed state to prevent the outside air Ao from flowing into the bag inside Vi, and the two films in the closed state are peeled off by the air pressure of the air Ai in the bag, thereby allowing the inside of the bag to pass through the air passage 4. A check valve T that allows the air Ai to flow out of the bag Vo is provided.

  The packaging bag B is heat-sealed in a bag shape having a powder inlet and a storage space using a plastic film such as PE having a light transmitting property and an air tightness (in this embodiment, a thickness of about 35 μm). After the storage space is filled with a predetermined amount of powder particles, the inlet is heat-sealed and sealed. Among the plastic films constituting the packaging bag B, the front side or rear side or side side storage space forming part b1 corresponding to the storage space has a slit part b2 as a bag internal / external communication part consisting of a pair of parallel cuts. The bag inside Vi and the bag outside Vo are communicated with each other through the slit b2.

  The check valve T is formed by arranging a pair of rectangular inner films 2 made of a plastic film such as PE (thickness of about 35 μm in this embodiment) in a state of being slightly separated from each other in the longitudinal direction. The outer film 1 made of the same material and having the same shape as the inner film 2 is laminated across the gap in the width direction (inner opening 4A described later) from the outside, and the width direction end of the outer film 1 in the laminated portion The edge 1a and the edge 2a in the width direction of the inner film 2 are heat-sealed (this heat-sealed portion constitutes a heat-sealing line 7 shown in FIG. 3), and the outer film 1 and the inner film 2 are bonded. An air passage 4 is defined between the opposing surfaces, and an inward opening 4A is formed between adjacent edges of the inner films 2 at an intermediate position in the air passage direction of the air passage 4. At both ends of the ventilation direction of the passage 4, there are outer fibres. A pair of outer apertures 4B is formed between the longitudinal direction both end edges 1b facing portion of the inner film 2 facing thereto of beam 1.

  A portion of the inner film 2 extending from both ends on the inner opening side of the air passage 4 to the intermediate portion between the pair of outer opening 4B and the inner opening 4A is provided with a printing ink layer 5A. A peeling inducing portion 5 that relaxes the adhesion between the film 1 and the inner film 2 is configured.

  The printing ink layer 5A is formed on a rough surface having a large number of extremely small convex portions 5a by printing with a set thickness (in this embodiment, about 50 μm), and reduces the contact area with the outer film 1 and the outer film. A large number of air inflow grooves are formed as air inflow spaces in which air can flow in when in close contact with the air.

  Further, the hardness of the inner film 2 in the portion where the printing ink layer 5A is applied is made higher by the amount applied with the printing ink layer 5A than the hardness of the outer film 1, and the deformation amount with respect to the external force is smaller than that of the outer film 1. It is supposed to be.

  Furthermore, it is formed on the inner surface side of the inner film 2 with substantially the same length and width in the longitudinal direction as the laminated body of the pair of inner film 2 and outer film 1, and has a smaller diameter than a granular material that is an example of a stored item. A non-woven fabric 3 made of plastic fibers such as PE (an example of a filtering means) having a large number of holes (not shown) is laminated in a state of covering the inner opening 4A, and the outer peripheral portion 3a of the non-woven fabric 3 is formed in that state. The inner film 2 is heat-sealed to the inner surface (this heat-sealed portion constitutes the heat-seal line 7 shown in FIG. 3) so as to prevent the stored item from flowing into the inner opening 4A. It is.

  And the check valve T is in a superposition posture along the inner surface of the storage space forming portion b1, and the outer surface of the outer film 1 faces the slit portion b2, and the outer peripheral portion of the check valve T is stored in the storage space forming portion. The check valve T is attached to the packaging bag B by heat-sealing to the inner surface of b1 (this heat-seal portion constitutes the heat-sealing line 7 shown in FIG. 3). A ventilation space 6 is formed between the space forming portion b1 and the outer film 1 of the check valve T, and the slit portion b2 of the packaging bag B and the outer opening 4B of the check valve T communicate with each other through the ventilation space 6. By making the bag interior Vo communicate with the inner opening 4A of the check valve T, the bag exterior Vo and the bag interior Vi can communicate with each other via the check valve T and the slit b2. is there.

  In addition, the printing ink layer 5A constituting the peeling inducing part 5 is used in the production process of the check bag-equipped packaging bag when the bag material cutting operation and the heat welding operation are performed using a manufacturing machine. It is also used for phototube printing (phototube mark) for essential work position identification.

Next, the operation of the check valve T in the packaging bag with check valve will be described.
(A) Inflow suppression operation When the bag interior Vi becomes negative with respect to the bag exterior Vo, the outside air Ao, which is the positive pressure side air, is attracted to the bag interior Vi, and as shown in FIG. The air flows into the ventilation space 6 between the storage space forming portion b1 and the outer film 1 through the slit portion b2 of the storage space forming portion b1, and an air flow inward of the bag is generated in the ventilation space 6.

  Then, due to the air flow inward of the bag, as shown in FIG. 6 (b), it is arranged along the storage space forming portion b1 (that is, the film surface is arranged in a state of being almost perpendicular to the air flow. The outer surface of the outer film 1 at the check valve T is pressed against the inner film 2 by receiving the inward pressure of the bag due to the air flow, and the outer film 1 is opened outwardly by the pressure difference between the inside and outside of the bag. The airflow path 4 is closed while the outer film 1 and the inner film 2 are in close contact with each other, being drawn toward the inner film 2 side as indicated by the dotted arrow in the figure, with the facing portion facing the portion 4B as the center. The closed state of the air passage is firmly held by the adhesive force between 1 and the inner film 2, and the outside air Ao is prevented from flowing into the bag inside Vi through the air passage 4.

(A) Permissible outflow operation From the state of FIG. 6 (b), when the bag interior Vi becomes positive with respect to the bag exterior Vo due to the gas generated from the stored items or the compressive force generated by stacking the packaging bags B, The air Ai in the bag, which is the positive pressure side air, is attracted to the outside Vo of the bag, and the air Ai in the bag passes through the numerous holes 3b of the nonwoven fabric 3 as shown in FIG. The outer film part facing the inner opening 4A formed at the middle position in the ventilation direction is pressed outward with a uniform pressure. In addition, since the stored item inside the bag Vi cannot pass through the nonwoven fabric 3, the stored item does not flow out of the nonwoven fabric 3.

  The bag air Ai flows into a number of air inflow grooves between the pair of printing ink layers 5A and the outer film 1 in close contact with the pair of printing ink layers 5A. Due to the pressing force, the outer film 1 having a lower hardness than the inner film 2 to which the printing ink layer 5A has been applied is curved and deformed in a posture in which the central portion in the longitudinal direction protrudes outward from the bag, and the printing ink layer 5A and A gap 8 is formed between the outer film 1 and the outer film 1 facing each other, and the in-bag air Ai flows into the gap 8, so that the inflow air flows toward the both ends in the ventilation direction with the printing ink layer 5 </ b> A. The outer film 1 is separated.

  Further, the inflow air moves in the air passage 4 toward both ends in the air flow direction while pushing the outer film 1 and the inner film 2 apart, and as shown in FIG. 7 (B), a pair of outer openings 4B. Are opened to flow into the ventilation space 6 and flow out to the bag exterior Vo through the inner and outer communication portions b2 of the packaging bag B.

  In addition, since the outer surface of the outer film 1 faces the slit part b2 of the packaging bag B, for example, the accommodation space forming part b1 cannot be moved outward by storing the storage capacity of the set maximum capacity in the packaging bag B. Even in such a tension state, as shown in FIG. 8, the movement of the outer film 1 to the outside is not suppressed by moving the slit portion b <b> 2 to the outside. It is possible to release the closed state and allow the air Ai in the bag to flow out to the bag exterior Vo.

[Second Embodiment]
In this embodiment, as shown in FIGS. 9 to 14, the check valve T slightly separates a pair of rectangular outer films 1 made of a plastic film such as PE (thickness of about 35 μm in this embodiment) in the longitudinal direction. The inner film 2 having substantially the same shape and the same material as the outer film 1 is laminated in a state where the gap in the width direction (outer opening 4B described later) is formed from the inner side. In the laminated portion, the width direction edge 1a of the outer film 1 and the width direction edge 2a of the inner film 2 are heat-sealed (this heat-welded portion forms a heat-welding line 7 shown in FIG. 10). An air passage 4 is defined between the opposing surfaces of the outer film 1 and the inner film 2, and both end portions 2b of the inner film 2 in the longitudinal direction are provided at both ends of the air passage 4 in the air passage direction. Opposing portions of the opposing outer film 1 A pair of inner opening part 4A is formed between the, in the ventilation direction intermediate position of the air passage 4, the outer opening 4B is formed between the adjacent edges two outer film 1.

  The outer film 1 is provided with a printing ink layer 5A on the inner film 2 in the portion from the both ends on the inner opening side of the air passage 4 to the intermediate portion between the outer opening 4B and the inner opening 4A. The peeling inducing part 5 for relaxing the adhesion between the inner film 2 and the inner film 2 is configured.

  Moreover, the nonwoven fabric which is formed in the inner surface side of the inner film 2 by the length and the width | variety substantially the same as the laminated body of the inner film 2 and a pair of outer film 1, and is provided with many holes 3b smaller diameter than a stored thing. 3 (an example of filtering means) is laminated in a state of covering the pair of inner openings 4A, and the outer peripheral portion 3a of the nonwoven fabric 3 is heat-sealed to the outer peripheral portion of the inner surface of the laminated body (this heat-sealed portion is illustrated in FIG. 10 is configured to prevent the stored item from flowing into the inner opening 4A.

  Since the other configurations are almost the same as those described in the first embodiment, the same components are denoted by the same reference numerals and the description thereof is omitted.

  Next, the operation of the check valve T in the packaging bag with check valve will be described. Note that the outflow suppression operation shown in FIGS. 13A and 13B is substantially the same as the content described in the first embodiment, and thus the description thereof is omitted.

(B) Allowable outflow operation From the state of FIG. 11 (b), when the bag interior Vi becomes positive with respect to the bag exterior Vo due to the gas generated from the stored items or the compressive force generated by stacking the packaging bags B, The air Ai in the bag, which is the positive pressure side air, is attracted to the bag outside Vo, and the air Ai in the bag passes through the numerous holes 3b of the nonwoven fabric 3 as shown in FIG. The outer film portions facing the pair of inner openings 4A formed at both ends in the ventilation direction are pressed outward with a uniform pressure.

  The bag air Ai flows into a number of air inflow grooves between the pair of printing ink layers 5A and the outer film 1 in close contact with the pair of printing ink layers 5A. Due to the pressing force, the outer film 1 having a lower hardness than the inner film 2 to which the printing ink layer 5A has been applied is curved and deformed into a posture in which the vicinity of both end portions in the longitudinal direction protrudes outward from the bag. A gap 8 is formed between 5A and the outer film 1 opposite to the gap 5A, and the bag air Ai also flows into the gap 8 so that the inflow air flows from both ends in the ventilation direction toward the middle position in the ventilation direction. The printing ink layer 5A and the outer film 1 are separated from each other.

  Further, the inflowing air moves in the air passage 4 toward the middle position in the air flow direction while pushing and separating the outer film 1 and the inner film 2 in close contact with each other, and as shown in FIG. The part 4B is opened and flows into the ventilation space 6, and flows out to the bag exterior Vo through the slit part b2 of the packaging bag B.

  Since the operation of the check valve T in the other packaging bag with a check valve is the same as the content described in the first embodiment, the description thereof is omitted.

[Third Embodiment]
In this embodiment, as shown in FIGS. 15 to 20, the check valve T is formed by compressing the first bent groove 1 c that allows outward bending, in the middle in the longitudinal direction across the both edges 1 a in the width direction. A rectangular outer film 1 made of a plastic film such as PE (thickness of about 35 μm in this embodiment) and a second bent groove 2c that allows outward bending are provided in the middle in the longitudinal direction across the widthwise two end portions 2a. A rectangular inner film 2 made of a plastic film such as PE (thickness of about 35 μm in this embodiment) formed by compression on the inner film 2 with the second bent groove 2c as a fulcrum, and The outer film 1 and the inner film 2 are laminated in a state where the first bent groove 1c of the outer film 1 and the second bent groove 2c of the inner film 2 are slightly separated in the longitudinal direction, and the outer film 1 of the laminated portion is laminated. The width direction both ends edge 1a and the inside The two side edges 2a in the width direction of the side film 2 are heat-sealed in a sealed state (this heat-fusion part constitutes a heat-sealing line 7 shown in FIG. 16), and the outer film 1 and the inner film 2 are bent. An air passage 4 is defined between the surfaces facing each other.

  In the air passage 4, an inner opening 4 </ b> A is formed between the bent end portion of the inner film 2 and the facing portion of the outer film 1 facing the inner film 2. An outward opening 4B is formed between the directional edge 1b and the facing portion of the bent portion of the inner film 2 facing it.

  On the inner surface side of the outer film 1, a portion closer to the longitudinal end 1 b on the side slightly away from the inner film 2 than the first bending groove 1 c is located at an intermediate portion between the outer opening 4 </ b> B and the inner opening 4 </ b> A. A peeling inducing portion 5 is provided to relieve the adhesive force between the outer film 1 and the inner film 2 by applying a printing ink layer 5A over the extending portion.

  Furthermore, on the inner surface side of the laminate of the inner film 2 and the outer film 1, a non-woven fabric 3 (which is formed with a length and width substantially the same as the laminate in the longitudinal direction and has a plurality of holes 3b having a smaller diameter than the stored item ( An example of the filtering means) is laminated in a state of covering the inner opening 4A, and the outer peripheral portion 3a of the nonwoven fabric 3 is heat-sealed to the inner surface of the outer peripheral portion of the laminated body in this state (this heat-welded portion is illustrated in FIG. 16 is configured to prevent the stored item from flowing into the inner opening 4A.

  Since the other configuration is the same as that described in the first embodiment, the same number is assigned to the same component and the description thereof is omitted.

  Next, the operation of the check valve T in the packaging bag with check valve will be described. The inflow suppression operation shown in FIGS. 19 (a) and 19 (b) is substantially the same as the content described in the first embodiment, and therefore the description thereof is omitted.

(A) Allowable outflow operation From the state of FIG. 19 (b), when the bag interior Vi becomes positive pressure with respect to the bag exterior Vo due to the gas generated from the stored items or the compressive force generated by stacking the packaging bags B, The bag-inside air Ai, which is positive pressure side air, is attracted to the bag outside Vo, and the bag-inside air Ai passes through the numerous holes 3b of the nonwoven fabric 3 as shown in FIG. The ink flows into a large number of air inflow grooves formed between the ink layer 5A and the inner film 2 in close contact therewith.

  Then, the inflowing air separates the printing ink layer 5A from the bent portion of the inner film 1 toward the outside in the ventilation direction (that is, the front end side of the bent portion), and the inflowing air is in a close contact state. The outer film 1 and the inner film 2 are pushed apart, and the outer film 1 is bent slightly outward with the first bent groove 1c as a fulcrum, and the air passage 4 is directed outwardly in the air flow direction (that is, on the distal end side of the bent portion). As shown in FIG. 20 (b), the outer opening 4B is opened and flows out into the ventilation space 6, and then flows out into the bag outside Vo through the slit b2 of the packaging bag B.

  The operation of the check valve T in other packaging bags with a check valve is substantially the same as the contents described in the first embodiment, and thus the description thereof is omitted.

[Fourth Embodiment]
In the second embodiment described above, the printing ink layer 5A constituting the peeling inducing portion 5 is provided on the inner film 2 positioned at both ends of the air passage 4 on the inner opening side. You may provide 5 A of printing ink layers which comprise the peeling induction part 5 in the outer side film 1 located in an opening part both ends.

  In this embodiment, as shown in FIG. 21 to FIG. 23, the inside of a portion extending from both ends of the air passage 4 to the inner opening side between the pair of outer opening portions 4B and the inner opening portion 4A. The peeling induction part 5 which relieves the adhesive force of the outer side film 1 and the inner side film 2 by giving the printing ink layer 5A to the film 2 is comprised.

  Since the other configuration is the same as that described in the second embodiment, the same number is assigned to the same component and the description thereof is omitted.

Next, the operation of the check valve T in the packaging bag with check valve will be described. Note that the inflow suppression operation shown in FIGS. 22A and 22B is the same as the content described in the first embodiment, and a description thereof will be omitted.
(A) Permissible outflow operation From the state of FIG. 22 (b), when the bag interior Vi becomes positive with respect to the bag exterior Vo due to the gas generated from the stored items or the compressive force generated by stacking the packaging bags B, The bag-inside air Ai, which is the positive pressure side air, is attracted to the bag outside Vo, and as shown in FIG. 23 (a), the bag-inside air Ai passes through the numerous holes 3b of the non-woven fabric 3 to form a pair of printing ink layers 5A. It flows into a number of air inflow grooves between the inner film 2 and the inner film 2 in close contact therewith.

  Then, the inflowing air separates the printing ink layer 5A and the inner film 2 from the both ends in the ventilation direction toward the middle position in the ventilation direction, and further, the outer film 1 and the inner film 2 that are in close contact with each other. While being pushed and moved, each moves in the ventilation path 4 toward the middle position in the ventilation direction, opens the outer opening 4B and flows into the ventilation space 6 as shown in FIG. It flows out to the bag exterior Vo through b2.

  Since the operation of the check valve T in the other packaging bag with a check valve is the same as the content described in the first embodiment, the description thereof is omitted.

[Fifth Embodiment]
In the first embodiment described above, the outer opening 4B of the air passage 4 is formed on both sides of the inner opening 4A, but may be formed only on one side of the inner opening 4A. Good.

  In this embodiment, as shown in FIGS. 24 to 26, the check valve T includes a rectangular first inner film 2 </ b> A made of plastic film, and a second inner film 2 </ b> B having a smaller longitudinal length than the first inner film 2 </ b> B. A plastic film having a length in the longitudinal direction larger than that of the second inner film in a state in which the gaps in the width direction formed between the inner films 2A and 2B are straddled from the outside. A rectangular outer film 1 made of the laminated film is laminated, and both end edges 1a in the width direction of the outer film 1 of the laminated portion and both end edges 2a in the width direction of both inner films 2A and 2B are heat-sealed. An air passage 4 is defined between opposite surfaces of the first inner film 2A, and an inward opening 4A is provided between adjacent edges of the films 2A and 2B at an intermediate position in the air passage direction of the air passage 4. As it is formed An outer opening 4B formed by the longitudinal direction edge 1b of the outer film 1 and the opposing portion of the first inner film 2A opposite to the longitudinal edge 1b of the outer film 1 is formed at the end of the ventilation path 4 on the first inner film 2A side. Is formed.

  The first inner film 2 </ b> A at the end portion on the inner opening side of the air passage 4 is provided with a printing ink layer 5 </ b> A as a peeling inducing portion for relaxing adhesion to the outer film 1 on the inner opening portion side of the air passage 4. While applying from the edge 2b to the intermediate portion between the outer opening 4B and the inner opening 4A, also on the second inner film 2B at the inner opening side end opposite to the air passage 4, The printing ink layer 5A is applied from the inner opening side end portion to the middle portion in the longitudinal direction.

  Note that the other configurations and the operation of the check valve T (the inflow suppression operation shown in FIGS. 25 (A) and 25 (B) and the outflow allowable operation shown in FIGS. 26 (A) and 26 (B)) are the first. Since the contents are substantially the same as those described in the embodiment, the same components are denoted by the same reference numerals, and the description thereof is omitted.

[Sixth Embodiment]
In the first embodiment described above, the check valve T is attached to the inner surface of the storage space forming portion b1 in a posture along the storage space forming portion b1 of the packaging bag B. You may attach to the outer surface of the storage space formation part b1 with the attitude | position which follows.

  In this embodiment, as shown in FIGS. 27 to 31, the check valve T is in a posture along the storage space forming portion b1 and the inner surface of the air passage 4 faces the slit portion b2. The check valve T is attached to the packaging bag B by heat-sealing the outer periphery of T to the outer surface of the storage space forming portion b1, and the slit portion b2 of the packaging bag B and the inward opening of the check valve T 4B is communicated, and the bag exterior Vo and the outer opening 4A of the check valve T are communicated to communicate the bag exterior Vo and the bag interior Vi via the check valve T and the slit b2. It is configured.

  Further, on the inner surface side of the storage space forming part b1, there are many holes (not shown) that are formed with substantially the same length and width in the longitudinal direction as the pair of the inner films 2 arranged side by side. The formed nonwoven fabric 3 is heat-sealed to the inner surface of the storage space forming portion b1 with the outer peripheral portion 3a covered with the slit portion b2 of the packaging bag B from the inside of the bag, and stored in the bag interior Vi. The stored item is prevented from flowing out to the bag exterior Vo through the slit b2 of the packaging bag B.

  Since the other configuration is the same as that described in the first embodiment, the same number is assigned to the same component and the description thereof is omitted.

Next, the operation of the check valve T in the packaging bag with check valve will be described.
(A) Inflow restraining operation When the bag interior Vi becomes negative with respect to the bag exterior Vo, as shown in FIG. 30 (a), it faces the outer opening 4B of the outer film 1 due to the pressure difference inside and outside the bag. As shown in FIG. 30 (b), the air passage 4 is closed with the outer film 1 and the inner film 2 being in close contact with each other, as shown by the dotted arrow in the figure. Then, the closed state of the air passage is firmly held by the adhesive force between the outer film 1 and the inner film 2, and the outside air Ao is prevented from flowing into the bag inside Vi through the air passage 4.

(B) Allowable outflow operation From the state of FIG. 30 (b), when the bag interior Vi becomes positive with respect to the bag exterior Vo due to the gas generated from the stored items or the compression force generated by stacking the packaging bags B, The in-bag air Ai, which is the positive pressure side air, is attracted to the bag exterior Vo, and the in-bag air Ai passes through many holes of the nonwoven fabric 3 as shown in FIG. The portion of the inner film 2 and the outer film 1 facing the storage space forming portion b1 is pressed outward with a uniform pressure. At this time, the stored item inside the bag cannot pass through the nonwoven fabric 3, so the stored item does not flow out of the nonwoven fabric 3.

  The bag air Ai flows into a number of air inflow grooves between the pair of printing ink layers 5A and the outer film 1 in close contact with the pair of printing ink layers 5A. Due to the pressing force, the outer film 1 having a lower hardness than the inner film 2 to which the printing ink layer 5A has been applied is curved and deformed in a posture in which the central portion in the longitudinal direction protrudes outward from the bag, and the printing ink layer 5A and A gap 8 is formed between the outer film 1 and the outer film 1 facing each other, and the in-bag air Ai flows into the gap 8, so that the inflow air flows toward the both ends in the ventilation direction with the printing ink layer 5 </ b> A. The outer film 1 is separated.

  Further, the inflowing air moves in the air passage 4 toward both ends in the air flow direction while pushing the outer film 1 and the inner film 2 in close contact with each other, as shown in FIG. Each side opening 4B is opened to flow out to the bag exterior Vo.

[Another embodiment]
In each of the above-described embodiments, the peeling inducing portion 5 is configured by applying the printing ink layer 5A to the inner film 1 or the outer film 2, but the printing ink layer 5A is applied to both the inner film 1 and the outer film 2. The peeling inducing portion 5 may be configured.

  In each of the above-described embodiments, the peeling inducing portion 5 is configured by applying the printing ink layer 5A to the inner film 1 or the outer film 2, but for example, at least one of the inner film 1 or the outer film 2 may be a nonwoven fabric or the like. It may be configured to adhere to the peeling inducing part, or to induce peeling by applying a low-viscosity inert liquid such as silicone oil, or by attaching a large number of extremely small objects such as powder or thread You may comprise a part.

  As described above, when the peeling inducing part 5 is formed by adhering the nonwoven fabric to the inner film 1, the non-woven cloth constituting the peeling inducing part 5 is thicker than the inner film 2 or the outer film 1, What has the unevenness (convex part 5a) on the contact surface of the film is smaller in the contact area with the outer film 1, the effect of forming the air inflow space in the contact state with the outer film 1, and the hardness of the outer film 1. This is preferable in terms of increasing the hardness of the inner film 2 and reducing the adhesion between the outer film 1 and the inner film 2.

  Further, when the peeling inducing part 5 is formed by adhering the nonwoven fabric to the inner film 1, for example, as shown in FIG. 32, one side of the nonwoven fabric 3 as a filtering means having irregularities (convex parts 5a) on the surface. Is adhered to the inner film 2 located at the inner opening side end of the air passage 4, and the other side is adhered to the longitudinal end 1b of the outer film 1 so as to cover the inner opening 4A. Thus, if the non-woven fabric 3 as the filtering means is also used as the non-woven fabric constituting the exfoliation inducing part 5, the process type in the production process can be compared with the case where the filtering means and the exfoliation inducing part 5 are formed separately. The number of processes can be reduced.

  In each of the above-described embodiments, by applying the printing ink layer 5A to the inner opening side end, an air inflow groove is formed as an air inflow space through which air can flow in between the film and the film in close contact therewith. Although the convex portion 5a was configured, for example, the convex portion 5a may be configured by locally pressing at least one of the outer film 1 or the inner film 2 at the inner opening side end, The convex portion 5a may be configured by pasting another member having an uneven surface at the inner opening side end, and a small object such as powder or thread is pasted at the inner opening side end. By doing so, you may comprise the said convex part 5a.

  In the first, second, and fifth embodiments described above, the inner opening 2 side end of the inner film 2 is made to be more than the outer film 1 by applying the printing ink layer 5 </ b> A to the inner opening side end of the inner film 2. However, for example, the inner film 2 may be made of a plastic film having a thickness larger than that of the outer film 1, so that the inner film 2 may be made harder than the outer film 1. Alternatively, another member may be affixed to form a higher hardness than the outer film 1, and the inner film 2 may be formed of a plastic film having a higher hardness than the outer film 1.

  In each of the above-described embodiments, the inside / outside communication portion of the bag is configured by forming the slit portion 2a formed of two cuts parallel to the storage space forming portion b1, but for example, the through space is formed in the storage space forming portion b1. The inside / outside communication portion of the bag may be formed by forming the inside, and the inside / outside communication portion of the bag may be formed by forming a slit portion formed of one or a plurality of cuts.

  In each above-mentioned embodiment, the nonwoven fabric 3 as a filtration means was provided in the state which coat | covered the inner opening part 4A over the inner surface side of the inner film 2, or the inner surface side and outer surface side of the inner film 2. However, you may provide the nonwoven fabric 3 in the state which coat | covers 4 A of inner opening parts on the outer surface side of the inner side film 2. FIG.

The perspective view of the packaging bag with a non-return valve in 1st Embodiment of this invention. Exploded perspective view of check valve adhesion site Plan view of check valve adhesion site II sectional view (longitudinal direction sectional view) of FIG. II-II line sectional view of FIG. 3 (short direction sectional view) Schematic illustration of the operation to suppress the flow of outside air into the bag by the check valve Schematic illustration of the permissible flow of air in the bag to the outside of the bag by the check valve Cross-sectional view in the short-side direction of the check valve adhesion area when the check valve allows the air in the bag to flow out The disassembled perspective view of the check valve adhesion site | part of the packaging bag with a check valve in 2nd Embodiment of this invention. Plan view of check valve adhesion site II sectional view of FIG. 10 (longitudinal sectional view) II-II line sectional view of FIG. 10 (short direction sectional view) Schematic illustration of the operation to suppress the flow of outside air into the bag by the check valve Schematic illustration of the permissible flow of air in the bag to the outside of the bag by the check valve The disassembled perspective view of the check valve adhesion site | part of the packaging bag with a check valve in 3rd Embodiment of this invention. Plan view of check valve adhesion site FIG. 16 is a cross-sectional view taken along the line II (longitudinal cross-sectional view). II-II sectional view (cross-sectional view in the short direction) of FIG. Schematic illustration of the operation to suppress the flow of outside air into the bag by the check valve Schematic illustration of the permissible flow of air in the bag to the outside of the bag by the check valve Longitudinal cross-sectional view of a check valve adhesion site of a packaging bag with a check valve in the fourth embodiment of the present invention Schematic illustration of the operation to suppress the flow of outside air into the bag by the check valve Schematic illustration of the permissible flow of air in the bag to the outside of the bag by the check valve Longitudinal sectional view of a check valve bonding portion of a packaging bag with a check valve according to a fifth embodiment of the present invention. Schematic illustration of the operation to suppress the flow of outside air into the bag by the check valve Schematic illustration of the permissible flow of air in the bag to the outside of the bag by the check valve The disassembled perspective view of the non-return valve adhesion site | part of the packaging bag with a non-return valve in 6th Embodiment of this invention Longitudinal cross-sectional view of check valve adhesion site Cross-sectional view in the short direction of the check valve adhesion site Schematic illustration of the operation to suppress the flow of outside air into the bag by the check valve Schematic illustration of the permissible flow of air in the bag to the outside of the bag by the check valve Longitudinal cross-sectional view of a check valve adhesion site of a packaging bag with a check valve in another embodiment of the present invention Longitudinal cross-sectional view of the check valve adhesion part of a conventional packaging bag with check valve Schematic illustration of the operation to suppress the flow of outside air into the bag by the check valve Schematic diagram for explaining the permissible outflow operation of air inside the bag by the check valve

Explanation of symbols

B Packaging bag b1 Storage space formation part b2 Slit part (Bag inside and outside communication part)
T check valve 1 outer film 2 inner film 3 non-woven fabric (filtering means)
4 Ventilation path 4A Inner opening 4B Outer opening 5 Separation inducing part 5A Printing ink layer 5a Convex part Vo Bag outside Ao Outside air Vi Bag inside Ai Bag inside air 6 Ventilation space

Claims (18)

A bag-inside / outside-communication part that allows the inside and outside of the bag to communicate with each other is formed in an airtight packaging bag, and the air passage between the two films is closed inside or outside of the inside-and-outside bag communication part. The air in the bag is prevented from flowing into the bag while being held in the state, and the air in the bag is allowed to flow out of the bag through the ventilation path by peeling off both films in the closed state by the air pressure of the bag air. It is a packaging bag with a check valve provided with a check valve,
The check valve is configured by adhering the laminated outer film and inner film in a state in which an air passage is defined between the opposing surfaces of the two films, and the air passage includes the outside of the bag or the bag. An outer opening that communicates with the inner and outer communication portions and an inner and outer communication portion that communicates with the bag or an inner opening that communicates with the bag are formed. While being provided with a peeling inducing part that induces peeling of both films in a close contact state by relaxing the adhesive force between the film and the inner film,
The check valve is in a state in which the outer opening or the inner opening communicates with the inner and outer communication portions of the packaging bag, and in a posture along the storage space forming portion that forms the storage space of the packaging bag. A packaging bag with a check valve adhered to the storage space forming part.   The check valve according to claim 1, wherein the peeling inducing portion is provided with a convex portion that forms an air inflow space into which air from the inward opening can flow in at least one of the opposing surfaces of both films. Packaging bag.   The packaging bag with a check valve according to claim 1 or 2, wherein an inner opening portion side end portion of the air passage in the inner film is configured to have higher hardness than the outer film.   4. With a check valve according to any one of claims 1 to 3, further comprising a filtering means for preventing a stored item in the bag of the packaging bag from entering the air passage through an inner opening. Packaging bag.   5. The non-return check according to claim 4, wherein the filtering means is configured so that one side thereof is bonded to an inner film at an inner opening side end of the air passage to form the peeling inducing portion. Packaging bag with valve. The inner opening is disposed at an intermediate position in the ventilation direction of the ventilation path, and the outer opening is formed at both sides in the ventilation direction of the ventilation path, respectively.
The packaging bag with a check valve according to any one of claims 1 to 5, wherein the peeling inducing portions are respectively provided at both end portions on the inner opening side of the air passage.   The check valve is adhered to the inner surface of the storage space forming portion so that the outer opening and the bag internal / external communication portion communicate with each other between the storage space forming portion and the outer film. The packaging bag with a non-return valve according to any one of claims 1 to 6.   The check valve is bonded to the inner surface of the storage space forming portion, and the inside / outside communication portion of the bag has an opening or a notch in the airflow passage facing portion of the storage space forming portion facing the airflow passage. The packaging bag with a check valve according to any one of claims 1 to 7, which is formed and configured.   The check valve is bonded to the inner surface of the storage space forming portion, and the outer film and the outer film facing portion of the storage space forming portion facing the outer film are configured to be translucent, The packaging bag with a check valve according to any one of claims 1 to 4 or 6 to 8, wherein the peeling inducing portion is composed of a printing ink layer applied to at least one of the inner film and the outer film.   The check valve is bonded to the outer surface of the storage space forming part, the outer film is configured to be translucent, and the peeling inducing part is applied to at least one of the inner film or the outer film. The packaging bag with a check valve according to any one of claims 1 to 4, wherein the packaging bag is composed of a printing ink layer. By holding the air passage between the films in a closed state by the adhesion between the films to prevent the inflow of outside air into the inside, and by peeling both films in the closed state by the air pressure of the inside air A check valve that allows the outside air to flow outward through the air passage,
The laminated outer film and inner film are bonded to each other in a state in which an air passage is defined between the opposing surfaces of the two films, and an outer opening that opens outward is formed in the air passage. An inner opening that opens in the direction is formed, and the inner opening side end of the air passage is further peeled off by relaxing the adhesion between the outer film and the inner film. With a delamination-inducing part that induces
The outer film or the inner film is communicated with a bag inner / outer communication portion capable of communicating the inside and outside of the bag formed in an airtight packaging bag with the outer opening or the inner opening. A check valve provided with a bonding allowance that can be bonded to the storage space forming portion in a state and in a posture along the storage space forming portion that forms the storage space of the packaging bag.   A covering film having a vent is laminated outside the outer film, and the outer film and the covering film are bonded in a sealed state in a state where the vent of the covering film and the outer opening of the outer film communicate with each other. The check valve according to claim 11, wherein a ventilation space is formed between the covering film and the outer film so as to communicate the vent and the outer opening.   The check according to claim 11 or 12, wherein the peeling inducing portion is provided with a convex portion that forms an air inflow space into which air from the inward opening can flow in at least one of the opposing surfaces of both films. valve.   The check valve according to any one of claims 11 to 13, wherein an end portion on the inner opening side of the air passage in the inner film is configured to have higher hardness than the outer film.   The inner film is provided with a filtering means capable of suppressing the contents in the bag of the packaging bag from entering the air passage through the inner opening. The check valve according to the item.   The non-return check according to claim 15, wherein one side of the filtering means is configured to form the peeling inducing portion by being bonded to an inner film at an inner opening side end portion of the air passage. valve. The inner opening is disposed at an intermediate position in the ventilation direction of the ventilation path, and the outer opening is formed at both sides in the ventilation direction of the ventilation path, respectively.
The check valve according to any one of claims 11 to 16, wherein the peeling inducing portion is provided at each of both end portions on the inner opening side of the air passage. The said outer film is comprised by translucency, The said peeling induction | guidance | derivation part is comprised from the printing ink layer given to at least one of the said inner film or an outer film. The check valve described.

Images