JP3015323B2 - Packaging bag - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for protecting a product from an outside by a gas filled in a buffer gas filling space formed between an outer surface of an inner bag having an article storage space and an inner surface of an outer bag. The present invention relates to a packaging bag capable of absorbing an external force such as an impact and storing an article stored in an article storage space in a state in which the article is hardly damaged.

[0002]

2. Description of the Related Art Conventionally, in a packaging bag of this type, an air bag is formed between an inner bag made of a synthetic resin film which is heat-sealed in a bag shape while forming an article storage space, and an outer surface of the inner bag. The outer bag made of a synthetic resin film that is heat-fused in a state of forming a buffer gas-filled space capable of containing Equipped with a valve body made of synthetic resin film in a flat tubular part made of resin film,
In addition, a thin and flexible check valve formed by heat-sealing the base end of one side surface and both left and right side surfaces of the valve body to the flat cylindrical portion, with the blowing port protruding outside. (See, for example, Japanese Patent Application Laid-Open No. 64-84869).
Reference). When the gas is blown into the gas-filled space from the inlet of the check valve, the check valve is disposed between the other side surface of the valve body and the inner surface of the flat cylindrical portion facing the other side surface of the valve body. A gap is formed, an air passage for filling the gas-filled space with gas from the outside is formed, and the inner surface of the gas-filled space filled with the gas has a flat cylindrical portion at the other side end of the valve body. The air passage is configured to be closed in close contact with the inner surface.

[0003]

However, in the conventional packaging bag, in addition to the synthetic resin film constituting the inner bag and the outer bag, the check valve having the check valve function is manufactured and prepared in advance. Before heat-sealing the required portions of the inner bag and the outer bag, a thin, flexible reverse between the opposing surfaces of the required portions along the periphery of the inner bag and the outer bag must be provided. Since the stop valve must be inserted and heat-fused while maintaining the insertion position and the insertion position, the structure for automating the bag manufacturing process becomes very complicated, and the manufacturing cost is likely to increase. . The present invention has been made in view of the above circumstances, and an object of the present invention is to manufacture a packaging bag having a high effect of preventing leakage of gas sealed in a gas sealing space in terms of manufacturing cost. The point is to do so.

[0004]

According to a first aspect of the present invention, there is provided a packaging bag comprising a synthetic resin film joined in a bag shape in a state of forming an article storage space. A packaging bag in which an outer bag made of a synthetic resin film is joined to the inner bag in a state in which a buffer gas-filled space capable of filling a gas between the inner bag and the outside of the inner bag is formed. In the synthetic resin film, a part of the polymerized portion of the synthetic resin film is joined between the facing surfaces of the polymerized portion corresponding to the gas-enclosed space, and ventilation for filling the gas-enclosed space with gas from the outside is provided. A passage is formed separately from the article storage space, and the polymerized portions of the synthetic resin film forming the air passage are brought into close contact with each other by the internal pressure of the gas-enclosed space in which gas is sealed, so that the air passage is airtight. Check valve membrane that closes with Together with the synthetic resin of the inner bag Fi
Specific location between the facing surface of the lum and the outer bag with the synthetic resin film
The weight of the articles stored in the article storage space.
The buffer width of the gas-filled space filled with gas is maintained at a specified width.
That is, a buffer width maintaining means is provided . According to the above-mentioned characteristic configuration, of the synthetic resin film of the inner bag, the gas can be filled in the gas-filled space through the air passage defined between the facing surfaces of the overlapping portions corresponding to the gas-filled spaces. When the gas is sealed in the gas-filled space, the internal pressure of the gas-filled space increases, and this pressure causes the check valve membranes formed of the polymerized portion of the synthetic resin film forming the air passage to adhere to each other. As a result, the air passage is closed in an airtight state, so that it is possible to prevent the gas in the gas filled space from leaking outside through the air passage. Therefore, in the synthetic resin film of the inner bag, a part of the polymerized portion of the synthetic resin film is joined between the facing surfaces of the polymerized portion corresponding to the gas-enclosed space, and the gas is filled from outside into the gas-enclosed space. The air passage for forming the air passage is separately formed from the article storage space, and the polymerized portions of the synthetic resin film forming the air passage are also used as the check valve membrane. There is no need to prepare a flexible check valve body with a check valve function made of synthetic resin other than the synthetic resin film that constitutes the outer bag. Since there is no need for a process of inserting and placing the space between the opposing surfaces at required locations along the peripheral edge of the package, a packaging bag having a high effect of preventing leakage of gas sealed in the gas sealing space can be advantageously manufactured. Can be manufactured.

Further, in the above-mentioned characteristic configuration, when storing articles in the article storage space and storing or displaying the packaging bag in which gas is sealed in the gas sealing space, the articles stored in the article storage space are stored. By weight, the article together with the synthetic resin film portion of the inner bag constituting the article storage space,
Even if an attempt is made to sink toward the inner and lower surfaces of the outer bag, the sink is regulated by the buffer width maintaining means, and as a result, the buffer width of the gas-filled space in which gas is sealed can be maintained at a predetermined width. . Therefore, regardless of the weight of the articles stored in the article storage space, external force such as external impact can be absorbed by the gas sealed in the gas sealing space, and the articles stored in the article storage space can be absorbed. It can be stored in a state that is not easily damaged.

According to a second aspect of the present invention, there is provided a packaging bag, wherein a sealed non-joined portion is formed between at least one set of base films among a plurality of joined base films. The laminated film is heat-sealed in a bag shape, and the gas-filled space is formed with the non-joined portion, and the inner bag is formed of a base material film located inside the non-joined portion, Further, the outer bag is formed of a base film located outside the non-joined portion, and the inner base film constituting the inner bag is provided between the opposing surfaces of the superposed portion of the inner base film. A notch is formed to allow the formed air passage to communicate with the gas-filled space that is exposed through the non-joined portion. In the above feature configuration, during the production of a laminated film composed of a plurality of base films, a non-bonded portion in a sealed state between at least one set of base films among the plurality of base films bonded with an adhesive. Just by forming, the gas-enclosed space can be revealed with the non-joined part, and at the time of manufacturing the laminate film, the cut is formed in the inner base material fill, so that the manufactured laminate film can be formed into a bag shape. While being heat-sealed, the inner substrate film is polymerized in a state in which a ventilation path is formed separately from the article storage space between the opposing surfaces of the polymerization portion corresponding to the gas-enclosed space. A packaging bag can be manufactured only by heat-sealing a part of the part. Therefore,
Since only the non-joined portion and the cut are formed during the production of the laminated film, it can be carried out with a simple modification of the existing production equipment for the laminated film. In addition, during the production of a laminate film, a plurality of layers of the base film are closely adhered by a roller or the like, and the base film itself is thin and has a property of easily adhering to each other in a polymerized state.
For example, air enters at least the gas-filled space of the packaging bag as compared to a case where a packaging bag is manufactured by joining a separately manufactured inner bag made of a synthetic resin film and an outer bag made of a synthetic resin film. There is no or a small amount even if it enters,
It is possible to compactly store or pack the packaging bags in a stacked state before use.

A feature of the packaging bag according to a third aspect of the present invention resides in that the article storage space is divided into a plurality of sections with a joining portion forming the ventilation path. In the above-mentioned characteristic configuration, apart from the joining portion forming the air passage, the overlapping portion of the synthetic resin film in the synthetic resin film of the inner bag is provided between the facing surfaces of the overlapping portion corresponding to the gas-filled space. As compared with the case where the parts are joined and the article storage space is divided into a plurality of sections, the formation area of the article storage space can be made wider by the area of the joint portion where the article storage space is sectioned and formed.

According to a fourth aspect of the present invention, the packaging bag is characterized in that a break guiding portion for forming a break in an exhaust port for exhausting the gas sealed in the gas sealing space is formed. is there. In the above-described feature configuration, when an article is stored in the article storage space and gas is sealed in the gas sealing space, not only the polymerized portions of the synthetic resin film of the inner bag forming the ventilation path but also the gas sealing in which the gas is sealed. Because the superposed portions of the synthetic resin film of the inner bag forming the article storage space by the internal pressure of the space, and the synthetic resin film of the inner bag forming the article storage space and the articles in the article storage space are in close contact with each other, It is possible to make it difficult for the article to come out of the article storage space to the outside due to the adhesion. On the other hand, since it is difficult to remove the article from the article storage space if the gas is sealed in the gas filled space, when removing the article, a hole is opened in the outer bag to exhaust the gas sealed in the gas filled space. When the break guide is formed, the gas sealed in the gas filling space can be easily exhausted only by breaking the packaging bag from the break guide. Therefore, it is not necessary to prepare scissors or a knife for forming the exhaust port, and the article can be quickly and easily taken out of the article storage space.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

[First Embodiment] FIGS. 1 to 11 show a first embodiment of a packaging bag according to the present invention which can store an article A stored in an article storage space 1 in a state where it is hardly damaged by an external force such as an impact. A buffer gas capable of filling a gas into an inner bag 2 made of a synthetic resin film, which is joined in a bag shape in a state where the article storage space 1 is formed. Enclosure space 3
The outer bag 4 made of a synthetic resin film is joined in a state of forming the above, and, of the synthetic resin film 5 of the inner bag 2, between the facing surfaces of the superposed portion corresponding to the gas-filled space 3.
By joining a part of the polymerized portion of the synthetic resin film 5,
A ventilation path 7 for filling the gas-filled space 3 with gas from the outside is formed separately from the article storage space 1, and the polymerized portions of the synthetic resin film 5 forming the ventilation path 7 are separated by a gas-filled gas. The check valve membrane 8 is configured to be in close contact with each other by the internal pressure of the sealed space 3 and to close the air passage 7 in an airtight state.

As shown in FIGS. 1 to 5, the packaging bag comprises:
The thin-film first base film 9A made of nylon, the second base film 9B made of thin-film polyethylene, and the third base film 10 made of thin-film polyethylene are formed in this order by a dry lamination method described later. It consists of a rectangular laminated film 13 composed of three layers of base films 9A, 9B and 10 which are overlapped and joined by the first base film 9A and the first base film 9A among these base films 9A, 9B and 10. The second base film 9B and the entire superposed portion thereof are joined to each other, and the second base film 9B and the third base film 10 have a matte pattern in FIG. A portion indicated by H1 is joined to form a pair of sealed non-joined portions 11 in the longitudinal direction between the two base films 9B and 10 in the longitudinal direction. Of the third base film 10, to each of the portions corresponding to the non-bonded portion 11, are then cut 12 is formed consisting of the slit-like cuts across its width direction whole width. Further, a second portion corresponding to the non-joined portion 11
Among the overlapping portions of the base film 9B and the third base film 10, a plurality of specific places P (four places in the first embodiment) are connected to each other by the second base film 9B and the third base film 10. At the same time of joining.

[0011] The packaging bag contains the laminated film 1
3 is folded back so that the third base film 10 is on the inside, and the pair of non-joined portions 11 are opposed to each other with the overlapped portion of the third base film 10 interposed therebetween. 2 is joined by heat fusion in a bag shape, and is positioned closer to the opening 1A of the article storage space 1 than the cut 12 in the overlapped portion of the third base film 10; Ventilation path 7 and article storage space 1
Are formed in the width direction by straight lines along the depth direction and thermally bonded to each other (parts indicated by oblique lines H3 in FIG. 2). A portion (a portion indicated by a diagonal line H4 in FIG. 2) which is located closer to the opening 1A than the notch 12 and is a bottom of the article storage space 1 is joined by heat fusion linearly along the notch 12. It is formed. The gas-filled space 3 is constituted by the non-joined portions 11, and the inner bag 2 is constituted by a third base film 10 located inside the non-joined portion 11, 4 with the first base film 9A located outside the non-bonded portion 11 and the second base film 9A.
And a base film 9B. That is, the third base film 10 located inside the non-joined portion 11
Corresponds to the synthetic resin film 5 of the inner bag 2, and the portion 9 composed of two layers of the bonded first base film 9 </ b> A and second base film 9 </ b> B located outside the non-bonded portion 11 is , And corresponds to the synthetic resin film 6 of the outer bag 4.

The air passage 7 and the article storage space are provided on the surface of the third base film 10 among the opposing surfaces of the second base film 9B and the third base film 10 in the non-joined portion 11. In order to prevent the opposing surfaces of the second base material film 9B and the third base material film 10 from being heat-sealed with each other by the heat of fusion at the time of forming the compartments 1 and 2, the ink for preventing heat-sealing is used. (For example, mold ink or heat-resistant ink).

The overlapped portions of the third base film 10 forming the air passage 7 are in close contact with each other by the internal pressure of the gas-filled space 3 in which the gas is sealed, and the air passage 7 is closed in an airtight state. The valve membrane 8 is provided.

The gas filling space 3 will be described with reference to FIG. 9 (a). As shown in FIG. 9 (a), the gas is passed through the air passage 7 from one end located on the opening 1A side of the article storage space 1. When a gas (for example, air) is blown into the enclosing space 3, the check valve membranes 8 are separated from each other, and further, due to the presence of the heat-sealed portion H <b> 3 which partitions the article storage space 1 and the ventilation path 7 in the width direction, The cut of the cut 12 is separated and opened from this part, and the gas filling space 3 is allowed to be filled with the gas through the cut 12. After filling the gas-filled space 3 with the gas, the check valve membranes 8 adhere to each other due to the internal pressure of the gas-filled space 3 filled with the gas, and the air passage 7 is closed in an air-tight state. The gas sealed in the space 3 does not leak outside through the ventilation path 7. In addition, in a state where gas is sealed in the gas sealing space 3, when an external pressure is applied from outside the bag by an external force such as an impact,
Since the internal pressure of the gas filled space 3 rises, the check valve membranes 8 further firmly adhere to each other.

As shown in FIGS. 6 and 8 (b), when the article A is stored in the article storage space 1 and gas is sealed in the gas sealing space 3, the second bag of the inner bag 2 forming the ventilation path 7 is formed. Not only the polymerized portions of the three base film 10 but also the polymerized portions of the third base film 10 of the inner bag 2 of the inner bag 2 forming the article storage space 1 with the internal pressure of the gas-filled space 3 in which gas is filled, and
Third base film 1 of inner bag 2 forming article storage space 1
0 and the articles A in the article storage space 1 are in close contact with each other, and the adhesion force can prevent the article A from coming out of the article storage space 1 to the outside, and the articles stored in the article storage space 1 can be prevented. A is a gas-enclosed space 3 that is arranged opposite
Therefore, even if an external pressure is applied from outside the bag due to an impact or the like, the external pressure can be prevented from directly acting on the article A.

Further, since the specific portion P of the overlapping portion of the second base film 9B and the third base film 10 forming the one non-joined portion 11 is joined to each other, the article storage space is provided. 1 with the article A stored therein and the gas filled space 3 filled with gas,
Even if the packaging bag is stored or displayed with 1 as the lower side, since the inner bag 2 is hung by the outer bag 4 at the joint portion of the specific portion P, the weight of the article A stored in the article storage space 1
The article A sinks toward the inner / lower surface side of the outer bag 4 together with the portion of the third base film 10 located on the lower surface of the article A, and enters the inner surface of the second base film 9B which is the inner / lower surface. The contact between the third base film 10 and the third base film 10 can be restricted. Accordingly, in a state where the packaging bag is stored or displayed with the other non-joined portion 11 being on the lower side, gas is generated against the weight of the article A stored in the article storage space 1 at the joined portion of the specific location P. Among the buffer widths of the sealed gas filled space 3, a predetermined width that allows the buffer width W below the article A to be buffered by the gas sealed in the gas filled space 3 even when an external force is applied from below. The buffer width maintaining means 14 is configured so as to maintain the buffer width. In addition, the first
In the embodiment, the four specific portions P are provided. However, the number is not limited to this, and it is sufficient that at least one specific portion P is provided. Although not shown, the article A is stored in the article storage space 1.
, And the packaging bag is stored or displayed in a state where the gas is filled in the gas-filled space 3 erroneously, the non-joining portion 11 having the joining portion constituting the buffer width maintaining means 14 is mistakenly provided.
In order not to be on the lower side, for example, a precautionary note, a mark, or the like indicating the storage or display direction of the packaging bag may be provided on the outer peripheral surface of the outer bag 4 by means such as printing or sealing.

As shown in FIG. 11, one side edge in the width direction of the peripheral portion of the packaging bag is provided with the article A from the article storage space 1.
When removing the gas, a triangular notch 15 is formed as a notch 15 serving as a break guiding portion for breaking the exhaust port for discharging the gas sealed in the gas filled space 3.

FIGS. 3 to 5 show the second base film 9B and the third base film 9B in order to distinguish the non-joined portions 11 and P constituting the gas-filled space 3 from the joined portions. Although a gap is formed between the overlapped portion with the base film 10, the three-layer base film 9 A, 9 B, 10 is brought into close contact with a roller or the like during the production of the laminate film 13, and
Since the second base film 9B and the third base film 10 are thin, they have a property of easily adhering to each other in a polymerized state, so that air does not enter the gas-filled space 3 and the air passage 7 or Even if it enters, the amount is very small, and in fact, it is almost in close contact with the packaging bag before use.

Next, an example of manufacturing the laminated film 13 by a dry laminating method will be described. Although not shown, a portion 9 composed of two layers of a first base film 9A made of nylon and a second base film 9B made of polyethylene leads the band-shaped first base film 9A to the coating portion, and the inside of the tank. A coating roll and a rubber roll immersed in the adhesive apply the adhesive to the entire surface of one side of the first base film 9A, and the belt-like second base film 9B and the coating unit pass through a drying oven. The first base film 9A sent is guided to the laminating section, and these two base films 9A and 9B are bonded together by a heated metal roll and a rubber roll, then cooled by a cooling roll and wound around a first roll 16. Manufactured by taking.

Next, as shown in FIG. 12, a portion composed of two layers of the first base film 9A and the second base film 9B manufactured by the above-described process and wound on the first roll 16 ( Hereinafter, this will be referred to as a laminated portion.) 9 is supported at a predetermined position, and the laminated portion 9 fed from the first roll 16 is guided to the coating portion 17, and the adhesive 19 in the tank 18 is provided.
Roll 20 and rubber roll 21 immersed in water
Thus, the adhesive 19 is applied to one side surface of the second base film 9B. As shown in FIG. 13, a pair of concave portions 22 are formed in the outer peripheral surface of the coating roll 20 and at portions corresponding to the pair of non-joined portions 11 in the axial direction, and correspond to the concave portions 22. Adhesive 1 on part
9 is not transferred. Further, a projection 23 is provided in a portion of one of the recesses 22 corresponding to a joining portion constituting the buffer width maintaining means 14,
The portion corresponding to the protrusion 23 is configured so that the adhesive 19 is transferred. In the third base film 10 made of polyethylene fed from the second roll 24, a portion corresponding to the two non-joined portions 11 on one side of the laminated portion 9 facing the second base film 9B, Although not shown, the ink for preventing heat fusion is printed in advance, the third base film 10 fed from the second roll 24 is guided to the cutting section 25, and the slit-shaped cuts 12 are paired by the cutter 26. Form. Thereafter, the laminated portion 9 sent from the coating portion 20 via the drying furnace 27 and the third base film 10 sent from the cutting portion 25 are guided to the laminating portion 28, and these laminated portions 9 and After bonding the third base film 10 with the heating metal roll 29 and the rubber roll 30, it is cooled by the cooling roll 31, and the manufactured long laminated film 13 is wound around the third roll 32. Examples of the adhesive 19 include a urethane-based resin, a vinyl acetate-based resin, and a natural rubber, which are used after being dissolved in an organic solvent.

In this manufacturing method, since the width of the long laminate film 13 is set to a dimension corresponding to the development length of one packaging bag, the laminate film 13 unwound from the third roll 32 can be used. Then, it is cut between the non-joined portions 11 adjacent to each other in the longitudinal direction to form one laminated film 13 for forming one storage bag.

[Second Embodiment] FIG. 15 shows another embodiment of the packaging bag according to the first embodiment, wherein the joining portion constituting the buffer width maintaining means 14 may be provided at both non-joining portions 11. . In this case, the buffer width maintaining means 1
4, the storage or display posture of the packaging bag in which the article A is stored in the article storage space 1 and the gas is sealed in the gas sealing space 3 is subject to special restrictions such as a vertical relationship. Less.

The other configuration is the same as that of the first embodiment. Components having the same configuration or the same function as those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted. .

[Third Embodiment] FIG. 16 shows another embodiment of the packaging bag of the first embodiment. The packaging bag of the present invention does not have the buffer width maintaining means 14. You may. The other configuration is the same as that of the first embodiment. Components having the same configuration or the same function as the components described in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

[Fourth Embodiment] FIGS. 17 and 18 show another embodiment of the packaging bag of the first embodiment, in which the air passage 7 is formed at the center of the overlapping portion of the third base film 10 in the width direction. The article storage space 1 is divided into two divided article storage spaces 1 a with a heat-sealed portion (joining portion) forming the ventilation path 7. That is, in the packaging bag, the laminate film 13 is folded back so that the third base film 10 is on the inside, and the pair of non-joined portions 11
In a state where the laminated film 13 is opposed to the overlapped portion of the base film 10, both side edges in the width direction of the laminated film 13 (points indicated by oblique lines H2 in FIG. 17) are joined in a bag shape by heat fusion, and A portion of the overlapped portion of the material film 10 which is located closer to the opening 1A of the article storage space 1 than the cut 12 and which partitions the air passage 7 and the two divided article storage spaces 1a in the width direction (the hatched line H3 in FIG. 17) ) Is joined by heat fusion linearly along the depth direction, and further, in the overlapped portion of the third base film 10, it is located closer to the opening 1 </ b> A than the cut 12, and Each divided article storage space 1a
The portion (the portion indicated by the oblique line H4 in FIG. 17) serving as the bottom of
It is formed by joining by heat fusion linearly along the cut 12.

The other structure is the same as that of the first embodiment. Components having the same structure or the same functions as those described in the first embodiment are denoted by the same reference numerals and description thereof is omitted. .

[Fifth Embodiment] FIGS. 19 to 21 show a fifth embodiment of a packaging bag according to the present invention.
Is formed in the inner bag 2 made of a synthetic resin film which is joined in a bag shape in a state in which a buffer gas filling space 3 capable of filling gas is formed between the inner bag 2 and the outer surface of the inner bag 2. An outer bag 4 made of a film is bonded, and one of the synthetic resin films 5 of the inner bag 2 is provided between the facing surfaces of the polymerized portions corresponding to the gas-filled spaces 3. Parts, and a ventilation path 7 for filling the gas-filled space 3 with gas from the outside is formed separately from the article storage space 1, and the polymerized portions of the synthetic resin film 5 forming the ventilation path 7 are joined together. The check valve film 8 is configured to be in close contact with each other by the internal pressure of the gas-filled space 3 in which the gas is filled, and to close the air passage 7 in an airtight state.

More specifically, in the packaging bag shown in the fifth embodiment, as shown in FIGS. 14 to 16, the inner bag 2 is made of a pair of thin, flexible, rectangular polyethylene films 35. The outer bag 4 is formed by thinning a first nylon base material film 36A having a length longer and the same width as that of the polyethylene film 35 constituting the inner bag 2.
And a thin film-like second base material film 36B made of polyethylene, and a pair of rectangular flexible laminate films 36 formed of two layers. In the state where the pair of polyethylene films 35 are sandwiched between a pair of laminated films 36 in which the second base film 36B is opposed to each other, the packaging bag holds one end in the longitudinal direction of the four films 35, 36 in the longitudinal direction. At the same time, the four films 35 and 36 are heat-sealed together at both side edges in the width direction (a location indicated by oblique lines H6 in FIG. 19), and one side edge in the longitudinal direction (FIG. 19).
At the position indicated by the oblique line H7).
6, the second base film 36B and the second base film 3
6B is thermally fused with the polyethylene film 35 in contact with the
Further, the other side edge in the longitudinal direction (a location indicated by a hatched line H8 in FIG. 19).
In step (2), the second base films 36B of the laminated films 36 facing each other are thermally fused to form a bag. Then, from this state, a part of the polymerized portion of the polyethylene film 35 (the portion shown by oblique lines H9 in FIG. 19) is formed in such a manner that the ventilation path 7 and the article storage space 1 are partitioned in the width direction.
A portion which becomes a bottom portion of the article storage space 1 in the superposed portion of the polyethylene film 35 while being heat-sealed linearly along the depth direction (a portion indicated by oblique lines H10 in FIG. 19).
Are heat-sealed linearly. That is, the gas-filled space 3 is exposed with a pair of non-joined portions of the laminated film 36 and the polyethylene film 35 which are arranged to face each other with the pair of polyethylene films 35 interposed therebetween.

The superposed portions of the polyethylene film 36 forming the ventilation path 7 for filling the gas-filled space 3 with the gas are brought into close contact with each other due to the internal pressure of the gas-filled space 3 in which the gas is filled. The check valve membrane 8 is closed in a gas-tight state. Further, the four rectangular films 35 and 36 are heat-sealed in a bag shape, and
When the gas storage space 1 and the article storage space 1 are partitioned and formed, the gas filled space 3 and the air passage 7 can communicate with each other through the inner end of the air passage 7.

Although not shown, at least one of the opposing surfaces of the laminate film 36 facing the second base film 36B and the polyethylene film 35 in the non-joined portion has the air passage 7 and the article storage space. 1 and the second base film 36
In order to prevent the opposing surfaces of B and the polyethylene film 35 from being heat-sealed, ink for preventing heat-sealing (for example, mold ink or heat-resistant ink) is applied.

In the fifth embodiment, all the joints are heat-sealed in a state where the four rectangular films 35 and 36 are overlapped.
5 are overlapped with each other, and a part of the overlapped portion is heat-fused linearly along the depth direction in a state where the ventilation path 7 and the article storage space 1 are formed in the width direction.
A portion of the superposed portion of the polyethylene film 35 which is to be the bottom of the article storage space 1 is heat-sealed linearly and then polymerized between a pair of laminated films 36 in which the second base films 36B are opposed to each other. With a pair of polyethylene films 35 having a part of the heat-sealed portions interposed therebetween, the four films 35 and 36 are aligned at one longitudinal edge of the four films 35 and 36, and the four films 35 and 36 are held together at both lateral edges. The second base film 36B of the laminated film 36 and the polyethylene film 35 in contact with the second base film 36B are heat-sealed at one longitudinal side edge, and at the other longitudinal side edge. The second base films 36B of the laminated films 36 facing each other may be thermally fused. In this case, the application of the ink for preventing heat fusion can be omitted.

The other configuration is the same as that of the first embodiment. Components having the same configuration or the same function as the components described in the first embodiment are denoted by the same reference numerals and description thereof is omitted. .

[Other Embodiments] In the packaging bags of the first to fourth embodiments, a part of the overlapping portion of the third base material fill 10 is formed by connecting the ventilation path 7 and the article storage space 1 in the width direction. In a state where the compartments are formed, heat fusion may be performed linearly over the entire length in the depth direction. in this case,
When the gas is filled through the ventilation path 7, the cut 12 at the end of the ventilation path 7 and the portion joined to the outer bag 4 are separated to form a gap, and the space is filled through the gap. The superposed portion of the third base film portions located on the extension of the ventilation path 7 is heat-sealed so that the gas flows into the gas-filled space 3. In the first to fourth embodiments, the first base film 9A made of nylon and the second base film 9 made of polyethylene are used.
Although the laminate film 13 having a three-layer structure in which B and the third base film 10 made of polyethylene are joined has been described as an example, the laminate film 13 is not limited to the three-layer structure. And a two-layer structure of a base film made of polyethylene and a base film made of polyethylene. In this case, a non-joined portion in a sealed state is formed between both base films. That is, the number of laminated base films may be appropriately selected according to the purpose of use. In the first to fourth embodiments, the first base film 9A made of nylon and the second base film 9 made of polyethylene are used.
Although the laminate film 13 composed of a three-layer structure in which B and the third base film 10 made of polyethylene are joined has been described as an example, the present invention is not limited to this material. A three-layer structure of a first base film, a second base film made of vapor-deposited polyester, and a third base film made of polyethylene,
There are a three-layer structure of a base film, a second base film made of vapor-deposited polyester and a third base film made of polyethylene, and the material of the base film may be appropriately selected according to the purpose of use. In the first to fourth embodiments, the laminate film 13 is manufactured by a dry lamination method. However, the present invention is not limited to this manufacturing method. For example, a wet lamination method, an extrusion lamination method, a hot melt lamination method And a co-extrusion lamination method. In the fifth embodiment, the synthetic resin film 5 of the inner bag 2 is made of a polyethylene film 35 and the outer bag 4
The synthetic resin film 6 described above is described by taking as an example a laminate film 36 having a two-layer structure in which a first base film 36A made of nylon and a second base film 36B made of polyethylene are joined. However, the present invention is not limited to this configuration. For example, the synthetic resin film 6 of the outer bag 4 may be formed of a single polyethylene film, and the synthetic resin film 6 of the inner bag 2 may be formed of a polyethylene film. The synthetic resin film 6 of the outer bag 4 is constituted by a two-layer laminated film in which a first base film made of polypropylene and a second base film made of vapor-deposited polyester are joined, or The synthetic resin film 5 of the bag 2 is made of a polyethylene film, and the synthetic resin film 6 of the outer bag 4 is made of a first nylon resin.
It may be composed of a laminate film having a two-layer structure in which a base film and a second base film made of vapor-deposited polyester are joined. In the fifth embodiment, a specific portion between the opposing surfaces of the synthetic resin film 5 of the inner bag 2 and the synthetic resin film 6 of the outer bag 4 resists the weight of the article A stored in the article storage space 1. Alternatively, a buffer width maintaining means 14 for maintaining the buffer width of the gas filled space 3 in which the gas is filled at a predetermined width may be provided. In each of the above embodiments, all or some of the joints joined by heat fusion may be joined by bonding with an adhesive. In this case, even if the films to be joined are made of a material that cannot be thermally fused, they can be joined. In the above embodiments, a metal layer is deposited on a surface of the synthetic resin film 6 of the outer bag 4 corresponding to the outer surface of the packaging bag, or a strong paper such as kraft paper is attached. May be. In each of the above embodiments, a tongue-shaped sealing portion for sealing the opening may be integrally provided at a position corresponding to the opening of the article storage space 1.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a packaging bag according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway front view of a storage bag.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 2;

FIG. 5 is a sectional view taken along line VV of FIG. 2;

FIG. 6 is a longitudinal sectional view of a part corresponding to the article storage space in a state where articles are stored in the article storage space and gas is sealed in the gas sealing space.

FIG. 7 is a longitudinal sectional view of a portion corresponding to an air passage in a state where articles are stored in the article storage space and gas is sealed in the gas sealing space.

FIG. 8 (a) A cross-sectional view in the middle of filling the gas into the gas-filled space (b) A cross-sectional view in a state where the gas is filled in the gas-filled space

9A is a partially cutaway perspective view of a main part showing an open state of the ventilation path. FIG. 9B is a partially cutaway perspective view of a main part showing a closed state of the airflow path.

FIG. 10 is a perspective view showing a state before using the packaging bag.

FIG. 11 is a perspective view showing a use state of the packaging bag.

FIG. 12 is a schematic view showing a manufacturing method by a dry lamination method.

FIG. 13 is a perspective view showing an adhesive application step in a coating unit.

FIG. 14 is a perspective view showing a bonding step in a laminating unit.

FIG. 15 is a cross-sectional view of a packaging bag according to a second embodiment of the present invention.

FIG. 16 is a cross-sectional view of a packaging bag according to a third embodiment of the present invention.

FIG. 17 is a partially cutaway front view of a packaging bag according to a fourth embodiment of the present invention.

FIG. 18 is a cross-sectional view of a packaging bag.

FIG. 19 is an exploded perspective view of a packaging bag according to a fifth embodiment of the present invention.

FIG. 20 is a longitudinal sectional view of a packaging bag.

FIG. 21 is a cross-sectional view of a packaging bag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Article storage space 2 Inner bag 3 Gas-filled space 4 Outer bag 5 Synthetic resin film 6 Synthetic resin film 7 Ventilation passage 8 Check valve film 9A Base film 9B Base film 10 Base film 11 Non-joined part 12 Cut 13 Laminated film 14 Buffer width maintaining means 15 Break induction part A Article P Specific place W Buffer width

Claims (4)

(57) [Claims] 1. A buffer gas filling space capable of filling a gas between the inner bag made of a synthetic resin film and an outer surface of the inner bag which is joined in a bag shape while forming an article storage space. A packaging bag in which an outer bag made of a synthetic resin film is joined in a state in which the synthetic resin film of the inner bag is formed. A part of the superposed portion of the synthetic resin film is joined to form an air passage for filling the gas-filled space from the outside with a gas separately from the article storage space, and a superposed portion of the synthetic resin film forming the air passage. to each other, gas in close contact with each other in the inner pressure of the encapsulated gas-filled space with a certain configured to check valve membrane for closing the air passage in an airtight state, if the inner bag
Between the opposing surfaces of the synthetic resin film and the synthetic resin film of the outer bag
The weight of the articles stored in the article storage space
The buffer width of the gas-filled space in which gas is
A packaging bag provided with buffer width maintaining means for maintaining a constant width . 2. A laminated film in which a non-joined portion in a sealed state is formed between at least one set of base films among the bonded plural-layer base films, is thermally fused in a bag shape, The gas-filled space is configured with a non-joined portion, and the inner bag is formed of a base material film positioned inside the non-joined portion, and further, the outer bag is more than the non-joined portion. The inner base fill, which is formed of a base film located on the outside and forms the inner bag, has the air passage formed between the facing surfaces of the overlapping portions of the inner base fill and the non-joined portion. 1 Symbol placing packaging bag of claim notch communicating the gas filled space issued is formed. Wherein the claim wherein the article storage space with a joint portion to form the air passage is partitioned and formed in a plurality 1
Or the packaging bag of 2 . Wherein said gas-filled claims break induction part for breaking forming an exhaust port for exhausting the encapsulated gas is formed in the space 1, 2 or 3 packaging bag according.