JP2002240832A - Liquid filling and packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid filling and packaging bag in which a specified seal structure is provided on one edge of a bag body, and gas or liquid can be filled by a packaging machine of simple structure. SOLUTION: In the liquid filling and packaging bag, liquid is filled after an item to be packaged is housed, and a fluid feed passage (3) for filling fluid leading from the outside of the bag body to the inside thereof is formed in one edge at which films on face and back sides of the bag body overlap. An opening part (20) inside the fluid feed passage (3) has a function of tightly attaching the films on the face and back sides by the expanding deformation of the bag body by filling the liquid, and prevents leakage of the filled liquid thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid-filled packaging bag, and more particularly, to a packaging bag used for packaging fresh food, for example, for maintaining freshness of stored fresh food. The present invention relates to a fluid-filled packaging bag that can easily be filled with a gas or a liquid for packaging.

[0002]

2. Description of the Related Art As is well known, for example, gas-filled packaging
This is a package in which an inert gas such as nitrogen or oxygen is filled in a bag containing the food in order to prevent oxidation and maintain freshness in packaging of fresh food. In gas-filled packaging, usually, a bag made of a film is supplied to a sealing mechanism of a gas-filling and packaging machine, and is filled with gas when welding the mouth of the bag. That is, insert a gas supply pin of a thin tube for gas supply into the mouth of the bag containing the packaged product,
Gas is supplied from the gas filling pin to the inside of the bag during heat sealing with a belt-shaped heater or the like, and the hole of the gas filling pin pulled out after gas filling is further heat sealed. Further, in recent years, in the packaging of seafood, boiled vegetables and the like, as in the case of the gas filling described above, a packaging form in which a liquid such as salt water or broth is filled and enclosed is also used.

[0003]

By the way, in the above-mentioned filling or packing for filling with gas or liquid, when sealing the mouth of the bag, the films on the front and back are welded to each other and at the same time, the filling pin is inserted and pulled out. As a result, the sealing mechanism of the packaging machine is complicated, and the packaging machine itself is also becoming larger. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a specific sealing structure at one edge of a bag body such as a mouth, and to use a simpler packaging machine for gas or liquid. It is an object of the present invention to provide a novel fluid-filled packaging bag that can be filled.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, in the bag for fluid filling and packaging according to the present invention, a fluid supply passage for fluid filling is formed at one edge of the bag body.
By utilizing the expansion and deformation of the bag body at the time of filling the fluid, the adhesiveness of the front and back films overlapping in the fluid supply path is increased, and leakage from the fluid supply path is prevented.

[0005] That is, the gist of the present invention is to provide a fluid-filled packaging bag to be filled with fluid, wherein one edge of the bag body where the front and back films overlap is filled with fluid from the outside to the inside of the bag body. A fluid supply path for the fluid supply path is formed along the one edge portion, and an opening inside the fluid supply path has a function of bringing the front and back films of the fluid supply path into close contact with each other by expanding and deforming the bag body due to fluid filling. A fluid-filled packaging bag, comprising: The above-described fluid-filled packaging bag has the following two embodiments depending on the portion where the fluid supply path is formed.

A bag for fluid filling and packaging according to a first aspect of the present invention is the bag for fluid filling and packaging described above, wherein a fluid supply path is formed at the mouth or bottom of the bag body. , Consisting of two band-shaped seal portions extending from the side edge side of the bag body to portions deviated from each other and forming unwelded outer and inner openings respectively opened to the outside and the inside of the bag body, And, when the mouth or the bottom is viewed from the inside of the bag body, the outer opening and the inner opening are arranged at positions shifted from each other, so that the outer sealing portion is in an overlapping positional relationship. And the inner seal portion.

The bag for fluid filling and packaging according to the second aspect of the present invention is the bag for fluid filling and packaging described above, wherein a fluid supply path is formed at a side edge of the bag body. Is
A band-shaped seal portion extending from the mouth or bottom of the bag body along the side edge and forming an unwelded inner opening opened to the inside of the bag body, and the side edge of the bag body And, when the side edge portion is viewed from the inside of the bag body, the outer opening and the inner opening opened to the outside of the bag body are arranged at positions shifted from each other, The bag body is formed by the sealing portion and the side edge of the bag body which are in an overlapping positional relationship.

In the bag for fluid filling and packaging according to each of the above aspects, when the bag body is filled with a fluid, the bag body is located inside at the opening inside one end of the fluid supply path due to the expansion deformation of the bag body due to the internal pressure. A linearly polarized portion is formed starting from the end of the seal portion, and the films on the front and back of the portion corresponding to the fluid supply path are pressed in a direction in which they are in close contact with each other, with the linearly polarized portion as an axis. Force acts. Therefore,
In the fluid supply path, after the fluid is filled, the front and back films adhere more air-tightly according to the internal pressure of the bag body.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fluid-filled packaging bag according to the present invention will be described with reference to the drawings. FIGS. 1 to 5 are diagrams showing various examples of a fluid-filled packaging bag according to the first embodiment of the present invention in which a fluid supply path is formed at the mouth of a bag body.
Specifically, FIG. 1 is a perspective view showing an example of the appearance of the fluid-filled packaging bag according to the present invention. FIG. 2 is a side view showing the function of the seal portion in the mouth in a plan view. 3 to 5
FIG. 3 is a side view showing a plan view of various arrangement patterns of a seal portion and an opening in a mouth portion. FIG. 6 is a side view showing an example of the fluid-filled packaging bag according to the second embodiment of the present invention in which a fluid supply path is formed at a side edge of the bag body. Further, FIG. 7 is a side view showing an example of the shape of the mouth portion and an example of a gusset-shaped fluid-filled packaging bag. Hereinafter, in the description of the embodiment, the fluid-filled packaging bag is simply abbreviated as “bag”. In addition, for convenience, the upper part of the bag will be referred to as the mouth based on the drawings, and both edges adjacent to the edge of the bag on the mouth side will be described as left and right side edges in the illustrated state,
It does not limit the direction of the bag.

The bag of the present invention is a bag applied to a filling package in which a fluid (gas or liquid) is filled and the mouth is sealed by welding films on the front and back. In the bag of the present invention, the fluid is usually filled after the contents are stored. In the present invention, the products to be packaged include fish and shellfish,
In addition to meats, prepared dishes, liquid foods, and other foods, pharmaceuticals, industrial raw materials, and the like that should be preserved in a certain atmosphere are included. Furthermore, various articles which are easily deformed can be mentioned. On the other hand, among the fluids to be filled, as a gas, for example, an inert gas such as nitrogen or carbon dioxide is used when the purpose is to prevent oxidation of foods and the like. Alternatively, when maintaining the freshness of live fish or the like, oxygen or air having a high oxygen concentration is used. Further, when a bag is used as a cushion material for easily deformable articles, air is usually used. In addition, examples of the liquid to be filled include salt water and various cooking liquids for maintaining the freshness and flavor of fish and shellfish and prepared dishes.

The film constituting the bag of the present invention includes:
As long as it is a film that can be welded, various films can be used depending on the article to be packaged.For example, a film for food packaging is a low-density polyethylene obtained by copolymerizing ethylene and a specific α-olefin. A multilayer film containing a resin in a layer configuration is exemplified.

In the case of a multilayer film, the base film may be a polypropylene film (PP), a nylon (N
Y), polyethylene terephthalate film (PE
T), ethylene-vinyl alcohol copolymer (EVO
H), polyvinyl alcohol (PVA), and other films, as well as vinylidene chloride coated films. In particular, films based on nylon and polyethylene,
It is preferable because it has excellent bag-making properties and can be easily recycled.

[0013] The bag of the present invention is produced by the above-described film in the packaging of the above-mentioned article to be packaged using a well-known filling and packaging machine (packaging machine). As a bag-making method, a so-called two-side seal, three-side seal, and four-side seal may be used depending on the sealing method. For example, a pillow package, which is a type of three-sided seal, forms a cylindrical film by bending both side edges of a continuously supplied band-shaped film, overlapping at substantially the center in the width direction, and welding to form a cylindrical film. Is a packaging mode in which welding is performed orthogonally to the continuous direction and the operation of filling an article to be packaged is performed continuously.

[0014] The two-way seal is an operation for continuously supplying a cylindrical film that has been folded flat in advance, welding the upper and lower ends orthogonally to the continuous direction of the cylindrical film, and filling the inside of the cylinder with the article to be packaged. Is continuously performed, and a rectangular package as shown in FIG. 1, for example, having ear-shaped seal portions projecting from upper and lower ends can be obtained by such a packaging mode.
The four-sided seal is a packaging form in which two flat films are overlapped and welded around four sides.

The present invention is applicable to any packaging form, and the bag of the present invention is a single bag in which the film on the front and back of the bag body is overlapped so that the gas or liquid as described above can be more easily filled. A fluid supply path (3) (see FIG. 1) for filling fluid from the outside to the inside of the bag body is formed along the one edge at the edge. And the above-mentioned fluid supply path (3)
The inside opening (20) (see FIG. 1) has a function of bringing the films on the front and back of the fluid supply path (3) into close contact by expansion and deformation of the bag body due to fluid filling. Thus, leakage of the filled fluid can be prevented, and the fluid and the article to be packaged can be sealed in the bag body. As described in detail below, there are two aspects of the present invention depending on the formation site of the fluid supply path (3).

First, the bag according to the first embodiment, in which a fluid supply passage is formed at the mouth or bottom as one edge of the bag body, will be described with reference to an example in which the bag is applied to gas filling packaging. The bag illustrated in FIGS. 1 and 2 is a bag in which a fluid supply path is formed at the mouth of the bag main body. In such a bag, gas can be easily filled after storing the article to be packaged. The mouth portion is provided with two outer and inner band-shaped seal portions (1, 2) extending from the side edge side of the bag body to portions shifted from each other. A fluid supply path (3) is configured. In addition, at least a part of the mouth portion along the extension direction of each seal portion (1, 2) has an unwelded outer portion and an outer portion which are respectively opened to the outside and the inside of the bag body for filling the bag body with gas. Inner openings (10, 20) are provided, respectively. That is, 2
The opening (10,
20) is configured.

The two seal portions (1, 2) can be formed by an ultrasonic welding device, but usually, a pressing member of a heat sealer (a sealing mechanism including a pressing member that can be heated by a heater) of a packaging machine. Is formed in a predetermined pattern by the arrangement of the. The bag shown in FIG. 1, FIG. 2 and FIG. 3 (a) has a sealing portion (1, 2) formed at the mouth and an opening (10, 10).
The arrangement pattern of 20) is the same bag, and the seal portion (1) is formed shorter, for example, from the left side edge toward the right as shown in FIG. The seal portion (2) is formed to be long from the right side edge (not shown) to the vicinity of the left side edge. The unwelded part on the right side of the tip of the seal part (1) is the outer opening (10), and the unwelded part on the left side of the tip of the seal part (2) is the inner opening (20).

In the present invention, when viewed from the inside of the bag body toward the mouth, the outer opening (10) and the inner opening (20) are arranged at positions shifted from each other, The fluid supply passage extending from the outer opening (10) to the inner opening (20) is provided between the outer sealing portion (1) and the inner sealing portion (2) in a mutually overlapping positional relationship. (3) is formed. With such a configuration, in the bag of the present invention, gas can be filled after sealing, and leakage of the filled gas can be prevented. Note that the overlapping positional relationship between the seal part (1) and the seal part (2) is the same as in the openings (10, 20) when viewed from the inside of the bag body toward the mouth. Refers to the positional relationship of the overlapping state.

The width of the seal portion (1, 2) is set to an appropriate width capable of exhibiting the necessary welding strength based on the mass of the packaged product, the material of the film, the internal pressure, and the like. The maximum length of the seal portions (1, 2) is within the range of the width of the mouth (the length of the mouth in the drawing), and the opening ( 10, 20), and
The minimum length of the seal portions (1, 2) is such that the outer seal portion (1) and the inner seal portion (2) overlap by the following length.

That is, from the viewpoint of preventing leakage of the charged gas, the overlap length (L1) of the outer seal portion (1) and the inner seal portion (2), in other words, the fluid supply passage (3) Has a length (L1) of 3 mm or more, preferably 5 mm
The minimum width (L2) of the fluid supply passage (3) between the seal portion (1) and the seal portion (2) is set to 15 as described above.
mm or less, preferably 10 mm or less. Further, from the viewpoint of efficiently filling the gas, it is preferable that the minimum width (L2) of the fluid supply path (3) is set to 5 mm or more.

In the bag of the present invention, after the article to be packaged is accommodated in the bag body, two seal portions (1, 1) are heat-sealed.
The opening is sealed by forming 2). And
When forming the seal portions (1, 2) or after forming the seal portions (1, 2), as shown in FIG. 2, a filling nozzle (5) is inserted into the opening (10) between the front and back films. Upon insertion, the bag body is filled with the required gas. In gas filling, since the film itself is not deformed at first, the fluid supply path (3) can be easily expanded by blowing gas from the filling nozzle (5), and the fluid supply path (3) and the opening can be opened. Gas can be easily filled through the part (20).

When the bag body is filled with gas by the above-described operation, in the bag of the present invention, as the bag body expands and deforms, the seal portions (1, 2) are pulled toward the center of the bag body. The end portion outside the seal portion (1, 2), that is, the edge protruding like an ear, is wrinkled and cramped (see FIG. 1). On the other hand, the two seal portions, that is, the outer seal portion (1) and the inner seal portion (2), which are in a positional relationship overlapping each other, increase the rigidity in the fluid supply path (3), and the front and back films are not formed. The shape of the fluid supply path (3) is maintained in a state of close contact.

On the other hand, as shown in FIG. 2, when the bag body is filled with gas, an inner opening (20) located at one end of the fluid supply passage (3) has an inflation of the bag body due to internal pressure. Due to the deformation, starting from one end portion (portion indicated by reference numeral (A)) of the inner seal portion (2), for example, it reaches a portion (portion indicated by reference numeral (B1)) of the seal portion (1) opposed to the starting point. A linear polarization part (S) is formed. Depending on the size of the opening (20) and the like, the polarized portion (S) is formed toward a part of the side edge of the bag (the part indicated by the reference numeral (Bn)). And, by the deformation of the bag body in the bulging direction,
In the opening (20), a force acts on the polarized portion (S) as an axis to press the front and back films of a portion corresponding to the fluid supply path (3) in a direction in which they are in close contact with each other. As a result, in the bag of the present invention, the filled gas and a part of the article to be packaged do not leak through the opening (20), the fluid supply path (3) and the opening (10).

As described above, the bag of the present invention can be easily prepared by simply inserting the filling nozzle (5) into the opening (10) even after the mouth is sealed by the sealing portions (1, 2). Gas can be charged. In other words, the gas to be filled can be filled in a process separate from the sealing process, and when the bag of the present invention is applied to gas filling packaging (fluid filling packaging), the device configuration of the sealing mechanism of the packaging machine And the packaging machine can be further miniaturized.

Further, in the bag of the present invention, the two seal portions (1, 2) constituting the fluid supply passage (3) at the mouth portion have the patterns shown in FIGS. 1, 2 and 3 (a). Fig. 3
As shown in (b) to FIG. 4 (h), various patterns can be formed. For example, at the mouth portion of the bag shown in FIG. 3B, the seal portion (1) is formed to extend from the left edge to the vicinity of the right edge of the bag body, and the seal portion (2) is formed on the right side of the bag body. It is formed short from the edge to the left. The outer opening (10) is small and the inner opening (20) is large.

At the mouth of the bag shown in FIG. 3 (c), seal portions (1, 2) are formed from different side edges of the bag body to substantially the center, and an outer opening (10) is formed. The inner opening (20) is provided substantially at the center of the opening. Further, at the mouth portion of the bag shown in FIG. 3D, a seal portion (1) is formed to extend from the left edge to the vicinity of the right edge of the bag body, and the seal portion (2) is formed on the right side of the bag body. It is formed from the edge to the approximate center of the bag body. The outer opening (10) is small and the inner opening (20) is large. The mode shown in FIG. 3D is different from the mode shown in FIG. 3B in that the inner seal portion (2) is formed long and the fluid supply path (3) is formed long.

At the mouth of the bag shown in FIG. 4 (e), each of the seals (1, 2) is formed to extend from different side edges of the bag body to the vicinity of the other side edge. The outer opening (10) and the inner opening (20) are smallly opened at both side edges of the bag body. FIG.
The mode shown in (e) is different from the modes shown in FIGS. 3B and 3D in that the inner seal portion (2) is formed longer and the fluid supply path (3) is formed longer.

3 (b) to 4 (e), the bag has the same function as the bag shown in FIG. 3 (a) in the state where the bag body is filled with gas, for example. Since the film on the front and back of the fluid supply path (3) adheres more air-tightly according to the internal pressure of the bag body, the filled gas and a part of the article to be packaged are opened (20), the fluid supply path (3) and It does not leak through the opening (10).

On the other hand, the pattern of the seal portions (1, 2) shown in FIGS. 4 (f) to 4 (h) is obtained by dividing any one of the seal portions so as not to include a side edge of the bag body. This is a pattern in which the opening (10) or the opening (20) is formed. Specifically, at the mouth of the bag shown in FIG. 4 (f), the seal portion (1) is formed slightly longer rightward from the left edge of the bag body, and is provided on the right edge of the bag body. Are relatively large. The seal portion (2) is formed slightly longer to the left from the right edge of the bag body, and is also formed on the left edge of the bag body across the unwelded opening (20).

At the mouth of the bag shown in FIG. 4 (g), a seal portion (1) is formed slightly longer rightward from the left edge of the bag body and is separated from the unwelded opening (10). It is also formed on the right edge. And the seal part (2)
Is formed slightly longer leftward from the right edge of the bag body, and an inner opening (20) is relatively large on the left side of the bag body. In the bags shown in FIGS. 4F and 4G, the lengths of the fluid supply passages (3) are different,
In any case, the filled gas or a part of the packaged product leaks through the opening (20), the fluid supply path (3) and the opening (10) by the same function as the bag shown in FIG. Nothing.

Further, at the mouth portion of the bag shown in FIG. 4 (h), seal portions (1) are formed over both side edges of the bag body, and unsealed openings are formed at both side edges of the bag body. Department (1
0) is provided. And the seal part (2) is a seal part divided into two, and these are formed short from both side edges of the bag body toward the center. That is, the bag shown in FIG. 4 (h) is provided with outer openings (10) at both side edges of the bag body, and the inner openings (2).
0) is greatly opened at the center of the mouth, and fluid supply passages (3) are formed at positions corresponding to both ends of the outer seal portion (1).

In the embodiment shown in FIG. 4 (h), gas can be filled from either of the two openings (10), and
At the ends of the inner seal portions (2) opposed to each other, FIG.
In order to exhibit the same function as the bag shown in (a), for example, the filled gas or a part of the packaged product leaks through the opening (20), the fluid supply path (3) and the opening (10). There is no.

That is, in the bag of the present invention, in any of the embodiments shown in FIGS.
Even after the mouth is sealed by 2), the required gas, for example, can be filled separately and easily from the sealing step, and the specific arrangement relationship of the seals (1, 2) and the openings (10, 20). The function of making the films on the front and back of the fluid supply path (3) adhere to each other allows the filled gas and the article to be packed to be securely enclosed.

Further, in the bag of the present invention, the seal portion (1) and the seal portion (2) do not necessarily need to be formed parallel to each other, and need not be formed linearly. For example, the bag shown in FIG. 5 (i) is a bag in which the seal portion (1) and the seal portion (2) are not parallel, and the fluid supply passage (3) is formed at the mouth of such a bag. Each of the seal portions (1, 2) is formed to be long from different side edges of the bag body to the vicinity of the other side edge, and the outer opening (10) and the inner opening (20) are formed in the bag body. Are smallly opened at both side edges. Moreover, the seal portion (2) has a shape bent inward from a substantially central portion in the longitudinal direction. That is, FIG.
The bag shown in (1) has a structure in which the width on the inlet side of the fluid supply path (3) is formed to be large, so that, for example, gas can be filled more easily.

The bag shown in FIG. 5 (j) is a bag in which the seal portion (1) and the seal portion (2) are not linear, and each of the seal portions (1, 2) is provided at the mouth of the bag. ) Are formed long from different side edges of the bag body to the vicinity of the other side edge, and the outer opening (10) and the inner opening (20) are respectively small at both side edges of the bag body. It is open. Moreover, each of the seal portions (1, 2) has a zigzag bent shape. That is, FIG.
The bag shown in (j) has a structure in which the fluid supply path (3) is configured as a zigzag path and can further increase the airtightness of the filled gas, for example.

At the mouth of the bag shown in FIG. 5 (k), a seal portion (1) is formed slightly longer rightward from the left edge of the bag body and is separated from the unwelded opening (10). The seal portion (2) is formed to extend leftward from the right edge of the bag body, and a small inner opening (20) is formed on the left side of the bag body. Further, a guide seal portion (4, 4) for guiding the filling nozzle (5).
Are provided on both sides of the opening (10). FIG. 5 (k)
By providing the guide seal portions (4, 4), the filling nozzle (5) can be easily and safely inserted, for example, when gas is charged. The bag of each embodiment shown in FIG. 5 can be easily filled with a required gas even after the mouth is sealed, as in the bags shown in FIGS. Can be reliably enclosed.

The bag according to the first aspect has a fluid supply path (3) extending from the outside to the inside of the bag body, and the film on the front and back of the fluid supply path (3) is formed by the internal pressure of the bag body. Three or more seal portions may be formed in the mouth as long as the function of sealing by contact can be exhibited. Further, a fluid supply path (3) may be provided at the bottom of the bag body. In the filling and packaging in that case, the bottom portion is sealed in advance by forming two seal portions (1, 2) on the bottom portion, and then the article to be packaged is stored in the bag body from the mouth portion. Is welded according to a conventional method, and a fluid such as a gas is filled from the bottom.

Next, the bag according to the second embodiment, in which a fluid supply path is formed at a side edge as one edge of the bag body, will be described by taking as an example a case where the bag is applied to gas-filled packaging. The bag of the present invention illustrated in FIG. 6 is a bag in which a fluid supply path is formed at a side edge of the bag body. In such a bag,
The side edge (the right edge in the drawing) is provided from the mouth or bottom (mouth in the drawing) of the bag body to the side edge (the right edge in the drawing) so that, for example, gas can be easily filled after the packaged article is stored. A single band-shaped seal portion (2) extending along the right edge of the drawing) is provided, and the fluid supply passage (3) is formed by the seal portion (2) and the side edge of the bag body. Be composed. In addition, at least a part of the side edge along the extension direction of the seal portion (2) is provided with an unwelded inner opening (20) opened to the inside of the bag body. That is, the opening (20) is formed by the band-shaped seal portion (2).

Specifically, in the bag shown in FIG. 6, the length of the bag body extends from the left side edge (not shown) to the right side edge and does not reach the right side edge. A sealing portion (6) for sealing is formed along the mouth, the sealing portion (2) is formed from the right end of the sealing portion (6) of the mouth toward the bottom, and the sealing portion (2) is formed. The above-mentioned inner opening (20) is arranged at the tip side of ()). And, between the right end of the seal portion (6) and the right side edge (edge formed by folding or welding) of the bag body, that is, the base end of the seal portion (2) and the right side end of the bag body. The gap with the rim is an outer opening (10) opened to the outside of the bag body for inserting the filling nozzle (5).

In the above bag, when viewed from the inside of the bag body toward the side edge (right side edge), an outer opening (10) and an inner opening (20) are formed. Are disposed at positions shifted from each other, and between the sealing portion (2) and the side edge of the bag body which are in a positional relationship overlapping each other, the outer opening (10) is connected to the inner opening (20). )
The above-mentioned fluid supply path (3) leading to is formed.

The above-mentioned seal part (2) and seal part (6)
Are formed in the same manner as in the first embodiment. The width of the seal portion (2, 6) and the maximum and minimum lengths of the seal portion (2) are set in the same manner as in the first embodiment. That is, the overlap length (L1) of the seal portion (2) and the side edge described above, in other words, the length (L1) of the fluid supply path (3) is set to 3 mm or more, preferably 5 mm or more. The minimum width (L2) of the fluid supply path (3) between the part (2) and the side edge is set to 15 mm or less, preferably 10 mm or less, and 5 mm or more.

The bag of the present invention shown in FIG. 6 is sealed by forming two seal portions (2, 6) with a heat sealer after accommodating the article to be packaged in the bag body. Then, a filling nozzle (5) is inserted into the opening (10) between the front and back films, and the bag body is filled with a required gas, for example. In the gas filling, as in the first embodiment, since the film itself is not deformed at first, the fluid supply path (3) can be easily expanded by blowing gas from the filling nozzle (5). It can be easily filled through the fluid supply passage (3) and the opening (20).

In the bag of the present invention, when the bag body is filled with gas by the above operation, the inner opening located at one end of the fluid supply passage (3), as in the first embodiment. In (20), for example, a part of a side edge (reference numeral (B1)) facing from the one end part (part indicated by reference numeral (A)) of the seal part (2) due to the inflation deformation of the bag body due to the internal pressure. The linearly polarized portion (S) leading to the portion indicated by parentheses)
Is formed. Then, in the opening (20), a force acts on the polarized portion (S) as an axis to press the front and back films of a portion corresponding to the fluid supply path (3) in a direction in which they are in close contact with each other. As a result, in the bag of the present invention, the filled gas and a part of the article to be packaged do not leak through the opening (20), the fluid supply path (3) and the opening (10). In the bag according to the second embodiment, a fluid supply path (3) may be provided at the bottom of the bag body, as in the first embodiment.

In the bag of the present invention, as shown in the first and second embodiments, one edge of the bag body where the front and back films overlap is inwardly deformed by inflation of the bag body due to fluid filling. As long as the fluid supply path (3) in which the front and back films are in close contact with each other is formed in the opening (20), the shape of the mouth, bottom and side edges can be designed to any shape.

Further, the bag of the present invention may be a so-called gusset bag having an edge portion of a folding structure. Gusset bags are
It is a bag of a known form, such a bag, for example, by manufacturing a cylindrical film by an extrusion die, by applying a gusset process to fold the circumferential portion from left and right inward,
In the flat state before use, it has a structure in which the side edges are folded inwardly, and when the packaged goods are stored, the folded parts on both sides expand as the bag body deforms and the three-dimensional external shape of the polyhedron Is configured.

For example, the bag of the present invention shown in FIG.
A gusset bag formed by heat-sealing the upper and lower ends of a cylindrical film whose side edges are folded inward and are flattened, the mouth of which is formed in a trapezoidal shape in a side view. The fluid supply passage (3) according to the first aspect is formed in the portion. Reference numeral (8) indicates a valley fold at the side edge of the bag body. The bag of the present invention shown in FIG. 7 (m) is a gusset bag in which the fluid supply path (3) of the second embodiment is formed at the mouth, and the fluid supply path (3) is located outside. 7 (l) is different from the bag shown in FIG. 7 (l) in that it is formed along one side edge. The bag as shown in FIG. 7 can be easily filled with the required gas or liquid simply by inserting the filling nozzle (5) into the opening (10) even after the mouth is sealed, similarly to the bags of the above-described embodiments. Can be filled, and after filling, gas, liquid and packaged goods do not leak. Therefore, when the above-described bag is applied to fluid-filled packaging, the sealing mechanism of the packaging machine can be simplified, and the packaging machine can be further downsized.

In the bag of the present invention, in order to facilitate the operation of inserting the filling nozzle (5) in filling the fluid, one of the front and back films corresponding to the opening (10) protrudes at the end. It may be a bag in a form. For example, the bag shown in FIG. 6 is provided with an overhanging portion (7) in which a part of the back side film protrudes from the front side film above the opening (10) of the mouth. (7)
The filling nozzle (5) can be smoothly inserted between the front and back films. The overhang as described above may be provided over the entire width of the mouth. Furthermore, in the bag of the present invention, as long as the fluid supply path (3) is formed at one edge of the bag body, other portions of the bag body other than the edge have rigidity. Flexible containers are also included.

[0048]

According to the fluid-filled packaging bag of the present invention, even after the mouth is sealed, it is possible to easily and separately perform the required steps separately from the sealing step through the outer and inner openings and the fluid supply passage. It can be filled with gas or liquid. Then, due to the expansion deformation of the bag body due to the fluid filling, a force acts on the polarized portion formed at the opening of the fluid supply path as an axis to press the front and back films of the portion corresponding to the fluid supply path in a direction in which they are in close contact with each other. Therefore, the filled fluid and a part of the packaged product do not leak out, and these can be securely sealed. Therefore,
When the gas-filled packaging bag of the present invention is applied, the sealing mechanism of the packaging machine can be simplified, and the packaging machine can be further downsized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of the appearance of a fluid-filled packaging bag according to a first embodiment of the present invention.

FIG. 2 is a side view showing a function of a seal portion at a mouth portion of the fluid-filled packaging bag according to the first embodiment in a plan view.

FIG. 3 is a side view showing a planar arrangement pattern of a seal portion and an opening at a mouth of the fluid-filled packaging bag according to the first embodiment.

FIG. 4 is a side view showing another arrangement pattern of the seal portion and the opening at the mouth of the fluid-filled packaging bag according to the first embodiment in a plan view.

FIG. 5 is a side view showing, in a plane, still another arrangement pattern of the seal portion and the opening at the mouth of the fluid-filled packaging bag according to the first embodiment.

FIG. 6 is a side view showing an example of the fluid-filled packaging bag according to the second embodiment of the present invention.

FIG. 7 is a side view showing an example of the shape of the mouth portion according to the first and second aspects and an example of a gusset-shaped fluid-filled packaging bag.

[Explanation of symbols]

 1: Seal part 10: Opening part 2: Seal part 20: Opening part 3: Fluid supply path 5: Filling nozzle L1: Length of fluid supply path L2: Minimum width of fluid supply path S: Linear polarization part

 ──────────────────────────────────────────────────続 き Continued on front page F term (reference) 3E053 AA06 BA05 BA06 BA07 DA03 DA04 DA07 DA10 FA10 JA10 3E064 AA04 AA05 AA09 AA13 BA26 BA30 BA36 BA38 BA40 BA55 BA60 BB03 BC18 EA08 EA18 GA06 HN05 HR08 HR10 3E012AABB BC03A CA24 EA07 EA08 EE56 FA01 FC01 GA19 GD01

Claims (4)

[Claims] A fluid-filled packaging bag to be filled with a fluid, wherein one edge of the bag body where the front and back films overlap is provided with a fluid supply channel for fluid filling from the outside to the inside of the bag body. 3) is formed along the one edge, and the opening (20) inside the fluid supply path (3) is used to form the film on the front and back of the fluid supply path (3) by the expansion deformation of the bag body due to the fluid filling. A fluid-filled packaging bag, which has a function of causing close contact. 2. The bag according to claim 1, wherein a fluid supply path (3) is formed at the mouth or bottom of the bag body, wherein the fluid supply path (3) is located on the side of the bag body. The unwelded outer and inner openings (1) extending from the edge side to portions shifted from each other and opened to the outside and inside of the bag body, respectively.
0, 20), each of which has an outer opening (10) and an inner opening when the mouth or bottom is viewed from inside the bag body. A fluid-filled packaging bag formed by an outer seal portion (1) and an inner seal portion (2) in an overlapping positional relationship by disposing the portions (20) at positions shifted from each other. 3. The fluid-filled packaging bag according to claim 1, wherein a fluid supply path (3) is formed at a side edge of the bag body.
The fluid supply channel (3) extends along the side edge from the mouth or bottom of the bag body and forms a single band-shaped unopened inner opening (20) open to the interior of the bag body. (2) and the side edge of the bag body, and the outer opening (10) and the inner side opened to the outside of the bag body when the side edge is viewed from the inside of the bag body. The fluid filling packaging bag is formed by the seal portion (2) and the side edge of the bag main body which are in an overlapping positional relationship by disposing the opening portion (20) of the bag member at a position shifted from each other. 4. The length (L1) of the fluid supply passage (3) is 3 m.
m or more, and the minimum width (L
The fluid-filled packaging bag according to claim 2, wherein 2) is 15 mm or less.