JP3235321U - Packaging bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging bag body capable of reliably discharging gas generated from a content and preventing fine powder adhering to the content from leaking to the outside. SOLUTION: A bag main body 2 having a welded portion 3 in which laminated base materials 16 are heat-welded to each other and a vented portion 5 formed in at least a part of the welded portion 3 are provided, and the vented portions 5 are separated and parallel to each other. It is composed of a plurality of linear intermittent seal portions 6 arranged in the above, and in each intermittent seal portion 6, the sealed portion 7 and the unsealed portion 8 are alternately arranged along the longitudinal direction Y of the welded portion 3. Therefore, each of the sealing portions 7 of the plurality of intermittent sealing portions 6 has one or more sealing portions 7 in any of the venting portions 5 when the venting portion 5 is viewed from the lateral direction C of the welding portion 3. The laminated base material 16 is provided with a base material layer and a thermoplastic resin layer, and a non-woven fabric is provided between the laminated base materials 16 in which the thermoplastic resin layers are stacked so as to face each other at least in the ventilation portion 5. Be mediated. [Selection diagram] FIG. 10

Description

The present invention relates to a packaging bag for storing powders such as beans and rice grains.

Conventionally, as a bag for storing rice grains, as disclosed in Patent Document 1, a bag provided with a ventilation portion for venting air in the bag is known.

Jikkai Akira 58-65241 Gazette

However, in the packaging bag disclosed in Patent Document 1, the air vent holes are formed in the direction orthogonal to the longitudinal direction of the sealing portion, and the fine powder adhering to the powder or granular material easily leaks to the outside as it is, and the packaging bag. There was a risk that the surface would get dirty. In addition, there is a possibility that the air vent holes may be blocked due to the close contact between the sheets constituting the bag, and smooth exhaust may be hindered.

Therefore, it is an object of the present invention to provide a packaging bag body capable of reliably discharging the gas generated from the contents and suppressing the leakage of fine powder adhering to the contents to the outside.

In order to solve the above problems, the packaging bag body as one aspect of the present invention is made of a heat-weldable laminated base material, and has a bag main body having a welded portion in which the laminated base materials are heat-welded to each other, and the welding. The venting portion is provided with a venting portion formed in at least a part of the portion, and the venting portion is composed of a plurality of linear intermittent sealing portions arranged in parallel at a distance, and each of the intermittent sealing portions is formed with a sealing portion. The unsealed portions are alternately arranged along the longitudinal direction of the welded portion, and each of the sealed portions of the plurality of intermittent sealed portions is formed when the vented portion is viewed from the lateral direction of the welded portion. The laminated base material is provided with a base material layer and a thermoplastic resin layer so that one or more sealing portions are present in any portion of the ventilation portion, and the thermoplastic resin portion is provided at least in the ventilation portion. A non-woven fabric is interposed between the laminated base materials in which the resin layers are laminated so as to face each other, and a combined resin layer in which the thermoplastic resin layer of the laminated base material and the non-woven fabric are united is formed in the sealing portion. It can be configured.

The nonwoven fabric may be made of a thermoplastic resin. Further, a nonwoven fabric layer adjacent to the thermoplastic resin layer is provided, the nonwoven fabric is the two layers of the nonwoven fabric stacked so as to be in contact with each other at the welded portion and the sealed portion, and the combined resin layer is the welded resin layer. The layer may be a combination of the thermoplastic resin layer and the non-woven fabric layer of the laminated base material stacked in the portion and the sealing portion.

Wherein the thermal thickness of the thermoplastic resin layer is 10 m to 60 m, it may be configured basis weight of the nonwoven fabric is ^{9g / m 2 ~60g / m 2} . Further, the non-woven fabric or the internal space of the non-woven fabric layer in the unsealed portion may be configured as a ventilation passage.

In the ventilation portion, the intermittent seal portion may be formed in three or more rows, and an unsealed region having a substantially V shape may be formed by the adjacent unseal portion.

A plurality of the unsealed regions may be formed, and the plurality of unsealed regions may be connected to each other by a longitudinal unsealed portion formed between the adjacent intermittently sealed portions.

According to the above aspect, the unsealed portion constituting the ventilation path in the ventilation portion is not formed linearly in the lateral direction of the backing portion, but is bent so as to bypass the sealing portion on the way. Even if the contents of the bag contain fine powder, the progress is hindered in the middle of the detour, and it is possible to prevent the bag from leaking to the outside. In addition, since the internal space of the non-woven fabric arranged in the unsealed part is used as a ventilation path, the ventilation path can prevent blockage and surely discharge the gas in the bag, and more effectively leak the fine powder to the outside. Can be suppressed.

Front view showing the packaging bag body of the first embodiment of the present invention. Enlarged view of the part surrounded by the frame A in FIG. Partially enlarged bottom view of the part surrounded by the frame B in FIG. Schematic cross-sectional view showing a laminated base material constituting the packaging bag body of the first embodiment. Schematic cross-sectional view showing the state of the laminated base material and the non-woven fabric before forming the ventilation portion of FIG. Schematic cross-sectional view of the seal portion of FIG. Schematic cross-sectional view of the unsealed portion of FIG. Schematic cross-sectional view showing a state in which the laminated base material of the second embodiment is polymerized. Schematic cross-sectional view of the unsealed portion in the second embodiment Front view showing the packaging bag body of the second embodiment

[First Embodiment]
Hereinafter, the first embodiment of the present invention will be described with reference to the drawings. In the present embodiment, as the packaging bag body, a bag body for storing coffee beans will be described as an example. 1 is a front view showing a packaging bag body in the present embodiment, FIG. 2 is an enlarged view of a portion surrounded by the frame A of FIG. 1, and FIG. 3 is one of the portions surrounded by the frame B of FIG. An enlarged bottom view of a part is shown, and FIG. 4 shows a schematic cross-sectional view showing a laminated base material in the present embodiment. In FIG. 1, the arrow X indicates the left-right direction of the packaging bag, and the arrow Y indicates the vertical direction of the packaging bag body. The left-right direction X and the up-down direction Y are for clarifying the relative positional relationship of each part in the packaging bag body, and do not necessarily match the direction at the time of use and the front and back of the printed surface.

As shown in the figure, the packaging bag body of the present embodiment includes a bag body 2 made of a heat-weldable laminated base material 1. The bag main body 2 includes a welded portion (back-pasted portion) 3 in which the left and right ends of the laminated base material 1 are superposed and hot-welded so that the inner surfaces of the laminated base materials 1 are in contact with each other, and a bottom welded portion 4. The bag body 2 has an upper opening, and after storing coffee beans from this upper opening, the upper opening is closed. A ventilation portion 5 is formed in a part of the backing portion 3.

The ventilation portion 5 is composed of three linear intermittent seal portions 6a, 6b and 6c arranged in parallel at a distance (hereinafter, when the general description of the intermittent seal portion is described, the “intermittent seal portion 6” is used. It is described as.). In the intermittent sealing portion 6, the sealing portion 7 and the unsealed portion 8 are alternately arranged along the longitudinal direction (vertical direction Y) of the backing portion 3. A long unsealed portion 18 is formed between the intermittent sealed portions 6 and 6.

As shown in FIG. 3, in the back-pasted portion 3, the unsealed portion 8 is continuous from the unsealed portion 8 existing at the base end portion 3b of the back-pasted portion to the unsealed portion 8 existing at the tip portion 3a of the back-pasted portion. The gas inside the bag can be exhausted to the outside by using the air passage 9. Each of the sealing portions 7 of the intermittent sealing portions 6a, 6b, and 6c of Article 3 has a ventilation portion when the ventilation portion 5 is viewed from the lateral direction (direction of arrow C) of the backing portion 3, that is, from the left-right direction X. In any part of 5, one or more sealing portions 7 are arranged so as to be present.

In other words, the ventilation passage 9 composed of the unsealed portion 8 is not formed linearly in the lateral direction of the back-pasted portion 3, but is formed so as to bypass the sealed portion 7 on the way. Therefore, even if the contents of the bag contain fine powder, the detour circuit formed in the air passage 9 hinders the progress and can prevent the bag from leaking to the outside. In addition, the amount of air flowing in from the outside through the ventilation passage 9 can be limited, and deterioration of the contents can be suppressed.

The laminated base material 1 constituting the bag main body 2 includes a base material layer and a thermoplastic resin layer. The base material may be one type or a plurality of types. Specifically, as the base material, a paper base material such as unbleached kraft paper, a polyolefin film such as OPP film, a polyester film such as PET (polyester terephthalate), a polyamide (nylon) film and the like can be used. .. In this embodiment, two types of aesthetically pleasing unbleached kraft paper and PET film having excellent gas impermeable properties are used as the base material. As shown in FIG. 4, in the laminated base material 1, a second base material layer 11b made of a PET film is laminated on the inner surface of a first base material layer 11a made of unbleached kraft paper via a first thermoplastic resin layer 12a. The second thermoplastic resin layer 12b is laminated on the inner surface of the second base material layer 11b.

The first thermoplastic resin layer 12a and the second thermoplastic resin layer 12b may use different resins or may be the same resin. At least, the second thermoplastic resin layer 12b, which is the innermost layer, can be heat-welded. Specifically, as the thermoplastic resin composition constituting the thermoplastic resin layers 12a and 12b, a polyolefin such as polypropylene or polyethylene can be used as the main component resin. As the polyethylene, low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene and the like can be used, and in particular, low-density polyethylene and linear low-density polyethylene are used from the viewpoint of adhesiveness. Is preferable.

The thermoplastic resin layers 12a and 12b may be laminated on the first base material 11a and the second base material layer 11b by a dry laminating method or may be laminated by an extrusion laminating method. In this embodiment, low-density polyethylene is used as the thermoplastic resin layers 12a and 12b, and is laminated on the first base material 11a and the second base material layer 11b by the extrusion laminating method.

In the backing portion 3, the laminated base materials 1 and 1 are overlapped and heat-welded so that the inner surfaces are in contact with each other. At this time, at least in the ventilation portion 5, as shown in FIG. 5, the sealing portion 7 is provided with a heated mold with the nonwoven fabric 13 interposed between the laminated base material 1 and the laminated base material 1. The part is heat welded.

The nonwoven fabric 13 may be made of plant fibers such as pulp or may be made of thermoplastic resin fibers. In the case of a non-woven fabric made of a thermoplastic resin, it is preferable that the laminated base materials 1 and 1 are melted by heating and pressurizing under the condition of heat welding, or the volume is reduced and the internal space between fibers is significantly reduced. ..

Specific examples of the non-woven fabric 13 made of a thermoplastic resin include polyolefins such as polyethylene. As the polyethylene, low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene and the like can be used, but in particular, low-density polyethylene and linear low-density polyethylene are used because they are easily melted. It is preferable to use it. As the nonwoven fabric 13, the same type of resin as the second thermoplastic resin layer 12b can be used. In this embodiment, low density polyethylene is used as the nonwoven fabric 13.

As described above, in the seal portion 7, as shown in FIG. 6, a coalesced resin layer 14 is formed in which the opposing thermoplastic resin layers 12b and 12b and the nonwoven fabric 13 interposed therein are united. The non-woven fabric 13 may be filled with the resin of the molten thermoplastic resin layer 12b in the combined resin layer 14, or when the non-woven fabric 13 is made of a thermoplastic resin, the inside space of the non-woven fabric 13 may be filled with the resin. The non-woven fabric 13 may be melted and integrated with the resin of the thermoplastic resin layer 12b, or the internal space of the non-woven fabric 13 may be reduced and the remaining internal space may be melted even if the non-woven fabric 13 is not melted. It may be filled with the resin of the layer 12b. In any case, in the combined resin layer 14 formed in the seal portion 7, no internal space remains in the nonwoven fabric 13, and the non-woven fabric 13 has gas impermeable property.

On the other hand, in the unsealed portion 8, as shown in FIG. 7, the nonwoven fabric 13 interposed between the thermoplastic resin layers 12b and 12b remains as it is. Therefore, the internal space of the nonwoven fabric 13 functions as a ventilation passage 9. As described above, since the internal space of the non-woven fabric 13 arranged in the unsealed portion 8 is the ventilation passage 9, it is possible to prevent the ventilation passage 9 from being blocked and to reliably discharge the gas in the bag to the outside of the fine powder. Leakage can be suppressed more effectively.

The thermoplastic resin layer 12b preferably has a thickness of 10 μm to 60 μm. Further, the nonwoven fabric 13 is preferably a basis weight of ^{9g / m 2 ~60g / m 2} . By setting the above range, it is possible to surely form the combined resin layer 14 in which the thermoplastic resin layer 12b and the nonwoven fabric 13 are united in the sealed portion 7, and while preventing the ventilation passage 9 from being blocked in the unsealed portion 8. , Breathability can be ensured.

[Second Embodiment]
8 to 10 are views showing a second embodiment of the present invention, FIG. 8 is a schematic cross-sectional view showing a state in which laminated base materials of the present embodiment are laminated, and FIG. 9 is a schematic cross-sectional view of the present embodiment. It is a schematic cross-sectional view of an unsealed portion, and FIG. 10 is a front view showing a packaging bag body in this embodiment. The present embodiment is characterized in that the configuration is different from that of the laminated base material of the first embodiment, and the arrangement of the sealed portion and the unsealed portion constituting the ventilation portion is different, and the other configurations are the first embodiment. Similar to morphology.

As shown in the figure, in this embodiment, instead of the nonwoven fabric 13 used in the first embodiment, the nonwoven fabric layer 15 adjacent to the second thermoplastic resin layer 12b of the laminated substrate 1 is provided. Specifically, as shown in FIG. 8, the laminated base material 16 includes a first base material layer 11a made of unbleached kraft paper, a first thermoplastic resin layer 12a, and a second base material layer 11b made of PET film. 2 The thermoplastic resin layer 12b and the non-woven fabric layer 15 are laminated in this order.

The nonwoven fabric constituting the nonwoven fabric layer 15 is the same as the nonwoven fabric of the first embodiment. In the ventilation portion 3, two layers of the nonwoven fabric layer 15 are combined by stacking the laminated base materials 16 and 16, so that the nonwoven fabric used for the one-layer nonwoven fabric layer 15 has a basis weight of 5 g / m ^2. It is preferably ~ 30 g / m ^2.

As shown in FIG. 8, in the backing portion 3, the laminated base materials 16 and 16 are laminated and heat-welded so that the nonwoven fabric layers 15 and 15 face each other. In the sealing portion 7, the nonwoven fabric layers 15 and 15 and the second thermoplastic resin layers 12b and 12b are united to form the combined resin layer 14 as in the first embodiment (see FIG. 6). In the unsealed portion 8, as shown in FIG. 9, the non-woven fabric layers 15 and 15 remain as they are, and the internal space of the non-woven fabric layers 15 and 15 functions as a ventilation passage 9.

As shown in FIG. 10, the ventilation portion 9 of the present embodiment increases the length of the unsealed portion 8 of the intermittent seal portions 6b and 6c, so that the unsealed region 17 is combined by the adjacent unsealed portions 8. Is formed. In order to form the unsealed region 17 in various patterns, it is preferable that the number of intermittent seal portions 6 is 3 or more. In the present embodiment, the intermittent seal portion 6 has three rows, and the unsealed region 17 is substantially V-shaped when the ventilation portion 9 is viewed from the lateral direction (direction of arrow C) of the welded portion (back pasting portion 3). It is formed in a shape.

According to the above configuration, by forming the unsealed region 17, even when the content contains a large amount of fine powder, it is possible to prevent the ventilation path 9 from being clogged and maintain good air permeability. can. Further, by forming the unsealed region 17, the air permeability can be enhanced, and by changing the shape of the unsealed region 17, the air permeability can be adjusted. By making the shape of the unsealed region 17 V-shaped, it is possible to secure air permeability while suppressing leakage of fine powder to the outside.

When a plurality of unsealed regions 17 are formed in the ventilation portion 5, the plurality of unsealed regions 17 are connected to each other by the longitudinal unsealed portions 18 formed between the adjacent intermittent seal portions 6. Therefore, even if one unsealed region 17 is clogged in the middle, it is possible to suppress a decrease in air permeability due to clogging.

Although the embodiments of the present invention have been described above, the scope of the present invention is not limited to this, and various modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, the embodiment in which the welded portion is formed on the backing portion has been described, but the present invention is not limited to this, and for example, even in the case of a bag body in which the front film and the back film are overlapped and the peripheral portion is sealed. good. In this case, the welded portion may be formed on at least one of the peripheral sealing portions. Further, the packaging bag may have gusset portions formed on the bottom or both sides.

1 Laminated base material 2 Bag body 3 Backing part (welded part)
4 Bottom welding part 5 Ventilation part 6 Intermittent sealing part 7 Sealed part 8 Unsealed part 9 Ventilation passage 11a First base material layer 11b Second base material layer 12a First thermoplastic resin layer 12b Second thermoplastic resin layer 13 Non-woven fabric 14 Combined resin layer 15 Non-woven layer 16 Laminated base material 17 Unsealed area 18 Longitudinal unsealed part

Claims (7)

It is a packaging bag body made of a heat-weldable laminated base material and having a bag main body having a welded portion in which the laminated base materials are heat-welded to each other and a ventilation portion formed in at least a part of the welded portion. The venting portion is composed of a plurality of linear intermittent sealing portions arranged in parallel at intervals, and each of the intermittent sealing portions has a sealed portion and an unsealed portion in the longitudinal direction of the welded portion. Each of the seal portions of the plurality of intermittent seal portions is arranged alternately along the line, and one or more of the seal portions of the plurality of intermittent seal portions are arranged in any portion of the vent portion when the vent portion is viewed from the lateral direction of the welded portion. The laminated base material is arranged so that a sealing portion is present, and the laminated base material comprises a base material layer and a thermoplastic resin layer, and the laminated base is laminated so that the thermoplastic resin layers face each other at least in the ventilation portion. A packaging bag in which a non-woven fabric is interposed between the materials, and a combined resin layer in which the thermoplastic resin layer of the laminated base material and the non-woven fabric are united is formed in the sealing portion. The packaging bag according to claim 1, wherein the nonwoven fabric is made of a thermoplastic resin. A non-woven fabric layer adjacent to the thermoplastic resin layer is provided, and the non-woven fabric is two layers of the non-woven fabric layer which are laminated so as to be in contact with each other at the welded portion and the sealed portion, and the combined resin layer is the welded portion and the welded portion. The packaging bag body according to claim 1 or 2, which is a layer in which the thermoplastic resin layer and the non-woven fabric layer of the laminated base material stacked in the sealing portion are combined. Wherein the thermal thickness of the thermoplastic resin layer is 10 m to 60 m, basis weight of the nonwoven ^fabric, packaging bag according to claim 1 which is ^{9g / m 2 ~60g / m 2} . The packaging bag according to any one of claims 1 to 4, wherein the internal space of the nonwoven fabric in the unsealed portion is used as a ventilation path. 3. The packaging bag body according to any one of 5. The packaging bag according to claim 6, wherein a plurality of unsealed regions are formed, and the plurality of unsealed regions are connected to each other by a longitudinal unsealed portion formed between adjacent intermittently sealed portions.

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