JP2021031068A - Packaging bag - Google Patents

Abstract

To provide a packaging bag that can be easily manufactured with a spout in a stable opening state.SOLUTION: A packaging bag 1 is formed by facing a front portion 10 having a neck portion 15 formed by a laminated body and a rear portion formed by the laminated body and heat-sealing circumferences. The neck portion includes a base portion in a height direction middle portion of the packaging bag and extends upward. A distal end of the neck portion is positioned below with respect to an upper end of the packaging bag. The laminated body constituting a front surface of the neck portion includes a main emboss 121 having a convex-shaped extending in a height direction at a center portion of a width direction of the neck portion, and sub emboss 122 and 123 having a concave-shaped provided on both sides of a width direction of the main emboss. An angle that the sub emboss makes on the main emboss side and the lower side with respect to a line extending in the width direction of the package bag is between 55 and 80 degrees.SELECTED DRAWING: Figure 1

Description

The present invention relates to a packaging bag, more particularly a refillable packaging bag that can be suitably used for storing various liquids to be refilled in other containers.

Conventionally, it has been widely practiced to store various liquids such as seasonings, detergents, and cosmetics in a refill container such as a bottle, which is different from the main container, and sell the liquid. As a refill container, a pouch (packaging bag) formed of a laminated film is widely used. Such a pouch has advantages that the amount of plastic material used can be reduced as compared with the main container, and that the liquid inside can be folded into a small size after being transferred to the main container to reduce the volume as dust.

As one form of the pouch formed of the laminated film, the one described in Patent Document 1 is known. The pouch (bag-shaped container) described in Patent Document 1 has a body portion filled with contents and a nozzle portion branched from either the front or back surface of the body portion and the tip portion serves as an injection port for the contents. I have. The pouch described in Patent Document 1 can reduce the possibility of spilling the contents at the time of refilling by inserting the nozzle portion into the mouth portion of the present container and then tilting the bag-shaped container.

Japanese Unexamined Patent Publication No. 2005-888894

In the pouch described in Patent Document 1, the nozzle portion is normally bent downward. Therefore, at the time of refilling, the state in which the spout is opened due to this polygonal line is not stable, and the opening may be closed in the middle, making it difficult for the contents to come out.
On the other hand, if the nozzle portion is directed upward in the normal state, filling of the contents becomes complicated at the time of manufacturing the pouch.

Based on the above circumstances, it is an object of the present invention to provide a packaging bag that can be easily manufactured and has a stable opening state of the spout.

The present invention is a packaging bag formed by heat-sealing the peripheral edges of a laminated body with a front portion having a neck and a rear portion formed of the laminated body facing each other.
The neck portion has a base in the middle portion in the height direction of the packaging bag and extends upward, and the tip of the neck portion is located below the upper end of the packaging bag. The laminate constituting the front surface of the neck portion has a convex main embossing extending in the height direction at the central portion in the width direction of the neck portion and concave sub-embossing provided on both sides in the width direction of the main embossing. The angle formed by the sub-embossing on the main embossing side and the lower side with respect to the line extending in the width direction of the packaging bag is 55 degrees or more and 80 degrees or less.

The packaging bag of the present invention can be easily manufactured, and the opening state of the spout is stable.

It is a front view of the packaging bag which concerns on one Embodiment of this invention. FIG. 5 is a cross-sectional view taken along the line II of FIG. FIG. 5 is a cross-sectional view taken along the line II-II of FIG.

An embodiment of the present invention will be described with reference to FIGS. 1 to 3.
FIG. 1 is a perspective view showing a packaging bag 1 of the present embodiment filled with contents. The packaging bag 1 can be suitably used as a container for refilling various liquids such as seasonings, detergents, and cosmetics.

FIG. 2 is a cross-sectional view taken along the line II of FIG. FIG. 3 is a cross-sectional view taken along the line II-II of FIG. As shown in FIGS. 1 to 3, the packaging bag 1 includes a front portion 10, a rear portion 40, and a bottom portion 60. The front portion 10, the rear portion 40, and the bottom portion 60 are all formed of a laminated film.
The packaging bag 1 has a substantially rectangular shape that is long in the vertical direction (height direction) when viewed from the front, and the dimensions in the horizontal direction (width direction) are slightly smaller in the middle portion in the height direction.
The dimensions of the packaging bag 1 in the width direction can be set as appropriate. As an example, when the dimension in the width direction is set to about 60 mm to 120 mm, a user having an average hand size can easily grasp it with one hand, which is preferable.

As shown in FIG. 2, the bottom portion 60 is arranged between the front portion 10 and the rear portion 40 at the lower portion of the packaging bag 1 in a state of being bent so as to be convex toward the upper portion of the packaging bag 1. It is heat-sealed with the front portion 10 and the rear portion 40. The peripheral edges of the front portion 10 and the rear portion 40 are heat-sealed to each other except for the portion heat-sealed with the bottom portion 60. That is, the packaging bag 1 has a known standing pouch structure, and is configured to be self-supporting in a state in which the content C is filled and sealed.

In order to realize the above structure, the laminated film forming the front portion 10, the rear portion 40, and the bottom portion 60 has a heat-sealingable resin layer (sealant layer) on at least one surface in the thickness direction. Of the thermoplastic resins, polyolefin resins are generally used as the material of the sealant layer. Specifically, low density polyethylene resin (LDPE), medium density polyethylene resin (MDPE), and linear low density polyethylene resin. Ethylene-based resins such as (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-α-olefin copolymer, and ethylene-methacrylic acid resin copolymer can be used. Further, use a blend resin of polyethylene and polybutene, a polypropylene resin such as a homopolypropylene resin (PP), a propylene-ethylene random copolymer, a propylene-ethylene block copolymer, or a propylene-α-olefin copolymer. You can also.
The number and composition of the layers other than the sealant layer may be appropriately determined in consideration of the functions and characteristics required for the packaging bag 1. For example, a gas barrier layer that prevents the permeation of a predetermined gas, a light-shielding layer that protects the contents from light, a printing layer that gives a predetermined appearance to the packaging bag, and an overcoat layer that prevents the surface of the packaging bag from being scratched. Etc. can be exemplified.
A plastic film may be used as a layer other than the sealant layer. As the material of the plastic film, for example, polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.), polyimide, etc. can be used, depending on the application. Can be selected as appropriate. In particular, when polypropylene or polyethylene terephthalate is used as a plastic film, it is more preferable in terms of film strength and price. In addition, when a stretched polyamide film is used, it is possible to impart toughness against piercing and impact resistance to the laminated body.
A laminated film may be formed by joining a film-shaped sealant layer and the above-mentioned plastic film using an adhesive layer.

The front portion 10 has a first member 11 arranged at the upper part of the packaging bag 1 and a second member 12 arranged at the lower part of the packaging bag 1. The lower portion 11a of the first member 11 is bent along a bending line L extending in the left-right direction of the packaging bag 1 and extends upward. The second member 12 extends upward in a flat state having no fold line extending in the width direction of the packaging bag 1. The lower portion 11a and the upper portion 12a of the second member 12 are heat-sealed on both sides in the width direction and on the upper side so that the non-fused region gradually becomes thinner as the non-fused region is separated from the bent portion.

With the above configuration, the front portion 10 has a neck portion 15 for pouring the contents into the middle portion in the height direction. Immediately after the packaging bag 1 is manufactured, the neck portion 15 faces upward due to the rigidity of the unbent second member 12, and the tip of the neck portion 15 is located below the upper end of the packaging bag 1. A part of the heat-sealed edge portion of the neck portion 15 has been removed on the tip side, and the neck portion 15 is formed to be thin so that it can be inserted into the container.
The position of the base of the neck 15 coincides with the bending line L of the lower 11a. The base of the neck portion 15 is located at the center of the packaging bag 1 in the height direction or above the center in the height direction. The widthwise dimension of the packaging bag 1 is the smallest at the base of the neck 15, and gradually increases toward the upper and lower ends.

The neck portion 15 has an opening wire 15a that is easily opened near the tip. A spout can be formed at the tip of the neck 15 by cutting and removing the tip along the opening line 15a. As a method for forming the opening wire 15a, various known processing such as cold cutter and laser processing can be used.

The non-fused region R1 of the neck portion 15 extends substantially parallel to the height direction of the packaging bag 1, and the tip portion of the non-fused region R1 is located at the central portion in the width direction of the packaging bag 1. That is, the center of the non-fused region R1 in the width direction substantially coincides with the center of the packaging bag 1 in the width direction.

The second member 12 constituting the front surface of the neck portion 15 has a total of three embosses, a main emboss 121 provided in the central portion in the width direction and two sub-embosses 122 and 123 provided on both sides in the width direction of the main emboss. Has.
As shown in FIG. 3, the main emboss 121 is a convex emboss having a shape that is convex toward the outside of the packaging bag 1. The main embossed 121 extends linearly from the lower side of the base portion of the neck portion 15 along the center in the width direction of the non-fused region R1, and the upper end 121a is located above the opening line 15a.

As shown in FIG. 3, the sub-embosses 122 and 123 are concave embosses having a shape that is convex toward the inside of the packaging bag 1, and are groove-shaped in appearance of the packaging bag 1. The sub-embosses 122 and 123 are both linear and non-parallel to the main embossed 121. The positions of the lower ends of the sub-embossing 122 and 123 are substantially the same as those of the main embossing 121 in the height direction of the packaging bag 1. The distance between the main emboss 121 and the sub emboss 122 is the same as the distance between the main emboss 121 and the sub emboss 123, and the distance between the main emboss 121 and the sub emboss 121 increases as the distance approaches the upper end. The sub-embosses 122 and 123 extend above the base of the neck 15, but the upper ends do not reach the heat-sealed edges and are located below the upper ends of the main emboss 121.

In the packaging bag 1, the heat-sealing portions 20 that seal both ends in the width direction are formed with a substantially constant width over the height direction. As a result, the packaging bag 1 has an internal space having substantially the same shape as the outer shape and one size smaller than the outer shape.

The packaging bag 1 has a state in which a front portion 10 in which a first member 11 and a second member 12 are heat-sealed to form a neck portion 15 and a sheet-shaped rear portion 40 are opposed to each other with a bent bottom portion 60 interposed therebetween. It can be manufactured by heat-sealing the peripheral portion with. At this time, the peripheral edge of the upper end of the packaging bag 1 is left open without heat fusion, and is used as a filling port for the contents. Since the tip of the neck portion 15 is located below the upper end of the packaging bag 1, the filling operation of the contents is not hindered even if the neck portion 15 faces upward, and the filling operation can be easily performed.
When the desired contents are filled in the packaging bag 1 from the upper end portion and then the upper end portion is heat-sealed and sealed, the packaging bag 1 filled and sealed with the contents is completed.

When transferring the contents of the packaging bag 1 to another container such as this container, the user bends the upper side of the first member 11 to the rear side. Then, the tip end side of the neck portion 15 protrudes to the upper part of the packaging bag, and it becomes easy to insert it into another container. The upper side of the first member 11 is bent at the base portion of the neck portion 15, and the base portion of the neck portion 15 is located above the center in the height direction or the center in the height direction of the packaging bag 1. Therefore, the upper side of the first member 11 bent to the rear side does not extend below the lower end of the packaging bag 1, and a state in which the packaging bag 1 can be easily gripped is maintained.

The user inserts the tip end side of the neck portion 15 into the opening of another container while turning the tip end side of the neck portion 15 downward. The shape of the tip end side of the neck portion 15 is suitably held by the stiffness (rigidity) of the second member 12 having no bending line, and can be easily inserted into another container.

When the packaging bag 1 is inserted into another container, the filled contents move into the non-fused region R1 of the neck portion 15 by gravity. The contents push the second member 12 from the inside of the packaging bag 1, and as a result, the second member 12 bends along the main embossing 121 and the sub-embossed 122, 123.
At this time, the main embossing 121 is bent so as to be convex when viewed from the outside of the packaging bag 1, and the sub-embosses 122 and 123 are bent so as to be concave when viewed from the outside of the packaging bag 1. As a result, a prismatic three-dimensional space serving as a flow path for the contents is formed on the front side of the non-fused region R1 of the neck portion. This three-dimensional space is suitably held while the contents are refilled into another container by the main embossing 121 and the sub-embossing 122, 123 functioning like bones. Therefore, in the packaging bag 1, blockage or narrowing of the flow path during refilling is preferably prevented, and the refilling work can be smoothly performed.

The inventors have found that the above-mentioned effects vary depending on the mode of embossing formed on the neck. The results of the study on this point are shown below.

A plurality of packaging bags were prepared in which the materials, layer configurations and dimensions of the front portion 10, the rear portion 40 and the bottom portion 60 were the same, and only the embossing mode formed on the neck portion was different. The dimensions of each part of the packaging bag were 183 mm in height, 100 mm in maximum width, 30 mm from the lower end of the bottom height when unfilled, 118 mm from the lower end of the neck forming position, and 50 mm in neck length (before opening).

In embossing, the mode of main embossing was fixed, and only the mode of sub-embossing was changed in various ways.
The main emboss was a linear convex emboss with a length of 62 mm.
The sub-embossing was a linear embossing having a length of 31.4 mm, and the following parameters were changed to prepare a plurality of sample packaging bags.
・ Sub-embossed shape (convex embossed or concave embossed)
-Distance between the upper end of the sub-emboss and the heat fusion site on the periphery of the neck (5 types of 0 mm, 3 mm, 5 mm, 7 mm, and 8 mm)
-Angles formed by the sub-emboss on the main emboss side and the lower side with respect to the line extending in the width direction of the packaging bag (6 types of 53 °, 58 °, 63 °, 73 °, 78 °, and 83 °)

Each sample packaging bag was filled with 200 ml of water as a content, and the upper end was heat-sealed and sealed.
After that, the tip of the neck is removed to form a spout, and the lower side of the neck is lightly grasped and lifted so that the contents do not move into the non-fused region R1. The maximum distance to the second member was measured. The evaluation was made in the following three stages, and Δ and ○ were passed.
(×: bad): 0 mm (closed)
(Δ: fair): More than 0 mm and less than 1 mm (◯: good): 1 mm or more The embossing mode and evaluation result of each sample are shown in Table 1.

From the results of Samples 1 to 6, it was considered that the angle of the sub-embossing was preferably about 55 ° to 80 °.
From the results of Samples 4 and 7 to 10, it was shown that the distance between the upper end of the sub-embossing and the heat-sealing site on the periphery of the neck is preferably 7 mm or less, and the upper end and the heat-sealing site may be in contact with each other. ..
The results of Sample 11 indicate that the sub-embossing needs to be concave embossing.

Although one embodiment of the present invention has been described above, the technical scope of the present invention is not limited to the contents of the above-described embodiments and the like, and various changes are made to each component within the range not deviating from the gist of the present invention. It can be added or deleted.

For example, the packaging bag of the present invention is not limited to a standing pouch, and therefore does not have to have a bottom.
Further, in the above-described embodiment, an example in which the front portion is formed by joining the first member and the second member has been described, but as another configuration, the front portion is formed by bending one laminated film. It may be formed.

The waist strength of the second member is preferably 20 mN / 15 mm or more. In this case, the upward state of the neck is preferably held by the second member, and the neck is prevented from being unintentionally bent downward.
The waist strength of the film-shaped member can be measured using, for example, a loop stiff nestester (manufactured by Toyo Seiki Seisakusho Co., Ltd.). The measurement conditions may be, for example, a loop length of 80 to 110 mm, a sample width of 12 to 15 mm, a sample direction as the processing flow direction (MD direction), and a pushing amount (crushing distance) of 12 to 15 mm.

The main embossing and the sub-embossing do not have to be perfectly straight, for example, may be slightly curved.

The contents contained in the packaging bag of the present invention are not limited to liquids. The form of the content may be in the form of a gel, powder, or solid such as granules, and is not particularly limited.

1 Packaging bag 10 Front 15 Neck 40 Rear 121 Main emboss 122, 123 Sub emboss

Claims (4)

A packaging bag formed by heat-sealing the peripheral edges of a laminated body with a front portion having a neck and a rear portion formed of the laminated body facing each other.
The neck portion has a base portion in the middle portion in the height direction of the packaging bag and extends upward.
The tip of the neck is located below the top of the packaging bag.
The laminated body constituting the front surface of the neck portion
A convex main emboss extending in the height direction at the center of the neck in the width direction,
It has concave sub-embosses provided on both sides of the main emboss in the width direction.
The angle formed by the sub-embossing on the main embossing side and the lower side with respect to the line extending in the width direction of the packaging bag is 55 degrees or more and 80 degrees or less.
Packaging bag. The distance between the upper end of the sub-embossing and the heat-sealed peripheral edge is 7 mm or less.
The packaging bag according to claim 1. The waist strength of the laminate constituting the front surface of the neck portion is 20 mN / 15 mm or more.
The packaging bag according to claim 1. The packaging bag according to claim 1, wherein the base of the neck is located at the center of the packaging bag in the height direction or above the center in the height direction.

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