JP7383223B2 - packaging bag - Google Patents

Description

The present invention relates to a packaging bag, and more particularly to a refill packaging bag that can be suitably used to store various liquids to be refilled into other containers.

BACKGROUND ART Conventionally, various liquids such as seasonings, detergents, and cosmetics have been widely sold in refillable containers, such as bottles, that are different from the main container. Pouches (packaging bags) formed from laminated films are widely used as refill containers. Such a pouch has advantages such as being able to use less plastic material than the main container, and being able to fold the pouch into a smaller size after transferring the internal liquid to the main container, thereby reducing the volume of waste.

As one form of a pouch formed of a laminated film, one described in Patent Document 1 is known. The pouch (bag-like container) described in Patent Document 1 has a body portion filled with contents and a nozzle portion that branches from either the front or back of the body portion and whose tip serves as a spout for pouring out the contents. We are prepared. The pouch described in Patent Document 1 can reduce the possibility of spilling the contents during refilling by inserting the nozzle into the mouth of the main container and then tilting the bag-like container.

Japanese Patent Application Publication No. 2005-88894

In the pouch described in Patent Document 1, the nozzle portion is bent downward during normal times. Therefore, when refilling, the opening state of the spout may not be stable due to this folded line, and the opening may close midway through, making it difficult for the contents to come out.
On the other hand, if the nozzle section is oriented upward in normal conditions, filling the pouch with the contents becomes complicated.

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

The present invention is a packaging bag formed by making a front part made of a laminate and having a neck part and a rear part made of a laminate face each other, and heat-sealing the peripheral part including the periphery of the neck part. .
The neck has a base in the middle part in the height direction of the packaging bag and extends upward, and the tip of the neck is located below the upper end of the packaging bag. The laminate forming the front surface of the neck has a convex main emboss extending in the height direction at the widthwise center of the neck, and concave sub-embosses provided on both sides of the main emboss in the width direction. The angle that the secondary embossing makes on the main embossing side and lower side with respect to a line extending in the width direction of the packaging bag is 55 degrees or more and 80 degrees or less.
The main embossing and the sub-emboss extend across the base from the upper side to the lower side of the base.

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

FIG. 1 is a front view of a packaging bag according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line II in FIG. 1. FIG. 2 is a sectional view taken along line II-II in FIG. 1. FIG.

One 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 this embodiment filled with contents. The packaging bag 1 can be suitably used as a refill container for various liquids such as seasonings, detergents, and cosmetics.

FIG. 2 is a sectional view taken along line II in FIG. 1. FIG. 3 is a sectional view taken along line II-II in FIG. 1. 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 part 10, the rear part 40, and the bottom part 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 its dimensions in the left and right direction (width direction) are slightly smaller at the middle part in the height direction.
The dimension of the packaging bag 1 in the width direction can be set as appropriate. As an example, it is preferable to set the width direction dimension to about 60 mm to 120 mm because a user with an average hand size can easily grasp it with one hand.

As shown in FIG. 2, the bottom part 60 is bent toward the top of the packaging bag 1 and is disposed at the bottom of the packaging bag 1 between the front part 10 and the rear part 40, The front part 10 and the rear part 40 are heat-sealed. The peripheral edges of the front part 10 and the rear part 40 are heat-sealed to each other except for a portion that is heat-sealed to the bottom part 60. That is, the packaging bag 1 has a well-known standing pouch structure and is configured to be able to stand on its own when the contents C are filled and sealed.

In order to realize the above structure, the laminated film forming the front part 10, the rear part 40, and the bottom part 60 has a heat-sealable resin layer (sealant layer) on at least one surface in the thickness direction. Among thermoplastic resins, polyolefin resins are generally used as the material for the sealant layer, and specifically, low-density polyethylene resin (LDPE), medium-density polyethylene resin (MDPE), and linear low-density polyethylene resin are used. Ethylene resins such as (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-α-olefin copolymer, and ethylene-methacrylic acid resin copolymer can be used. Furthermore, polypropylene resins such as blend resins of polyethylene and polybutene, homopolypropylene resins (PP), propylene-ethylene random copolymers, propylene-ethylene block copolymers, propylene-α-olefin copolymers, etc. may be used. You can also do it.
Regarding the layers other than the sealant layer, the number and configuration thereof may be determined as appropriate in consideration of the functions and characteristics required of the packaging bag 1. For example, a gas barrier layer that prevents the passage of certain gases, a light shielding layer that protects the contents from light, a printing layer that gives the packaging bag a certain appearance, and an overcoat layer that prevents scratches on the surface of the packaging bag. For example,
A plastic film may be used as a layer other than the sealant layer. Examples of materials that can be used for the plastic film include polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, etc.), polyamide (nylon-6, nylon-66, etc.), polyimide, etc., 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 cost. In addition, when a stretched polyamide film is used, the laminate can be given toughness against puncture and impact.
A laminated film may be formed by joining a film-like sealant layer and the above-mentioned plastic film using an adhesive layer.

The front portion 10 includes a first member 11 disposed at the top of the packaging bag 1 and a second member 12 disposed at the bottom 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 without a fold line extending in the width direction of the packaging bag 1. The lower part 11a and the upper part 12a of the second member 12 are heat-sealed at both sides in the width direction and at the upper edge so that the non-fused area gradually becomes thinner as it moves away from the bending part.

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

The neck portion 15 has an opening line 15a near the tip that is processed to facilitate opening. By cutting and removing the tip along the opening line 15a, a spout can be formed at the tip of the neck 15. As a method for forming the unsealing line 15a, various known processing methods such as cold cutter processing 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 of the non-fused region R1 is located at the center of the packaging bag 1 in the width direction. That is, the widthwise center of the non-fused region R1 generally coincides with the widthwise center of the packaging bag 1.

The second member 12 constituting the front surface of the neck portion 15 has a total of three embossments: a main emboss 121 provided at the center in the width direction, and sub-embosses 122 and 123 provided one each on both sides of the main emboss in the width direction. has.
The main embossing 121 is a convex embossing that is convex toward the outside of the packaging bag 1, as shown in FIG. The main embossing 121 extends linearly from below the base of the neck portion 15 along the widthwise center of the non-fused region R1, and has an upper end 121a located above the opening line 15a.

As shown in FIG. 3, the sub-embosses 122 and 123 are concave embossments that are convex toward the inside of the packaging bag 1, and the packaging bag 1 has a groove-like appearance. The secondary embossments 122 and 123 are both linear and non-parallel to the main embossment 121. The positions of the lower ends of the secondary embossments 122 and 123 are generally the same as the main embossment 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 from the main emboss 121 increases as each approaches the upper end. The secondary embossments 122 and 123 extend above the base of the neck portion 15, but their upper ends do not reach the heat-sealed edges and are located below the upper end of the main embossment 121.

In the packaging bag 1, the heat-sealed portions 20 that seal both ends in the width direction are formed with a generally constant width over the height direction. Thereby, the packaging bag 1 has an internal space that is approximately the same shape as the outer shape and one size smaller than the outer shape.

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

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

The user inserts the distal end of the neck 15 into the opening of another container, with the distal end of the neck 15 facing downward. The shape of the distal end side of the neck portion 15 is suitably maintained by the stiffness of the second member 12, which has 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 15 due to gravity. The contents push the second member 12 from inside the packaging bag 1, and as a result, the second member 12 bends along the main embossing 121 and the sub-embosses 122, 123.
At this time, the main embossing 121 is bent to be convex when viewed from the outside of the packaging bag 1, and the sub-embossments 122 and 123 are bent to be concave when viewed from the outside of the packaging bag 1. As a result, a prismatic three-dimensional space that serves as a flow path for the contents is formed in front of the non-fused region R1 of the neck. This three-dimensional space is suitably maintained while the contents are refilled into another container because the main embossment 121 and the sub-embossments 122 and 123 function like bones. Therefore, in the packaging bag 1, blockage or narrowing of the flow path during refilling is suitably prevented, and refilling operations can be performed smoothly.

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

A plurality of packaging bags were produced in which the front part 10, the rear part 40, and the bottom part 60 were made of the same material, layer structure, and dimensions, and differed only in the form of the embossing formed on the neck part. The dimensions of each part of the packaging bag were: height 183 mm, maximum width 100 mm, bottom height when not filled 30 mm from the bottom edge, neck formation position 118 mm from the bottom edge, and neck length (before opening) 50 mm.

In the embossing, the mode of the main embossing was fixed, and only the mode of the sub-emboss was varied.
The main embossing was a linear convex embossing with a length of 62 mm.
The secondary embossing was a linear embossing with a length of 31.4 mm, and a plurality of sample packaging bags were produced by changing the following parameters.
・Sub-emboss shape (convex emboss or concave emboss)
・Distance between the upper end of the secondary embossing and the heat-sealed area around the neck (5 types: 0mm, 3mm, 5mm, 7mm, and 8mm)
・The angle that the secondary embossing makes on the main embossing side and lower side with respect to the line extending in the width direction of the packaging bag (6 types: 53°, 58°, 63°, 73°, 78°, and 83°)

Each sample packaging bag was filled with 200 ml of water and sealed by heat-sealing the upper end.
After that, remove the tip of the neck to form a spout, lightly grasp and lift the lower part of the neck to the extent that the contents do not move into the non-fused region R1, and in this state, connect the first member of the spout. The maximum distance to the second member was measured. The evaluation was made in the following three levels, with △ and ○ being considered as passing.
(×: bad): 0mm (closed)
(△: fair): more than 0 mm and less than 1 mm (○: good): 1 mm or more The embossing mode and evaluation results of each sample are shown in Table 1.

From the results of Samples 1 to 6, it was considered that the angle of the secondary embossing is preferably about 55° to 80°.
The results of Samples 4 and 7 to 10 showed that the distance between the upper end of the sub-emboss and the heat-sealed area on the periphery of the neck is preferably 7 mm or less, and that the upper end and the heat-sealed area may be in contact with each other. .
The results of Sample 11 showed that the secondary embossing was required to be a 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 content of the above embodiment, etc., and various changes may be made to each component without departing from the spirit of the present invention. It is possible to add or delete.

For example, the packaging bag of the present invention is not limited to a standing pouch, and therefore does not need to have a bottom.
Furthermore, 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 structure, the front portion may be formed by bending a single laminated film. may be formed.

The waist strength of the second member is preferably 20 mN/15 mm or more. In this case, the upward position of the neck is suitably maintained by the second member, and the neck is prevented from unintentionally bending downward.
The stiffness of the film-like member can be measured using, for example, a loop stiffness tester (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 orientation in the processing flow direction (MD direction), and a pushing amount (squashing distance) of 12 to 15 mm.

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

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

1 Packaging bag 10 Front part 15 Neck part 40 Rear part 121 Main embossing 122, 123 Secondary embossing

Claims (4)

A packaging bag formed by facing a front part formed of a laminate and having a neck and a rear part formed of a laminate , and heat-sealing the peripheral edge including the periphery of the neck ,
The neck portion has a base portion at a middle portion in the height direction of the packaging bag and extends upward,
The tip of the neck is located below the upper end of the packaging bag,
The laminate forming the front surface of the neck is
a convex main emboss extending in the height direction at the widthwise central portion of the neck;
a concave sub-emboss provided on both sides of the main emboss in the width direction;
The angle that the secondary emboss makes on the main emboss side and below with respect to a line extending in the width direction of the packaging bag is 55 degrees or more and 80 degrees or less,
The main embossing and the secondary embossing extend across the base from the upper side to the lower side of the base,
packaging bag. The distance between the upper end of the secondary embossing and the heat-sealed peripheral edge is 7 mm or less,
The packaging bag according to claim 1. The lumbar strength of the laminate forming the front surface of the neck 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 portion is located at the center in the height direction of the packaging bag or above the center in the height direction.

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