JP2021181328A - Packaging bag and packaging body - Google Patents

Abstract

To provide a packaging bag that can be easily manufactured and has a stable spout opening.SOLUTION: In a packaging bag 1 formed by facing a front part 10 formed of a laminated body and having a neck part 15 and a rear part formed of a laminated body, and heat-sealing the peripheral edges of the front part and the rear part, the neck part has a base part in the height middle of a packaging bag and extends upward, the tip of the neck part is located below the top of the packaging bag, the laminated body constituting the front surface of the neck part includes a projecting main embossment 121 extending in the height direction at the central part in the width direction of the neck part, recessed sub-embossments 122 and 123 provided on both sides in the width direction of the main embossment, and recessed lower embossments 124 and 125 extending downward from the vicinity of the lower end of the embossment and extending in the width direction of the packaging bag. An angle formed by the sub-embossment on a main embossment side and a 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.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. Further, the packaging body in which the contents are filled in this packaging bag is also referred to.

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) made 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 main container and then tilting the bag-shaped container.

Japanese Unexamined Patent Publication No. 2005-88894

In the pouch described in Patent Document 1, the nozzle portion is normally bent downward. Therefore, the state in which the spout is opened due to this broken line at the time of refilling 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 turned upward in the normal state, filling of the contents becomes complicated at the time of manufacturing the pouch.
Further, as will be described in detail later, how to open the spout depends on the amount of contents.

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 a spout.

The first aspect of the present invention is a packaging bag formed by heat-sealing the peripheral edges of a front portion formed of a laminated body and having a neck portion and a rear portion formed of the laminated body facing each other.
The neck portion has a base at the height intermediate portion 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 includes a convex main emboss extending in the height direction at the center of the neck in the width direction, concave sub-embosses provided on both sides of the main emboss in the width direction, and the vicinity of the lower end of the sub-emboss. It has a concave lower emboss that extends downward from and in the width direction of the packaging bag. The angle 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 is 55 ° or more and 80 ° or less.

The second aspect of the present invention is a package in which the contents are filled in the packaging bag according to the first aspect, and the volume of the contents is less than 90% of the full capacity of the packaging bag.

The packaging bag and package 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. 3 is a cross-sectional view taken along the line I-I of FIG. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. It is a figure which shows the experimental example which examined the effect of the packaging bag.

An embodiment of the present invention will be described with reference to FIGS. 1 to 4.
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 refill container for various liquids such as seasonings, detergents, and cosmetics.

FIG. 2 is a cross-sectional view taken along the line I-I 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 in the front view and is long in the vertical direction (height direction), and the dimension in the left-right direction (width direction) is 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 with 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 heat-sealed portion 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 where the contents C are 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, and 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 second member 12 which is not bent, 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 is 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 portion 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 processed to be easy to open 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 end portion of the non-fused region R1 is located at the center 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 includes a main embossing 121 provided in the central portion in the width direction, sub-embossing 122 and 123 provided on both sides of the main embossing in the width direction, and main embossing and sub-embossing. It has a total of three types of embossing, lower embossing 124 and 125 provided at the bottom of the embossing.

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 portion 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-emboss 122 and 123 are substantially the same as those of the main emboss 121 in the height direction of the packaging bag 1. The distance between the main embossed 121 and the sub-embossed 122 is the same as the distance between the main embossed 121 and the sub-embossed 123, and the distance between the main embossed 121 and the sub-embossed 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.

The lower embosses 124 and 125 are concave embosses similar to the secondary embosses. The lower embosses 124 and 125 extend substantially in a straight line from the vicinity of the lower ends of the sub-embosses 122 and 123 toward the widthwise end of the packaging bag 1, and are separated from each other as they approach the lower end of the packaging bag 1. The positions of the upper ends of the lower embosses 124 and 125 are substantially the same as the positions of the lower ends of the sub-embossed 122 and 123 in the width direction of the packaging bag 1.

In the packaging bag 1, the heat-sealed 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 face 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 work of the contents is not hindered even if the neck portion 15 faces upward, and the filling work 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 toward 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 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 the 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 embossed 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 in the neck portion. This three-dimensional space is suitably retained while the contents are refilled into another container by the main embossing 121 and the sub-embossing 122, 123 acting like bones. Therefore, in the packaging bag 1, blockage or narrowing of the flow path during refilling is suitably prevented, and the refilling work can be smoothly performed.

The inventor found that in a packaging bag provided with main embossing and sub-embossing, the spout may not open properly when the amount (volume) of the filled contents is small, and the problem is solved by providing a lower embossing. bottom. Hereinafter, it will be described in detail.
When the contents are stored only in the region below the main emboss and the sub-emboss in the packaging bag 1 due to the small amount of the contents, the width of the second member 12 is lower than the main emboss and the sub-emboss. There is a slight bend that extends in the direction. This bending prevents the contents from communicating with the lower region and the three-dimensional space. As a result, it becomes difficult for the shape change of the lower region to be transmitted upward, which causes the spout to not open properly.
Such a phenomenon is likely to occur when the amount of the contents is less than a certain ratio (for example, 90%) with respect to the full capacity of the packaging bag 1. The "full capacity" in the present invention means the maximum filling amount that does not cause overflow of the contents when the packaging bag 1 is filled and sealed by the filling machine.

When the lower emboss is provided in the lower region, the second member 12 bends along the lower emboss, so that a slight bend extending in the width direction does not occur. As a result, the contents located in the lower region have a shape that rises toward the three-dimensional space along the lower embossing. As a result, even when the lower region and the three-dimensional space communicate with each other and the shape change of the lower region is suitably transmitted upward and the content is small with respect to the full capacity, the spout can be easily opened. Further, even when the packaging bag 1 is inserted into another container, the contents are smoothly introduced into the three-dimensional space from the lower region, and refilling can be performed efficiently.

As a countermeasure against the difficulty of opening the spout when the content is small, it is conceivable to reduce the substantial capacity of the lower region by forming an additional heat fusion region in the lower region. However, in this case, the shape of the heat bar is changed and an additional heat fusion process is required, which complicates the production.
Since the lower embossing of the packaging bag 1 of the present embodiment can be formed at the same time as the main embossing and the sub-embossing, no additional manufacturing process is required. Further, since the front part and the rear part are not joined in the area where the lower emboss is provided, the full capacity of the packaging bag does not change. Therefore, the spout can be suitably opened in a wider range of filling amount without lowering the production efficiency, and the versatility is remarkably improved.
The packaging bag 1 of the present embodiment is particularly suitable for manufacturing a package in which the filling amount of the contents is small with respect to the full capacity.

The experimental results regarding the above-mentioned effects according to the packaging bag 1 of the present embodiment are shown below. FIG. 4 shows a plan view of each experimental example used for the study.
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 mode of the second member 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 formation position, and 50 mm in neck length (before opening). The full capacity of the packaging bag based on the above definition is 200 ml.
The main emboss was a linear convex emboss with a length of 62 mm.
The sub-embossing was a linear concave embossing having a length of 31.4 mm, and the parameters were as follows.
・ Distance between the upper end of the sub-emboss and the heat fusion site around the neck 3 mm
・ The angle 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 is 73 °.

In Experimental Examples 1 and 2, additional heat fusion regions were formed without the lower embossing.
In Experimental Example 1, additional heat fusion regions were formed at both ends in the width direction of the region below the main emboss and the sub-emboss. That is, the volume of the lower region is reduced.
In Experimental Example 2, additional heat fusion regions were formed at both ends in the width direction of the region slightly below the bend line L. Therefore, the volume of the lower region has not changed.
In Experimental Examples 3 to 5, lower embossing was formed without providing an additional heat fusion region. The mode of lower embossing is as follows.
Length: 31.4 mm
Tilt angle of the lower emboss (the angle between the lower emboss and the line extending in the width direction on the main emboss side):
Experimental example 3: 45 °
Experimental example 4: 27 °
Experimental example 5: 0 ° (horizontal)

Each sample packaging bag was filled with water as a content.
After that, the lower side of the neck was lightly grasped and lifted to check the opening of the spout. In each experimental example, the opening degree of the spout was confirmed with five kinds of filling amounts of 140 ml, 150 ml, 160 ml, 180 ml, and 200 ml, and the case where the spout was opened well was taken as the appropriate capacity.

FIG. 4 shows the range of appropriate capacity in each experimental example.
In Experimental Example 1, although the spout was well opened, the volume of the lower region was reduced, making it impossible to fill 180 ml and 200 ml.
In Experimental Example 2, the spout did not open well at all filling volumes, and 180 ml and 200 ml filling became impossible.
In Experimental Example 5, there was no change in the full capacity, but the spout did not open well in the range of 140 ml to 160 ml, and the range of the appropriate volume was the same as that without the lower embossing. It is probable that the lower embossing in this example showed almost the same behavior as the above-mentioned light bending, so that the range of the appropriate capacity could not be expanded.
In Experimental Examples 3 and 4, the spout could be satisfactorily opened even with a filling amount of less than 90% of the full capacity without reducing the full capacity, and the range of the appropriate capacity could be expanded. In Experimental Example 3, the spout was well opened at all filling volumes.
From the results of Experimental Examples 3 to 5, it was considered that the inclination angle of the lower embossing needs to be at least 20 °, preferably about 25 ° to 60 °.

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 suitably 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 by 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 direction as the processing flow direction (MD direction), and a pushing amount (crushing distance) of 12 to 15 mm.

The main embossing, the sub-embossing, and the lower embossing may not be perfectly straight, for example, may be slightly curved.
It is preferable that the lower end of the lower embossing is located below the upper surface of the contents when the contents of the assumed filling amount are stored in the lower region. Further, it is preferable that the heat fusion portions are close to both sides in the width direction.
In the first member of the neck portion, a convex emboss similar to the main emboss may be formed between the spout and the bending line L. In this way, the spout can be opened more easily.

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 124, 125 Lower emboss

Claims (5)

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.
The tip of the neck is located below the top of the packaging bag.
The laminate constituting the front surface of the neck portion is
A convex main emboss extending in the height direction at the center of the neck in the width direction,
Concave sub-embossing provided on both sides of the main embossing in the width direction,
It has a concave lower emboss that extends downward from the vicinity of the lower end of the sub-emboss and toward the width direction of the packaging bag.
The angle 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 is 55 ° or more and 80 ° or less.
Packaging bag. The inclination angle of the lower emboss is 20 ° or more and 60 ° 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 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.
The packaging bag according to claim 1. A package in which the contents are filled in the packaging bag according to any one of claims 1 to 4.
The volume of the contents is less than 90% of the full capacity of the packaging bag.
Packaging body.

Images