JP7408943B2 - packaging bag - Google Patents

Description

The present invention relates to a flexible packaging bag, and more particularly to a self-supporting packaging bag that is self-supporting and has improved pourability and filling suitability.

A flexible packaging bag is a packaging bag obtained by heat-sealing the peripheral edge of a laminate having a heat-sealing layer on the inner surface, and is widely used as a container for storing various contents. In particular, so-called standing pouches, which have a gusset on the bottom so that they can stand on their own, are widely and commonly used as containers for refilling toiletries, detergents, and the like.

Various improvements have been made to refill containers to improve workability during refilling. These include the shape and structure of the spout to improve the pouring speed, the ease of opening the spout, and the structure to prevent the front and back laminates from adhering to each other and reducing pourability.

On the other hand, in the process of filling the packaging bag with contents, it is difficult to fill the standing pouch from the bottom, so a filling opening has to be provided at the top of the packaging bag, and the pouch has a complicated structure. It has sometimes been difficult to coexist with an outlet and a wide filling opening.

The packaging bags described in Patent Document 1 and Patent Document 2 filed by the applicant have a branch at the top of the packaging bag and have a structure where the pouring part and the filling opening are separated and independent, so they do not solve the above problem. Although we were able to resolve the issue, when we actually filled the container with the contents, we found that, although it is extremely rare, pinholes may form at the branch and the contents may leak out.

It was discovered that the cause of this was that if wrinkles were formed on the inside of the folded part used to provide the branch, and vibrations during transportation or impact from dropping were applied, this would cause pinholes.

Another problem is that in the packaging bags described in Patent Documents 1 and 2, when dispensing the contents, the packaging bag is folded in two and the contents are squeezed out. Since the position is biased toward the top of the packaging bag, the lengths of the two bags are different, making this operation difficult.

Japanese Patent Application Publication No. 2018-52591 JP 2018-52592 Publication

The problem to be solved by the present invention is to provide a packaging bag in which a pouring part and a filling opening are separated, which is less prone to wrinkles and pinholes due to vibrations caused by transportation after filling the contents, and which also makes pouring work easier. We are proposing bags.

The invention for solving the above problems is a packaging bag composed of a lower surface laminate, an upper surface laminate, a back laminate, and a bottom tape, each having a base material layer and a sealant layer, The sealant layers of each laminate are made to face each other and the peripheral edges are heat-sealed to form a bottom surface laminate, a lower part of the back laminate, and a bottom tape folded into an inverted V shape inserted between them. The lower half and bottom part of the packaging bag are formed by heat-sealing the left and right side seal parts and the bottom seal part with the respective sealant layers facing each other, and the upper surface laminate has a base material layer formed by folding lines. The upper part of the lower surface laminate is turned inward by 180°, and the upper part of the lower surface laminate and each sealant layer are faced to each other, and the spout sealing part is heat-sealed to form a spout part, and the upper part of the lower surface laminate and each sealant layer are The filling opening is formed by heat-sealing the side seal portions with the sealant layers facing each other, and the fold line is located at the center of the packaging bag in the height direction, and the spout is The distance from the fold line to the filling opening is longer than the distance to the tip of the part, and the side seal part is semicircular or half-shaped so that the side seal part protrudes inward at the part where the fold line intersects with the left and right side seal parts. This packaging bag is characterized by having an elliptical reinforcing seal portion formed therein.

The packaging bag according to the present invention has a semi-circular or semi-elliptical reinforcing seal part formed at the part where the folding line intersects with the left and right side seal parts so that the side seal part protrudes inward, so that after filling the bag with contents, It was possible to prevent wrinkles and pinholes caused by vibration during transportation.

The present invention also provides a packaging bag comprising a lower surface laminate, an upper surface laminate, a back laminate, and a bottom tape, each having a base material layer and a sealant layer. The sealant layers are made to face each other and their peripheral edges are heat-sealed, and each sealant layer is formed by the lower surface laminate, the lower part of the back laminate, and the bottom tape folded into an inverted V shape inserted between these layers. The lower half and bottom part of the packaging bag are formed by heat-sealing the left and right side seal parts and the bottom seal part while facing each other. The upper part of the lower surface laminate is folded back and the respective sealant layers are opposed to each other, and the spout sealing part is heat-sealed to form a spout part, and the upper part of the lower surface laminate and each sealant layer are faced to each other to form a spout part. A filling opening is formed by heat-sealing the side seal parts facing each other, and the fold line is located at the center in the height direction of the packaging bag, and the distance from the fold line to the tip of the spout is The distance from the fold line to the filling opening is longer than that, and the shape is semicircular or semi-elliptic so that the side seal part protrudes inward just below the position where the fold line intersects with both the left and right side seal parts. This packaging bag is characterized by having a shaped reinforcing seal portion formed therein.

Further , the spout portion has a holding tab with a wide spout seal portion .

Further , the pouring spout portion is characterized in that it has an opening assisting line consisting of a half-cut line formed on the base material layer at a portion that becomes the pouring spout .

Further , the dimensions of the packaging bag are characterized in that the width is 110 mm or more and 140 mm or less, the height is 200 mm or more and 230 mm or less, and the bottom folded width is 30 mm or more and 40 mm or less.

The packaging bag according to the present invention has a structure in which a filling opening is provided to form a branch on the back side of a normal standing pouch, and the distance from the folding line to the tip of the spout is shorter than the distance from the folding line to the tip of the spout. Since the distance to the filling opening is longer, the spout does not get in the way during filling, resulting in good filling suitability.

In addition, since the folding line is located at the center of the packaging bag in the height direction, when refilling, when the back layer is folded in half at the folding line with the spout facing down, the bottom and filling The lengths of the openings are equal, making it easy to squeeze out the contents.

By forming a semicircular or semi-elliptical reinforcing seal part at the position where the fold line intersects with the left and right side seal parts, or just below the fold line so that the side seal part protrudes inward, the content is improved. When the packaging bag is filled with items and swells, wrinkles are less likely to form at the spout, thus preventing the laminate from tearing or pinholes due to wrinkles.

If a holding tab with a wider spout seal part is provided on the spout, the holding tab will make it easier to maintain the container attached to the refilling container during refilling, improving operability. improves.

When the spout section is provided with an auxiliary opening line consisting of a half-cut line formed on the base material layer at the portion that will become the spout, opening becomes smooth and the unsealing property is improved.

When the range of dimensions of the packaging bag is set as described, the characteristics of the present invention can be utilized to the fullest, and a packaging bag that is excellent in durability, operability, and handleability can be obtained.

FIG. 1 is a schematic plan view showing one embodiment of a packaging bag according to the present invention. FIG. 2 is a cross-sectional explanatory diagram schematically showing a cross section taken along the line AA' in FIG. The circles in the figure are partially enlarged explanatory views of the laminate. FIG. 3 is an explanatory plan view showing a state in which the contents are poured into the main container from the packaging bag according to the present invention. FIG. 4 is a cross-sectional explanatory diagram schematically showing a cross section taken along line BB' in FIG. FIG. 5 is a schematic plan view showing another embodiment of the packaging bag according to the present invention, and is an example in which the reinforcing seal portion is disposed directly below the fold line. FIG. 6 is a schematic plan view showing a comparative example of the packaging bag according to the present invention, and is an example in which the reinforcing seal portion is arranged on the fold line. FIG. 7 is a schematic plan view showing a comparative example of the packaging bag according to the present invention, and is an example in which a reinforcing seal portion is not provided.

The packaging bag according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic plan view showing one embodiment of a packaging bag according to the present invention. FIG. 2 is a cross-sectional explanatory diagram schematically showing a cross section taken along the line AA' in FIG. The circles in the figure are partially enlarged explanatory views of the laminate.

A packaging bag 1 according to the present invention includes a lower surface laminate 4 having at least a base material layer 2 and a sealant layer 3, an upper surface laminate 5, a back laminate 6, and a bottom tape 7. The bag is made by making the sealant layers of each laminate face each other and heat-sealing the peripheral edges.

The lower front laminate 4, the lower part of the back laminate 6, and the bottom tape 7 inserted between them and folded into an inverted V shape with the sealant layer 3 on the outside, the respective sealant layers 3 facing each other. A lower half and a bottom portion 13 of the packaging bag 1 are formed by heat-sealing the left and right side seal portions 9 and the bottom seal portion 10.

The upper surface laminate 5 is folded back by 180° along the fold line 8 with the base material layer 2 inside, and the upper surface of the lower surface laminate 4 and each sealant layer 3 are made to face each other, and the spout seal portion 11 is heated. The spout part 14 is formed by sealing, and the filling opening 17 is formed by heat-sealing the side seal part 9 with the upper part of the back surface laminate 6 and each sealant layer 3 facing each other. .

In the packaging bag 1 according to the present invention, the fold line 8 is located at the center in the height direction of the packaging bag 1, and the distance from the fold line 8 to the tip of the spout part 14 is shorter than the distance from the fold line 8 to the tip of the spout part 14. The distance to the opening 17 is longer, and a semicircular or semielliptical reinforcing seal portion 12 is provided at the portion where the folding line 8 intersects with both the left and right side seal portions 9 so that the side seal portion 9 protrudes inward. The biggest feature is that it is formed.

In the packaging bag 1 according to the present invention, since the spout part 14 and the filling opening 17 are completely separated, the degree of freedom in designing the spout part is increased, and when pouring out the contents. Improved ease of opening and pouring.

In addition, the folding line 8 is located at the center of the packaging bag 1 in the height direction, and the distance from the folding line 8 to the filling opening 17 is longer than the distance from the folding line 8 to the tip of the spout 14. As a result, when filling the packaging bag 1 with the contents, the spout 14 does not become an obstacle, and the filling suitability is improved.

In addition, by forming a reinforcing seal part 12 in a semicircular or semi-elliptical shape so that the side seal part 9 protrudes inward at the part where the folding line 8 intersects with both the left and right side seal parts 9, the contents can be removed from the filling opening. When filled with items, as the body of the packaging bag 1 expands, the spout 14 smoothly deforms along the body without any wrinkles or the like appearing at the fold line 8, thereby preventing wrinkles or the like. There are no pinholes, and there are no problems such as liquid leakage even when exposed to vibrations during transportation or impact from drops.

Regarding the shape of the reinforcing seal portion 12, a semicircular shape or a semielliptical shape is preferable, and a shape with corners such as a rectangular shape or a square shape is not preferable. This is because if the reinforcing seal part has corners, the appearance after filling with the contents will be distorted.

Regarding the position of the reinforcing seal part 12, a part of the reinforcing seal part 12 rests on the part where the folding line 8 intersects with both the left and right side seal parts 9, or the reinforcing seal part 12 is located so that the folding line 8 intersects with both the left and right side seals. It has been confirmed through experiments that it is sufficient as long as it is in contact with the position where it intersects with the part and just below it.

If the reinforcing seal part 12 is located away from and above the folding line 8, or if it is apart from and below the folding line 8, the effect of the reinforcing seal part will not be exhibited. If the reinforcing seal part is not present, the effect of the reinforcing seal part will not be exhibited, as a matter of course.

In the packaging bag according to the present invention, there is a high degree of freedom in designing the spout part 14, so for example, as shown in FIG. 1, the spout seal part 11 can be partially expanded to form a holding tab 15. You can also do it. In this way, as shown in FIG. 3, when refilling the main container 19 with the contents, the holding tabs 15 on both sides can be held with both hands to safely perform the refilling operation.

An auxiliary opening line 16 may be provided at the portion of the spout section 14 that is to serve as a spout to facilitate opening. The opening auxiliary line 16 is one or more half-cut lines on the base material layer 2 of the laminate. Such a half-cut line may be provided by a cutter or by a laser processing machine using a laser.

The structure of the laminate used in the packaging bag according to the present invention will be described. As the base material layer 2, a synthetic resin film that is suitable for printing processing and has heat resistance is generally used. Specifically, polyester resins such as polypropylene resin (PP), polyethylene terephthalate resin (PET), polybutylene terephthalate resin (PBT), and polyethylene naphthalate resin (PEN), cellophane, cellulose triacetate (TAC) resin, etc. Cellulose resin, polymethyl methacrylate resin (PMMA), ionomer resin, polybutene resin, polyacrylonitrile resin, polyamide resin such as nylon-6 and nylon-66, polystyrene resin (PS), polyvinyl chloride resin ( Synthetic resin films such as PVC), polyvinylidene chloride resin (PVDC), and polycarbonate resin (PC) are used.

As the material of the sealant layer 3, polyolefin resin is generally used, and specifically, low density polyethylene resin (LDPE), medium density polyethylene resin (MDPE), linear low density polyethylene resin (LLDPE), Ethylene resins such as ethylene-vinyl acetate copolymer (EVA), ethylene-α olefin copolymer, ethylene-methacrylic acid resin copolymer, blend resin of polyethylene and polybutene, homopolypropylene resin (PP), Polypropylene resins such as propylene-ethylene random copolymers, propylene-ethylene block copolymers, propylene-α-olefin copolymers, etc. are used.

Although not particularly illustrated, an intermediate layer may be provided between the base material layer 2 and the sealant layer 3. The intermediate layer is used for the purpose of adjusting the strength, thickness, and stiffness of the laminate, and imparting gas barrier properties. As the intermediate layer, a synthetic resin film similar to that used for the base layer 2 and the sealant layer 3 can be used. When the intermediate layer is used as a gas barrier layer, a gas barrier film such as a polyvinylidene chloride film, a polyvinyl alcohol film, an ethylene vinyl alcohol copolymer film, a gas barrier nylon film, a gas barrier polyethylene terephthalate (PET) film, or a PET film can be used. metal vapor-deposited films in which metals such as aluminum are vapor-deposited on PET films, inorganic oxide vapor-deposited films in which inorganic oxides such as aluminum oxide and silicon oxide are vapor-deposited on PET films, polyvinylidene chloride coatings, and water-soluble resin and inorganic layered films. A gas barrier coating layer such as a resin layer made of a film containing a compound or a film formed by reacting a metal alkoxide or its hydrolyzate with an isocyanate compound, or a metal foil such as aluminum foil can be used.

As for the dimensions of the packaging bag 1 according to the present invention, it is preferable that the width is 110 mm or more and 140 mm or less, the height is 200 mm or more and 230 mm or less, and the bottom folded width is 30 mm or more and 40 mm or less. The bottom folding width is the length of a perpendicular line from the folding line where the bottom tape 7 is folded to the end of the bottom tape. When the packaging bag has dimensions within this range, the characteristics of the packaging bag of the present invention are fully exhibited.

1 Packaging bag 2 Base material layer 3 Sealant layer 4 Lower surface laminate 5 Upper surface laminate 6 Back laminate 7 Bottom tape 8 ... Folding line 9... Side seal part 10... Bottom seal part 11... Outlet seal part 12... Reinforcement seal part 13... Bottom part 14... Outlet part 15... Holding tab 16... Opening auxiliary line 17... Filling opening 18... Filling seal portion 19... Main container

Claims (4)

A packaging bag comprising a lower surface laminate, an upper surface laminate, a back laminate, and a bottom tape, each having a base material layer and a sealant layer,
The sealant layers of each laminate are made to face each other and the peripheral edges are heat-sealed,
The lower surface laminate, the lower part of the back laminate, and the respective sealant layers of the bottom tape folded into an inverted V shape inserted between these are placed to face each other, and the left and right side seal portions and the bottom seal portion are heat-sealed. This forms the lower half and bottom of the packaging bag.
The upper surface laminate is folded back 180 degrees along the fold line with the base material layer inside, and the upper surface of the lower surface laminate and each sealant layer are made to face each other, and the spout sealing portion is heat-sealed to form a spout. At the same time, a filling opening is formed by heat-sealing the side seal portion with the upper part of the back side laminate and each sealant layer facing each other,
The folding line is located at the center in the height direction of the packaging bag, and the distance from the folding line to the filling opening is longer than the distance from the folding line to the tip of the spout,
A packaging characterized in that a semicircular or semielliptical reinforcing seal portion is formed immediately below the position where the folding line intersects with both left and right side seal portions so that the side seal portion protrudes inward. bag. The packaging bag according to claim 1, wherein the spout portion has a holding tab with a wide spout seal portion. 3. The packaging bag according to claim 1, wherein the spout portion has an opening aid line formed of a half-cut line formed in the base material layer at a portion that becomes the spout. Any one of claims 1 to 3, wherein the dimensions of the packaging bag are a width of 110 mm or more and 140 mm or less, a height of 200 mm or more and 230 mm or less, and a bottom folded width of 30 mm or more and 40 mm or less. Packaging bag as described in .

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