JP2000212528A - Edge-protecting tape for packaging material at inside of packaging container and packaging container using the tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging container for containing milk, juice, etc., not generating interlaminar separation at both edges of an edge-part protecting tape for protecting edges of a packaging material. SOLUTION: This edge-protecting tape 10 has a multi-layer structure, wherein the outmost two layers are made from a thermoplastic resin and have such a structure that the outmost two layers are integrally molded to wrap the edges of the other inner layers at the edges of the edge-protecting tape 10. The packaging container of which the inside is sealed with the edge part- protecting tape 10 can surely keep the seal strength in the vertical direction and consequently prevent leakage of the contained liquid, because a problem of generating interlaminar separation from the both edges of the edge-protecting tape 10 caused by penetration of the contained liquid is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging container made of a paper substrate, and more particularly to a packaging container for packaging liquids such as milk and juice.

[0002]

2. Description of the Related Art Conventionally, a packaging container made of a paper base material has been used as a packaging container for filling a content liquid such as milk or juice for reasons such as easy treatment after use and easy portability. The packaging container is formed into a tubular shape by vertically sealing a band-shaped packaging material, filling the content therein, forming a semi-pack with upper and lower horizontal seals, and then into a desired polygonal column-shaped packaging container. Form. At this time, in order to prevent an accident that the edge of the packaging material directly touches the content liquid, the edge of the packaging material directly expands due to the penetration of the content liquid and the internal solution leaks, In order to protect and seal the vicinity of the end, a strip-shaped end protection tape formed by laminating a thermoplastic resin is melt-pressed to cover the end of the packaging material. Although the end protection tape has a multilayer structure, at least two outermost layers are generally made of a thermoplastic resin of polyethylene or an ethylene copolymer. Since the polyethylene or ethylene copolymer is widely used on the inner and outer surfaces of the packaging material main body, when the vertical sealing and the horizontal sealing of the packaging material are performed, the end protection tape has no problem with the packaging material. It can be fused.

[0003]

In the vertical line sealing portion, an accident such as leakage of the internal solution due to expansion of the end portion due to penetration of the content liquid occurs due to the end of the packaging material directly touching the content liquid. In order to prevent the problem, or to further supplement the edge protection and the sealing performance near the edge, an elongated strip-shaped edge protection tape formed by laminating a thermoplastic resin is melt-pressed to form the edge of the packaging material. Is covered. However, the conventional strip-shaped end protection tape is formed by laminating an end protection tape formed by laminating a thermoplastic resin so that the end of the packaging material does not directly touch the contents in the bent vertical line seal portion, and the above-mentioned melt-pressed end protection tape is used. Even if the edges of the packaging material are covered, both ends of the edge protection tape itself are in contact with the content liquid, so the problem of the edges of the packaging material itself has been solved. There was a problem that there might be.

[0004]

According to the first aspect of the present invention,
An end protection tape to be attached to an end of a vertical sealing portion of a packaging material appearing inside a packaging container formed of a packaging material made of a paper base material, wherein the end protection tape has a multilayer structure, and has two outermost layers. Is formed of a thermoplastic resin,
An end protection tape inside a packaging container, characterized in that the outermost two layers are integrally formed at the end of the protection tape so as to enclose another inner layer. Therefore, the end protection tape is melt-pressed to cover the end of the packaging material so that the end of the packaging material does not directly contact the content liquid in the vertical line seal portion, and the content is also applied from both ends of the end protection tape itself. The problem of delamination due to liquid penetration has been eliminated.
According to the second aspect of the present invention, there is provided an end protection tape to be attached to an end of a vertical line seal portion of a packaging material appearing inside a packaging container formed of a packaging material made of a paper base material, wherein the end protection tape is a multilayer. And the outermost two layers are formed of a thermoplastic resin, and the outermost two layers are integrally formed at the end of the protective tape so as to enclose another inner layer. Is an end protection tape inside the packaging container. Therefore, the end protection tape is melt-pressed to cover the end of the packaging material so that the end of the packaging material does not directly contact the content liquid in the vertical line seal portion, and the content is also applied from both ends of the end protection tape itself. Since the problem of delamination due to liquid permeation was eliminated, the desired packaging container was obtained, in which the vertical line sealing strength was reliably maintained and the leakage of the content liquid did not occur.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described, but before that, the structure and manufacturing process of the packaging container 20 will be briefly described. As shown in FIG.
Is made of a packaging material 22 made of a material mainly made of paper subjected to a liquid leakage preventing process. The packaging material 22
Is composed of an outer layer 61, a paper base 62, an adhesive layer 63, a barrier layer 64, an adhesive layer 65, and an inner layer 66 which are formed in order from the outside to the inside of the packaging container 20 as shown in FIG. Usually, the outer layer 61, the adhesive layers 63 and 65, and the inner layer 66 are formed of a thermoplastic resin such as polyethylene or an ethylene copolymer. The barrier layer 64 is formed of aluminum foil or the like, and has an outer surface of the outer layer 61,
Alternatively, predetermined printing is performed on the outside of the paper base 62 as necessary. Next, a process of filling the packaging container 20 with the content liquid will be briefly described with reference to FIG. The packaging material 22
Are formed in a manufacturing process (not shown), a vertical sealing 4 is performed by a filling device (not shown) so as to form a cylindrical shape, and a continuous cylindrical packaging material is formed. Next, after forming the horizontal seal portion 2 in the width direction of the cylindrical packaging material and forming the container bottom, the content liquid flows thereinto.
Then, by forming another horizontal seal portion 2 in the width direction at another predetermined position and forming the top of the container, a semi-filled liquid filled in the cylindrical packaging material between the pair of horizontal seal portions 2 is formed. A package 1S is formed. Thereafter, after the semi-package is cut off from the continuous tubular packaging material, the flap portion is folded and a container having a desired shape as shown in FIG. 3 is formed.

FIG. 1 is a diagram for explaining an embodiment of the present invention.
The state of sticking of the end protection tape 10 in the vertical line seal portion 4 inside the packaging container is shown. As can be seen from the figure, in the end protection tape 10 attached to the end of the vertical line seal portion 4 of the packaging material appearing on the inner side of the packaging container formed by the packaging material made of the paper base material, the end protection tape is The outermost two layers are made of a thermoplastic resin such as polyethylene or ethylene copolymer resin. The outermost two layers are protected by a process (not shown) so as to enclose other resin layers inside. Since it is an end protection tape inside the packaging container, which is formed integrally at the end of the tape, the end of the packaging material does not directly touch the contents in the vertical line seal portion, and the end The problem of delamination occurring due to the penetration of the content liquid from both ends of the protective tape itself has been eliminated. The method for producing the end protection tape utilizes a so-called encapsulation effect in which, when resins having different physical properties are simultaneously co-extruded, the outermost layer naturally wraps the inner layer due to the different properties of the resin. Therefore, according to the manufacturing method, the process can be simplified as compared with the case of the multilayer coating by the conventional extrusion method, so that there is an effect of quality improvement and cost reduction. The end protection tape has a multilayer structure. The outermost two layers are formed of polyethylene or ethylene copolymer resin, but the inner layer can be freely combined with barrier resin such as PET or EVOH and other materials depending on the application. And these are not excluded from the present invention.

[0007]

As is apparent from the above description, according to the first aspect of the present invention, the end of the vertical line sealing portion of the packaging material that appears inside the packaging container formed of the packaging material made of paper base material. Wherein the outermost protective layer has a multilayer structure, the outermost two layers are formed of a thermoplastic resin, and the outermost two layers surround the other inner layers. It is an end protection tape inside a packaging container characterized by a structure formed integrally at the end of the tape. Therefore, the end protection tape is melt-pressed to cover the end of the packaging material so that the end of the packaging material is not directly exposed to the content liquid in the vertical line seal portion, and the content liquid is applied from both ends of the end protection tape. The problem of delamination due to permeation is eliminated. According to the second aspect of the present invention, there is provided an end protection tape to be attached to an end of a vertical line sealing portion of a packaging material appearing inside a packaging container formed of a packaging material made of a paper base material. Has a multi-layer structure, wherein two outermost layers are formed of a thermoplastic resin, and the two outermost layers are integrally formed at an end of the protective tape so as to surround another inner layer. It is an end protection tape inside a packaging container characterized by the above-mentioned. Therefore, since the end protection tape is melt-pressed and covers the end of the packaging material so that the end of the packaging material is not directly exposed to the content liquid in the vertical line seal portion, the content liquid is applied from both ends of the end protection tape. This eliminates the problem of delamination due to permeation and ensures the desired strength of vertical line seal strength and does not cause leakage of the content liquid.

[0008]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an end protection tape of a packaging material according to the present invention and a diagram showing an embodiment of attaching the end protection tape.

FIG. 2 is a view showing an embodiment of a horizontal line sealing portion of the packaging container according to the present invention.

FIG. 3 is a perspective view of a packaging container according to the present invention.

FIG. 4 is a diagram showing a cross section of a packaging material according to the present invention.

FIG. 5 is a cross-sectional view of a conventional end protection tape of a packaging material according to the present invention and a diagram showing an embodiment of attachment of the conventional end protection tape.

[0009]

[Explanation of symbols]

 2 horizontal line seal part 4 vertical line seal part 10 end protection tape 20 packaging container 22 packaging material 1S semi-pack 61 outer layer 62 paper base 63 adhesive layer 64 barrier layer 65 adhesive layer 66 inner layer

[0010]

Claims (2)

[Claims] 1. An end protection tape to be attached to an end of a vertical line seal portion of a packaging material appearing inside a packaging container formed of a packaging material made of a paper base material, wherein the end protection tape has a multilayer structure. The outermost two layers are formed of a thermoplastic resin, and the outermost two layers are integrally formed at the ends of the protective tape so as to enclose the ends of the other inner layers. End protection tape inside the packaging container. 2. An end protection tape to be attached to an end of a vertical line seal portion of a packaging material appearing inside a packaging container formed of a packaging material made of a paper base material, wherein the end protection tape has a multilayer structure. The outermost two layers are formed of a thermoplastic resin, and the outermost two layers are integrally formed at the ends of the protective tape so as to enclose the ends of the other inner layers. A packaging container to which an edge protection tape inside the packaging container is applied.