CN212331643U

CN212331643U - High-transparency thin-wall container in-mold label joint structure

Info

Publication number: CN212331643U
Application number: CN202020435932.XU
Authority: CN
Inventors: 黄庆卫; 吴来国; 肖美忠
Original assignee: Fujian Henglong Plastic Industrial Co ltd
Current assignee: Fujian Henglong Plastic Industrial Co ltd
Priority date: 2020-03-30
Filing date: 2020-03-30
Publication date: 2021-01-12
Anticipated expiration: 2030-03-30

Abstract

The utility model discloses a high-transparency thin-wall container in-mold label joint structure, wherein an in-mold label is fused on the outer surface of a container through an in-mold labeling process, the in-mold label is in a fan shape made of PP (polypropylene) materials, and when two ends of the in-mold label are butted, the formed joint is an oblique line which is more than or equal to 10 degrees in the plastic flowing direction of the side wall of the container during injection molding; after the scheme is adopted, the joint which is originally parallel to the plastic flowing direction during injection molding is inclined by more than 10 degrees, so that the stress concentration position caused by the joint is staggered with the plastic flowing direction, the stress concentration is dispersed, and the container is prevented from being broken due to the stress concentration when being subjected to external force.

Description

High-transparency thin-wall container in-mold label joint structure

Technical Field

The utility model relates to a packing container, in particular to a label stuck in a mould for a high-transparency thin-wall packing container.

Background

The in-mold label is made by placing a printed paper, composite or film label inside a mold prior to injection molding or other thermoforming to produce a plastic cup or tub or box. The in-mold labeling packaging container is manufactured and used in a large amount in food, chemical industry and other industries at present. In-mold labeling labels conventionally have straight seams (i.e., the label is fan or rectangular) which generally do not have problems with strength when the container is made of thicker wall thickness dimensions or non-transparent PP material, and in-mold labeling has been practiced by the industry with straight seams.

However, when the container is a thin-walled container and a high-transparency PP material (random copolymer PP material) is adopted, the high-transparency PP material is more brittle than other PP materials, so that the container is easily broken at the labeled seam due to external forces such as extrusion, falling and the like during canning, storage, transportation and use. The reason for this is that, as shown in fig. 1, in the injection molding process of the container 1, the glue is usually injected from the bottom of the container, and the molten plastic is first filled to the bottom and then flows toward the mouth of the container along the height direction of the container (arrow direction in the figure) until the container is completely filled and cooled. The toughness of the product is best in bending along the plastic flow direction (i.e., the height of the container) and is worst in bending perpendicular to the material flow direction (i.e., the circumferential direction of the container). The vertical seam 21' (the line in bold in fig. 1) of the in-mould label 2 is parallel to the plastic flow direction. As shown in fig. 2, the thickness of the label 2 is generally 0.05-0.07mm, and correspondingly, in the area covered by the label 2, the thickness of the wall of the container 1 is reduced by 0.05-0.07mm, so that the whole container surface is flat, the seam of the label 2 is not completely closed, and a convex beam is formed on the wall of the container 1, as shown in the cross section of fig. 2, two small steps 11 with right angles are formed, the height of the small step 11 is the same as the thickness of the fused label 2 and container 1, and the step 11 can cause a stress concentration effect in the injection cooling process, so that the strength of the whole container at the label seam 21' becomes the weakest.

The existing solutions ignore the important influence factor of the seam shape of the label, and only adopt a thickened container wall (which causes material increase, injection molding cycle extension and cost increase) or use other injection molding materials (which greatly reduces the transparency of thin-wall volume, so that the product can not achieve the high-transparency appearance required by customers).

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can avoid when receiving external force the container because of stress concentration fracture the used seam structure of in-mould label of high transparent thin wall container.

The in-mold label joint structure of the high-transparency thin-wall container is characterized in that an in-mold label is fused on the outer surface of the container through an in-mold labeling process, wherein the in-mold label is made of a PP (polypropylene) material, and joints at two ends of the in-mold label are oblique lines which form an included angle of more than or equal to 10 degrees with the plastic flowing direction of the side wall of the container during injection molding.

After the scheme is adopted, the joint which is originally parallel to the plastic flowing direction during injection molding is inclined by more than 10 degrees, so that the stress concentration position caused by the joint is staggered with the plastic flowing direction, the stress concentration is dispersed, and the container is prevented from being broken due to the stress concentration when being subjected to external force.

Drawings

FIG. 1 is a schematic diagram of a prior art structure;

FIG. 2 is a schematic view of a cross section A-A and a partial structure at B in the prior art;

fig. 3 is a schematic structural diagram of the present invention.

Description of reference numerals:

1. a container; 11. a step; 2. a label; 21. seaming; 21' vertical seam.

Detailed Description

In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.

Please refer to fig. 3, the utility model relates to a high used mould inner label seam structure of passing through thin wall container, mould inner label 2 is the fan-shaped of PP material, both ends are the slash, fuse with thin wall container 1 lateral wall through the mode of in-mould labeling, mould inner label 2 around container 1 lateral wall round, its both ends form slash seam 21 (thick slash in fig. 3), seam 21 and the container flow direction of lateral wall plastics (that is the container direction of height) are the contained angle more than or equal to 10 when moulding plastics. After the oblique line seam is adopted, the seam direction is different from the flowing direction of the side wall plastic during injection molding, and the stress generated in the injection molding cooling process is staggered along the oblique line in the flowing direction of the side wall plastic and is not concentrated on the seam like in the prior art.

The utility model overcomes people paste the technical bias that the mark label can only adopt straight label seam in the mould, only change label seam shape and can not solve the problem in the conventional cognition. This application makes the stress of seam department no longer concentrate through the rational design to seam angle, makes the container no longer easily break under the prerequisite when high transparent thin wall container adopts the in-mould labeling technology like this, has obtained unexpected technological effect.

The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent shapes or structural changes made by the contents of the specification and the drawings or directly or indirectly applied to other related technical fields are included in the same way in the protection scope of the present invention.

Claims

1. The utility model provides a high thin wall container mould inner label seam structure that passes through, the mould inner label fuses at the container surface through the in-mould labeling technology which characterized in that: the in-mold label is made of PP materials, and seams at two ends of the in-mold label are oblique lines which form an included angle of more than or equal to 10 degrees with the plastic flowing direction of the side wall of the container during injection molding.