Break-resisting structure for folding type plastic box broken line

Abstract

The invention provides an anti-rupture structure of a folding plastic box stitch, comprising a plurality of plastic box leaves forming all the surfaces of the box body by folding and the stitches between all box leaves. The invention is characterized in that the stitches are intermittent indentation lines formed by a plurality of convex parts and a plurality of concave parts convexly and concavely arranged along the line. The concave part is a concave trough lower than the surface of the box leaf; the profile shape of the concave trough is arc-shape, rectangle, taper or polygon; the concave troughs are arranged in the folding direction along the box leaves; the length of the concave trough is equal to the width of the stitch. The stitch of the invention is soft and rich in tenacity; the invention is easy to be folded and is not folded to be cracked or torn by repeated folding and bending; furthermore, the stitch presents lace shapes.

Description

【Technical field】 [0001] The invention relates to a plastic packaging box, in particular to an anti-fracture structure of a folded plastic box which can prevent the plastic box from being broken at the stitching place during processing or due to repeated folding. 【Background technique】 [0002] In daily life, people often see a variety of packaging materials, among which transparent plastic packaging boxes are the most commonly used. The items are clear at a glance. This type of transparent plastic packaging box is made by folding a whole piece of transparent plastic sheet according to the folding line. The folding lines of the existing plastic packaging boxes are all straight indentation lines with a certain depth pressed out by the embossing knife. Due to the thin and brittle nature of the plastic sheet, during processing, the embossing knife will The pressure must be moderate, if the pressure is too large, it will easily break, and if the pressure is too small, it will ...

AI Technical Summary

Problems solved by technology

The folding lines of the existing plastic packaging boxes are all straight indentation lines with a certain depth pressed out by the embossing knife. Due to the thin and brittle nature of the plastic sheet, during processing, the embossing knife will Appropriate pressure must be applied. If the pressure is too large, it will easily break. If the pressure is too small, it will not be easy to fold.

For plastic sheets with different materials and different thicknesses, it is necessary to readjust the pressure when stamping the creasing and folding lines, so it often produces a certain scrap rate and affects work efficiency.

Not only that, but when the creasing and folding lines are pressed to fold the packaging box, the packaging operation will be time-consuming and laborious because the creasing and folding lines cannot be too deep.

More importantly, the fold line of the existing plastic packaging box is a continuous indentation line with the same depth, and its toughness is very poor. Therefore, cracks or even cracks often appear at the fold line during the process of packaging items or after repeated folding and bending. Fracture phenomenon, so the scrap rate is high, and the straight crease line lacks aesthetic feeling

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