Resin tube container and preform thereof

Abstract

The resin tube container 1 has a bottomed barrel 3 which is drawn and blow-molded to be thin to connect with a mouth 2. A connected region between the barrel 3 and the mouth 2 is formed on a shoulder 5, and the barrel is flatly formed to be a tapered wedge together with a bottom face 4. Its preform 11 has a bottomed barrel 13 integrally formed in connection with a mouth 12. A connected region between the barrel 13 and the mouth 12 is formed on a concentric extending rim 15, a peripheral wall of the drum part being formed thicker in thickness than the wall of the mouth part, the bottom end being formed into a thinner flat bottom in wall thickness than the drum part, the drum part being tapered toward the bottom end on a slant, and the bottom end is formed in a flat bottom thinner in wall thickness than the drum part, whereby even the resin tube-like container molded by stretch-blowing can be used as a bottomed one without requiring a secondary working as in the case of a packaging container in an usual shape.

Description

technical field [0001] The present invention relates to a tubular container manufactured by stretch blowing from a resin molded preform and to the preform. Background technique [0002] Existing tubular containers are manufactured by stretch blow molding from preforms, the drum portion of which is cylindrical. After the drum part of the preform is formed into a cylindrical drum part with a thinner wall thickness and longer than the finished product length by stretch blow molding, the main molded product which is open at the lower end of the drum part is manufactured by cutting, and the The opening is closed by flattening and welding the lower end wall to form a flat bottom end. [0003] As a result, the cutting in the second process generates many chips, which tends to cause material waste. Also, even if the fragments can be used as recycled material, the recycling costs are high, making the cost relatively higher than that of conventionally shaped packaging containers. ...

AI Technical Summary

Problems solved by technology

[0003] As a result, cutting in the second process produces many chips, which tends to cause waste of material

Also, even if the fragments can be used as recycled material, recycling costs are higher, making the cost relatively higher than that of commonly used shapes of packaging containers

[0004] In addition, in the case where the lower end opening is closed by welding after the container is filled with the contents, debris, etc. may be easily mixed into the contents, and therefore, it is difficult to use such a container as a package for food, etc. due to contamination

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