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Container formed by stretch forming and process for producing the same

A technology for stretch forming and containers, applied in the field of stretch forming containers and their preparation

Inactive Publication Date: 2013-01-02
TOYO SEIKAN KAISHA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011]However, compared with the one-step blow molding method, the two-step blow molding method has many molding processes, so there is a problem of equipment cost and high energy cost. Capable of providing a polyester stretch-formed container with excellent heat resistance that can withstand high temperatures above 100°C by one-step blow molding

Method used

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  • Container formed by stretch forming and process for producing the same
  • Container formed by stretch forming and process for producing the same
  • Container formed by stretch forming and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0180] Polyethylene terephthalate resin ([PET 1] (RT543CTHP: Japan Unipet Co., Ltd.) is used as the main material, and polyethylene naphthalate resin [HomoPEN] (TN8065S: Teijin )) As the type of blend polyester, dry-mixing is carried out in the ratio of main material: blend polyester type=95:5 by weight, and the material is fed to the hopper of the injection molding machine. Under the condition of a cycle time of 30 seconds, injection molding was performed to obtain a preform for a bottle with a diameter of 28 mm.

[0181] The mouth portion of the preform was crystallized and whitened in advance, and then biaxially stretch-blow-molded to obtain a stretch-blow bottle with a volume of 500 ml. In this case, the heating temperature of the preform, that is, the stretching temperature was set to 115°C, and the heat setting temperature of the blow mold was set to room temperature (25°C).

[0182] Cut out various parts of the bottle, and measure the following items in the above-menti...

Embodiment 2

[0190] Main material by weight ratio: the ratio of blend polyester type=90:10, the materials are dry mixed, and fed to the hopper of the injection molding machine. In addition, other stretch blow blowers are made in the same way as in Example 1. Plastic bottle, carries out every measurement described in embodiment 1.

Embodiment 3

[0192] Main material by weight: the ratio of blend polyester type = 85: 15, the materials are dry mixed, and fed to the hopper of the injection molding machine. In addition, the stretch blow molding is made in the same way as in Example 1. bottle, and carry out the various assays described in Example 1.

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Abstract

A stretch-formed container having a layer comprising a blend of an ethylene terephthalate type polyester resin and another material, characterized in that the layer comprising the blend has a dispersion structure composed of a continuous phase comprising the ethylene terephthalate type polyester resin and a dispersed phase comprising the other material and that at least the container body part has a tand maximum temperature of 115 DEG C or lower in a dynamic viscoelasticity examination. Due to the constitution, even when the mechanical stretching rate reaches a limit, strain hardening effectively occurs. Thus, a stretch-formed container of a polyester resin can be provided which has both of excellent heat resistance attributable to high-temperature stretching and a stretch balance attributable to strain hardening.

Description

technical field [0001] The present invention relates to a stretch-formed container comprising a polyester resin and a method for producing the same, and more particularly, to a stretch container having both excellent heat resistance due to high-temperature stretching and stretch balance due to strain hardening. Stretch shaped container and its preparation method. Background technique [0002] Stretch-molded containers made of thermoplastic polyester resins such as polyethylene terephthalate have excellent transparency and surface gloss, as well as impact resistance, rigidity, and gas barrier properties required for containers such as bottles and cups. Used as containers for various beverages and foods. [0003] However, stretch-molded containers made of polyester resins have the disadvantage of poor heat resistance, and thermal deformation or volumetric shrinkage deformation occurs when the contents are hot-filled. A heat fixing (heat setting treatment) operation is perfor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C49/08B29C49/64B65D1/00C08L67/02B29L22/00B29K67/00
Inventor 山田俊树菊地淳
Owner TOYO SEIKAN KAISHA LTD
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