Injection stretch blow molding method of a cylindrical narrow mouth container and a container

An injection stretch blow molding, cylindrical technology, applied in the field of containers, can solve the problems of cracking, deepening, lack of strength against impact, etc.

Inactive Publication Date: 2005-02-02
A K TECH LAB INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The seam 206 tends to become deeper, while the shoulder portion 204 includes a resin that is not stretched and thus lacks strength against impact, and therefore, the edge of the shoulder portion 204 sometimes suffers from impact caused by dropping or hitting other containers. and burst

Method used

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  • Injection stretch blow molding method of a cylindrical narrow mouth container and a container
  • Injection stretch blow molding method of a cylindrical narrow mouth container and a container
  • Injection stretch blow molding method of a cylindrical narrow mouth container and a container

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] Figure 1 to Figure 4 An example of a stretch blow molding method according to the invention is shown.

[0026] According to the present invention, if image 3 As shown, the injection cavity mold 31 and the neck mold 33 are closed, an injection core 34 is inserted into the cavity 32 through the neck mold 33, and molten metal is injected into the cavity 32 from the nozzle 36 at the bottom of the cavity 32. Resin (such as PET) is filled with, and cavity 32 forms the cylindrical body part 12 of a preform 11 and the bottom 15, and neck mold 33 forms a neck 13 that has external thread, and from neck mold 33 and injection Starting from the closed face of the cavity mold 31 , the body part 12 has a larger outer diameter and thicker walls than the neck 13 .

[0027] The stepped portion 14 formed between the main body portion 12 and the neck portion 13 has an outer diameter slightly larger than the main body portion 12 of the preform and slightly smaller than the main body por...

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PUM

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Abstract

The present invention relates to an injection stretch blow molding method of forming a cylindrical narrow mouth container comprising the following steps; injection molding a preform having a body portion integrally molded with a neck portion wherein the body portion is formed thicker-wall and larger outside diameter than the neck portion from a closing surface between a neck mold and an injection cavity mold, and having a step-out portion, wherein an upper surface of the step-out portion is formed by the closing surface of the neck mold between the neck portion and the body portion and the step-out portion has a smaller outside diameter than the body of the container, and stretch blow molding the preform to the container in a blow cavity mold, wherein a body portion of the container is formed thin-wall from around the upper surface of the step-out portion, and the step-out portion and an expanded portion around the upper surface of the step-out portion form a shoulder portion of the container flat, and also the outside diameter of the step-out portion is smaller than the outside diameter of the open end of a cap.

Description

technical field [0001] The present invention relates to an injection stretch blow molding method for manufacturing a cylindrical narrow-mouth container having a flat shoulder portion and the manufactured container for cosmetics, medical instruments, etc. Background technique [0002] According to conventional stretch-blow-molded containers, the bottom of the mouth of the formed preform is thicker than the main body as an expanded portion (step portion), and the expanded portion forms a support as a stopper for the lid (refer to patent 1: Japanese Patent Laid-Open No. 2003-011212). [0003] Furthermore, another conventional art discloses a preform for manufacturing a small flat container, the preform having a thick-walled main body portion with a locally reduced thickness leaving a stepped portion between the neck and the main body (Reference Patent 2: Japanese Patent Laid-Open No. 2003-011211). [0004] In a cylindrical narrow-mouth container having a flat shoulder portion...

Claims

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Application Information

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IPC IPC(8): B65D1/02B29C49/00B29C49/06B29C49/08B29C49/12B29L22/00B65D1/00
CPCB29B2911/14486B29L2031/7158B29B2911/14326B29B2911/14333B29C49/0073B29B2911/1402B29L2031/718B29K2067/00B29B2911/1404B29C49/06B29C49/12B29B2911/14473B29B2911/14033B29B2911/1444B29B2911/14026B29C2949/28B29C2949/26B29C2949/24B29C2949/22B29C2949/0725B29C2949/072B29C2949/0723B29C2949/0724B29C2949/0731B29C2949/0722B29C2949/0732B29C2949/0733B29C2949/073B29C2949/0773B29C2949/0778B29C2949/078B29C49/071B29C49/42087B29C2049/023B29C49/42454B29C2949/0715
Inventor 竹内节行
Owner A K TECH LAB INC
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