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Injection molding method and injection molding apparatus

A technology of injection molding and post-molding, applied in the field of injection molding methods and injection molding devices

Inactive Publication Date: 2011-07-20
TOYODA GOSEI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, even with the existing manufacturing method of the resin molded product, it is not enough to effectively prevent the strain state (such as shrinkage) from being generated on the front surface of the resin molded product having the convex portion.
[0011] That is, in the conventional manufacturing method of the resin molded product, only the inner bottom of the raised portion is squeezed by compressed air, so that it is possible to prevent shrinkage etc. Insufficient to effectively prevent shrinkage, etc.

Method used

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  • Injection molding method and injection molding apparatus
  • Injection molding method and injection molding apparatus
  • Injection molding method and injection molding apparatus

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no. 1 example

[0105] Next, with reference to the accompanying drawings, a first embodiment relating to the injection molding method and the injection molding apparatus of the present invention will be described.

[0106] like Figure 1 to Figure 3 As shown, the injection molding method and the injection molding apparatus 1 of the first embodiment use a molding die 2 provided with a plurality of gas inlets 4 for introducing a gas G which presses the resin material 80 in the cavity 20 . In this way, by designing the timing of the injection of the gas G from the respective gas introduction ports 4 , it is possible to effectively avoid the occurrence of a strained state such as shrinkage or shrinkage marks on the front surface 801 of the resin molded product 8 .

[0107] like figure 2 and image 3 As shown, the injection molding apparatus 1 of the first embodiment includes: a molding die 2 and a resin inlet 23 , the molding die 2 is provided with a cavity 20 filled with a resin material 80 t...

no. 2 example

[0144] Next, with reference to the accompanying drawings, a second embodiment relating to the injection molding method and the injection molding apparatus according to the present invention will be described.

[0145] In the manufacturing method and manufacturing apparatus 101 of the resin-molded product 8 of the second embodiment, as Figure 10 As shown, the resin-molded article 108 is manufactured including an annular cross-sectional raised portion 182 that protrudes from the rear surface 902 of the plate-like body 181 .

[0146] like Figure 11 As shown, the manufacturing apparatus 101 includes: a forming die 102 in which a body cavity 121 for forming a plate-shaped body 181 is formed; and a boss cavity 122 for forming the boss 182 . In the molding die 102, in the inner molding wall 123 for forming the inner circumference 331 of the cavity 122 of the convex portion, the inner gas nozzle 103 is provided, and the body cavity 121 for molding the rear surface 902 of the plate-...

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Abstract

An injection molding apparatus includes a forming mold provided with a gas inlet through which a gas is introduced into an area between a rear molding surface in a cavity and a resin material inside the cavity. A plurality of the gas inlets is provided along a passage direction of the resin material in the cavity. In injection molding the resin molded article, a molten resin material is introduced into the cavity from a resin inlet and, when filling the inside of the cavity with the resin material, the introduction of the gas is sequentially started, beginning with a gas inlet provided in an area inside the cavity which is first filled with the resin material, thereby sequentially pressing the relevant resin material against a front molding surface of the cavity.

Description

technical field [0001] The present invention relates to an injection molding method and an injection molding apparatus in which a resin-molded article is obtained by injection-molding a resin material. Background technique [0002] For example, in the resin molded article manufacturing method in Japanese Patent No. 3,611,058, the patent is designed to prevent shrinkage of the front surface side of the molded article when molding the molded article having a partially thick wall on the rear surface side. [0003] That is, in Japanese Patent No. 3,611,058, in a cavity of a molding die for molding a molded product, a pressurized fluid introduction port is formed on the same side as the rear surface side (on which the thick wall is molded). Also on the rear surface side of the cavity, a portion corresponding to the thick-walled base is formed using a heat insulating material. [0004] In this way, the cooling of the resin in the vicinity of the thick-walled base by the heat-insu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/57B29C45/03B29C45/76B29C45/17B29C45/26
Inventor 伊藤达朗川岛大一郎竹田和生
Owner TOYODA GOSEI CO LTD