Process for producing molded item of thermosetting resin and injection molding machine therefor

An injection molding device and manufacturing method technology, applied to the field of manufacturing of molded products made of thermosetting resins and injection molding devices, capable of solving problems such as time-consuming removal of burrs, low viscosity, reduced strength and quality of molded products, etc.

Inactive Publication Date: 2009-10-14
TOSHIN SEIKO CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Here, when the viscosity of the raw material resin is high during injection molding, even if a large-diameter vent hole is provided for sufficient gas removal, the raw resin with high viscosity will not enter the vent hole; In the resin injection molding method, the viscosity of the raw material resin is low, so if the hole diameter of the vent hole is increased, there is a problem that the raw material resin flows into the vent hole, and burrs formed by the resin flowing into the vent hole tend to be formed on the molded product.
There...

Method used

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  • Process for producing molded item of thermosetting resin and injection molding machine therefor
  • Process for producing molded item of thermosetting resin and injection molding machine therefor
  • Process for producing molded item of thermosetting resin and injection molding machine therefor

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no. 1 Embodiment approach

[0145] Figure 1 to Figure 7 It is a figure which shows 1st Embodiment of this invention.

[0146] First, the resin molded article of this embodiment will be described.

[0147] Such as figure 1 and figure 2 As shown, this resin molded product 1 is a molded product obtained by molding by liquid resin injection molding (LIM method) using the mold proposed by the present applicant in Japanese Patent Application No. 2006-73625. That is, when the product part (in this example, a lens (such as a convex lens, a Fresnel lens, etc.) in a transparent optical element) 2 is molded by liquid resin injection molding from a thermosetting resin such as silicone resin, an overflow is provided on the mold. Receiving part to prevent residual air bubbles in product part 2. Therefore, the resin molded product 1 obtained by using the technical solution of the aforementioned Japanese patent application has the overflow portion 4 formed in the aforementioned overflow receiving portion in additi...

no. 2 Embodiment approach

[0207] Next, a second embodiment of the present invention will be described.

[0208] First, the resin molded article according to this embodiment has the same configuration as that of the first embodiment.

[0209] Next, the injection molding apparatus according to this embodiment will be described.

[0210] The configuration of the injection molding apparatus of the present embodiment is the same as that of the first embodiment except for the mold, so description of the entire injection molding apparatus will be omitted, and only the mold will be described.

[0211] Figure 8 ~ Figure 12 It is a figure which shows the mold of the injection molding apparatus concerning this embodiment. Figure 8 is the profile diagram of the mold, Figure 9 yes Figure 8 The enlarged view of the main part, Figure 10 is a schematic cross-sectional view of the mold on the fixed side of the mold, Figure 11 It is a schematic cross-sectional view of the mold on the movable side of the mold...

no. 3 Embodiment approach

[0254] Next, a third embodiment of the present invention will be described.

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Abstract

A process for producing a molded item of thermosetting resin, and injection molding machine therefor, capable of preventing burring and bubble inclusion at molding operation. There is provided a process for producing a molded item of thermosetting resin with the use of a mold having a cavity for forming a product part, a gate forming a gate part, a runner forming a runner part and an overflow catcher communicating with the cavity and forming an overflow part, which process comprises the injection step of injecting a liquid resin until filling the region from the runner through the gate to the cavity and further the region from the cavity to the overflow catcher; the hardening step of heating the liquid resin within the mold so as to effect hardening; the demolding step of detaching a resin molded item having the runner part, gate part, product part and overflow part from the mold; and the cutting step of cutting the gate part and overflow part off the product part of the demolded resin molded item.

Description

[0001] Technical division [0002] The present invention relates to a method of manufacturing a molded article made of a thermosetting resin and an injection molding apparatus for molding a molded article made of a thermosetting resin by liquid resin injection molding. Background technique [0003] In general, injection molding is known as a method of molding plastic products (or parts). In addition, in the case of injection molding a thermosetting resin, there is known a liquid resin injection molding method (LIM: Liquid Injection Molding), which injects a liquid thermosetting resin (liquid raw material resin, hereinafter sometimes referred to as liquid resin) into a high-temperature mold. Then it is heat cured. This method is a molding method in which liquid raw material resin is injected into a high-temperature mold and then heated and solidified. [0004] In addition, in order to prevent the gas in the cavity of the mold from remaining in the molded product when injectin...

Claims

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Application Information

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IPC IPC(8): B29C45/40B29C45/17B29L11/00
Inventor 铃石光信斋藤明弘宇参郭晃平间浩之饭渊一郎五十岚俊晴吉村雅志
Owner TOSHIN SEIKO CO LTD
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