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A resin molded part, a manufacturing method thereof and a mold

A technology of resin molding and manufacturing methods, applied in the direction of coating, etc., can solve problems such as damage to the appearance, and achieve the effect of suppressing the deterioration of the appearance

Active Publication Date: 2019-01-15
KOITO MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, there is a problem that the appearance is damaged due to the weld line (Weld Line) generated between the gates

Method used

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  • A resin molded part, a manufacturing method thereof and a mold
  • A resin molded part, a manufacturing method thereof and a mold
  • A resin molded part, a manufacturing method thereof and a mold

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Embodiment Construction

[0035] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings and the like. In addition, in the description of the drawings, the same reference numerals are assigned to the same elements, and overlapping descriptions are appropriately omitted.

[0036] (mold)

[0037] figure 1 (a) is a cross-sectional view showing a schematic structure of a die according to this embodiment, figure 1 (b) in figure 1 An enlarged view of the region A shown in (a).

[0038] figure 1 The mold 10 shown in (a) includes a movable side mold 12 , a fixed side mold 14 , a hot runner nozzle 16 , and a valve pin 18 . A gate 20 is formed in the fixed-side mold 14 . The gate diameter X of the gate 20 according to this embodiment (refer to figure 1 (b)) in (b)) is about 2 to 3 mm.

[0039] The fixed-side mold 14 has a curved portion 14 b extending from the opening edge 20 a of the gate 20 to the cavity-side inner wall 14 a of the fixed-sid...

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Abstract

A resin molded part suppressing appearance deterioration near a gate trace, a manufacturing method thereof and a mold are provided. The resin molded part (26) is manufactured through injection molding. A gate trace (28) having a peripheral wall (26a) is formed on the surface (26a) of the resin molded part (26). The curvature R of the peripheral base (26c) of the peripheral wall (26a) is 0.5-1.0 mm, with no weld bond visually recognized from outside.

Description

technical field [0001] The present invention relates to a resin molded article, a method for manufacturing the resin molded article, and a mold. Background technique [0002] Conventionally, a resin molded article using injection molding (Injection Molding) is known. In addition, along with the increase in size of resin molded parts, a method of injecting resin from multiple gates has also been proposed. In this case, there is a problem that the appearance is impaired due to weld lines generated between the gates. In contrast to this, a method has been proposed to prevent the generation of weld lines that affect the appearance by shifting the timing of filling resin from each gate (see Patent Documents 1 and 2). [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2013-1019 [0006] Patent Document 2: Japanese Patent Laid-Open No. 2013-129121 Contents of the invention [0007] The problem to be solved by th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/00B29C45/27
CPCB29C45/0025B29C45/2708B29C2045/0027
Inventor 八木孝将
Owner KOITO MFG CO LTD