Injection molded product

Patent metadata

Field	Value
Publication number	US-12552073-B2
Application number	US-202017766659-A
Country	US
Kind code	B2
Filing date	Oct 7, 2020
Priority date	Oct 10, 2019
Publication date	Feb 17, 2026
Grant date	Feb 17, 2026

Abstract

An injection molded product includes a main body portion having a design surface and an opposite surface; and a projecting portion provided at a peripheral edge portion of the main body portion, and projecting out toward a side opposite from the design surface in a thickness direction of the main body portion, wherein a thickness A of the main body portion and a thickness B of the projecting portion satisfy a relationship of A≥B.

First claim

The invention claimed is:

1 . An injection molded product comprising:
a main body portion having a design surface and an opposite surface and being shaped as a plate that is bent at a bent portion; and a projecting portion provided at a peripheral edge portion of the main body portion, and projecting out toward a side opposite from the design surface in a thickness direction of the main body portion, wherein a thickness A of the main body portion and a thickness B of the projecting portion satisfy a relationship of the following formula (1) when a cross-section of the main body portion is observed, the projecting portion exists at a terminal end of the main body portion, the projecting portion has a foamed layer at an interior thereof, and the thickness of the projecting portion is uniform,
A≥B   formula (1).

2 . The injection molded product according to claim 1 , wherein the main body portion has a foamed layer at an interior thereof.

3 . A method of manufacturing an injection molded product comprising:
a main body portion having a design surface and an opposite surface and being shaped as a plate that is bent at a bent portion; and a projecting portion provided at a peripheral edge portion of the main body portion, and projecting out toward a side opposite from the design surface in a thickness direction of the main body portion, wherein a thickness A of the main body portion and a thickness B of the projecting portion satisfy a relationship of the following formula (1), when a cross-section of the main body portion is observed, the projecting portion exists at a terminal end of the main body portion, and the thickness of the projecting portion is uniform,
the method comprising manufacturing steps that include a step of injecting a resin material from a gate into a cavity of a mold that has: a fixed side mold having the gate through which a resin material is injected; and a movable side mold that can move in opening/closing directions with respect to the fixed side mold, and that forms the cavity, which is a gap, between the movable side mold and the fixed side mold,
wherein a distance over which the resin material flows within the cavity is less than or equal to 600 mm,
A≥B   formula (1).

4 . The method of manufacturing an injection molded product according to claim 3 , wherein:
the manufacturing steps further include a step of, after filling an interior of the cavity with the resin material in the injecting step, moving the movable side mold in an opening direction from the fixed side mold, and enlarging a volume of the interior of the cavity, and the main body portion has a foamed layer at an interior.

Assignees

• Showa Denko Materials Co Ltd
• Resonac Corp

Inventors

• Funatsu Takeshi
• Nakano Shingo
• MITSUISHI Naoko
• Yamada Kouji
• Fujino Hiroaki
• Shiokawa Hirofumi
• Hirai Yoji

Classifications

• B29C44/02

  for articles of definite length, i.e. discrete articles · CPC title

• B29C45/0001

  characterised by the choice of material · CPC title

• B29L2031/3005

  Body finishings · CPC title

• B29K2023/12

  PP, i.e. polypropylene · CPC title

• B29C44/0407

  by regulating the temperature of the mould or parts thereof, e.g. cold mould walls inhibiting foaming of an outer layer · CPC title