US 10,369,733 B2Granted

Synthetic resin molding and molding method therefor

AssigneeKasai Kogyo Co., Ltd.

InventorsShinya Hashimoto, Hiroki Komatsuzaki

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Abstract

A molding method for a synthetic resin molding that includes a molding body, a bent portion, and a flange. The bent portion and the flange are continuous in a longitudinal direction of the side edge. The flange includes a wide portion and a narrow portion. The molding method for the synthetic resin molding includes arranging a gate at a position corresponding to an end of one side of the flange in a longitudinal direction, setting a relationship S1≤S2, where S1 is a cross-sectional area of the wide portion of the flange, and S2 is a cross-sectional area of the narrow portion of the flange adjacent to and downstream from the wide portion in a flow of molten resin, and performing injection molding using a colored resin material containing a luster agent kneaded in the material.

Claims10

Dependent claims

A molding method for a synthetic resin molding, the method comprising:

preparing a mold configured to form the synthetic resin molding, the mold including
a molding body having a side edge,
a bent portion arranged on the side edge and bending in a first direction, and a flange extending from the bent portion in a second direction orthogonal to the first direction, the flange including a wide portion having a cross-sectional area S1,
a first narrow portion having a shorter length in the second direction than the wide portion, and a second narrow portion having a shorter length in the second direction than the wide portion, the second narrow portion having a cross-sectional area S2 equal to or larger than the cross-sectional area S1, the wide portion being arranged between the first narrow portion and the second narrow portion, and
a gate at a position corresponding to an end of the first narrow portion;
and
injecting a colored resin material from the gate into the mold, the colored resin material containing a luster agent kneaded in the material.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/507,340Filed 19 Jun 2015
Priority: JP 2014-23763725 Nov 2014
Published: US 2017/0305051 A126 Oct 2017
Granted: 6 Aug 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

B29C 45/37
Moulds: mould cavity walls , i.e. the inner surface forming the mould cavity, e.g. linings
B29C 45/0025
Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor: preventing…
B29C 45/16
Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor: making…
B29C 45/1704
Introducing an auxiliary fluid into the mould: the fluid being introduced into the interior of the injected material which is still in a molten…