Patent ID: 8123998
Filing Date: 2012-02-28
Classification: B29C

Abstract:
1. An injection molding method of a plate-shaped substrate made of resin to be joined to a covering material, the injection molding method comprising the steps of: coupling a die of one side, which forms one surface of the substrate with a die of another side, which forms another surface which is located on an opposite side of the substrate from the one surface and on which a fine flow path is provided and the covering material is to be joined so as to compose a cavity; first composing a part of the die of one side which forms a through-hole which is provided so that a size of the hole gradually becomes smaller in a direction from the one surface toward the another surface and which communicates with the fine flow path, by using a taper pin protruded from the die of one side toward the die of another side; filling the cavity with resin material so as to form the substrate; separating the substrate and the die of another side from each other by separating the die of one side and the die of another side from each other; and extruding the substrate to separate the substrate from the die of one side by further protruding the taper pin toward the die of another side to cause the taper pin to push an inner wall of the through-hole.