To provide a resin molded object capable of ensuring the high molding precision of the valve part of a valve element, for example, when the valve element being the resin molded object is injection-molded.
This valve structure using the resin molded object is equipped with the valve element 5 provided in a valve body in a freely slidable manner and a valve seat permitting the contact with or separation from the valve part 10a of the valve element. The valve element is molded from a synthetic resin material by an injection molding machine 20. The leading end openings 25a and 26a of a pair of the gate parts 25 and 26 of the injection molding machine are formed so as to be opened in the vicinity of the valve part molding region 23c of a cavity 23 for molding the valve part of the valve element to allow the molten resin injected in a second cavity part 23b to flow along the inner peripheral surface of the valve part molding region to enhance the transfer properties of the molten resin to the inner peripheral surface of the valve part molding region becoming the outer peripheral surface of the valve part.
COPYRIGHT: (C)2004,JPO&NCIPI
Masahiko Hara
Kobayashi Hiroshi
長野電材株式会社
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