Injection molded body, injection molding method, and injection molding die

Abstract

Provided are: an injection molding method that can be applied even to molded bodies that do not have a through hole and can eliminate a stringing phenomenon even in the case of molding a resin that is prone to the stringing phenomenon; an injection molding die used in the injection molding method; and an injection molded body obtained by means of the injection molding. The injection molding method is for synthetic resin injection molded body that is gate cut by means of die opening after injection molding by means of a pinpoint gate (9), wherein a runner (7) provided in a direction perpendicular to a first sprue (6) is passed from the first sprue (6) provided coaxially to the direction of injection of molten resin, the molten resin fills a cavity (10) from a gate opening (9a), which is of the pinpoint gate (9) formed at a cavity surface parallel to the direction of die opening, via the pinpoint gate (9) formed at the tip of a second sprue (8) provided horizontally with respect to the direction of injection of the molten resin, and after cooling, gate cutting is performed by means of die opening, and the injection molded body within the cavity (10) is taken out in an ejection step by means of an ejection pin (11).

Description

technical field [0001] The present invention relates to an injection molding method, an injection molding die, and an injection molded article suitable for use when a sliding synthetic resin with a high elongation rate is used. In particular, the present invention relates to a guide member formed of an injection-molded body in an electrophotographic device. Background technique [0002] In electrophotographic devices such as copiers and laser printers, toner is heated to a high temperature of about 200° C. in a fixing section to fuse the toner with heat and fix it on paper. After that, the paper is ejected using the eject rollers, eject guides (eject tabs). However, with the increase in speed in recent years, the paper and the fixed toner are gradually passing through the paper discharge section in a high temperature state. For this reason, the toner in a semi-molten state is more and more in contact with components such as discharge rollers, and heat resistance and non-ad...

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Problems solved by technology

[0004] The above-mentioned molten fluororesin has a large tensile elongation at breakage. Even after molding and cooling to about room temperature, when the mold is opened and the injection molded article is separated from the gate, due to the resin in the gate and the formed article The resin is pulled apart without being completely cut, so it causes the "stringing phenomenon" in which the resin stretches like a thread

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