Abstract: A pointed heat-generating device for molds of injection molding machines comprises a heat-generating body with a conical portion at its front end, a disc-shaped flange at its rear end, a metal casing therebetween, a plurality of first passages in the metal casing for passing a focused resin therethrough, and a plurality of second passage in said flange and communicating with the first passages.
Type:
Grant
Filed:
November 30, 1984
Date of Patent:
February 17, 1987
Assignees:
Shigeru Tsutsumi, Seiko Engineering and Research Co. Ltd.
Abstract: This invention relates to cap means for preventing resin from remaining in a mold of a runnerless injection molding apparatus. The cap means is of a frusto-conical profile and incorporated in a space formed adjacent to a front end of a heating cylinder. Further, the cap means is provided with an opening from which a pointed tip member of the heating cylinder can project. The invention aims at removing resin scorching, its thermal decomposition, inconveniences of color or material exchange or the like.
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