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Injection mold pivoting stripper plate

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When, where, how and why to use them. Jim Fattori. When you install guide pins and guide bushings within the ejector housing, it is called a guided ejection system. Guided ejection systems greatly increase the longevity of a mold—but they also increase the cost.
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Injection Mold Manufacturing

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Tooling: The Lowdown on Guided Ejection Systems | Plastics Technology

An injection mold with a female mold portion and a male mold portion has a locking ring with beveled inner centering surfaces which, in a mold-closed position, embrace respective outer centering surfaces of the two mold portions for holding them precisely aligned for molding a thin-walled cup between a tapered core of the male portion and a cavity wall of the female portion. The core is surrounded by a stripper ring which rests on an internal shoulder of the locking ring concentric therewith and is entrainable with the latter by a stripper plate when the mold is opened. The two concentric rings may be interconnected by screws, by a snap ring, or by radially extending pins lodged in coplanar bores of the locking ring and engaging in a peripheral groove of the stripper ring, these pins having flattened faces or eccentric ends held in contact with one of the groove walls by mounting bolts which traverse the channels and secure the locking ring to the stripper plate. Especially for the molding of thin-walled cups and similar articles, it is essential to insure an exact alignment of the core with a coacting cavity in the female mold portion.
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US4307866A - Injection mold with floating stripper ring - Google Patents

The moldmaker, to a very large extent, must be credited with the many technical advancements achieved in the applications of plastics. The many talents and abilities of the mold-maker in turning raw steel into highly crafted, sophisticated process molds have been responsible for many of the plastic products used today. These molds are best utilized in combination with advanced microprocessor-controlled plastics processing equipment along with the latest in hydraulic technology. A judicious combination of processing, molds, and equipment has made possible the economical production of top-quality products in large quantities.
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Effective date : An injection mold with a female mold portion and a male mold portion has a locking ring consisting of two releasably interconnected annular members with respective tapering inner centering surfaces which, in a mold-closed position, embrace respective outer centering surfaces of the two mold portions for holding them precisely aligned for molding a thin-walled cup between a tapered core of the male portion and a cavity wall of the female portion. The core is surrounded by a stripper ring which is received with a certain amount of axial play between internal shoulders of the locking-ring members for joint entrainment by a stripper plate when the mold is opened.
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