Injection-compression mold
AssigneeFuji Photo Film Co., Ltd.
InventorSeiichi Watanabe
Life of this patent
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Abstract
An injection-compression mold having a stationary part and a movable part which are used for injection-molding a molten thermoplastic resin, at least one spring member with one end fixed to at least one of the mold parts and the other arranged so that it can abut against the opposite mold part when the mold is clamped in order that the bias force of the spring member to absorb the clamp force of a molding machine.
Claims6
An injection-compression mold, comprising:
- a stationary part and a movable part which are used for injection-molding a molded piece from molten thermoplastic resin;
- at least one spring means having one end fixed with respect to one of said stationary and movable parts and another end arranged to apply force against the other of said stationary and movable parts when said mold is clamped, said at least one spring means for decreasing a force of pressing a mold cavity by utilizing a bias force of said spring means to oppose a clamp force applied to clamp said mold to assist said molten thermoplastic resin in forcing a separation of said mold during an injection molding operation.
An injection-compression mold controlling a clamping force in conformity with a condition in which a mold cavity is filled with a resin, said injection-compression mold comprising:
- stationary mold means and movable mold means being clampable together and forming a mold cavity therebetween for use in injection-molding a molded piece from molten thermoplastic resin;
- at least one spring means having one end fixed with respect to one of said stationary and movable mold means and another end arranged to apply force against the other of said stationary and movable mold means when said mold is clamped, said at least one spring means for:
- decreasing, utilizing a bias force of said spring means, a clamping force exerted between said stationary mold means and movable mold means in a predetermined clamping range proximate to positions where said stationary and movable mold means contact each other, to assist said resin in effecting a subsequent forced separation of said stationary and movable mold means due to pressure from injection-molded thermoplastic resin.
Dependencies are inferred from the claim text.