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US 6,887,419 B2Granted
De-gating mold for injection molding of elastic materials
AssigneeMGS Mfg. Group, Inc.
InventorsDennis J. Payette, Thomas W. Woloszyk, Stuart J. Nitschke, Brian Hartlmeier, John J. Hahn
Life of this patent
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Abstract
A multi-material runner gate system allows effective de-gating of elastomeric materials that would otherwise stretch and/or flex reducing de-gating forces at the gate upon separation of the molds.
Claims8
A method of de-gating a molded part formed by injection of an elastomeric material in a mold cavity, the elastomeric material being introduced into the mold cavity through a runner passage and the de-gating removing a runner formed in the runner passage from the molded part, the method comprising the steps of:
- (1) molding a runner support structure within a portion of the runner passage by the injection of a substantially inelastic material into the runner passage, the substantially inelastic material stopping before entry into the mold cavity from the runner passage, the inelastic material being substantially less elastic than the elastomeric material;
- (2) molding the part by the injection of elastomeric material into the mold cavity through the runner passage past the substantially inelastic material into the mold cavity adjacent to the portion;
- and
- (3) de-gating a runner composed of both the substantially inelastic material and the elastic material by removing the runner from the molded part, the substantially inelastic material in the runner reducing stretching and breaking of the elastic material of the runner at locations away from the junction of the runner and the molded part.
1 more element
Dependencies are inferred from the claim text.