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US 5,093,067 AGranted
Injection molding of fabric reinforced elastomeric diaphragms
AssigneeAllied-Signal Inc.
InventorChristopher M. Gibson
Life of this patent
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Abstract
A method of injection molding and a mold for the forming of a thin walled fabric reinforced elastomeric diaphragm. According to the method, a thin, precut, preformed sheet of fabric material is placed within a suitable injection mold cavity. Subsequently, a high molecular weight elastomer is injected into the mold cavity in a controlled manner to prevent migration or weave distortion of the fabric material.
Claims12
A method of forming a complex shaped thin walled fabric-reinforced rolling elastomeric diaphragm comprising:
- forming a thin woven fabric material into a complex shape;
- clamping said thin fabric material within a mold cavity of an injection molding machine;
- said mold cavity having a maximum cross-sectional thickness of approximately 0.035 inches corresponding to the rolling portion of said diaphragm;
- preparing an elastomeric material having a high viscosity of at least 500 poise for injection molding;
- injecting said high viscosity elastomeric material into said mold cavity under a pressure of between 200 to 2000 pounds per square inch;
- directing the flow of said elastomeric material over said fabric material, then allowing said elastomeric material to penetrate the fabric material thereby preventing localized stress concentrations and weave distortion within said fabric material;
- and
- applying heat and pressure to cure said elastomeric material.
5 more elements
Dependencies are inferred from the claim text.