Method for preparing silicone mold tooling
First Claim
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1. A method for preparing silicone molding tooling of a shaped article, comprising the steps of:
- providing a curable silicone resin composition having at least two parts that, upon mixing, cure to form a silicone rubber;
mixing the parts of the silicone resin composition to form an uncured silicone rubber having a viscosity between about one million centipoise and about four million centipoise and having the ability to hang on a vertical surface in a layer of about 0.2 cm thickness without significant slumping, said mixing being accomplished in such a manner that entrainment of air in said uncured silicone rubber is avoided;
spraying the uncured silicone rubber onto a surface to be molded in a single operation with said mixing step, said spraying being done in such a manner that entrainment of air in said uncured silicone rubber is avoided, wherein said layer is at least about 0.1 cm thick; and
allowing said silicone rubber to cure on said surface to form a mold of said surface.
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Abstract
The present invention relates to spraying of high viscosity silicone molding compositions and to cured silicone molds or tools formed by that process that allow for near perfect transfer of detail from a surface to a molded object.
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Citations
13 Claims
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1. A method for preparing silicone molding tooling of a shaped article, comprising the steps of:
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providing a curable silicone resin composition having at least two parts that, upon mixing, cure to form a silicone rubber; mixing the parts of the silicone resin composition to form an uncured silicone rubber having a viscosity between about one million centipoise and about four million centipoise and having the ability to hang on a vertical surface in a layer of about 0.2 cm thickness without significant slumping, said mixing being accomplished in such a manner that entrainment of air in said uncured silicone rubber is avoided; spraying the uncured silicone rubber onto a surface to be molded in a single operation with said mixing step, said spraying being done in such a manner that entrainment of air in said uncured silicone rubber is avoided, wherein said layer is at least about 0.1 cm thick; and allowing said silicone rubber to cure on said surface to form a mold of said surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification