Claims
- 1. A method of making a composite rubber mold comprising the steps of:
- (a) spraying a silicone rubber compound on the surface of a master which is to be copied;
- (b) curing the silicone rubber covering over the master to be copied to form a layer with a thickness of 0.005 to 0.020 inches;
- (c) flame treating the back surface of the silicone rubber layer to make it receptive to bonding with other materials;
- (d) forming a solid non-compressible during molding use flexible polyurethane backing layer on the silicone rubber surface; and
- (e) permitting the composite plural layer mold to cure so that it may be subsequently used to mold articles in the shape of a master in the mold so constructed.
- 2. The molding method of claim 1 wherein the sprayable silicone rubber coating is placed over the master which is to be copied with areas of various thickness for the silicone rubber coating so formed.
- 3. The molding method of claim 1 wherein the silicone rubber compound is applied as plural coats.
CROSS-REFERENCE TO RELATED APPLICATION
This is a continuation of application Ser. No. 644,752, filed Dec. 29, 1975 now abandoned.
US Referenced Citations (6)
Continuations (1)
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Number |
Date |
Country |
Parent |
644752 |
Dec 1975 |
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