Plastic and nonmetallic article shaping or treating: processes – With step of making mold or mold shaping – per se – Utilizing surface to be reproduced as an impression pattern
Patent
1989-01-17
1990-08-07
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
With step of making mold or mold shaping, per se
Utilizing surface to be reproduced as an impression pattern
264DIG55, 425180, B29C 3342
Patent
active
049466372
ABSTRACT:
A method for making reusable mold halves whereby mold aligning perturbations are directly formed in the process. Two mold parts are superimposed, one having a cavity for retaining the mold to be reproduced and the other having cavities for forming the perturbations. A molding compound is introduced into the cavities which, upon hardening, forms a first mold piece including the model and the perturbations. The mold piece is retained within one of the mold parts, turned upside down, and superimposed with another mold part. Molding compound is introduced into the assembly and hardens to form a second mold piece formed with recesses that are complementary to the perturbations. The mold pieces are separated from the mold parts and the model is removed to form two aligning mold halves.
REFERENCES:
patent: 3408436 (1968-10-01), Cubitt
patent: 3846533 (1974-11-01), Carrier
patent: 4824628 (1989-04-01), Curfman
patent: 4834929 (1989-05-01), Dehoff et al.
Jarcho Harold G.
Silbaugh Jan H.
Toupal John E.
Vargot Mathieu
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