Process for manufacturing a composite foamed synthetic resin bow

Details Process for manufacturing a composite foamed synthetic resin bow Process for manufacturing a composite foamed synthetic resin bow

1973-09-10

1976-07-27

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 467, 264255, 264274, 264328, 273 82R, B29D 2700

Patent

active

039718379

ABSTRACT:
A composite foamed synthetic resin bowling pin is formed by first placing a base support element composed of a disc element and having a central sleeve with a hollow reinforcing tube secured thereto and an annular collar with an outwardly extending transverse flange thereon of lesser diameter than the disc element in one end of an undesired mold cavity. The peripheries of the disc elements and flange are disposed in recesses in the mold cavity wall. A foamable thermosetting resin reaction mixture is cast in the mold cavity and foamed and cured. The resulting assembly is then inserted in second mold of larger diameter and of the size of the final product. A molten thermoplastic resin is then introduced into this second mold cavity to form a thermoplastic shell on the assembly and which shell is interlocked with the collar on the base support element.

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patent: 2487218 (1949-11-01), Brinkmann
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Modern Plastics Encyclopedia, 1970-1971, vol. 47, No. 10A, Sections, "Plastics Properties Chart," Oct. 1970, pp. 782-784.
Bender, Rene J. "Handbook of Foamed Plastics," Libertyville, Ill., Lake Publishing Co., 1965, pp. 137-141.

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