Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – To produce composite – plural part or multilayered article
Patent
1982-11-15
1985-10-22
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
To produce composite, plural part or multilayered article
264310, 264311, B29C 504
Patent
active
045487790
ABSTRACT:
A method of rotationally molding a multi-layered article. The outer layer is first rotationally molded and solidified. An inner polymer layer is fed into the mold cavity and an inner layer is rotationally molded to the inner surface of the outer layer. Preferably, the outer layer and inner layer are thermoplastics. The outer layer polymer has a melting point higher than the inner layer polymer. The outer layer is rotationally molded and cooled to below its melt temperature but above the melt temperature of the inner layer polymer. The inner layer is then rotationally molded while the outer layer remains solid.
REFERENCES:
patent: 3202745 (1965-08-01), Ringdal
patent: 3542912 (1970-11-01), Rielly et al.
patent: 3669827 (1972-06-01), Kolyer et al.
patent: 3845163 (1974-10-01), Murch
patent: 3966870 (1976-06-01), Vecchiotti
Lucas Mariann E.
Petruccelli Frank
Steinberg Albert H.
Zlatkevich Lev
Allied Corporation
Anderson Richard A.
Derrington James
Henry Patrick L.
Negin Richard A.
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