B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/643
B29D 27/00 (1980.01)
Patent
CA 1172409
ABSTRACT OF THE DISCLOSURE: The invention relates to an improvement in a process for obtaining cellular materials comprising unsa- turated polyester resins or unsaturated polyester resins containing reinforcing fibers having a length less than 3 mm, and having a density between 0.2 and 1.0 kg/l, by molding a pre-formed liquid foam in a mold made of two half-molds cooperating to close together to mold the pre- formed foam, said pre-formed liquid foam being obtained upstream of said molding by mechanical introduction of gas by means of a turbine mixer into said unsaturated polyester resins or unsaturated polyester resins containing reinfor- cing fibers, wherein said pre-formed liquid foam is introduced into an open half-mold of said mold or an open half-mold of said mold containing further reinforcing fibers in an amount having a volume greater than the free volume of the mold when closed, the volume of the liquid foam being selected so as to achieve upon subsequent closure of the mold a pressure therein between 2 and 11 absolute atmospheres, then closing the mold by the other said half-mold so as to create said pressure within the mold, and subsequently cross-linking the resin within the mold under said pressure conditions.
382169
Carignani Giancarlo
Cipriani Aldo
Mazzola Massimo
Robic Robic & Associes/associates
Snia Viscosa Societa Nazionale Industria Applicazioni Viscosa S.
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