Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1983-07-08
1985-09-24
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
523094, 5230912, 52405, 52631, 264 467, 264 51, 264321, 264DIG4, B29D 2700
Patent
active
045432295
ABSTRACT:
A molded insulating insert of expanded polystyrene has a central section and hingedly connected side sections which are bendable toward each other to bring the insert to a U-shaped configuration for insertion in a building block cavity. The hinges are formed to provide resistance to full ninety degree bending of the side sections so that the insert side sections are inclined slightly outwardly in a free condition. On flexing inwardly and insertion in a block cavity the side sections tend to spring outwardly and frictionally grip the walls of the cavity. Lug-notch connection means frictionally retain the inserts in the U-shaped configuration and prevent dislodgement of sections in the event of hinge rupture. In molding the inserts, a transfer process is employed with the hinges partially formed in a hot mold and thereafter fully formed in a cold mold. The polystyrene is compressed in the hinge area to a higher density for hinge integrity. Density in the hinge area is approximately doubled. Reflective foil is also applied to the inner surfaces of the side sections.
REFERENCES:
patent: 2797443 (1957-07-01), Carlson, Jr.
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patent: 3447199 (1969-06-01), Trimble
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patent: 3851022 (1974-11-01), Passarelli
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Whittington's Dictionary of Plastics by Lloyd R. Whittington, Stamford, Conn., Technomic, .COPYRGT.1968, preface; pp. 59, 60 and 242.
Dictionary of Plastics by J. A. Wordingham and P. Reboul, Feltham, Middlesex, England, Newnes Books, 1968, p. 179.
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