Process for manufacturing moulded articles made of plastics, cellulose or wood pulp and provided with cavities
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Sep 10, 2002
Grant Date -
N/A
app pub date -
Jan 3, 2000
filing date -
Jul 29, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process forms lightweight molded articles by positioning inserts having gas creating substances at set positions on a matrix layer positioned between mold halves. The matrix layer with inserts is pressed into the mold cavity and sandwiched between molding material. The gas forming substances are activated to produce gas and the mold halves partially opened to allow the gas to form gas cavities at the position of the inserts. The matrix may be a film or net with gas creating substances in attached packets. Alternatively, the matrix may be developed with inserts of gas producing substances encapsulated within molding material by co-extrusion or co-injection nozzles.
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