Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1981-10-29
1984-03-06
Anderson, Philip E.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264101, 264DIG13, 425378R, 425817C, B29D 2700
Patent
active
044353456
ABSTRACT:
The density of the foam is reduced and the thickness of the sheet obtained by extrusion/expansion is increased by grasping the sheet between confining walls which are permeable to gas and movable together with the sheet, and which diverge from each other in the direction of advance of the sheet, and by applying a subatmospheric pressure to the faces of the sheet and through the said walls while the sheet is in its thermoplastic state, after which the foam is gelled by cooling to stabilize the thickness achieved.
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Anderson Philip E.
Lavorazione Materie Plastiche L.M.P. S.p.A.
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