发明名称 |
Process for the production of a continuous sheet of foamed synthetic, thermoplastic polymer by extrusion |
摘要 |
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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申请公布号 |
US4435345(A) |
申请公布日期 |
1984.03.06 |
申请号 |
US19810316383 |
申请日期 |
1981.10.29 |
申请人 |
LAVORAZIONE MATERIE PLASTICHE L.M.P. S.P.A. |
发明人 |
COLOMBO, ROBERTO |
分类号 |
B29B7/00;B01D17/00;B29C44/50;B29C47/00;B29C47/16;B29C47/90;B29C47/92;B29D;B29D23/00;C08J;(IPC1-7):B29D27/00 |
主分类号 |
B29B7/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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