Equipment for extruding an expanded polymer sheet or plate
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United States of America Patent
Stats
-
Jan 13, 2004
Grant Date -
Jun 6, 2002
app pub date -
Nov 29, 2001
filing date -
Dec 4, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Equipment for extruding an expanded polymer sheet or plate comprising an apparatus for the gravimetric loading (11) of a certain number of component polymers and/or mineral fillers, an extruding apparatus (17) consisting of a thermally controlled co-rotating twin-screw extruder (20) with a length ratio of at least 1/34 diameters, a loading pump (38) downstream of the extrusion apparatus, a static group (41) for the mixing and thermal conditioning of the mixture pumped, inserted in a thermo-regulated cartridge (42), a stratifier (44, 45) and a flat head (43), wherein, in at least one portion of the extrusion apparatus (17), there is an injection zone (29, 32) into which gas, such as CO.sub.2, coming from a container tank (30, 34), is introduced.
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