초록 ▼

An apparatus are described for extruding a soft, low density elastomeric thermoplastic foam. A single screw extruder having a very large screw length to diameter ratio is provided to thoroughly mix the thermoplastic elastomer with a blowing agent. A thin, substantially taperless die is also provided

An apparatus are described for extruding a soft, low density elastomeric thermoplastic foam. A single screw extruder having a very large screw length to diameter ratio is provided to thoroughly mix the thermoplastic elastomer with a blowing agent. A thin, substantially taperless die is also provided to form extruded profiles. By using such an apparatus, a variety of complex-shaped extruded profiles may be easily produced.

대표청구항 ▼

[ We claim:] [1.] Apparatus for extruding elastomeric thermoplastic foam comprising:a barrel having a hollow opening defined therein;a screw disposed within said barrel, said screw having a transition region for melting resin, a mixing region disposed downstream of said transition region for mixing

[ We claim:] [1.] Apparatus for extruding elastomeric thermoplastic foam comprising:a barrel having a hollow opening defined therein;a screw disposed within said barrel, said screw having a transition region for melting resin, a mixing region disposed downstream of said transition region for mixing a blowing agent with said resin, and a metering region for cooling said resin, said metering region having an L/D ratio of at least 32:1;a heating element coupled with said screw in said transition region for heating said resin;an injector coupled with said screw in said mixing region for injecting a blowing agent;a cooling element coupled with said screw in said metering region for cooling said mixture of resin and blowing agent; anda die disposed at an end of said screw for extruding said resin into a foam.