초록 ▼

A method of extruding thermoplastic resin by use of an extruder, wherein the thermoplastic resin is continuously passed through a compression moderating type resin feeding-melting section, a resin flow disturbing section and a resin stress relaxing section, and extruded through a die. In an apparatu

A method of extruding thermoplastic resin by use of an extruder, wherein the thermoplastic resin is continuously passed through a compression moderating type resin feeding-melting section, a resin flow disturbing section and a resin stress relaxing section, and extruded through a die. In an apparatus for working this method, a helical screw of the extruder is provided with the resin feeding-melting section, the resin flow disturbing section and a transfer section for relaxing the resin stress.

대표청구항 ▼

A method of extruding thermoplastic resin in a transparent condition through an extruder including a screw and a cylinder, the steps of said method comprising: passing said thermoplastic resin through a feeding-melting section having a compression ratio of 0.5-2; passing said resin through a resin

A method of extruding thermoplastic resin in a transparent condition through an extruder including a screw and a cylinder, the steps of said method comprising: passing said thermoplastic resin through a feeding-melting section having a compression ratio of 0.5-2; passing said resin through a resin flow disturbing section selected by any one of a torpedo, a Dulmage and a ring valve; and thereafter passing said resin through a stress relaxing section including a helical screw having a compression ratio 0.5-2. An apparatus for extruding thermoplastic resin in a transparent condition, comprising: a screw and a cylinder therefor, said screw including: a resin feed-melting secton comprising a helical screw having a compression ratio of 0.5-2; a resin flow disturbing section axially following said feed-melting section, selected by any one of a torpedo, a Dulmage and a ring valve; a transfer section axially following said flow disturbing section, comprising a helical screw having a compression ratio of 0.5-2; and a die for extruding said resin transferred from said transfer section in a predetermined shape.