Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Production of continuous or running length
Patent
1988-08-31
1989-09-26
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Production of continuous or running length
264146, 264150, 2642902, 425294, 4253021, 425316, 4253261, 4253871, B29C 5528
Patent
active
048698636
ABSTRACT:
The present invention relates to a method and an apparatus for tubularly drawing a tubular raw material of thermoplastic resin. Gas for forming a bubble to heatingly draw the tubular raw material is injected into the raw material from a direction opposite to a direction for transferring the raw material through a nozzle. The raw material is cut into a plurality of web-like pieces by cutting blades provided on pinch rolls for taking up the raw material. One of the web-like pieces thus cut is separated from the others and formed with an opening into which the nozzle is inserted to inject the gas.
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Iwai Teruyuki
Sasaki Yoshinori
Takai Yasuo
Takashige Masao
Takeichi Hidenobu
Idemitsu Petrochemical Co. Ltd.
Thurlow Jeffery
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