Method of and apparatus for tubularly drawing thermoplastic resi

Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Production of continuous or running length

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264146, 264150, 2642902, 425294, 4253021, 425316, 4253261, 4253871, B29C 5528

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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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patent: 4331624 (1982-05-01), Yazawa et al.
patent: 4434128 (1984-02-01), Okada et al.
patent: 4462779 (1984-07-01), Brinkmeier et al.

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