Apparatus for injecting air or gas into a tubular film bubble

Details Apparatus for injecting air or gas into a tubular film bubble Apparatus for injecting air or gas into a tubular film bubble

1982-05-11

1984-07-31

Thurlow, Jeffery R.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Control means responsive to product weight or dimension

264 403, 264564, 264567, 4253261, 4253871, B29D 724

Patent

active

044627793

ABSTRACT:
To maintain an air or gas bubble forming in a moving tube of plastics material between pairs of squeeze rollers, an air or gas injecting needle is mounted to pivot substantially in a plane containing the centerline of the tube. The needle pierces the tube wall of the bubble when in one rotary position, moves with the tube while pivoting through an arc depending on the depth of needle penetration and is withdrawn from the bubble in a second rotary position.

REFERENCES:
patent: 2750624 (1956-06-01), Coates et al.
patent: 3160687 (1964-12-01), Andrews
patent: 3408903 (1968-11-01), Lepisto et al.
patent: 3456044 (1969-07-01), Pahlke
patent: 3492386 (1970-01-01), Ohmasa et al.
patent: 3499064 (1970-03-01), Tsuboshima et al.
patent: 3555603 (1971-01-01), Haley
patent: 3562377 (1971-02-01), Zetzsche
patent: 4290996 (1981-09-01), Hayashi et al.

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