Film size control apparatus for the blown film process

Details Film size control apparatus for the blown film process Film size control apparatus for the blown film process

1975-04-25

1976-11-09

Husar, Francis S.

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

137 83, 264 95, 425170, 425172, 425503, B29D 2300, B29D 2304, B29D 702

Patent

active

039908240

ABSTRACT:
Apparatus for regulating the flow of refurbishing gas or air internally to tubular film produced by the blown film process, comprising a pair of opposed arm means or arms adapted to physically contact and sense growth or diminishment in the size of the film, as determined by the spacing between the arms, the arms being independently pivotable preferably about a common axis, or alternately parallel axis closely spaced to approximate a common arc of movement, a gas flow regulating valve comprising a pressurized gas line carried by one arm, at which vicinity it is interrupted to define a gap across which the gas stream flows prior to entering the film, a flow blockage valving means comprising preferably a valve plate fixed to the opposite arm, and having changing position in said gap responsive to relative movement between the arms, the valve plate defining an opening of tapered or variable width, which depending on alignment, partially hindered alignment, or non-alignment with the gas stream, increases or lessens the flow rate as required to maintain a control or predetermined film size.

REFERENCES:
patent: 3460436 (1969-08-01), Takeda
patent: 3700370 (1972-10-01), Hearns et al.

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