Plastic article or earthenware shaping or treating: apparatus – Diverse distinct type shaping means – Shaping orifice and either a downstream preform reshaping...
Patent
1983-06-15
1985-08-06
Thurlow, Jeffery
Plastic article or earthenware shaping or treating: apparatus
Diverse distinct type shaping means
Shaping orifice and either a downstream preform reshaping...
264566, 4253871, B29C 1500
Patent
active
045333092
ABSTRACT:
A collapsing frame for collapsing an extruded tube of plastics material to flattened form employs two converging frame members each having a large number of parallel rows of rollers mounted with their axes of rotation transverse to the direction of movement of the tube. Each row consists of a large number of small diameter, short length rollers of low density material mounted closely side-by-side to provide a continuous engagement surface, but freely rotatable independently of one another on the common axle. The rollers are of low friction, high temperature resistance material such as polytetrafluorethylene or nylon. The new frame results in better surface appearance owing to absence of scratches and reduction of wrinkling, and better tracking of the tube through the frame. There is also an unexpected improvement in flatness believed due to better support of the tube. An unexpected increase is possible in the rate of extrusion and speed of movement of the tube, due partly to avoidance of jerking contact of the hot sticky film against the frame, but the increase obtained is not fully explainable by this and it is at present believed there is an increase in cooling of the tube, owing to the high heat exchange and air turbulence provided by the large number of individual spinning rollers.
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