Plastic article or earthenware shaping or treating: apparatus – Shaping orifice and downstream work contacting gaseous...
Patent
1986-12-30
1988-03-01
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
Shaping orifice and downstream work contacting gaseous...
239523, 239DIG7, 264569, 425 72S, 4253261, 425327, 4253871, B29C 5318, B29C 5320
Patent
active
047282770
ABSTRACT:
The invention provides an air operated film-handling or stabilizing device that can be used with most thin flexible films or webs, such as plastics, paper, thin metal, etc. The configuration of the device depends upon the shape of the sheet and, for example, is flat for flat sheets and ring-shaped for use in blown plastics film production to surround the blown bubble. The device provides two opposite orifices which discharge respective streams of air in opposite directions over respective surfaces which are parallel to the face of the film to be handled and/or stabilized. A third surface is disposed between the two orifices also parallel to the film face, but spaced further from it than the two first-mentioned faces, resulting in a zone of lower air pressure that urges the film toward the third surface, but without the possibility of touching it, or the other two surfaces, so that the film is held by the force in a stable location relative to the device. In developments the air streams may be heated or cooled, and additional air streams may be provided for additional cooling. Since the film is engaged only by air streams, it can be used with newly extruded materials while they are still molten or semi-molten, as well as with solid materials. The device may also be used, for example, as the film engaging part of a bubble sizing cage or collapsing frame.
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