Plastic article or earthenware shaping or treating: apparatus – Shaping orifice and downstream work contacting gaseous...
Patent
1996-05-28
1997-12-23
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Shaping orifice and downstream work contacting gaseous...
4253261, 425392, 425445, B29C 4790
Patent
active
057004897
ABSTRACT:
An external stabilizer employed in a plastic film blowing apparatus incorporates one or more extruded members that carry a low-friction plastic wear cover. A tubular die, fed with a supply of molten thermoplastic polymer, extrudes a tube of the molten polymer and injects air into said extruded tube to inflate the tube into a bubble. The wall of the tube expands into a film of a desired thickness; and the tube is drawn vertically upward and collapsed and flattened. The external stabilizer is positioned on a frame surrounding the extruded tube above the die to keep the tube aligned on a predetermined path as the tube is drawn upwards. The stabilizer includes at least one extrusion of a light-weight material having a profile that is rounded on a side that faces the extruded tube so that said extrusion has a rounded front surface. The associated wear cover is made of a wear resistant plastic material and is disposed on said rounded front surface of said extrusion. In one possible embodiment, the stabilizer comprises a plurality of banks of curved arms. In another embodiment, the stabilizer is formed as an extruded helix. The extrusion can be aluminum and with a mushroom-shaped cross section. Preferably, the extrusion has a hollow core and is fitted with piping for fluid cooling.
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Pearl Technologies, Inc.
Schwartz Iurie A.
Woo Jay H.
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