Bubble stabilizer and sizing cage with wear strips

Details Bubble stabilizer and sizing cage with wear strips Bubble stabilizer and sizing cage with wear strips

1997-09-02

1999-08-24

Pyon, Harold

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

2642094, 264565, 4253261, 425384, 4253871, 425392, B29C 4790

Patent

active

059422564

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 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.

REFERENCES:
patent: 3749540 (1973-07-01), Upmeier
patent: 4355966 (1982-10-01), Sweeney et al.
patent: 4388061 (1983-06-01), Bebok
patent: 4408970 (1983-10-01), Bustin et al.
patent: 4717323 (1988-01-01), Karl et al.
patent: 4749346 (1988-06-01), Planeta
patent: 4943226 (1990-07-01), Pottorff
patent: 5700489 (1997-12-01), Pottorff

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