Plastic article or earthenware shaping or treating: apparatus – Shaping orifice and downstream work contacting gaseous...
Patent
1992-02-05
1994-05-10
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
Shaping orifice and downstream work contacting gaseous...
425140, 4253261, 4253871, B29C 5528
Patent
active
053103297
ABSTRACT:
An air shroud device for use in a blown film extrusion line. The blown film extrusion line is of the type which includes a heated extruder for melting and pressurizing a flow of molten plastic resin, an annular die through which the molten resin extrudes and from which it is pulled away along an axis in the form of an expanding bubble, and at least one air cooling ring mechanism defining a plenum surrounding the base of the bubble and having an annular outlet constructed to direct at least one stream of primary cooling air into cooling contact with the base region of the bubble, to flow along the bubble in the direction of film travel, causing the resin to cool as the film expands until a substantially fixed maximum bubble diameter is achieved at a frost line spaced from the annular die. The air shroud device includes an annular air shroud plenum having an annular air outlet, the air shroud device is constructed and arranged to be disposed at a level below the frost line and adjacent to the level of the air cooling ring. The shroud device is coaxial with the film line axis and of relatively large size so that its outlet mechanism is spaced substantially radially outward from the bubble and from the air cooling ring outlet.
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