Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Differential temperature conditioning
Patent
1982-08-11
1984-04-17
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Differential temperature conditioning
264569, 425 72R, 4253261, B29C 2500
Patent
active
044434006
ABSTRACT:
A method and apparatus for the formation of a continuous web of a tubular thermoplastic film from an extrudate of a thermoplastic polymeric material or resin, wherein the thermoplastic film has a profiled wall contour extending in the direction of the longitudinal axis of the film. The apparatus for forming a profiled tubular thermoplastic film, and the method which is implemented through the intermediary of the apparatus, provides for an annular cooling ring extending about the extrusion die orifice and which incorporates a central aperture through which the extruded plastic material is conveyed while still in a molten or heat-plastified state, and is adapted to direct a uniformly distributed flow of a cooling medium, such as air, against the circumferential surface of the extruded tubular plastic film material. A secondary or bypass flow of the cooling medium is directed from the cooling ring, prior to the primary cooling medium flow against the surface of the extruded material, so as to impinge against one or more peripherally spaced zones on the film in order to impart local cooling to the extruded film material within each such zone, to thereby cause the formation of a thickened film wall section or profile extending in the longitudinal direction of the formed tubular thermoplastic film. In order to control the cooling rate of the cooling ring, the cooling ring incorporates an adjusting device which will vary the extent of the cooling medium flow which is uniformly provided about the periphery of the extruded thermoplastic material and, additionally, includes a metering arrangement which will modify or even completely inhibit the cooling medium flow through the bypass so as to thereby control the extent of the profiling of the film. Both the uniform and local flows of the cooling medium within the cooling ring may be supplied with the cooling medium from a plenum encasing the cooling ring, and which is supplied from a single cooling medium source.
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Gilman M. G.
McKillop A. J.
Mobil Oil Corporation
Powers, Jr. J. F.
Thurlow Jeffery R.
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