B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 49/28 (2006.01) B29C 47/88 (2006.01) B29C 47/92 (2006.01) B29C 49/58 (2006.01)
Patent
CA 2085184
A blowing head is provided for the manufacture of tubular film from thermoplastic synthetic resin. The blowing head includes a supply of molten synthetic resin through an annular extrusion orifice for producing a tube of resin film; ducts for the supply and exhaust of cooling air applied to the interior of the extruded tube; and an external cooling ring surrounding the extruded film provided with air which can be varied in temperature at different points around the periphery of the film. Greater control over the final thickness of the film is achieved through the provision of an external cooling ring in which sections around the periphery of the tubular film can be differentially heated or cooled. A compact design for the external cooling ring includes lamellar guide bodies, electrical heating rods or alternately arranged vortex nozzles radially positioned within the cooling ring which are independently controlled to produce differential temperature gradients around the tubular film. Additional air currents may be provided around the external periphery of the film which are also independently controllable regarding temperature and air flow.
Shapiro Cohen
Windmoller & Holscher
LandOfFree
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