Internal air cooling of tubular plastic film

Details Internal air cooling of tubular plastic film Internal air cooling of tubular plastic film

B - Operations, Transporting

29

C

18/528, 18/736,

B29C 47/88 (2006.01) B29C 47/20 (2006.01)

Patent

CA 1082417

Abstract A rotary die assembly for extruding plastic tube, having a plurality of discrete cooling air inlet conduits extending through the male member of the die and connected at their inlet ends to circumferentially spaced apart positions to a wall of an annular inlet plenum so as to receive inlet air through the wall; the plenum is located outside of and generally coaxially with the rotating die members, the remaining walls of the plenum being stationary and connected to receive a supply of cooling air; exhaust air from the interior of the extruding tube similarly passes through a number of discrete conduits to a discharge plenum; the conduits are insulated to limit heat transfer between the heated die elements and the flowing air; a transition assembly enables the inner air to be efficiently distributed and the outlet air to be efficiently divided into the flows mentioned.

260573

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