Internal air cooling of tubular plastic film

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

1975-09-05

1980-12-02

Rosenbaum, Mark

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

4253261, B29D 2304

Patent

active

042368847

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.

REFERENCES:
patent: 2612656 (1952-10-01), Lyon
patent: 3280429 (1966-10-01), Haley
patent: 3583034 (1971-06-01), Colombo
patent: 3649143 (1972-03-01), Papesh et al.
patent: 3762853 (1973-10-01), Upmeier
patent: 3898028 (1975-08-01), Upmeier
patent: 3902832 (1975-09-01), Gregory et al.
patent: 3947170 (1976-03-01), Zimmerman

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