Internal cooling air supply assembly

Details Internal cooling air supply assembly Internal cooling air supply assembly

1995-06-02

1996-11-19

Nguyen, Khanh P.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

425384, 425445, B29C 4788

Patent

active

055760295

ABSTRACT:
An internal cooling air supply assembly has a lower annular member mountable on an annular die so as to be within extruded tubular plastic film as the film leaves the die. An intermediate annular member is positionable above the lower annular member with an air removal chimney extending upwardly therethrough, the intermediate annular member forming a first chamber with the lower annular member and having an annular lower edge spaced from and co-operating with an annular upper edge of the lower annular member to form a first cooling air outlet from the first chamber. The intermediate annular member has a transfer passage for transferring cooling air from the first chamber to the interior of the intermediate annular member. A first upper annular member is positionable above the intermediate annular member with the air removal chimney extending upwardly therethrough, the upper annular member forming a second chamber with the intermediate annular member and having an annular lower edge spaced from and co-operating with an upper annular edge of the intermediate annular member to form a second cooling air outlet from the second chamber. The intermediate annular member has a first series of circumferentially spaced upwardly directed passages extending from the exterior thereof to the upper annular edge thereof.

REFERENCES:
patent: 3898028 (1975-04-01), Upmeier
patent: 4236884 (1980-12-01), Schott, Jr.
patent: 4265853 (1981-05-01), Havens
patent: 4473527 (1984-09-01), Fujisaki et al.
patent: 4601649 (1986-07-01), Upmeier
patent: 4606879 (1986-08-01), Cerisano
patent: 4643657 (1987-02-01), Achelpohl et al.
patent: 4678417 (1987-07-01), Upmeier
patent: 4955802 (1990-09-01), Halter et al.

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