Plastic injector with heat control

Details Plastic injector with heat control Plastic injector with heat control

1983-11-02

1985-10-22

Rolla, Joseph J.

Dispensing

With heating or cooling means

Cooling only

2221462, 2221465, 165 65, 165 30, 219422, 425550, 425143, B67D 562

Patent

active

045483418

ABSTRACT:
In a plastic injection apparatus comprising a barrel, an axially reciprocable, rotatable, plastic working screw in the bore of the barrel, a nozzle for injecting melted plastic from out of the front of the bore into a mold, and a plurality of axially spaced heater bands ringing the barrel over its length, the heat control for such apparatus is improved by subdividing the barrel into rear and front parts, impeding outward flow of heat from the rear part by the use of thermal insulating material and a heat reflective surface, and promoting outward flow of heat from the front part by the use of cooling means and of a tubular barrel cover which encloses such front part and has inner and outer surfaces which are heat absorptive and heat reflective, respectively. In one embodiment, the mentioned thermal insulating material is incorporated in a tubular insulating shroud enclosing the heater bands in the rear part and of greater I.D. than the O.D. of such bands. In another embodiment, such thermal insulating material is incorporated in a plurality of heat insulating jackets individually sheathing the outer surfaces of the heater bands in the rear part.

REFERENCES:
patent: 2721729 (1955-10-01), Van Riper
patent: 3758001 (1973-09-01), Callan
patent: 4183448 (1980-01-01), Nash
patent: 4197070 (1980-04-01), Koschmann
patent: 4419309 (1983-12-01), Krutchen
Plastics Machinery and Equipment, Feb. 1982, pp. 23 and 24, Jul. 1982, pp. 12-14.

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