Spreading head, particularly for thermoplastic material

Details Spreading head, particularly for thermoplastic material Spreading head, particularly for thermoplastic material

2006-01-10

2006-01-10

Keasel, Eric (Department: 3754)

Dispensing

Automatic control

Constant weight, volume or pressure control by output

C222S146200

Reexamination Certificate

active

06983860

ABSTRACT:
A thermoplastic material spreading head including: a valve having a movable needle and a needle cup; a first duct for feeding fluid thermoplastic material to the valve; a second duct, connected in fluid communication to cup; the needle being movable in the body between an open position allowing passage of thermoplastic material flow from the first duct to the second duct, and a closed position in which the needle interferes with the cup to arrest the thermoplastic material flow; an actuating and detecting intake for selective positioning of the needle, for injection in the intake of a pressurized actuation fluid adapted to move the needle at least to the open position; and a pressure sensor arranged on the intake to sense the pressure of the pressurized actuation fluid and provide a confirmation of the position of the needle at least in the open condition.

REFERENCES:
patent: 4662540 (1987-05-01), Schroter
patent: 4678100 (1987-07-01), Gelinas et al.
patent: 4842162 (1989-06-01), Merkel
patent: 4907741 (1990-03-01), McIntyre
patent: 4922852 (1990-05-01), Price
patent: 4987854 (1991-01-01), Hall
patent: 5312016 (1994-05-01), Brennan et al.
patent: 5782410 (1998-07-01), Weston
patent: 6060125 (2000-05-01), Fujii
patent: 0 850 694 (1998-07-01), None

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