Dispensing – With heating or cooling means – Heating only
Patent
1988-10-03
1990-09-04
Skaggs, H. Grant
Dispensing
With heating or cooling means
Heating only
222109, 222333, B67D 562
Patent
active
049537555
ABSTRACT:
A device for dispensing molten thermoplastic material comprising a barrel member having an internal melting chamber communicating with an outlet opening through a nozzle, and a sleeve having one end secured at the barrel member and a through opening communicating with the end of the melting chamber opposite the outlet opening. The sleeve is adapted to receive a rod of solid thermoplastic material with one end portion of the rod in the melting chamber and the rod projecting through the sleeve along a predetermined path. The barrel member is heated to melt the end portion of the rod therein, and a drive adapted to be switched between a deactivated state and an activated state is provided for driving the rod of solid thermoplastic material into the melting chamber at a predetermined rate to expel molten thermoplastic material through the nozzle. Upon switching of the drive means from the activated state to the deactivated state the drive moves the rod of solid thermoplastic material a small distance out of the melting chamber to cause molten thermoplastic material in the nozzle to flow toward the melting chamber and restrict movement (i.e., dripping or stringing) of that molten thermoplastic material out of the nozzle.
REFERENCES:
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patent: 3604597 (1971-09-01), Pohl et al.
patent: 3653552 (1972-04-01), Ast
patent: 3854629 (1974-12-01), Blieberger
patent: 4457457 (1984-07-01), Dziki
patent: 4552287 (1985-11-01), Dziki
patent: 4615469 (1986-10-01), Kishi et al.
patent: 4816642 (1989-03-01), Dennison
Huebsch William L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Skaggs H. Grant
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