Hot melt adhesive system

Dispensing – With material treatment or conditioning means

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Details

1374625, 137504, 137538, 239124, F04C 1504

Patent

active

045359199

ABSTRACT:
A hot melt foam adhesive system including a gear pump wherein gas is mixed under pressure into the molten adhesive and is driven into solution with the adhesive. The adhesive/gas solution is supplied at a relatively high pressure to a valved dispenser or gun from where it is dispensed onto a substrate. As the adhesive/gas solution emerges from the dispenser, the gas comes out of solution but remains entrapped in the adhesive, thereby forming an adhesive foam. The system includes a recycle flow line or hose for returning adhesive/gas solution from the dispenser to the pump. Within this recycle flow line there is a pressure regulator responsive to flow changes or viscosity changes of the adhesive/gas solution for maintaining a fixed back pressure in the system, thereby enabling the system to maintain a fixed and uniform flow rate from the dispenser during all operating conditions of the dispenser.

REFERENCES:
patent: 2011333 (1935-08-01), Clifton
patent: 2616445 (1952-11-01), Gaddoni
patent: 3806037 (1974-04-01), Loewenkamp
patent: 3892339 (1975-07-01), Idler
patent: 4059466 (1977-11-01), Scholl et al.
patent: 4059714 (1977-11-01), Scholl et al.
patent: 4200207 (1980-04-01), Akers et al.
patent: 4237922 (1980-12-01), Maier

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