Pressure regulator

Details Pressure regulator Pressure regulator

G - Physics

05

D

137/139, 32/46

G05D 16/00 (2006.01)

Patent

CA 1200466

HOT MELT ADHESIVE SYSTEM Abstract of the Disclosure 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 whence 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.

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