B - Operations – Transporting – 05 – C
Patent
B - Operations, Transporting
05
C
32/46, 103/76
B05C 11/10 (2006.01) B05B 7/00 (2006.01) B05B 7/16 (2006.01) B05B 12/10 (2006.01) B29C 44/60 (2006.01) C09J 5/08 (2006.01)
Patent
CA 1195490
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.
409769
Corporation Nordson
Macrae & Co.
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