Apparatus for spraying hot melt adhesives

B - Operations – Transporting – 05 – D

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117/57, 32/60

B05D 1/02 (2006.01) B05B 7/08 (2006.01) B05B 7/12 (2006.01) B05B 7/16 (2006.01)

Patent

CA 1336373

An apparatus for spraying molten thermoplas- tic adhesive in which the outside of a solid stream of adhesive ejected from a nozzle is impacted by atomiz- ing air to form adhesive droplets and the droplets are then directed by pattern-shaping air into a predeter- mined area of a substrate. The flow rate and velocity of the atomizing air and pattern-shaping air is independently controlled by separate regulating valves to permit variation of the size of the adhesive droplets formed and the width of the pattern of droplets deposited on a substrate. Control valves are provided to sequence the flow of adhesive discharged from the nozzle with the flow of atomizing and pat- tern-shaping air such that the flow of atomizing and pattern-shaping air is initiated before the flow of adhesive from the nozzle begins and after the flow of adhesive therefrom is terminated.

604264

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