Apparatus for applying discrete foam coatings
First Claim
1. Apparatus for producing a foam coating for application to a substrate, said apparatus comprising:
- a slot nozzle having an elongated slot outlet through which a foam coating material can be extruded;
valve means for controlling flow of foam material to said slot nozzle;
at least one air slot proximate said slot outlet for impinging at least one air stream onto a foaming coating material exuding from said slot outlet; and
means for starting a flow of air prior to extrusion of foam coating material from said slot outlet.
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Abstract
Apparatus for producing intermittent, discrete patterns of foam coating material, onto discrete substrates or substrate areas, where the patterns have sharp, square leading and trailing edges, as well as side edges. A slot nozzle die has elongated air slots along the slot extrusion opening. Air flow is initiated from both air slots prior to the initiation of the foam flow. Also, the air flow is continued beyond that point in time when the foam flow ceases. The delays between the operations of the air flow and the foam coating flow are on the order of micro seconds. Alternatively, the lead and lag air start and stop times on each side of the foam coating material are different to control the exact disposition of the square cut-on and square cut-off coating edge on the substrate.
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Citations
15 Claims
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1. Apparatus for producing a foam coating for application to a substrate, said apparatus comprising:
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a slot nozzle having an elongated slot outlet through which a foam coating material can be extruded; valve means for controlling flow of foam material to said slot nozzle; at least one air slot proximate said slot outlet for impinging at least one air stream onto a foaming coating material exuding from said slot outlet; and means for starting a flow of air prior to extrusion of foam coating material from said slot outlet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification