Segmented slot die for air spray of fibers
First Claim
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1. Apparatus for intermittent non-contact application of a coating to a substrate, said apparatus comprising:
- a slot nozzle having an extrusion channel and an elongated slot outlet disposed along said channel through which coating material moving through said channel is extruded;
at least one elongated air slot proximate said slot outlet for impinging at least one air stream onto a coating material exuding from said slot outlet to produce a fibrous web of coating material prior to application thereof to a substrate; and
means in said channel extending at least to said slot outlet and for dividing said slot outlet into a plurality of slot outlets from which coating material exudes;
wherein said coating material exuding from each said slot outlet merges into coating material exuding from adjacent slot outlets to form a continuous coating web prior to impingement of air thereon.
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Accused Products
Abstract
A slot die for producing a fibrous web of adhesive material includes a segmented shim having a plurality of fingers in said slat dividing adhesive material into a plurality of adhesive streams. The fingers have tapered ends which are flush with or extend slightly beyond the slot nozzle outlet. Separate material streams emanate from the slot nozzle outlet where they merge and are engaged by air flow producing a fibrous web of adhesive material. The adhesive and air flow are started and stopped at intervals to produce discrete fibrous webs having square, sharp leading and trailing edges.
116 Citations
19 Claims
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1. Apparatus for intermittent non-contact application of a coating to a substrate, said apparatus comprising:
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a slot nozzle having an extrusion channel and an elongated slot outlet disposed along said channel through which coating material moving through said channel is extruded; at least one elongated air slot proximate said slot outlet for impinging at least one air stream onto a coating material exuding from said slot outlet to produce a fibrous web of coating material prior to application thereof to a substrate; and means in said channel extending at least to said slot outlet and for dividing said slot outlet into a plurality of slot outlets from which coating material exudes; wherein said coating material exuding from each said slot outlet merges into coating material exuding from adjacent slot outlets to form a continuous coating web prior to impingement of air thereon. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. Apparatus for intermittently producing uniform adhesive webs for non-contact deposit onto substrates, comprising:
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a slot nozzle die having die faces defining an elongated slot for receiving and passing adhesive material therethrough; said elongated slot terminating in an elongated slot outlet; a shim disposed between said die faces in said slot, said shim having a plurality of elongated projections defining slots therebetween, said projections extending to said elongated slot outlet and defining between them a plurality of slot outlets through which adhesive material is extruded in a plurality of separate streams; wherein said separate streams merge together to form an emanating continuous adhesive web as said streams emerge from said outlets; and means for impinging a flow of air on said continuous adhesive web emanating from said slot nozzle die after said streams merge and prior to deposition on a substrate to produce a fibrous web of adhesive material for deposition on a substrate.
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15. A method of producing a fibrous web of adhesive for non-contact deposition on a substrate comprising the steps of:
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supplying adhesive material to the slot of a slot nozzle die; dividing the adhesive material in said slot into a plurality of extruding streams of material; merging the streams together at the slot outlet to form a curtain of adhesive material; and impinging a flow of air on both sides of said curtain to produce a fibrous adhesive web for non-contact deposition onto a substrate. - View Dependent Claims (16, 17, 18, 19)
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Specification