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Method of and apparatus for multi-layer viscous fluid deposition such as for the application of adhesives and the like

  • US 4,476,165 A
  • Filed: 06/07/1982
  • Issued: 10/09/1984
  • Est. Priority Date: 06/07/1982
  • Status: Expired due to Fees
First Claim
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1. A method of multi-layer viscous fluid deposition upon a moving web, that comprises, pumping fluid synchronously with the web speed transversely into intermediate inlet regions on one side of each of a pair of substantially parallel opposed narrow longitudinal slot cavities to expand the fluid longitudinally along each slot cavity laterally of the direction of movement of the web without substantial transverse expansion;

  • projecting the longitudinally expanded fluid in the pair of slot cavities transversely outwardly toward one another and against opposite sides of baffle means that extends laterally of the direction of movement of the web, to divert the fluid to and through a pair of adjacent exit openings spaced along the direction of movement of the web and each displaced on the opposite side of its slot cavity from the inlet region, so that the fluid on opposite sides of the baffle means is directed in zig-zag paths towards one another and through the respective said spaced openings onto the moving web; and

    varying the width of the said openings along the direction of movement of the web to increase or decrease the velocity of the exiting fluid to adjust for the shearing action by the web for fluids of widely different viscosities in order to maintain a continuous and uniform coating deposition, without discontinuity, exiting separately at substantially the same time from both of said openings.

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