×

Method and device for providing longitudinal and lateral stretch control in laminated webs

  • US 4,610,739 A
  • Filed: 11/02/1984
  • Issued: 09/09/1986
  • Est. Priority Date: 11/02/1984
  • Status: Expired due to Fees
First Claim
Patent Images

1. An apparatus for laminating a moving web of plastic film material to a moving web of paper material to form a moving web of laminated composite, the film material passing through the apparatus in a continuous longitudinally extending web having an upstream portion entering the apparatus and a downstream portion exiting the apparatus;

  • the film material normally being extensibly deformable such that the distance between any two reference points on the film web is stretchably variable prior to lamination;

    the apparatus comprising;

    (a) paper supply unwind roll means for providing a continuous supply of paper to be laminated;

    (b) film supply unwind roll means for providing a continuous supply of film to be laminated;

    (c) laminating nip means, for drawingly engaging said film web and said paper web in parallel touching contact whereby each said web is moved at the same web speed, and for bondingly compressing said film web to said paper web to form a laminated composite;

    (d) film web lateral stretch control means positioned along said film web between said film supply unwind roll means and said laminating nip means for frictionally engaging said film web and for selectively varying the width of the portion of the film web passing therethrough from a first width at a position where the film web enters said lateral stretch control means to a second width at a position where the film web leaves said lateral stretch control means during continuous movement of the film web from said film unwind roll means through said laminating nip;

    (e) film width monitoring means for measuring the width of predetermined portions of said film web at a position downstream from said film web lateral stretch control means and for providing a monitor signal to a signal processing means;

    (f) signal processing means for comparing said monitor signal to a predetermined film width value and providing command signals responsive thereto to said film web lateral stretch control means for imparting a selected amount of lateral deformation to said film web whereby said film web is continuously extensibly adjusted to a predetermined width by said lateral stretch control means.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×