Method for making differential durometer faced rolls

Abstract

Abstract AN EMBOSSING ROLL FOR PRODUCING VISUAL PATTERN EFFECTS IS FORMED WITH A COMPOSITE COATING OG SYNTHETIC PLASTIC IN WHICH THE SURFACE LAYER IS OF GREATER RESILIENCE THAN THE INNER LAYER AND HAS A MULTIPLICITY OF CLOSELY SPACED EMBOSSING FORMATIONS THEREIN. THE INNER LAYER IS OF NONUNIFORM DEPTH TO PRODUCE VARIATIONS IN DEPTH OF THE MORE RESILIENT OUTER LAYER AND THEREBY VARIATIONS IN RIGIDITY ABOUT THE SURFACE OF THE EMBOSSING ROLL. AS A RESULT, DISTORTION IN THE SPACING BETWEEN EMBOSSING FORMATIONS OCCURS WHEN SUFFICIENT PRESSURE IS PLACED UPON THE ROLL AT THE NIP DURING THE EMBOSSING OPERATION. THE VARIATIONS IN THICKNESS OF THE INNER LAYER ARE CONVENIENTLY ACCOMPLISHED BY CARVING A SUBSTANTIALLY UNIFORM DEPOSIT OF THE RESIN OF THE INNER LAYER INTO THE DESIRED PATTERN AND THEN DEPOSITING THE OUTER LAYER THEREON. THE PROCEDURE IS MOST DESIRABLY EMPLOYED IN THE MANUFACTURE OF OPTICAL SHEET MATERIALS OF THE TYPE DESCRIBED IN WILLIAM P. ROWLAND, U.S. PAT. 3,357,773.

Inventors

• 👤 J Nauta

Bibliographic Details