DUAL CHAMBER FILM APPLICATOR WITH IN-POND OVERFLOW

• Main Authors: JAMES R. BURNS, REX A. BECKER, ALFRED C. LI
• Format: Patent
• Language: English
• Published: 31.10.2007
• Subjects: APPARATUS FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL; APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL; IMPREGNATING OR COATING OF PAPER; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PERFORMING OPERATIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PULP COMPOSITIONS; SPRAYING OR ATOMISING IN GENERAL; TEXTILES; TRANSPORTING; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G

AN APPLICATOR HEAD IS POSITIONED BENEATH A BACKING ROLL AND HAS A HOUSING DIVIDED INTO THREE SECTIONS. A FIRST COATING POND IS DEFINED BETWEEN AN OVERFLOW BARRIER AND A FIRST WALL. A CONVERGING PLATE EXTENDS BETWEEN THE FIRST WALL AND A SECOND WALL, AND CONVERGES TOWARD THE SUBSTRATE, AND A SECOND POND IS DEFINED BETWEEN THE PLATE AND AN END WALL. COATING IS INTRODUCED TO BOTH PONDS. A LOW PRESSURE CAVITY IS DEFINED BENEATH THE CONVERGING PLATE AND BETWEEN THE FIRST WALL AND THE SECOND WALL. THE CAVITY OPENS TO THE SECOND POND, AND DRAWS AIR AND EXCESS COATING FROM THE SECOND POND. THE SUBSTRATE IS PREWETTED AS IT PASSES THROUGH THE FIRST POND, AND COATING DEPRIVED OF ENTRAINED AIR IS APPLIED TO THE SUBSTRATE IN THE SECOND POND. COAT WEIGHT UNIFORMITY AND INCREASED MACHINE SPEEDS ARE THUS ACHIEVABLE.