Method and apparatus for coating paper

Claim 1

A METHOD OF DOUBLE-WET COATING ONE SIDE OF A CONTINUOUSLY ADVANCING PAPER WEB, WHICH COMPRISES THE STEPS OF MECHANICALLY SPREADING ON ONE SIDE OF SAID WEB A FIRST LAYER OF A LIQUID COATING HAVING A MINIMUM VISCOSITY OF 4000 CENTIPOLES TO FILL IN SURFACE IRREGULARITIES ON SAID WEB AND PRESENT A SMOOTH OUTER SURFACE FOR SAID FIRST LAYER, NEXT APPLYING TO WITHOUT SUBSTANTIALLY INTERMIXING WITH SAID SMOOTHLY SPREAD FIRST LAYER WHILE IT IS WET A SECOND LAYER OF LIQUID COATING HAVING A VISCOSITY OF 100 TO 1500 CENTIPOLES, AND APPLY A JET OF AIR TO SAID COATED WEB TO REMOVE ONLY EXCESS OF SAID SECOND LAYER WHILE IT IS WET AND WITHOUT SUBSTANTIALLY INTERMIXING SAID LAYERS AND TO LEAVE A RESIDUE OF SAID SECOND LAYER WHICH IS OF SUBSTANTIALLY UNIFORM THICKNESS AND WHICH PRESENTS A SMOOTH OUTER SURFACE IRRESPECTIVE OF IRREGULARITIES ON THE ORIGINAL WEB SURFACE.