Method of making a bituminous coated sheet of synthetic mineral wool fibers

Claim 1

A METHOD OF PREPARING A POROUS GLASS FIBER SHEET BASE WHICH IS SATURATED WITH BITUMINOUS MATERIAL COMPRISING THE STEPS OF APPLYING AN EXCESS FO MOLTEN BITUMINOUS MATERIAL BY SUBMERGING IN A MOLTEN BATH THEREOF A POROUS BONDED GLASS FIBER SHEET BASE HAVING A NONTHERMOPLASTIC BINDER TO WHICH THE MOLTEN BITUMINOUS MATERIAL READILY ADHERES, THE BINDER CONSISTING ESSENTIALLY OF THERMOSET RESIN AND COVERING SUBSTANTIALLY THE ENTIRE GLASS FIBER SURFACES AND BEING TIGHTLY BONDED THERETO, WITHDRAWING THE GLASS FIBER SHEET BASE HAVING AN EXCESS OF MOLTEN BITUMINOUS MATERIAL THEREON FROM THE SAID BATH, DOCTORING OFF THE EXCESS MOLTEN BITUMINOUS MATERIAL AFTER REMOVAL OF THE GLASS FIBER SHEET BASE FROM THE SAID BATH BY PASSING IT BETWEEN A PAIR OF ROLLS INCLUDING A FLOATING DOCTOR ROLL WHICH IS PIVOTALLY MOUNTED AT A POINT REMOTE FROM THE AXIS THEREOF, THE SHEET BASE BEING PASSED UNDER AND OVER THE FLOATING DOCTOR ROLL AND THEN AWAY FROM THE UPPER PERIPHERAL SURFACE THEREOF IN A DIRECTION TOWARD THE SAID POINT OF MOUNTING AND IN A PLANE SUBSTANTIALLY PARALLEL TO A PLANE PASSING THROUGH THE AXIS OF THE FLOATING DOCTOR ROLL AND THE SAID POINT OF MOUNTING WHEREBY THE EXCESS MOLTEN BITUMINOUS MATERIAL IS DOCTORED OFF OF THE GLASS FIBER SHEET BASE AT A SUBSTANTIALLY CONSTANT PRESSURE AND POROSITY VISIBLE TO THE UNAIDED EYE IS PRODUCED IN THE RESULTANT SATURATED GLASS FIBER SHEET BASE, THE PERIPHERAL SURFACES OF THE PAIR OF ROLLS BEING ROTATED AT SUBSTANTIALLY THE LINEAR SPEED OF THE GLASS FIBER MAT AS IT PASSES THEREBETWEEN, THE BITUMINOUS MATERIAL THAT REMAINS AFTER DOCTORING OFF THE SAID EXCESS SATURATING THE GLASS FIBER SHEET BASE AND BEING BONDED TO THE NONTHERMOPLASTIC BINDER ON THE GLASS FIBER SURFACES.

Claim 2

A METHOD OF PREPARING A POROUS GLASS FIBER SHEET BASE WHICH IS SATURATED WITH BITUMINOUS MATERIAL COMPRISING THE STEPS OF APPLYING AN EXCESS FO MOLTEN BITUMINOUS MATERIAL BY SUBMERGING IN A MOLTEN BATH THEREOF A POROUS BONDED GLASS FIBER SHEET BASE HAVING A NONTHERMOPLASTIC BINDER TO WHICH THE MOLTEN BITUMINOUS MATERIAL READILY ADHERES, THE BINDER CONSISTING ESSENTIALLY OF THERMOSET RESIN AND COVERING SUBSTANTIALLY THE ENTIRE GLASS FIBER SURFACES AND BEING TIGHTLY BONDED THERETO, WITHDRAWING THE GLASS FIBER SHEET BASE HAVING AN EXCESS OF MOLTEN BITUMINOUS MATERIAL THEREON FROM THE SAID BATH, DOCTORING OFF THE EXCESS MOLTEN BITUMINOUS MATERIAL AFTER REMOVAL OF THE GLASS FIBER SHEET BASE FROM THE SAID BATH BY PASSING IT BETWEEN A PAIR OF ROLLS INCLUDING A FLOATING DOCTOR ROLL WHICH IS PIVOTALLY MOUNTED AT A POINT REMOTE FROM THE AXIS THEREOF, THE SHEET BASE BEING PASSED UNDER AND OVER THE FLOATING DOCTOR ROLL AND THEN AWAY FROM THE UPPER PERIPHERAL SURFACE THEREOF IN A DIRECTION TOWARD THE SAID POINT OF MOUNTING AND IN A PLANE SUBSTANTIALLY PARALLEL TO A PLANE PASSING THROUGH THE AXIS OF THE FLOATING DOCTOR ROLL AND THE SAID POINT OF MOUNTING WHEREBY THE EXCESS MOLTEN BITUMINOUS MATERIAL IS DOCTORED OFF OF THE GLASS FIBER SHEET BASE AT A SUBSTANTIALLY CONSTANT PRESSURE AND POROSITY VISIBLE TO THE UNAIDED EYE IS PRODUCED IN THE RESULTANT SATURATED GLASS FIBER SHEET BASE, THE PERIPHERAL SURFACES OF THE PAIR OF ROLLS BEING ROTATED AT SUBSTANTIALLY THE LINEAR SPEED OF THE GLASS FIBER MAT AS IT PASSES THEREBETWEEN, THE BITUMINOUS MATERIAL THAT REMAINS AFTER DOCTORING OFF THE SAID EXCESS SATURATING THE GLASS FIBER SHEET BASE AND BEING BONDED TO THE NONTHERMOPLASTIC BINDER ON THE GLASS FIBER SURFACES.