Permanent attachment pressure sensitive adhesive tape

Claim 1

A PAPER-BACKED, NORMALLY TACKY AND PRESSURE-SENSITIVE ADHESIVE TAPE HAVING IMPROVED DELAMINATION RESISTANCE, AND CAPABLE OF BEING UNWOUND IN ROLL FORM WITHOUT SPLITING, CONSISTING ESSENTIALLY OF A NON-UNIFIED PAPER SHEET HAVING A DELAMINATION RESISTANCE OF AT LEAST 15 OZ/IN. WIDTH AND NOT ABOVE ABOUT 30 OZ/IN. WIDTH AND HAVING ON ONE SIDE A COATING OF A NORMALLY TACKY AND PRESSURE-SENSITIVE ADHESIVE GIVING AN ADHESIVE TO STEEL OF AT LEAST ABOUT 10 OZ/IN. WIDTH, AND HAVING ON THE THE SIDE OPPOSITE THE ADHESIVE SIDE, A COATING OF A RELEASE AGENT WHICH POSSESSES RELEASE PROPERTIES WITH RESPECT TO SAID ADHESIVE WHEREBY SAID TAPE IN ROLL FORM HAS AN UNWIND ADHESION LESS THAN 20 OZ/IN. WIDTH AT AN UNWIND SPEED OF 150''/MIN., SAID NON-UNFIED PAPER SHEET BEING FORMED FROM A CELLULOSIC FUIBROUS PAPER WEB HAVING AND ELONGATED WEB BODY, AND TWO OPPOSED WEB FACES, BY (1) SUBJECTING SAID PAPER WEB, WHIL PLASTICZIED WITH MOISTURE AND HEATED TO A TEMPERATURE SUFFICIENT TO GENERATE MOISTURE VAPOR, SIMULTANEOUSLY TO (A) SUFFICIENT CONFINING PRESSURE, ACTING PREPENDICULARLY WITH RESPECT TO SAID WEB FACES, TO PREVENT SUBSTENTIAL CRINKLING OF THE WEB BODY, AND (B) SUFFICIENT COMPACTING FORCE, ACTING LONGITUDINALLY WITH RESPECT TO THE LENGTH OF SAID WEB AND IN A DIRECTION PARALLEL TO SAID WEB FACES (I) TO CAUSE THE WEB FIBERS TO BE LONGITUDINALLY DISTORTED AND FORCED CLOSER TOGETHER IN CHANGED ORIENTATION LENGTHWISE WITHIN THE WEB BODY AND (II) TO CAUSE THE WEB BODY THEREBY TO CONTRACT IN LENGTH BY A SUBSTANTIAL AMOUNT AND (2) DRYING SAID COMPACTED WEB, TO SET THE DISTORTED FIBERS IN THEIR CHANGED ORIENTATION, THE COHESIVE STRENGTH OF SAID COMPACTED BACKING BEING (A) GREATER THAN THE ADHESION OF THE ADHESIVE LAYER TO THE RELEASE COATING, AND (B) LESS THAN THE ADHESION OF THE ADHESIVE LAYER TO A SMOOTH STEEL SURFACE AND TO THE SURFACE OF THE COMPACED BACKING ON WHICH THE ADHESIVE IS COATED.