Duplex packaging material

Claim 1

A PRE-ASSEMBLED, FLEXIBLE DUPLEX PACKAGING MATERIAL WEAKLY BONDED WITHOUT ANY HEAT SEALING FOR THE SUBSEQUENT FORMATION OF BAGS OR THE LIKE HAVING AT LEAST TWO SEPARABLE WALLS, COMPRISING (A) A FIRST PLY OF MATERIAL INTENDED FOR THE EXTERIOR OF THE BAG HAVING A PROPERTY OF NON-STRETCHABILITY SIMILAR TO THAT OF PAPER; (B) A SECOND PLY OF MATERIAL INTENDED FOR THE INTERIOR OF THE BAG HAVING A PROPERTY OF STRETCHABILITY SIMILAR TO THAT OF A FREE THERMOPLASTIC FILM, WHEREBY SAID SECOND PLY IS SUBSTANTIALLY MORE STRETCHABLE THAN SAID FIRST PLY; (C) SAID FIRST AND SECOND PLIES BEING PERMANENTLY HEAT SEALABLE BUT NOT BEING HEAT SEALED TO EACH OTHER; (D) A RELEASABLE BONDING AGENT SUBSTANTIALLY UNIFORMLY JOINING WITH MINIMUM LIMITED ADHESION SAID TWO PLIES IN SUBSTANTIALLY COMPLETE EDGE-TO-EDGE CONTACT BY A TEMPORARY AND WEAK BOND OF SUFFICIENT WEAKNESS TO ACCOMMODATE A COMPLETE AND PERMANENT SEPARATION OF SAID FIRST AND SECOND PLIES; (E) SAID WEAK BOND BEING OF A PREDETERMINED MINIMUM STRENGTH LESS THAN THE WEB STRENGTH OF THE FIRST AND SECOND PLIES IN ORDER THAT THE BOND WILL FAIL, ACCOMMODATING SEPARATION OF THE PLIES, BEFORE EITHER OF THE FIRST AD SECOND PLIES FAILS OR TEARS, AND ALSO BEING OF LESS STRENGTH THAN ANY SUBSEQUENTLY FORMED HEAT SEAL BOND AT A SEAM OR JOINT OF THE BAG OR THE LIKE; (F) SAID TEMPORARY AND WEAK BOND THEREBY MAINTAINING SAID TWO PLIES IN A SUBSTANTIALLY MINIMALLY ADHERED, TEMPORARILY INTEGRAL RELAIONSHIP HAVING SUFFICIENT STABILITY FOR HANDLING; (G) SAID BONDING AGENT ALONG BEING THE SOLE SOURCE OF SAID LIMITED ADHESION OF SAID FIRST AND SECOND PLIES AND BEING APPLIED AS A UNITARY COMPOSITION COATING TO AT LEAST ONE OF THE PLIES; AND (H) SAID BONDING AGENT BEING NON-TACKY UNLESS HEATED.