Laminating techniques

Claim 1

A METHOD OF LAMINATING A GLASS-PLASTIC ASSEMBLY COMPRISING ASSEMBLING A DRY SHEET OF POLYVINYL BUTYRAL HAVING A MOISTURE CONTENT OF LESS THAN 2 PARTS PER THOUSAND BY WEIGHT BASED ON POLYVINYL BUTYRAL AND TWO MATCHED SHEETS OF GLASS IN ALIGNED STACKED RELATION TO ONE ANOTHER SO THAT THE SHEET OF POLYVINYL BUTYRAL IS SANDWICHED BETWEEN SAID GLASS SHEETS IN SAID ASSEMNBLY AND BECOMES AN INTERLAYER THEREOF, MAINTAINING SAID SHEET OF POLYVINYL BUTYRAL DRY DURING SAID ASSEMBLY STEP, ENCLOSING THE PERIPHERY AND THE MARGIN ONLY OF THE ASSEMBLY WITH A FLEXIBLE, CHANNELSHAPED MEMBER MADE OF A FLUID IMPERVIOUS MATERIAL TO PLACE THE MEMBER IN ENGAGEMENT WITH A MARGINAL PORTION OF THE OUTER SURFACES OF THE ASSEMBLY AND IN SPACED RELATION TO AT LEAST PART OF THE PERIPHERY OF THE ASSEMBLY TO PROVIDE A CONDUIT ADJACENT THE PERIPHERY OF THE INTERFACES BETWEEN THE INTERLAYER AND THE GLASS SHEETS, EVACUATING AIR FROM THE CONDUIT THROUGH THE MEMBER TO REMOVE AIR FROM BETWEEN THE INTERLAYR AND THE GLASS SHEETS, AND HEATING THE ASSEMBLY AND THE MATERIAL ENCLOSING IT TO AN ELEVATED TEMPERATURE WHILE SUBJECTING SAID ASSEMBLY AND SAID ENCLOSING MATERIAL TO A MAXIMUM PRESSURE SUBSTANTIALLY EQUAL TO ATMOSPHERIC PRESSURE TO BOND THE INTERLAYER TO EACH GLASS SHEET WHILE CONTINUING TO EVACUATE AIR FROM SAID CONDUIT UNTIL THE LAMINATE SO PRODUCED IS CAPABLE OF MEETING THE REQUIREMENTS OF THE AMERICAN STANDARDS ASSOCIATION CODE FOR SAFETY GLAZING MATERIALS Z-26.1-1950, WITHOUT REQUIRING ANY FURTHER TREATMENT AT SUPERATMOSPHERIC PRESSURE.