Process and apparatus for producing laminated panels

Claim 1

THE PROCESS FOR PRODUCING FOAM-CORED LAMINATES COMPRISING: CONTINUOUSLY ADVANCING A LOWER SERIES OF PANELS OF SHEET MATERIAL ON A LOWER CONVEYOR BELT AND CONTINUOUSLY ADVANCING AT THE SAME RATE THEREOF AN UPPER SERIES OF PANELS OF SHEET MATERIAL BY MEANS OF AN UPPER CONVEYOR BELT, RELEASABLY HOLDING SAID UPPER SERIES OF PANELS TO SAID UPPER CONVEYOR BELT A SPACED PREDETERMINED DISTANCE APART FROM AND SUBSTANTIALLY PARALLEL TO SAID LOWER SERIES OF PANELS, SAID HOLDING BEING ACHIEVED BY APPLYING A VACUUM THROUGH SAID UPPER CONVEYOR BELT THROUGH TO THE TOP SURFACES OF SAID UPPER SERIES OF PANELS, CONTINUOUSLY DEPOSITING A UNIFORM LAYER OF FOAMABLE PLASTIC MATERIAL ONTO SAID LOWER SERIES OF PANELS WHILE ADVANCING SAID UPPER AND LOWER SERIES OF PANELS, AND HEATING SAID FORMABLE MATERIAL SO THAT SAID MATERIAL EXPANDS AND CURES WITHIN THE DEFINITIONAL LIMITS OF THE CAVITY FORMED BY SAID PANELS AND ADHERES THERETO, SAID VACUUM BEING GENERATED BY A MOTOR-DRIVEN VACUUM PUMP SECURED TO SAID UPPER CONVEYOR BELT UPON THE PASSING OF CURRENT PICKUP WHEELS COMMUNICATING THEREWITH ALONG A BUS BAR CARRYING ELECTRICAL ENERGY DURING THE EXPANSION AND CURING OF SAID FOAMABLE MATERIAL.