Method of and apparatus for making covered plates of polyurethane in a continuous process

Claim 1

A METHOD OF MAKING A CONTINUOUS PROCESS POLYURETHANE FOAM SHEET MATERIAL COVERED ON OPPOSITE SIDES BY FOILS, WHICH INCLUDES THE STEPS OF: PROVIDING A MOVING ENDLESS CONVEYOR BELT AS SUPPORT FOT EHSHEET MATERIAL TO BE FORMED, SAID CONVEYOR BELT HAVING LATERIAL MARGINAL PORTIONS RESPECTIVELY FEEDING TWO MARGINAL STRIPS OF THIN MATERIAL UPON THE LATERIAL MARGINAL PORTIONS OF SAID CONVEYOR BELT, FEEDING A FIRST THIN COVER FOIL OVER AND PLACING THE SAME ONTO BOTH OF SAID MARGINAL STRIPS, FEEDING A SECOND COVER FOIL IN SUBSTANTIALLY PARRALLEL BUT SAPCED RELATIONSHIP TO AND OVER SAID FIRST COVER FOIL, INTRODUCING FOAMABLE POLYURETHANE MATERIAL BETWEEN SAID FIRST AND SECOND COVER FOILS WHILE CAUSING SAID FOAMABLE MATERIAL TO FOAM SO AS TO HAVE FULLY REACTED BEFORE LEAVING SAID CONVEYOR BELT, AND ALLOWYING EXCESSIVE FOAM MATERIAL BETWEEN SAID COVER FOILS WHILE STILL ON SAID CONVEYOR BELT TO ESCAPE FROM BETWEEN SAID COVER FOILS.

Claim 2

A METHOD OF MAKING A CONTINUOUS PROCESS POLYURETHANE FOAM SHEET MATERIAL COVERED ON OPPOSITE SIDES BY FOILS, WHICH INCLUDES THE STEPS OF: PROVIDING A MOVING ENDLESS CONVEYOR BELT AS SUPPORT FOT EHSHEET MATERIAL TO BE FORMED, SAID CONVEYOR BELT HAVING LATERIAL MARGINAL PORTIONS RESPECTIVELY FEEDING TWO MARGINAL STRIPS OF THIN MATERIAL UPON THE LATERIAL MARGINAL PORTIONS OF SAID CONVEYOR BELT, FEEDING A FIRST THIN COVER FOIL OVER AND PLACING THE SAME ONTO BOTH OF SAID MARGINAL STRIPS, FEEDING A SECOND COVER FOIL IN SUBSTANTIALLY PARRALLEL BUT SAPCED RELATIONSHIP TO AND OVER SAID FIRST COVER FOIL, INTRODUCING FOAMABLE POLYURETHANE MATERIAL BETWEEN SAID FIRST AND SECOND COVER FOILS WHILE CAUSING SAID FOAMABLE MATERIAL TO FOAM SO AS TO HAVE FULLY REACTED BEFORE LEAVING SAID CONVEYOR BELT, AND ALLOWYING EXCESSIVE FOAM MATERIAL BETWEEN SAID COVER FOILS WHILE STILL ON SAID CONVEYOR BELT TO ESCAPE FROM BETWEEN SAID COVER FOILS.

Claim 3

AN APPARATUS FOR MAKING IN A CONTINUOUS PROCESS POLYURETHAN FOAM SHEET MATEIAL COVERED ON OPPOSITE SIDES THEREOF BY FOILS, WHICH INCLUDES: AN ENDLESS MOVABLE CONVEYOR BELT FORMING LOWER SUPPORTING AND FEEDING MEANS FOR A LOWER COVER FOIL INTENDED TO COVER ONE SIDE OF THE FOAM SHEET MATERIAL TO BE PRODUCED, UPPER SUPPORTING MEANS ARRANGED ABOVE AND IN VERTICALLY SPACED RELATIONSHIP TO SAID LOWER SUPPORTING MEANS FOR FEEDING AN UPPER COVER FOIL OVER THE FOAM SHEET MATERIAL TO BE PRODUCED, MEANS ADJACENT THE INCOMING END OF THE UPPER CONVEYOR BELT SECTION FOR DEPOSITING FOAM MATEIAL FROM WHICH SAID SHEET MATERIAL IS TO BE MADE BETWEEN SAID LOWER AND UPPER SUPPORTING MEANS AFTER THE COVER FOILS HAVE BEEN INTRODUCED THEREBETWEEN, AND LATERAL SUPPORTING AND GUIDING MEANS LATERIALLY DEFINING THE SPACE BETWEEN SAID UPPER AND LOWER SUPPORTING MEANS FOR RECEIVING THE FOAM MATERIAL FROM WHICH THE SHEET MATERIAL IS TO BE MADE, SAID LATERIAL SUPPORTING AND GUIDING MEANS BEING SO LOCATED AS TO LPERMITE EXCESSIVE FOAM MATERIAL BETWEEN SAID UPPER AND LOWER SUPPORTING MEANS TO ESCAPE TOWARD THE OUTSIDE.

Claim 4

AN APPARATUS FOR MAKING IN A CONTINUOUS PROCESS POLYURETHAN FOAM SHEET MATEIAL COVERED ON OPPOSITE SIDES THEREOF BY FOILS, WHICH INCLUDES: AN ENDLESS MOVABLE CONVEYOR BELT FORMING LOWER SUPPORTING AND FEEDING MEANS FOR A LOWER COVER FOIL INTENDED TO COVER ONE SIDE OF THE FOAM SHEET MATERIAL TO BE PRODUCED, UPPER SUPPORTING MEANS ARRANGED ABOVE AND IN VERTICALLY SPACED RELATIONSHIP TO SAID LOWER SUPPORTING MEANS FOR FEEDING AN UPPER COVER FOIL OVER THE FOAM SHEET MATERIAL TO BE PRODUCED, MEANS ADJACENT THE INCOMING END OF THE UPPER CONVEYOR BELT SECTION FOR DEPOSITING FOAM MATEIAL FROM WHICH SAID SHEET MATERIAL IS TO BE MADE BETWEEN SAID LOWER AND UPPER SUPPORTING MEANS AFTER THE COVER FOILS HAVE BEEN INTRODUCED THEREBETWEEN, AND LATERAL SUPPORTING AND GUIDING MEANS LATERIALLY DEFINING THE SPACE BETWEEN SAID UPPER AND LOWER SUPPORTING MEANS FOR RECEIVING THE FOAM MATERIAL FROM WHICH THE SHEET MATERIAL IS TO BE MADE, SAID LATERIAL SUPPORTING AND GUIDING MEANS BEING SO LOCATED AS TO LPERMITE EXCESSIVE FOAM MATERIAL BETWEEN SAID UPPER AND LOWER SUPPORTING MEANS TO ESCAPE TOWARD THE OUTSIDE.