Method of seaming projection screen material

Claim 1

IN A METHOD OF SEAMING PROJECTION SCREENS OF THE TYPE WHICH COMPRISE A SOMEWHAT RIGID MATERIAL BUT WHICH IS ADAPTED TO BE ROLLED UP ON A S CREEN ROLL AND WHICH IS FURTHER CHARACTERIZED BY HAVING A BACKING FABRIC LAMINATED TO THE REVERSE SIDE OF THE LIGHT PROJECTION SURFACE AND HAVING SPACED PERFORATIONS EXTENDING THROUGH THE BODY OF SAID SCREEN, THE STEPS WHICH COMPRISE DELAMINATING THE FREE EDGES, IN EACH OF TWO SEPARATE ROLLS OF SCREEN, OF THE PROJECTION SCREEN SURFACE MATERIAL AND ITS BACKING FABRIC ALL ALONG THEIR LENGTHS AND TO A NARROW WIDTH, COATING AN EDGE OF ONE OF THE DELAMINATED PARTS OF SAID PROJECTING SCREEN MATERIAL WITH A LIGHT ABSORBENT MATERIAL, INTERLEAVING THE DELAMINATED PORTIONS WHEREBY THE SAID PROJECTION SCREEN SURFACES DIRECTLY OVERLIE EACH OTHER WITH THE COATED EDGE ON THE UNDERSIDE, AND WHEREBY THE DELAMINATED BACKING MATERIALS OVERLIE EACH OTHER THEREBELOW, ADHESIVELY JOINING TOGETHER THE RESULTING INTERLEAVED DELAMINATED PORTIONS, AND THEN SEWING A LINE OF STITCHES THROUGH SAID INTERLEAVED PORTION.