Laminate product of crossed stretched tapes having perforations for air permeation and method for preparing the same

Abstract

Abstract A CROSS-LAMINATED PRODUCT OF STRETCHED TAPES HAVING PERFORATIONS FOR AIR PERMEATION IS PREPARED BY WARPING A LARGE NUMBER OF ELONGATED UNIAXIALLY STRETCHED TAPES OF NARROW WIDTH PREPARED FROM A FIBER FORMING POLYMER AT PREDETERMINED DISTANCES FROM ONE TO ANOTHER, LAMINATING THE WARPED TAPES AS A WARP TAPE LAYER AND WEFT TAPE LAYER, SO THAT THE WARP TAPES AND WEFT TAPES MAY BE CROSSED PERPENDICULARLY OR SLANTEDLY, OR LAMINATING TWO TAPE LAYERS TOGETHER, EACH OF WHICH HAS SLANTEDLY ARRANGED TAPES AT PREDETERMINED DISTANCES FROM ONE TO THE OTHER IN THE LONGITUDINAL DIRECTION OF THE TAPE LAYER, SO THAT THE TAPES OF EACH TAPE LAYER MAY BE CROSSED PERPENDICULARLY OR SLANTEDLY, THERMALLY BONDING THE TAPE LAYERS TO EACH OTTHER UNDER A PRESSURE BY PROVIDING AT LEAST ONE FILM LAYER OF A POLYMER HAVING A LOWER MELTING OR SOFTENING TEMPERATURE THAN THAT OF THE TAPES BETWEEN BOTH LAYERS AS AN ADHESIVE BINDER, SUBJECTING THE RESULTING LAMINATE TO SUFFICIENT HEAT, THEREBY TO MELT THE FILM AT PORTIONS SURROUNDED BY CROSSED TAPES, GATHER THE MOLTEN FILM TOWARDD TAPE SIDES AND FROM PERFORATIONS FOR AIR PREMEATION AT PORTIONS SURROUNDED BY CROSSED TAPES. AND A COMPOSITE LAMINATE IS PREPARED BY BONDING ONE LAYER COMPOSED OF LAMINATED PRODUCTT ABOVEMENTIONED, ONTO AT LEAST ONE SURFACE OF A LAYER COMPOSED OF FIBROUS MATERIAL. CLEAVAGE AND FLUFFING OF THE STRETCHED TAPES ARE SUPPRESSED BY THE GATHERED AND SOLIDIFIED FILM OF THE POLYMER, AND ADHESION AT THE CROSSINGS OF THE WARP AND WEFT TAPES IS MUCH INTENSIFIED.

Inventors

• 👤 M Yazawa

Bibliographic Details