| 摘要 |
PROBLEM TO BE SOLVED: To obtain a fine pressure sensitive adhesive sheet easy in manufacturing by making a release paper having many inverted quadrangular pyramid like fine recessed parts slantingly located on the releasing surface of the belt like base paper. SOLUTION: The release paper 1 is obtained by embossing the belt like base paper having releasing processed surface C by an embossing roll having many quadrangular pyramid like fine projecting parts on the surface to form many inverted quadrangular pyramid like fine recessed parts 2 arranged slantingly to the longitudinal direction L of the base paper in tilt angleθof 30 deg.<=θ<=60 deg. and setting the releasing surface to have the quadrangular pyramid like fine recessed parts having length A of one side of the bottom of 0.1 mm<=A<=2 mm, the depth H of the recessed part 2 of 0.003 mm<=H<=0.1 mm and the space W between adjacent fine recessed parts 2 of 0.02<=W<=2 mm. The pressure sensitive adhesive sheet is obtained by applying the pressure sensitive adhesive on the releasing processed face C of the releasing paper 1, filling the adhesive in the fine recessed part 2 and then tightly laminating the surface sheet body.
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