layer the stress concentration zone 123 is disposed between the bonded edge surfaces of carrier tape 6 and the border area of non adhesive layer 14 again the stress concentration zone 123 is formed by the randomly embossed layer 12 only its mechanical tensile strength is the weakest in comparison with the mechanical tearing strength of adhesion portion 122 and the central portion of the cover tape 1 containing the randomly embossed layer 12 and the non adhesive layer 14 table 1 shows a peeling adhesion force test made on a embossed biaxially extended polypropylene adhesive tape having a thickness of 29 micrometers and a width of one inch relative to different adherend materials at different peeling angles table 1______________________________________a fss psc pcc ss psc pcc______________________________________ 90 769 1061 881 895 895 1295120 760 724 683 769 675 901150 616 576 648 630 598 809170 395 485 496 520 469 679180 1090 1024 923 1093 1297 1037______________________________________ the embossed biaxially extended polypropylene adhesive tape used in the aforesaid test is obtained from a embossed biaxially extended polypropylene film having one side coated with a pressure sensitive layer of acrylic adhesive having a thickness of 20 micrometers and a width of one inch in table 1 a peeling angle degree f adhesion force grams ss stainless steel sheet psc polystyrene plate blended with conductive carbon black pcc polycarbonate plate blended with conductive carbon black in another example the embossed biaxially extended polypropylene tape having a width of one inch and a thickness of 29 micrometers is laminated with a biaxially extended polyester film on the adhesive coated side in the middle which has a width of 0 5 inch and a thickness of 25.