may rotate about pivot 79 so that the blade 62 may contact the anvil 64 evenly and with uniform pressure along its length the blade 62 and anvil 64 make a fusion like incision through overlapping layers of a plastic web that is the edges of the overlapping layers of webs defining the incision are lightly bonded together the cutter 60 is also adjustable in that the screw 80 and lock nuts 86 may be repositioned relative to each other to vary the pressure exerted by the blade 62 on the anvil 64 when the cutter is locked into a clamped position as shown in fig3 and 7 the apparatus of the invention also includes a pressure sensitive tape having biocidal or microbicidal qualities in fig3 a strip of double sided tape 214 is shown in fig7 upper and lower strips of single sided tape 216 218 respectively are shown in the preferred embodiment the tape 214 216 218 comprises a carrier film of polypropylene coated with a pressure sensitive adhesive such as an acrylic resin copolymer emulsion which is inherently tacky mixed with a microbicidal agent such as proxel gxl 34 proxel 34 is a registered trademark of imperial chemical industries ltd london england proxel gxl is an aqueous solution of 1 2 benzisothiazolin 3 one a well known acrylic resin copolymer emulsion.