Tack free edge for pressure sensitive adhesive web

Abstract

The invention relates to a web material comprising a carrier sheet, a continuous pragmatic sheet and an adhesive layer wherein said adhesive layer is between said carrier sheet and said pragmatic sheet, said adhesive layer more strongly adheres to said pragmatic sheet and said pragmatic sheet is narrower than said carrier sheet.

What is claimed is:  
     
         1 . A web material comprising a carrier sheet, a continuous pragmatic sheet and an adhesive layer wherein said adhesive layer is between said carrier sheet and said pragmatic sheet, said adhesive layer more strongly adheres to said pragmatic sheet and said pragmatic sheet is narrower than said carrier sheet.  
     
     
         2 . The web material of  claim 1  wherein said pragmatic sheet is centered on said carrier sheet.  
     
     
         3 . The web material of  claim 2  wherein said carrier sheet is between 0.6 and 10 mm wider on each side than said pragmatic sheet.  
     
     
         4 . The web material of  claim 1  wherein said pragmatic sheet is not centered on said carrier sheet.  
     
     
         5 . The web material of  claim 4  wherein said carrier sheet is between 0.6 and 10 mm wider on one side than said pragmatic sheet.  
     
     
         6 . The web material of  claim 1  wherein said pragmatic sheet has a thickness of between 40 and 75 μm.  
     
     
         7 . The web material of  claim 1  wherein said carrier sheet comprises cellulose fiber paper.  
     
     
         8 . The carrier sheet of  claim 7  wherein said paper has an edge penetration of less than 8 mm.  
     
     
         9 . The web material of  claim 1  wherein said carrier sheet has an optical transmission of less than 20 percent.  
     
     
         10 . The web material of  claim 1  wherein said carrier sheet has a thickness of between 75 and 225 μm.  
     
     
         11 . The web material of  claim 1  wherein said carrier sheet has a tensile strength of greater than 120 MPa.  
     
     
         12 . The web material of  claim 1  wherein said carrier sheet has a resistivity of less than 10 11  ohms/square.  
     
     
         13 . The web material of  claim 1  wherein said carrier sheet has a silicone coating on the side towards the adhesive.  
     
     
         14 . The web material of  claim 1  wherein said adhesive layer further comprises an antistat.  
     
     
         15 . The web material of  claim 1  wherein said adhesive layer is a solvent coated polymer.  
     
     
         16 . The web material of  claim 1  wherein said pragmatic layer comprises oriented polyolefin or oriented polyester polymer.  
     
     
         17 . The web material of  claim 1  wherein said base comprises an oriented polymer having a voided layer and at least one layer comprising titanium dioxide between said voided layer and the surface layer.  
     
     
         18 . The web material of  claim 1  wherein said carrier sheet comprises a cellulose fiber paper and a biaxially oriented polymer sheet.  
     
     
         19 . The web material of  claim 18  wherein said biaxially oriented polymer sheet is below said paper.  
     
     
         20 . The web material of  claim 18  wherein said at least one layer comprising titanium dioxide contains at least 4% by weight of titanium dioxide.  
     
     
         21 . The web material of  claim 1  wherein said carrier sheet has a coefficient of friction between 0.20 and 0.60.  
     
     
         22 . The web material of  claim 1  wherein said carrier sheet comprises an oriented polymer having a voided layer.  
     
     
         23 . The web material of  claim 18  wherein the cellulose fiber paper contains salt.  
     
     
         24 . The web material of  claim 18  wherein the cellulose fiber contains salt between 0.5% and 2% by weight of paper fiber.  
     
     
         25 . The web material of  claim 1  wherein said pragmatic sheet comprises cellulose paper.  
     
     
         26 . The web material of  claim 1  wherein said pragmatic sheet comprises polymer.  
     
     
         27 . The web material of  claim 1  wherein said pragmatic sheet comprises polymer.  
     
     
         28 . The web material of  claim 1  wherein said pragmatic sheet comprises at least one imaging layer.  
     
     
         29 . The web material of  claim 28  wherein said imaging layer comprises silver halide.  
     
     
         30 . The web material of  claim 28  wherein said imaging layer comprises ink jet receiving layer.  
     
     
         31 . The web material of  claim 28  wherein said imaging layer comprises thermal dye receiving layer.  
     
     
         32 . The web material of  claim 28  wherein said imaging layer comprises electrophotographic receiving layer.  
     
     
         33 . The web material of  claim 28  wherein said imaging layer comprises pigment ink.  
     
     
         34 . A method of forming a tack free web comprising providing a web material comprising a carrier sheet, a continuous pragmatic sheet and an adhesive layer wherein said adhesive layer is between said carrier sheet and said pragmatic sheet, said adhesive layer more strongly adheres to said pragmatic sheet, bringing said web material into contact with at least two partial cutters that are adjusted so as to cut said pragmatic sheet and said adhesive layer but not said carrier sheet, stripping the pragmatic sheet and adhesive layer from the area between said partial cutters, bringing the stripped area of said carrier sheet into contact with a carrier cutter to separate said carrier sheet and form a plurality of tack free webs.  
     
     
         35 . The method of forming a tack free web of  claim 34  wherein said pragmatic sheet is centered on said carrier sheet.  
     
     
         36 . The method of forming a tack free web of  claim 35  wherein said carrier sheet is between 0.6 and 10 mm wider on each side than said pragmatic sheet.  
     
     
         37 . The method of forming a tack free web of  claim 34  wherein said pragmatic sheet is not centered on said carrier sheet.  
     
     
         38 . The method of forming a tack free web of  claim 37  wherein said carrier sheet is between 0.6 and 10 mm wider on one side than said pragmatic sheet.  
     
     
         39 . The method of forming a tack free web of  claim 34  wherein said pragmatic sheet has a thickness of between 40 and 75 μm.  
     
     
         40 . The method of forming a tack free web of  claim 34  wherein said carrier sheet has an optical transmission of less than 20 percent.  
     
     
         41 . The method of forming a tack free web of  claim 34  wherein said carrier sheet has a thickness of between 75 and 225 μm.  
     
     
         42 . The method of forming a tack free web of  claim 34  wherein said pragmatic layer comprises oriented polyolefin or oriented polyester polymer.  
     
     
         43 . The method of forming a tack free web of  claim 34  wherein said base comprises an oriented polymer having a voided layer and at least one layer comprising titanium dioxide between said voided layer and the surface layer.  
     
     
         44 . The method of forming a tack free web of  claim 34  wherein said carrier sheet comprises a cellulose fiber paper and a biaxially oriented polymer sheet.  
     
     
         45 . The method of forming a tack free web of  claim 34  wherein said pragmatic sheet comprises polymer.  
     
     
         46 . The method of forming a tack free web of  claim 34  wherein said pragmatic sheet comprises at least one imaging layer.  
     
     
         47 . The method of forming a tack free web of  claim 46  wherein said imaging layer comprises silver halide.