Tacky mat stack

Claim 2

The mat stack of claim 2 wherein the film of plastic has a thickness less than 0.01 inch.

Claim 3

The mat stack of claim 1 wherein the fibrous web exhibits an open, gauze-like network facilitating penetration of the adhesive coating therethrough into secure engagement with the support film.

Claim 4

The mat stack of claim 1 wherein the fibrous web is embedded in the pressure-sensitive adhesive coating and secured to the film by said coating.

Claim 5

The mat stack of claim 1 wherein a portion of the tread surface is provided with a gripping member engaging one edge of the sheet, said member being in confronting relationship with the barrier surface of an overlying sheet to provide constant nonadhering contact therebetween at said one edge while facilitating initial separation of the overlying sheet from the stack.

Claim 6

In a tacky mat stack suited for the passage of pedestrian traffic thereacross and the concurrent adhesive removal of dirt particles from said traffic by the tread surface on the uppermost sheet of said stack, the improvement in a plurality of superimposed tacky mat sheets having upwardly facing tread surfaces wherein a portion of the upwardly facing tread surface of each sheet is provided with a pull tab having a gripping portion extending freely from the sheet, each overlying sheet being provided with an integral non-delaminating adhesive barrier extending across essentially the full sheet in confronting arrangement with the upwardly facing adhesive tread surface of the underlying sheet and with said pull tab, said tab extending from the edge of the sheet and cooperating with said confronting barrier to provide constant nonadhesive contAct between superimposed sheets at said edge portion, said gripping portion being interposed between the pull tab and the barrier for exposure upon removal of the overlying sheet.

Claim 7

The tacky mat stack of claim 7 wherein the sheets are generally rectangular planar members and the pull tab is a plastic film of high tear strength positioned at one corner thereof to prevent adhesion between adjacent sheets at said one corner.

Claim 8

The mat stack of claim 7 wherein the pull tab is a polyester film of about 1 mil thickness.

Claim 9

In a tacky mat stack suited for the passage of pedestrian traffic thereacross and the concurrent adhesive removal of dirt particles from said traffic by the tread surface on the uppermost sheet of said stack, the improvement in a plurality of superimposed tacky mat sheets of composite laminar construction wherein each superimposed sheet is comprised of a flexible support film having an integral adhesive-impermeable barrier surface extending across essentially the full underside thereof and a pressure-sensitive adhesive coating carried on the top side of said support film and forming an upwardly facing pressure-sensitive adhesive tread surface of the sheet, said coating being in secure non-delaminating engagement with said support film to provide said composite laminar structure, said barrier surface preventing penetration therethrough of the adhesive tread carried by an underlying sheet and consequent adhesive welding of superimposed sheets during the passage of pedestrian traffic across the stack, said barrier surface facilitating easy separation of each topmost sheet after passage of pedestrian traffic thereon while preventing inadvertent relative movement between the superimposed sheets of the stack.

Claim 10

The tacky mat stack of claim 10 wherein the flexible support film is a thin solid plastic sheet and the barrier surface of said film is disposed in overlying confronting relationship with the pressure-sensitive adhesive of an underlying sheet and is releasably held thereby to prevent relative movement therebetween while facilitating peelable separation thereof.

Claim 11

The mat stack of claim 10 wherein one edge of the sheet is provided with gripping means in confronting relationship with the barrier surface of an overlying sheet to provide constant nonadhering contact therebetween at said one edge while facilitating initial separation of the overlying sheet from the stack.