Provided is a PSA sheet capable of showing high long-term adhesive strength and good air release properties between the PSA sheet and an adherend. This invention provides a PSA sheet comprising a substrate film and a PSA layer provided to at least one face of the substrate film. The PSA sheet comprises a coating layer partially covering the PSA layer surface, whereby the PSA layer surface has a coating layer-bearing area and a coating layer-free area. The coating layer-free area occupies 70% or more of the PSA layer surface. In a top view of the PSA layer surface, the coating layer-bearing area has a linearly extending part running from one edge to another edge of the PSA layer. The linearly extending part has a width in a range of 0.1 mm to 2 mm.

The aim of the invention is to improve an impairment to the adherence of an adhesive tape to a substrate caused by the inclusion of air bubbles between the adhesive tape and the substrate. According to the invention, said aim is achieved by means of an adhesive tape which comprises at least one adhesive layer, wherein the adhesive layer has at least one groove and none of the grooves extends as far as one of the lateral edges of the adhesive layer. The invention further relates to a release liner having a surface which has at least one ridge, wherein none of the ridges extends as far as one of the lateral edges of the release liner.

The disclosure provides a flexographic printing original plate which comprises an adhesive layer that exhibits excellent solvent resistance and excellent adhesion to a supporting body. The disclosure provides a flexographic printing original plate 10 which sequentially comprises, on a surface of a supporting body 12, an elastic layer 16 and an adhesive layer 14, wherein the supporting body 12 contains a polyester resin and the adhesive layer 14 contains the components (a), (b) and (c) described below. (a) a polyester resin (b) an isocyanate compound (c) a xylene resin which has a melting point or softening point of 100 C. or less.