Felt-based four-side-processing and method for producing said processing material

A felt-based four-sides-processing material having a release paper-attached pressure-sensitive adhesive layer, the felt-based four-sides-processing material comprising:

• a rectangular column-shaped base material comprising a flame-retardant felt material;
• a pressure-sensitive adhesive layer having a pressure-sensitive adhesive region provided continuously or discontinuously on one of flat surfaces of the base material in a longitudinal direction of the flat surface;
• and
• release paper pasted to the pressure-sensitive adhesive layer, wherein
• the base material is a laminate obtained by laminating felt rock wool in a thickness direction, the resulting felt laminate having a thickness in a range from 3 mm to 50 mm and a width in a range from 5 mm to 10 cm and having a rectangular column shape;
• the pressure-sensitive adhesive layer has a configuration such that on the flat surface of the base material directly on which the pressure-sensitive adhesive layer is provided, the pressure-sensitive adhesive region having a pressure-sensitive adhesive and a non-pressure-sensitive adhesive region where the pressure-sensitive adhesive is not present are alternately formed along at least one edge in a longitudinal direction of the flat surface, and a non-pressure-sensitive adhesive region where the pressure-sensitive adhesive is not present is provided, in at least one edge part in a short side direction of the base material, at a part including at least one end part of the edge;
• and
• the release paper has a size equal to a size of the flat surface of the base material.