To increase a throughput by maintaining, for a long time, the cutting performance of a blade for cutting a wide plate sheet in a tape shape having a specified narrow width, the plate sheet being used for manufacturing various industrial tapes including a tape for grinding, polishing, precision finishing or cleaning, a magnetic tape, a video tape, an acoustic tape, and so on.

The manufacturing method of a plate sheet used for manufacturing an industrial tape includes the steps of uniformly coating a slurry 12 mixing solid particles and binder adhesive on at least one surface of a flexible board sheet 11, forming at least one belt-like blank part 13 having a specified width and a slurry eliminated in a specified position on the surface of the board sheet 11, and drying the slurry on the surface of the board sheet 11.