Backing plate for adhesive flap wheels

A backing plate for abrasive flap wheels comprising:

• a dome shaped inner part (16) having a central location hole (22) adapted for fastening on a shaft of a driving machine and of an outer flange (18) connected with said inner part (16),
• said outer flange (18) having an annular fixing surface (24) for abrasive flaps (14) to be bonded thereto, said backing plate (12) being circumferentially provided with openings for passage of cooling air,
• wherein said openings are configured as slots (26), which are formed in the outer flange (18) and which are radially open on an outer edge (28) of the outer flange (18), and
• wherein the slots (26) are delimited by a plane baffle surface (30) on an edge of the slots upstream with respect to a rotation sense (u) of the backing plate (12), said baffle surface forming a right angle with said annular fixing surface (24) of the outer flange (18), wherein, opposite to said baffle surface, a curved deflection wall (32) is formed.