Method and mold for producing sealing plates by injection molding and sealing plates produced accordingly

A sealing plate made of plastic containing reinforcing fibers, said sealing plate comprising:

• a disc-shaped member having
• a plurality of concentric, circumferentially-spaced openings that divide the disc-shaped member into a plurality of radially-spaced rings and a plurality of radially-extending webs, the webs dividing the rings into a plurality of ring sections, each of the plurality of ring sections include upper and lower radial side walls,
• a sealing side which is formed to cooperate with a valve seat, and
• a plurality of weld lines, wherein each of the respective weld lines of the plurality of weld lines extend obliquely to a circumferential tangent of a respective one of the plurality of ring sections, each weld line being penetrated by reinforcing fibers, and each of the plurality of weld lines consist of weld characteristics along first and second regions of the weld line, that differs from weld characteristics along an intermediate region between the first and second regions, wherein the first region is defined by 1-10% of the ring section radial width extending from the upper radial side wall in the direction of the lower radial side wall and the second region is defined by 1-10% of the ring section radial width extending from the lower radial side wall in the direction of the upper radial side wall.