| 摘要 |
The invention relates to a screen plate (10), and method of making a screen plate, for the pressure screening of papermaking stock in pressure screening apparatus. The screen plate includes slots (16) which have been cut therethrough by a machining laser beam focused at the inlet side (20) of the plate, to provide slots with nearly straight walls (32) with minimum taper, and which have a recast layer (42) and which have a "glassy" appearance by reason of the melting and resolidification of the immediate wall surface, to provide a very hard and low friction path for the stock. Wear bars (25) are applied to the plate (10) for coaction with the rotating foils on the screening apparatus, in the form of beads of weld material of high hardness applied directly to the plate. |
