| 摘要 |
A screen assembly for a conventional vibratory screening machine includes an upper fine mesh screen which passes particles below a predetermined size and rejects particles above this size. A second or blinding screen, below the first screen, acts to dislodge particles caught in the mesh of the first screen. A load bearing assembly supports the first and second screens and includes a first support screen coarser than the screens above it, a perforate plastic mesh and a second support screen coarser than the first support screen. The assembly is placed in a heated press which softens the plastic and then bonds the screens together. In a second embodiment of the invention, an undulating screen assembly is bonded to a support which comprises one or more screens of coarser mesh.
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