| 摘要 |
A screen includes a backing grid, a plurality of parallel elongated supporting bars, and a plurality of parallel elongated screen bars. The backing grid has a plurality of parallel longitudinal grid parts and a plurality of parallel transverse grid parts connected to the longitudinal grid parts. Each of the supporting bars has a length corresponding to that of a respective one of the transverse grid parts, an outer surface fixed to the respective one of the transverse grid parts, and an inner surface formed with a plurality of parallel and spaced apart grooves. Each of the screen bars is formed integrally with a longitudinal constricted portion mounted on the supporting bars in the grooves, and a longitudinal head portion on one end of the longitudinal constricted portion. Adjacent ones of the screen bars form a longitudinal slot therebetween.
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