| 摘要 |
A screen includes three or four layers of woven metal screen cloth. The coarsest of these layers is a structural layer includes threads which are woven into the cloth with surfaces which are fusible below a temperature at which the other layers of screen cloth are heat affected. These woven threads include each of the threads in the coarse screen cloth with the coated threads being wire with fusible polypropylene or polyethylene coatings. The cloth could alternatively be coated or a fusible grid used between screens instead. A support layer above the structural layer may include a woven metal screen with woven elements which are either coated with fusible material or are solidly of fusible material woven periodically therethrough in at least one direction. A fusible grid could alternatively be employed. Screens are laminated with one or two fine mesh screens heated on the support woven screen cloth with fusible surfaces to locate the fusible material in the finer cloths. The structural layer of woven screen cloth has the fusible surfaces only encapsulating the support layer just above and not the finer screen cloths on the other side of the support layer. |
