| 摘要 |
PROBLEM TO BE SOLVED: To provide plastic screens that are low in cost, durable, able to accept and maintain fine scale structures and textures even when subjected to high temperatures of molten polymers in a direct cast film process, and resistant to degradation in a hydroforming process.SOLUTION: Composite forming screens comprise a layer of hard rubber with a Shore hardness HSD of 12-90, preferably 33-90 and most preferably 46-60 and in preferred embodiments, comprise a support layer of plastic or metal bonded to the hard rubber to form a composite. The forming screens may be planar or cylindrical and are provided with a plurality of apertures or through holes and a pattern of fine scale structures. Methods of making the forming screens are also disclosed. |
