| 摘要 |
PURPOSE:To easily produce a frictional force reinforcing material in great quantity by a method wherein covering material as stock is applied onto separable synthetic resin base material and, before the covering material layer solidifies, fine pieces of high hardness sub stance are sprinkled over the covering material layer and, after that, the covering material as stock is again applied so as to cover the fine pieces and, after the solidification of the covering material, the synthetic resin base material is removed and the covering material is ground. CONSTITUTION:Synthetic resin base material 1 has properties, which is separable and hard to adhere to covering material 2 and made of non-rigid polyethylene, teflon or the like and formed in a shape of film, plate or paper. Covering material layer 2a is produced by applying liquefied covering material as stock onto the synthetic resin base material 1. Before the covering material layer 2a solidifies, a large number of fine pieces of high hardness substance are sprinkled from above. Further, the same covering material as stock as mentioned above is again and thinly applied on the covering material layer 2a sprinkled with the fine fine pieces 3 so as to cover the fine pieces 3 by the covering material layers 2a and 2b. After the solidification of the covering material layers 2a and 2b, the synthetic resin base material 1 is separated from the layers. After that, the covering material 2 formed in plate is ground so as to obtain pellet-like frictional force reinforcing materials 4. |
