| 摘要 |
PURPOSE:To obtain a sheet uniform in patterns and having no elimination of the patterns due to abrasion by a method wherein mark compound, heated and kneaded while consisting of same qualitied materials, is joined forcibly with the heating, kneading and extruding route of base compounds previously and is extruded to mold it before both of them are mixed uniformly. CONSTITUTION:When base compound and mark compound are kneaded respectively by kneading and extruding machines and the flows of both compounds are joined forcibly in the vicinity of an extruding and molding die while the mixed compound is extruded and molded by a molding die before both of them are mixed uniformly, the flow mark of the mark compound remains in the extruded and molded form whereby patterns can be obtained. In case both of the compound are made of the same qualitied materials, the fusing of both compounds in the interface thereof can be contrived, therefore, both of the compounds will never be separated from each other and a sheet prominent in strength be obtained. The amount of mixing is obtained by rX(L/D) in case a shear strain speed is (r), the length of the screw of the kneading and extruding machine is L and the diameter of the screw is D, therefore, the amount of mixing, which realizes the patterns, can be regulated by changing the length L of the screw for the kneading and extruding machine. |
