| 摘要 |
PURPOSE:To arrange so that no sag may occur by blending inorganic powder having coefficient of friction lower than cured liquid rubber into curable liquid rubber and curing the mixture in a centrifugal molding device. CONSTITUTION:Inorganic powder having coefficient of friction lower than cured liquid rubber of curable nature is blended into curable liquid rubber to obtain a mixture. For instance, calcium carbonate averaging 1.4mum of grain size and curing agent are added to liquid polyurethane rubber and are stirred and mixed into a curable liquid mixture. Next, the mixture is injected into a cylindrical centrifugal molding device and then is centrifugally cured into a cured cylindrical object. The external surface of the curved cylindrical object is polished to a smoothing finish and cut sideways in the form of belt, thus obtaining a paper carrying belt. The paper carrying belt has an internal surface 20 of cured liquid polyurethane rubber having high coefficient of friction and an external smooth surface 21 of film mainly composed of calcium carbonate powder having low coefficient of friction. |
