Thickness unevenness of a coating liquid layer in a width direction of a web is adjusted by moving a guide roller at the proximity of a coating rod so as to deliberately provide tension variation in the width direction of the web in purpose of forming the coating liquid layer with a desired thickness on the web by the coating rod. The artificial port has an entrance conduit with an inwardly tapering section. An ohmic contact is provided on an exposed portion of the p-type epitaxial layer. The cushioned platen liner, which is preferably comprised of or coated with silicon, is utilized as a separator between the metal platen of the manufacturing machine, as well as cushion for the molten rubber as it is pressed through the conveyor belt perforations during vulcanization. The table assembly returns to the home position while supporting the object on the upper table and keeping the upper and lower tables separated.