| 摘要 |
PURPOSE: To provide a rubber tube wherein a core after molding can be easily taken out, a molding cycle can be shortened, and proportion defective can be lowered. CONSTITUTION: In a tube, for example, a grommet A, an inner peripheral face 5d is molded at a core 6A during molding. By previously providing an irregular part on the outer peripheral face of the core, irregular parts 5g are formed on the inner peripheral face 5d of the grommet 5A to be molded. Due to the presence of the irregular fitting part, the core can be easily pulled out from the molded tube. Each irregular part 5g is annular or spiral and has a recessed shape or a protruded shape having a diameter of 1mm or less. |
