| 摘要 |
PURPOSE:To manufacture a good tape hub that does not cause easily slippage, coming off etc. by roughing a formed outer peripheral face of the primary side of double forming. CONSTITUTION:The outer peripheral face 1c of a primary formed product 1 of double formed, tape hub made by injection molding is roughed to form uneven surface. Accordingly, a good tape hub for audio cassette that does not cause slippage or coming off between the primary formed product 1 and secondary formed product even when subjected to a shock can be manufactured easily without using a special die etc. |
