| 摘要 |
<p>An elongate tape cassette storage sleeve having one open end and one closed end is formed by injection moulding in a cavity (42) between a hollow mould (40) and a core (44). The core extends within the mould from a mounting at one end and its free end is held located between opposed walls of the mould by two mould inserts (54); the inserts are interposed between the mould walls and the core on opposite sides of the core. The inserts are retained in dove-tail slots (52) in the mould. Each insert comprises three spaced parallel ribs (56) which lie flush against an opposed inclined face (48) of the core in a shut-out fit. The ribs form three ventilation slots (16) in the sleeve at its closed end and also form two cassette-pinching ribs, between the slots, which acquire sloping cassette-engaging surfaces from the inclined face (48) of the core.</p> |
