Magnetic disk cartridge and method of manufacturing same

Details Magnetic disk cartridge and method of manufacturing same Magnetic disk cartridge and method of manufacturing same

1991-06-20

1994-04-26

Silbaugh, Jan H.

Dynamic magnetic information storage or retrieval

Record medium

In container

26432812, 26432818, B29C 4516, B29C 4576

Patent

active

053072294

ABSTRACT:
A magnetic disk cartridge which is free from the difficulty associated with the color of the cartridge being nonuniform in the area of weld lines which are likely to be formed in the injection molding of a colored synthetic resin, thus impairing the external appearance of the cartridge, and to a method of manufacturing the magnetic disk cartridge. In accordance with one embodiment of the invention, a magnetic disk cartridge is provided which is formed by injection molding a molten resin prepared by mixing master batch pellets of SAN resin at least 100 gm/10 min in melt flow rate and natural pellets of ABS resin at least 25 gm/10 min in melt flow rate in a ratio of 1:50 to 1:15 by weight. In accordance with another embodiment, a molten resin is injected into a metal mold cavity through a pair of injection gates provided near one end portion of the metal mold cavity, and gas in the cavity is discharged from the metal mold through a degassing arrangement provided at or near a position where a weld line is expected to be formed by the molten resin injected through the pair of injection gates.

REFERENCES:
patent: 2935763 (1960-05-01), Newman et al.
patent: 4122135 (1978-10-01), Valoti et al.
patent: 4252764 (1981-02-01), Tokas et al.
patent: 4983648 (1991-01-01), Laughner et al.
patent: 5116547 (1992-05-01), Tsukahara et al.
Patent Abstracts of Japan, vol. 11, No. 75 (C-408), Mar. 6, 1987 & JP-A-61 233 041 (Dainichi Seika Kogyo K.K.) Oct. 17, 1986.
Patent Abstracts of Japan, vol. 10, No. 349 (M-538), Nov. 26, 1986 & JP-A-61 149 330 (Sumitomo Bakelite Co., Ltd.) Jul. 8, 1986.

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