| 摘要 |
438,612. Injection moulding. VOGT, H., 10, Garystrasse, Dahlem, Berlin. June 1, 1934, No. 16440. Convention date, June 1, 1933. [Class 87 (ii)] [See also Group XXXVI] Magnetic cores for high-frequency purposes are made by squirting a mixture of magnetic powder and a thermoplastic binder through a perforated plate into a mould, the core being cooled while in the mould and then ejected. Cores of pot-shape, U-shape or E-shape may be constructed. An electrically heated cylinder 7 contains the mixture 14 which is forced through holes in a plate 17 by a plunger 8, the mould 16 being detachable and the formed core being ejected by a member 18 held in position by a pin 19. The temperature of the mixture is regulated by variable resistances and the bridge circuit 13, the moulding operation being effected at a lower temperature. The mould may have an exciting coil producing a strong magnetic field in the direction of the highfrequency field when the core is subsequently in use, and it may be provided with a cooling jacket. |
