Dies for extrusion moulding

Details Dies for extrusion moulding Dies for extrusion moulding

1996-02-28

1998-03-31

Mackey, James P.

Plastic article or earthenware shaping or treating: apparatus

With direct application of magnetic force to manipulate...

264429, 264DIG58, 425380, 425461, 425467, 425DIG33, B29C 4720, H01F 4102

Patent

active

057335800

ABSTRACT:
A die for extrusion molding a resin bonding magnet. In the production of the magnet, a molten mixture of a magnetic powder and a resin are introduced into a cavity between an outer die and a mandril to which a magnetic field is applied. A steep temperature gradient along the die axis direction of the molten mixture and the cavity is achieved by making the outer die of a multiple layer structure along the die axis direction, utilizing two or more axially adjacent blocks or sheets made of the same or different materials whereby fluidity of the molten mixture is sufficiently high at the inlet of the cavity to enable the magnetic powder in the molten mixture to be sufficiently orientated in the direction of the magnetic field and then the molten mixture is cooled to a solidified state so that the orientation of the magnetic powder is not disturbed, thereby producing a magnetic having high magnetic properties.

REFERENCES:
patent: 3387066 (1968-06-01), Martin et al.
patent: 3732617 (1973-05-01), Rowe et al.
patent: 3918867 (1975-11-01), Beyer
patent: 3981653 (1976-09-01), Greenhalgh et al.
patent: 4150927 (1979-04-01), Steingroever
patent: 4604042 (1986-08-01), Tanigawa et al.

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