Because metal powder is more destructive to molds than plastic, injection moulding machines should be equipped with special MIM nozzles, screw rods, rocket heads, check rings and seat rings.

A, Screw. Because metal powder accounts for 60% of the total feed volume, screw compression ratio should be less than that of plastic, about 1.5, avoiding heat accelerating the decomposition of binder.

B, Check ring.Different kinds of feeding materials, such as stainless steel, titanium, tungsten, have different backlash clearances. The powder sizes of different manufacturers are different, and the requirements for the size of the backlash ring are also different. The clearance is generally one to three times the maximum powder diameter.

C. Injection speed. It's enough to inject at a certain speed. Don't use the plastic injection method, which is slow, fast and slow, because the fluidity of the feed does not allow us to do so.

D, Melt glue.High melting speed will lead to the degradation of binder polymers. First, it will affect the density uniformity of blanks. Second, it will reduce the utilization of recycled materials. The service life of the rocket head and check ring will be reduced. Normal speed: 50 rpm, back pressure: not more than 30 bar.

E, When the product is ejected from the mould, the direction of plastic products and MIM parts is completely different.