Environmental Protection Is Not A Problem With Powder Injection Molding

Metal powder injection molding (MIM) is a new near net forming technology developed from plastic injection molding technology, which combines powder metallurgy technology and plastic injection molding technology. It includes four process steps: mixing, injection molding, degreasing, sintering, etc.

The green body of the product is placed on ceramic sheets and placed in a degreasing furnace. Polyoxymethylene undergoes catalytic reactions in an acidic atmosphere, generating formaldehyde. As formaldehyde is a harmful gas to the environment and human body, it cannot be directly discharged into the air, so exhaust gas treatment is necessary.

 

 

Generally, a heater is installed at the exhaust pipe, and formaldehyde is heated and burned through the exhaust port, generating harmless water vapor and carbon dioxide gas that can be discharged into the outside world through the exhaust pipe. Degreasing: After catalytic degreasing in a degreasing furnace, the ash billet cannot completely decompose all the binder (POM), and there is still some residual binder. Therefore, before sintering, a degreasing process should be carried out in the sintering furnace. Empty the air inside the sintering furnace (filled with nitrogen), then heat it to around 600 degrees Celsius, remove the residual binder in the ash billet, and collect it through a capture system for proper disposal, without causing environmental pollution.