- The importance of dryer to metal powder production process
One of the characteristics of metal injection molding is that the injection feed requires the metal powder and organic binder to be mixed and granulated. However, the metal powder used for metal feeding and granulation is usually prepared by air atomization or water atomization. The preparation process of this powder itself will lead to a certain amount of moisture in the metal powder, so it is very necessary to dehumidify and dry the metal powder.
About the metal powder dehumidification, some feed manufacturers will be in the use of mixer for mixing when completed, namely before mixing granulation process officially entered the metal powder into the mixing chamber of moisture drying, with metal powder moisture volatilizes again when almost into the mixing materials such as binder, and some will feed manufacturer in granulation production lines installed upstream of a specialized metal powder dryer, to ensure that enter the mixer is dehumidification drying degree qualified can be directly used for metal powder metal granules.
- Type, structure and working principle of metal powder dryer
There are many types of metal powder dryers on the market, but the basic principle is the same. Let’s take the rotary dryer as an example to learn how the metal powder dryer works.
Rotary metal powder dryer by the solid of revolution, feed plate, driving device, made from a device and sealing ring, as the metal powder is transferred to the top, namely into the cylinder, can be rotated copy plate to the rear of the dryer in tilted, metal powder on the one hand, influenced by gravity and slow down the action of turning force, on the other hand, threw up and constantly copied again and again, after being thrown up metal powder sets in the drying cylinder is continuously evenly to form a similar curtain uniform flow of metal powder. The drying of metal powder depends on the strong heat flow inside the tube for heat exchange.
In fact, the working principle of metal powder dryer is very simple, but in the actual operation process at ordinary times is going to have some similar dryer blockage problem, if you have any larger particles of powder metal powder or other mechanical impurities can cause in the process of metal powder mixed transportation or high viscosity than the dryer conveying limit, resulting in metal powder dryer blockage.
Metal feed manufacturers, therefore, in the use of metal powder dryer for drying, should choose the appropriate filter device, the impurities from the metal powder through a sieve clean, ensure uniform metal powder particle size is consistent, conditional manufacturers can also be used with air drying device and pressure drying device of metal powder dryer, when high pressure pump pressure can not meet the drying stress of compressed air may be used for drying, with high-pressure pump to stop the compressed air in normal working conditions.
