Twin screw extruder in the extrusion process of how to make the temperature control?

Extruder temperature control in the granulation process is a very important process control, temperature control is good or bad directly affects the quality of the product, is especially important for some for temperature sensitive materials. Temperature control is generally includes heating and cooling. That in the process of twin screw extruder extrusion is how to adjust the temperature?

Extruder in extrusion process heating way have?

, heater heating (hot) : 1 65 extruder currently USES electric heating, a relatively clean, effective, easy to control the heating mode. Is the electric heater (there a resistance wire) packaging on the barrel, through electric heating, because of the heat conduction, convection and radiation, the function of heating and the molten material.

The heater mica heaters, now in general ceramic heater, cast aluminum heater, cast copper heater, cast iron heater, etc., the effect of all kinds of heater has some differences, mica heater lower cost, easy processing, use fixed number of year is shorter; Ceramic heater, cast iron heater power is larger, warming faster, can rise to more than 300 ℃ or higher, life is relatively short, longer than mica heaters. Cast aluminum heater, cast copper heater due to the high thermal efficiency, good thermal insulation performance, long service life and the most commonly used.

2, in the process of extrusion shear friction heat (internal)

A: in the process of extrusion, plastic particles morphology due to strong extrusion pressure deformation produced by the heat.

B: plastic particles, and between particles and due to the friction between machine barrel and screw heat;

In extruder extrusion process, for the sake of accurate temperature control, the need for extruder cooling. First, because extruder temperature in the heating process of inertia, in the process of heating up, no matter what kind of heating mode, stop heating, because the temperature rise of inertia, the temperature will continue to rise, at this moment need to watch the control parameters of temperature control instrument, precision, etc. Second, because the shear friction heat in the process of extrusion (internal), internal heat generated by the processing temperature rising, the characteristics of the material, cause material become waste.

Actually internal heat generation is not all bad, as long as the good control of temperature, the use of internal heat to provide the temperature needed for processing, not only reduce or reduce the use of electrical energy, and energy conservation and environmental protection. Note: parallel to the direction of the twin screw extruder extrusion metering section is almost don't need to be heated in the process of production, but also the proper cooling.

In the process of the extruder extrusion cooling way? What are those?

A: the air natural cooling: cooling efficiency is low, the temperature is not easy to control

B: the wind cooling, by controlling the cooling fan, stop or control cooling wind pipe valves open and close, wind to cool the section of the barrel temperature. Cooling speed slower, more machine does not apply to internal heat generation.

C: soft water (multi-purpose distilled water) cooling: controlled cooling water electromagnetic valve open and close, make the soft water through the barrel water take away heat, so as to achieve the purpose of cooling. At the same time also need to refill in soft water cooling cold water cooling has to heat up water. This method of cooling speed, convenient to control. Cooling inertia is big, but the disadvantage is that the control of the temperature control table, in the process of solenoid valve, as well as the design of the cooling water channel requirements is quite high.

D: heat conduction oil cooling: principle and soft water cooling is similar, just different thermal conductivity of the medium. Even relatively soft water cooling heat conduction oil cooling soft. But for the piping of the sealing requirement is high, or spill consequences will be severe.