10L Metal Internal Mixer Polymer Processing Equipment

Weibulen specializes in the production of 10L metal internal mixers and 10-liter metal powder internal mixers. The 10L metal internal mixer is specifically designed for mixing various metal powders in the MIM process, including stainless steel powder mixing, iron powder mixing, titanium alloy mixing, tungsten alloy mixing, copper alloy mixing, and more. The 10L metal internal mixer can process 45 kg per batch, offering excellent dispersion and low maintenance rates, which have earned it widespread acclaim among MIM customers.


I: 10L Metal Internal Mixer Specifications

Mixing capacity-------------------------------10L

Drive motor-------------------------------15KW

Tilting motor-------------------------------0.75KW

Tilting angle-------------------------------110°

Output----------------------------------45KG (per batch)

Dimensions (H*W*L)-------------------------2.2*1.35*2.15M

Machine weight-----------------------------------2300KG

II: Working Principle of the 10L Metal Internal Mixer

During operation, the two rotors of the 10L metal internal mixer rotate relative to each other, gripping the material from the feed port and drawing it into the nip, where it is subjected to squeezing and shearing by the rotors. After passing through the nip, the material encounters the sharp edge of the lower plunger and is split into two parts, which then travel along the gaps between the front and rear chamber walls and the rotors, returning above the nip. As the material circulates around the rotors, it is continuously subjected to shearing and friction, causing its temperature to rise sharply and its viscosity to decrease. This enhances the wetting of the rubber on the surface of the additives, ensuring full contact between the rubber and the additives. Additive agglomerates, along with the rubber, pass through the gaps between the rotors, the upper and lower plungers, and the inner walls of the mixing chamber, where they are sheared and broken apart, enveloped by the stretched and deformed rubber, and stabilized in their fragmented state. Meanwhile, the rotor's ribs drive the material axially along the rotor, providing a stirring and mixing effect that ensures uniform dispersion of the additives in the rubber. The repeated shearing and breaking of the additives, combined with the continuous deformation and recovery of the rubber and the stirring action of the rotor ribs, result in even distribution of the additives in the rubber, achieving a certain degree of dispersion. Due to the significantly higher shearing action and elevated temperature during mixing in the internal mixer compared to an open mill, the efficiency of the internal mixer is much higher.

III: Operating Procedures for the 10L Metal Internal Mixer

1. Calculate the batch size and actual formula based on the capacity of the internal mixer's mixing chamber and an appropriate fill factor (0.6–0.7);
2. Accurately weigh all raw materials according to the actual formula, and arrange them in order on the storage rack: raw rubber, minor ingredients (ZnO, SA, accelerators, antioxidants, solid softeners, etc.), reinforcing agents or fillers, liquid softeners, and sulfur;
3. Turn on the power and heating switches of the internal mixer to preheat it, while checking whether the air pressure, water pressure, and voltage meet the process requirements. Verify that the temperature measurement system, timing device, and power system indicators and recordings are normal;
4. After preheating the internal mixer, allow it to stabilize for a period before starting the mixing process;
5. Raise the upper plunger, feed the raw rubber (cut into small pieces) into the mixer through the feed port, lower the upper plunger, and mix for 1 minute;
6. Raise the upper plunger, add the minor ingredients, lower the upper plunger, and mix for 1.5 minutes;
7. Raise the upper plunger, add carbon black or fillers, lower the upper plunger, and mix for 3 minutes;
8. Raise the upper plunger, add liquid softeners, lower the upper plunger, and mix for 1.5 minutes;
9. Discharge the rubber, measure its temperature with a thermocouple thermometer, and record the initial chamber temperature, chamber temperature at the end of mixing, discharge temperature, power consumption, and rotor speed;
10. Adjust the roll gap of the open mill to 3.8 mm, turn on the power switch to start the open mill, open the circulating water valve, then feed the discharged rubber from the internal mixer onto the open mill for banding. Once the rubber temperature drops below 110°C, add sulfur, cut the rubber from both sides twice each, wait until all sulfur is incorporated and the rubber surface is smooth, then cut off the rubber;
11. Adjust the open mill roll gap to 0.5 mm, feed the rubber for thin passing, make triangle folds, thin pass five times, adjust the roll gap to about 2.4 mm, feed the rubber for banding, wait until the surface is smooth and free of bubbles, sheet off, weigh the total mass of the rubber, place it on a flat, clean metal surface to cool to room temperature, attach a label indicating the rubber formula number and mixing date, and allow it to rest for future use.
For each batch mixing process test report of the internal mixer, record: starting mixing temperature, mixing time, rotor speed, upper plunger pressure, discharge temperature, power consumption, the difference between the mixed rubber mass and the total raw material mass, and the type of internal mixer.
Note: When starting mixing experiments, first mix a batch with the same formula as the test rubber to adjust the internal mixer's working condition before正式 mixing; for the same batch of mixed rubber, the control conditions and mixing time of the internal mixer should remain consistent.