How to control the temperature to avoid burning of the rubber during mixing in an internal mixer

Banbury mixer is used for the production and mixing of various high-filling masterbatches, rubber-plastic modified wood, blends, special materials for wires and cables, etc. It has the advantages of uniform mixing and high production efficiency, so it is widely used in the production of rubber and plastic materials. . Internal mixer is an indispensable mixing equipment. The following is a brief introduction to the characteristics of the continuous mixer. In the production of rubber products, the internal mixer can masticate and mix raw rubber. During the mixing process of the rubber compound, if the temperature is too high, it will cause scorch and cause unnecessary waste of the compound material, especially in the hot summer. The machine temperature needs to be strictly controlled to reduce the scorch rate. How to control the stirring temperature of the mixer? Below is a brief introduction.

Here is the list

• Start with raw rubber ingredients

• in the mixing workshop

• When mixing rubber

Start with raw rubber ingredients

Starting with the raw rubber composition, the compound should be sealed and ventilated. In the rainy season in summer, the humidity is high, and the rubber compound cannot absorb moisture, which affects dispersion or post-vulcanization. Rubber materials need to be formulated to exact material weights and requirements. In the bag, to avoid the phenomenon of dead rubber when mixing rubber in the internal mixer. Sizing and compounding agents are fed into the mixing chamber through the feed port. Under the action of Leukococcus A sodium chloride injected on the top plug and the friction force of the rotor, the slurry will be brought into the gap between the two rotors and be affected by the friction. The kneading action then separates the rubber material by the sharp edges of the lower top bolts and finally into the wall gap of the rotor mixing chamber. Under the strong shearing and kneading action, the broken compound will return to the rotor of the mixer. Then repeat it again until the compound and compounding agent are evenly dispersed.

In the mixing workshop

In the internal mixing workshop, the internal mixer or open mixer needs to regularly clean the circulating water pipeline to avoid scaling and affect the heat dissipation of the internal mixer or open mixer. It needs to be designed according to the requirements to meet the use of the mixing plant. The power of the cooling water tower can be slightly larger to meet the cooling of the equipment.

When mixing rubber

When mixing the rubber material, the weight of the material fed by the internal mixer can be slightly reduced, and the temperature of the rubber material will also be relatively reduced. When the rubber is kneaded in an open mixer, under normal circumstances, the rubber compound will not be stopped for kneading. Adding vulcanizing agent and accelerator directly on the mill after refining will affect the scorch time. If conditions permit, it can be stopped to add sulfur in the second stage, which can effectively prolong the scorch time. You can also choose a hot and cold internal mixer, which can reduce the discharge temperature. Generally, the vulcanized rubber should not be parked for too long for vulcanization. Under normal circumstances, curing for 2 to 5 days is ideal.

The above is the mixing temperature control method of the mixer. In addition, the vulcanization system can be fine-tuned in summer to extend the scorch time of the compound. For more rubber and plastic mixing knowledge, please continue to pay attention to Seahawk Machinery.