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What are the mixing principles of the open mill

What are the mixing principles of the open mill

  • Categories:Industry News
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  • Time of issue:2020-11-26
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(Summary description)What are the mixing principles of the open mill
The mixing process of an open mill generally includes three stages: wrapping roll, eating powder and turning.

What are the mixing principles of the open mill

(Summary description)What are the mixing principles of the open mill
The mixing process of an open mill generally includes three stages: wrapping roll, eating powder and turning.

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2020-11-26
  • Views:0
Information
What are the mixing principles of the open mill
The mixing process of an open mill generally includes three stages: wrapping roll, eating powder and turning.
(1) Packing roller
Several states of rubber in the open mill
1—Rubber is not easy to enter the roll gap; 2—The front roll is tightly packed; 3—The roll is taken off into a bag shape; 4—It is a viscous flow wrap roll
(2) Eat noodles
Before the rubber material wraps the roller and participates in the compounding agent, the upper end of the roller distance should be stored with proper accumulated glue. A proper amount of accumulated glue is a necessary condition for eating powder.
(3) Refining
Circumferential: the most average mixing; axial: uneven; radial: the worst average
Influencing factors of open mill mixing

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1. Glue loading capacity
The rubber loading capacity should be reasonably affirmed according to the specifications of the open mill and the characteristics of the rubber formula. If the capacity is too large, the mixing and dispersion effect will be reduced, and the mixing temperature will increase, which will easily cause scorching and affect the quality of the rubber; too small a capacity will reduce the consumption efficiency.
In the formula, V—packing capacity, L; D—roller diameter, cm; L—roller length;
2. Roll distance
The roller distance is generally 4~8mm. As the roller pitch decreases, the shearing effect increases, but the heat generation is greater.
3. Mixing temperature
The roller temperature is too low, the rubber material is too hard, and it is easy to damage the equipment. The increase in roll temperature is beneficial to reduce the viscosity of the rubber compound and speed up the mixing and feeding speed. However, if the temperature is too high, it is easy to cause the rubber to roll off and scorch, which is difficult to operate.
Roll temperature is usually maintained between 50~60℃ after cooling. However, when kneading a compound containing a high melting point compounding agent (high melting point coumarone resin, etc.), it is necessary to increase the roll temperature appropriately.
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