15. What is the effect of loading capacity on the quality of rubber mixing and molding?
Loading capacity refers to the actual mixing capacity of the smelter, which often accounts for only 50-60% of the total capacity of the mixing room of the smelter. If the capacity is too large, mixing without sufficient clearance, can not be sufficiently stirred, resulting in uneven mixing; temperature rises, easy to cause self-sulfurization of the rubber; will also cause motor overload. Capacity is too small, there is not enough friction resistance between the rotors, idling, also resulting in uneven mixing, so that the quality of mixed rubber is affected, but also reduce the utilization rate of the equipment.

16. Why should the liquid softener be added last when mixing the rubber?
Rubber in the mixing, if the first to add liquid softener, it will make the raw rubber over-expansion and affect the mechanical friction between the rubber molecules and fillers, reduce the speed of rubber mixing, but also cause uneven dispersion of powder, or even agglomeration. Therefore, liquid softener is usually the last to be added when mixing.

17. Why the rubber compound will be "self-sulfurized" if it is placed for a long time?
The main reasons for "self-sulfurization" of rubber mixing materials are: (1) using too much sulfurizing agent and accelerator; (2) loading a large capacity of rubber, the temperature of the refining machine is too high, and the film is not cooled down enough; (3) or adding sulfur too early, the dispersion of chemicals is not uniform, resulting in the local concentration of accelerator and sulfur; (4) improper parking, i.e., the temperature of the place where the parked is too high, and the air is not circulated.

18. Why should there be a certain wind pressure when mixing rubber in the refining machine?
Mixing, refiner mixing chamber in addition to raw rubber and chemicals, there is a considerable portion of the gap exists, if the pressure is not enough, the raw rubber and chemicals do not get enough friction pinch, resulting in uneven mixing; and increase the pressure, the rubber will be up and down, left and right by the powerful friction pinch, so that the raw rubber and with the agent is quickly mixed uniformly.

19. Why open refiner two rolls to have a certain speed ratio
The purpose of the open refiner design speed ratio is to strengthen the shear effect on the rubber material to produce mechanical friction and molecular chain fracture, to promote the dispersion of the cooperating agent. In addition, the front roll speed is slow, but also conducive to the operation, conducive to safe production.

20. Why does the refiner produce the thallium phenomenon
Refiner thallium clamping causes generally speaking, there are three aspects: (1) the equipment itself has a problem, such as: on the top of the leaking leash, etc., (2) the wind pressure is insufficient, (3) improper operation, such as adding softeners do not pay attention to the top of the bolt and the refiner chamber wall will often be glued to the adhesive, such as not timely cleanup, over time, it will have an impact on the.

21. mixing film why the pressure will be scattered
Mixing due to inadvertence, often pressure dissipation, caused by many reasons, mainly: (1) violation of the process regulations of the dosage order or dosage too quickly; (2) mixing room temperature over the bottom of the mixing; (3) the formula of the filler with too much, etc., are possible. As a result of poor mixing, and the rubber will be pressed loose. The rubber material should be added with the same rubber number of plasticizing rubber or mother rubber, to be pressed together and discharged, and then make technical processing.