Characteristics of several common types of rubber calendering

  Rubber is made in the process of many steps, rubber calendering is one of the steps, and different types of rubber, because of their characteristics, and the effect of calendering is different, commonly used rubber are natural rubber, butadiene rubber, butadiene rubber, neoprene, ethylene propylene rubber, butyl rubber, and nitrile rubber, these rubber calendering characteristics are not the same, let us take a Let's take a look.Rubber(Plastic) Calender

  Natural rubber is the easiest type of rubber for rubber calendering, because of its large thermoplasticity and small shrinkage rate, which makes the calendering work easier. However, natural rubber tends to adhere to hot rollers, so when calendering, the temperature difference should be properly adjusted so that the film can be transferred smoothly between the rollers.

  The thermoplasticity of SBR is small, but the shrinkage is large, so it should be fully plasticized before calendering. Butadiene rubber is extremely sensitive to heat, its calendering temperature is generally lower than the natural rubber calendering temperature of 5 ℃ -15 ℃, and the temperature difference between the rolls should be high to low.Rubber(Plastic) Calender

  The semi-finished products of satin rubber calendering compared with styrene-butadiene rubber, the rubber is more rubber smooth, tight, and soft, and the temperature of calendering is as low as that of satin rubber calendering than natural rubber.Rubber(Plastic) Calender

  Butyl rubber has a characteristic to be calendered with filler, so that it is easy to the calender, butyl rubber sticky cold rollers, off the hot rollers, and calendering of the individual rollers should be maintained in a certain temperature range.Rubber(Plastic) Calender

  NBR has small thermoplasticity and large shrinkage, to reduce its shrinkage, it is necessary to add filler or softener in the rubber, and the weight of the filler should account for more than 50% of the important raw rubber so that the calendered film can look smooth surface.

  The calendering of neoprene is more difficult to carry out, it needs to be carried out at a low temperature, generally below 65℃, or use a high temperature method, the temperature is above 95℃, this is because the general-purpose neoprene is easy to stick to the rollers at the temperature of 75℃-95℃. In addition, it should also be noted that this kind of rubber calendering quickly cools down after.

  Ethylene propylene rubber calendering temperature range is relatively wide, generally in 80 ℃ -120 ℃ can be continuous operation, calendering performance is still relatively good, but it is worth noting that the rubber calendering temperature should not be too low if the temperature is too low, the shrinkage of the rubber material will become larger, easy to produce bubbles, not conducive to calendering, calendering rubber Menny viscosity should also be appropriate.

  These are the seven common rubber calendering characteristics, in the daily calendering work that must be more attention.Rubber(Plastic) Calender