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The common sense of polyurethane rubber roller
1. Characteristics and types of polyurethane rubber rollers:
The cast polyurethane roll is a rubber roll manufactured by pouring a liquid urethane rubber. Compared with ordinary rubber rollers, it has high mechanical strength (2-3 times that of natural rubber), excellent wear resistance (5-10 times for natural rubber), outstanding compression resistance; wide range of hardness, And it has high elasticity under high hardness (this is the characteristic that other rubber types do not have); high surface finish; superior machinability; and metal adhesion is much higher than ordinary rubber, more suitable for certain line speed and high Use under pressure. Recently, the polyurethane rubber roller has developed rapidly. The original large number of ordinary rubber rollers have been replaced by new polyurethane rubber rollers. Castable polyurethane rubber rolls are generally classified into three types: polyester type, polyether type and polycaprolactone type (refer to the main constituent materials of the soft segment). In general, polyester type is widely used in low and medium hardness rubber rolls, which has high physical and mechanical properties and good solvent resistance, and is often used in the non-ferrous metal industry. Polyether type is widely used in high-speed, high-hardness rubber roller. It has good water resistance, excellent low temperature resistance and good process performance. It is commonly used to manufacture drawing rolls and printing rolls. The polycaprolactone type has excellent comprehensive performance, low temperature resistance and hydrolysis resistance, and is often used as a press roll and a high demanding rubber roll.
2, the basic requirements of rubber roller for polyurethane materials:
(1) The physical and mechanical performance indicators required by various rubber rollers must be met;
(2) Must have good adhesion to the roll core to meet the process requirements of bond forming;
(3) The hardness of the rubber roller should meet the requirements, and the hardness of the roller surface should be uniform;
(4) No bubbles, impurities and mechanical damage on the surface.
3, the main technical performance of rubber roller (1) Hardness: hardness reference value of various rubber rollers Paper-making rubber roller printing rubber roller printing rubber roller other rubber roller name hardness (Shao A) Name hardness (Shao A) Name hardness (Shao A Name hardness (Shao A) Squeeze rubber roller 80-90 Printing rubber roller 92-97 High-speed rotation mechanism leather roller 50-60 Squeeze rubber roller 75-85 Mercerized roller 85 Ink roller 20-25 Cold roller 85-95 Drying cylinder Roller 85-95 Mercerized Roller 80-85 High Speed ​​Platform Ink Roller 25-30 Grout Roller 60-65 Copper Mesh Roller 35, 80 Wire Square Washing Roller 80-85 General Platform Ink Roller 20-25 Fingerprint Roller 20- 30 points blanket rubber roller 95-100 flat washer upper roller 100 offset printer ink roller 30-35 typewriter rubber roller 85-90 paper roller 95-100 flat washer lower roller 80 general printing ink roller 40-45 Silicon Valley rubber roller 75- 95 chest roller 70-80 rope washing machine roller 80-90 drawing roller 85-90 felt roller 95-100 padding roller 85 vacuum roller 80-90 hollow roller 55-60
(2) Surface requirements: depending on the specific application, some require a smooth surface or special processing or treatment.
(3) Medium-to-high ratio: the difference between the diameter of the center of the rubber roller and the diameter of the end edge. Its function is to compensate for the deflection deformation of the slender rubber roller during operation, and the medium-high rate of the rubber roller increases with the length of the rubber roller.
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