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 Rollers some coherent introduction
Polyurethane roller -
Abstract: the casting polyurethane elastomer (CPU) tension properties and uses rollers. Layout tight configuration production skills and process and needed.
Key words:, polyurethane prepolymer, casting elastomer, accurate in measurement, mixed evenly, temperature stability, macro bubble free
A, surface:
Characteristics and example 1, polyurethane rollers
Casting polyurethane rubber roller is a roller made of liquid polyurethane rubber by pouring method, compared with the ordinary roller, mechanical strength is high (2~3 times for natural rubber); good wearability (natural rubber 5~10 times); prominent anti compression; hardness field is wide, and it still has high elasticity under a high hardness (this is plastic types are no other features); surface finish; mechanical processing performance is good; and metal bonding of rubber is much higher than ordinary. More suitable for certain line speed and high pressures using.
Polyurethane rollers now grow very rapidly, the original use of a lot of ordinary roller have been replaced by the new polyurethane rollers.
Casting polyurethane rollers are probably divided into polyester, polyether and polycaprolactone type three (of a flexible chain segment tension structure material). Generally speaking, the polyester is used in low, hardness cots, its physical mechanical properties, solvent resistance performance is good, used in nonferrous metal industry. Polyether type used in the high speed, high hardness cots, its good water resistance, low temperature resistance, good processing performance of master, used to manufacture wire drawing roller, printing roller. Poly has good comprehensive properties of lactone type, low temperature resistant performance and good hydrolysis resistance, commonly used for pressing roller and requires high rollers.
2, the fundamental requirements of polyurethane materials:
(1) physical mechanical properties must be index for various rollers meet;
(2) and roll core has good adhesion, to conform to the requirements of process adhesive;
(3) should meet the requirements of the rubber hardness, hardness of roll surface should be uniform uniform;
(4) looks no bubble, impurities and mechanical injury.
Nervous skills performance 3, rollers
(1) hardness: all sorts of COTS hardness reference value
Paper roll
Printing rollers
Printing rollers
Other rollers
(2) the appearance requirements: according to the specific use, some require appearance smooth or through special processing or treatment.
(3) in the high rate: the diameter difference between diameter and end edge middle rollers. Its role is to add more elongated deflection roller in operation, high rate with the rollers roll length and growth.