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Casting process and mold design of polyurethane roller

Views: 76 Update date: Nov 24,2020

  polyurethane rollerPolyurethane roller generally refers to a cylindrical product with a metal core in the middle and polyurethane outside. According to the purpose, it is divided into metallurgy, papermaking, textile, food processing, printing polyurethane roller, etc. Compared with ordinary rubber rollers, polyurethane rubber rollers have the characteristics of high mechanical strength, good oil and abrasion resistance, outstanding compression resistance, wide range of hardness, superior machining performance, high surface finish and high bonding strength with metal cores. It is more suitable for use under high line speed and high line pressure. In recent years, this type of rubber roller has been widely used in various industries to replace the general rubber roller.

  The formulas of PU rubber rollers vary widely, but the casting process is roughly the same. The CPU rubber roller molding method can adopt normal pressure casting, vacuum stress-free casting, rotary casting, and casting molding. The most commonly used method is normal pressure casting.

  The mold of the PU rubber roller should be designed according to the size of the urethaneroller, the pouring method, and the complexity of the product structure. Generally speaking, Huff molds are mostly used for rubber rollers with large external dimensions, thin adhesive layers, large production volumes, and complex geometric shapes, while integral molds are used instead. When designing the mold, an appropriate machining allowance should be left according to the shrinkage rate and finishing amount of polyurethane rollers with different hardness.

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