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The roller especially mirror roller for plastic packaging industry is no preparation is an indispensable component, both calendering, extrusion or tape casting all cannot do without. Production of precision roller surface quality and internal flow structure is reasonable and the precision is good or bad, will directly affect the quality of plastic products, especially for the plastic film is even more so. Therefore, to provide a high quality roller is particularly important for the plastic film products factory. The variety, and has its unique role, according to the process consists of rolling stick, pressure casting roll singles, etc. according to the function, a heating roller, cooling roller, away from the roller, roller and so on, divided by the structure of seamless steel tube, roll forging and centrifugal casting roll. In short, different processing plastic products require different roller, therefore, as a roller manufacturer undertake roller in the production process, different products, different process design manufacturing corresponding roller, to ensure that the roller to play its normal role in the production process. Regardless of the technology, the structure, design, material selection and fabrication shall meet the following basic requirements:

1 roller should be sufficiently rigid, ensure that under heavy load, bending deformation does not exceed the allowable value.

2 roller surface should have sufficient hardness, general requirements up to HRC5

More than 0 degrees, with strong corrosion resistance. Coating has the anti stripping ability, ensure the working surface of roller has a better wear resistance and corrosion resistance.

3 roller working surface should be fine processing, to ensure the dimensional accuracy and surface roughness. Roughness should be in Ra0.16 above, can not have holes or grooves. The working surface of drum wall thickness should be uniform, otherwise it will make the roll surface temperature uneven, affecting product quality.

4 roller materials should have good thermal conductivity, usually using chilled cast iron, cast steel or special circumstances by chromium molybdenum alloy steel, either heating or cooling, were able to achieve rapid and uniform.

5 roller is designed to facilitate the processing and low cost.