Industry market: manufacturing and status of roller – roller, roller Introduction – Printing Industry
Roller, especially for the plastic mirror roll Package No equipment industry is a key component indispensable, whether rolling, extrusion or forming are inseparable from the tape roll. Production of precision roller surface quality and internal flow structure of the reasonable and processing accuracy is good or bad, will directly affect the quality of plastic products, in particular, is especially true for the plastic film. Therefore, a high-quality roller products for manufacturers of plastic film membrane is particularly important. Many different kinds of rolls, and has its unique role in flow divided by rolling stick, pressure bachelor, tape rolls, etc., divided by function and purpose of heating rolls, cooling rolls, away from the roller, roller, etc., by structure divided into seamless steel pipe roller, forging and centrifugal casting roll. In short, the plastic products of different processes require different roll, therefore, as a roller roller manufacturer in the production process to undertake, should be for different products, different processes Design Manufacture of the corresponding roller to roller in the production process to ensure that play their normal role. Whatever the process approach, on the roller structure, design, material selection and processing should meet several basic requirements below:
1. Roll should be rigid enough to ensure that under heavy loads, bending does not exceed the allowable value.
2. Roll surface should have sufficient hardness to HRC50 degree the above general requirements, has strong corrosion resistance. Coating with anti-stripping ability, to ensure that the work roll surface has good wear resistance and corrosion resistance.
3. Roller work surface to be refined and processed, to ensure dimensional accuracy and surface. Roughness should be Ra0.16, and did not have holes or grooves. Roller working surface of the wall thickness should be uniform, otherwise it would roll surface temperature is uneven, affecting product quality.
4. Roll of material should have good thermal conductivity, usually chilled cast iron, cast steel or special circumstances with chrome molybdenum alloy steel, either heating or cooling, can achieve rapid uniform.
5. Roller design to facilitate processing, low cost.
Film products in the production of the special requirements of the roller
In rolling and extrusion process, usually under a lot of roller compaction force, the relative separation of power products to some extent, so that the roller bearings at both ends as if supported on the cylindrical beam, it is not Bending of beams with general theoretical formula to calculate the deformation, but with the deflection value (including the bending deflection and shear deflection) of the formula are the maximum deformation. Proved in actual production, the total central deflection roller products allow far greater than the tolerance, it is necessary to compensate, otherwise not meet the requirements of precision products. As the largest deflection in the middle of the roller, both ends of the smaller, and therefore appear to intermediate products, thick, thin ends of the situation, so deflection compensation method is usually three, namely, a high degree of law, pre-load method and the pre-load device.
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