Application of rollers in plastic packaging

Different rollers should be selected for different processes: rollers, especially mirror rollers, are an indispensable and important component for the preparation of plastic packaging work. Whether it is calendering, extrusion or tape casting, the rollers are inseparable. The surface precision quality of the roller, the rationality of the internal flow channel structure and the processing accuracy will directly affect the quality of plastic products, especially for plastic films. Therefore, supplying a high-quality roller is particularly important for plastic sheet and film manufacturers. There are various types of rollers, and they all have their own unique functions. According to the process flow, there are calendering rollers, pressing rollers, casting rollers, etc. The structure is divided into seamless steel pipe rolls, casting and centrifugal casting rolls. All in all, different processes of plastic products require different rollers. Therefore, as a roller manufacturer, in the process of accepting the roller production process, it should make corresponding rollers for different products and different process plans, so as to ensure that the rollers are play its normal role in the production process.

No matter what process method is used, the structure, planning, material selection and processing of the roller should meet the following basic requirements:

1. The roller should have satisfactory rigidity to ensure that the bending deformation does not exceed the allowable value under heavy load.

2. The surface of the roller should have satisfactory hardness, generally required to reach HRC50 degrees or more, with strong corrosion resistance. The coating has anti-shedding ability to ensure that the working surface of the roller has good wear resistance and corrosion resistance.

3. The working surface of the roller should be precisely machined to ensure dimensional accuracy and surface roughness. The roughness should be above Ra0.16 without pores or grooves. The wall thickness of the working surface of the roller should be uniform, otherwise the temperature of the roller surface will be uneven, which will affect the quality of the product.

4. The material of the roller should have good thermal conductivity. Generally, chilled cast iron is used. In special cases, cast steel or molybdenum-chromium alloy steel is used. Whether it is heating or cooling, it can achieve fast and uniform.

5. Roller design should be easy to process and low cost.