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Slitter machines are designed to divide a large material roll into multiple smaller coils. To ensure consistent quality, it's crucial to maintain precise tension control, which directly affects the production rate and the uniformity of the final product. However, during the process, variations in material thickness can lead to significant accumulated errors in each coil’s diameter. This inconsistency causes fluctuations in tension and speed, resulting in uneven stretching and potential damage to certain coils due to excessive tension.
To address these challenges, differential shafts are used. These shafts allow for accurate control of tension across each individual roll. The friction rings on the shafts operate under a controlled torque, compensating for any speed differences between the rolls. By selecting the appropriate differential shaft based on the material type, slitting width, thickness, and tension requirements, optimal performance can be achieved.
The use of differential shafts enhances the automation level of slitting machines, improving operational efficiency, reducing manual intervention, and increasing the accuracy of rewinding. This is especially beneficial when working with expensive materials such as tinsel, battery separators, and special papers, where even small improvements in tension control can significantly boost productivity and reduce waste.