All converting slitter rewinders require an unwinding system.Although often considered a simple function,the selection of a proper unwinding system is extremely important to the overall productivity of the slitter rewinder.The major trade-off of an unwinding system is cost versus efficiency.A light duty unwind may be the most cost effective for a low production operation but,for high production operation - a rugged duty,shaftless,floor pick-up is often more suitable for maximum operation speed and roll changing efficiency.The shaft selection,chucking system,type of chucks,braking system,tension control,web squaring,side shifting and edge guiding equipment will also affect the overall performance.This paper discusses the proper selection of an unwind and the auxiliary equipment to ensure the maximum performanc eand productivity form a slitter rewinder.
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