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Language: English Portuguese Russian
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Training Time: 26 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, Russian
The purpose of a winder is to convert the large diameter, machine-width parent reels of paper or board produced on a paper or board machine into finished roll sets ready for converting or shipping. Winder slitters are used to cut parent reels into various roll widths and trim off the edges of the sheet in order to meet customer requirements. This module will describe common slitting methods and recognize safety guidelines applicable to winder slitters and slitter sections.
At the end of this module, you will be able to:
The following key questions are answered in this module:
Why are bottom slitters driven slightly faster than the sheet?The overspeed prevents buckling and bunching up of the sheet at the entrance to the slitters.
There are several different slitting methods - water jet, razor, score/crush, and shear. Which is the most common?Shear slitting is the most common method used on paper and board machine winders because it gives high quality cuts on a wide range of grades at relatively high speeds.
Why is each bottom slitter driven instead of mounting all of the bottom slitters on a driven carrier roll?Because the carrier roll diameter must increase as the winder speed and machine width increase, in order to control vibrations, individual motor slitters have become more popular.
They are often referred to as ""knives,"" but only the top slitters look sharp. How do most slitters cut the sheet?On most winders, the top slitters are sharp circular blades and the bottom slitters are bands. The top blade slightly overlaps the bottom band and is loaded from the side to cut the sheet using a shearing action, like scissors.
When roll sizes change, how are the slitters repositioned?Slitters can be repositioned manually or automatically. Manual positioning exposes workers to hazards and takes longer, so is more appropriate when slit widths don't change very often.
Below is a transcript of the video sample provided for this module:
Carrier Ropes - Design and Operation
View Course
Dry End QCS Scanner
Paper Machine Reel Systems
Paper Machine Winding Basics
Roll Handling and Wrapping
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