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Language: English French Polish Portuguese
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Training Time: 14 minutes
Compatibility: Desktop, Tablet, Phone
Based on: Industry Standards and Best Practices
Languages: English, Portuguese, French, Polish
Hard nip calendering is used to smooth the surface and control the caliper or thickness of the sheet before it is wound onto a reel. Some sheet compaction or pressing also occurs. At the end of this module, you will be able to describe the purpose of hard nip calendering and describe the main components of a hard nip calender.
Calendering - Wet Stack
View Course
Carrier Ropes - Design and Operation
Paper Machine Winder Slitting
Paper Machine Winding Basics
Roll Presses
The following key questions are answered in this module:
Why are multi-nip calender stacks with 3 or more rolls used on some paper grades?Multi-nip calender stacks are used in the production of smooth, high gloss paper grades, like magazine paper.
What is a "queen roll"? What is a "king roll"?In single-nip calender stacks, the top roll is called the "queen roll" and the bottom roll is called the "king roll." In multi-nip stacks, the "king roll" is at the bottom and the next roll up+G186 is often called the ""queen roll.""
What adjustment can be made at the calender stack to "fix" soft edges at the reel without changing the nip load?Soft edges at the reel indicate low caliper at the edges. If one of the calender rolls is a variable crown or controlled crown (CC) roll, increasing the roll deflection will increase the caliper at both edges without changing the overall nip load.
What if only one edge is soft?If only one of the edges of the reel is soft, there are two options: either decrease the load on that edge, or decrease the load on the other edge AND decrease the roll deflection in the variable crown or controlled crown (CC) roll.
What is "zone profiling"?Zone profiling works by deforming one of the calender rolls (often the king roll) to adjust the nip pressure at multiple cross-machine positions. The localized nip pressure variation is achieved by increasing or decreasing the diameter of the "zone-controlled roll."" Hot or cold air and nozzles, or induction heaters, can be used to heat or cool the zones and change the roll diameter by zone.
Below is a transcript of the video sample provided for this module:
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