Calendering - Hard Nip

SKU: C-672Duration: 23 Minutes Certificate Included

Pay-per-view (PPV) format perfect for individual users.

Get immediate access to this interactive eLearning course online. Must be used within 30 days, expires 48 hours after launch.

Language:  

Great for in-person classroom training or as an alternative to DVD.

Includes printable documents and Convergence Video Player for Windows systems. Content expires after 1 year.

Language:  

Ideal for corporate licensing and volume users who also need administrative tracking and reporting on training.

Get this interactive eLearning course into your LMS or learn how you can leverage our LMS to deliver training to your workforce.

Need multiple courses or have lots of users? Just let us know a little more about what you need and we’ll get you some great volume pricing.

 Need help deciding? Compare delivery formats.

Course Details

Specs

Training Time: 23 minutes

Compatibility: Desktop, Tablet, Phone

Based on: Industry Standards and Best Practices

Languages: English, Portuguese
 Multiple languages available for USB and Enterprise (SCORM/AICC) formats. Contact us for more info.

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.

Learning Objectives

At the end of this module, you will be able to:

  • Describe the purpose of hard nip calendaring
  • Identify sheet and calender operating variables that affect calendering
  • Describe the differences between single-nip and multi-nip calender stacks
  • Identify the safety hazards associated with calender stacks
  • Identify and describe the main components of a hard nip calendar
  • Explain how roll deflection can be used to control the caliper profile of the sheet
  • Explain how zone profiling can be used to adjust the caliper profile of the sheet

Key Questions

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.

Sample Video Transcript

Below is a transcript of the video sample provided for this module:

On single-nip calenders, operators typically have control of three parameters to adjust nip pressure profiles: the front load, back load, and crown deflection. The front and back loads create the overall nip load, while the crown deflection affects the nip pressure profile. These three parameters can be used to control the caliper profile of the sheet as follows. If both edges are soft at the reel because the caliper is low on the edges, increasing the roll deflection will increase the caliper at both edges without changing the overall nip load. Conversely, if both edges are hard, the roll deflection can be reduced.

Customer Q&A

Ask a Question

Sorry, we're missing some information

I would like to have several employees take multiple courses. How can I set that up?

We're in the process of making bulk course and multiple user purchases easier. But for now, you can order multiple courses and contact us with details on who you'd like to assign courses to. We can set up each user's training plan and make sure everyone gets the eLearning assignments they need.

Can I get a free full-length preview of a course to see what this course covers?

While we do our best to offer details on course contents, we don't normally offer full-length previews. But please contact us with more details for a better understanding of what your organizaton needs and how we can help.

Do I get a certificate when I complete a course?

Yes. All of our courses allow you to print a completion certficate upon successfully passing the integrated test at the end of each eLearning course.

How do I log in to take a course that I have already paid for?

You'll receive an email with login details moments after you purchase your pay-per-view (PPV) course. Just click the login link and enter the user name and password provided.

Do you have courses in different languages?

Yes. While all of our courses are originally produced in English, we develop many courses in a growing number of languages, including Chinese, Dutch, German, Italian, Japanese, Korean, Polish, Portuguese, Russian, Spanish, Tamil, and Thai. Available languages are normally displayed in the Course Details section on each course page.
Added to Cart! Click here to view your cart.