Abstract:
Nipped rollers are the most common method to create high pressure many value-adding web processing, including coating, printing, laminating, winding, and embossing. Nipped rollers are also commonly used to prevent air lubrication in heating, cooling, corona treating, and tension control driven rollers.
In most cases, the goal of a nipped roller system is to provide uniform pressure across the web?s width, but diameter variations, hardness variations, misalignment, deflection, web thickness variations, and uneven loading can all lead to undesired pressure distributions and a variety of defects. Understanding the root causes of these defects and their common remedies can quickly improve your profitability.
The goal of this workshop is to show how to improve your roll and web quality through a better understanding of the winding process, winder design, and roll measurements. Unlike any other option in web handling education, the AIMCAL series of web handling ?workshops? are one-of-a-kind training that combines classroom seminars with on-machine demonstrations. Who will benefit from this workshop?
This workshop is directed towards technical employees of any level with a need to understand the fundamentals of nipped roller systems. Though the seminar will include some engineering theory and equations, the workshop?s goal is to show how theory and experiment lead to practical solutions to common problems. Seminar Outline:
The workshop will aim for a 50-50 split between seminar and lab demonstration time. Seminar topics will include all the background needed to understand the lab demonstrations and more, including:
- Nipping system design - How do you choose the right compound and geometry for your process? What are the best ways to align nip rollers? What is the best way to control nip load?
- Nip roller pressure - What is the pressure between nipped rollers? How is it measured? What are the most common causes of pressure variations? What are problem caused by pressure variations?
- Wrinkling and lateral control - Can uneven nip loading cause lateral shifting of the web? Why do so many wrinkles occur at nipped rollers? What are the most common remedies by root cause?
- Driving and tensioning - What is the best practices in driving nipped rollers? How does nipped roller load affect tension control?
Laminating and curl - What causes curl in laminates? What how does nipped roller system design and geometry affect curl?
Lab Demonstrations:
Lab #1 - Measuring nip footprint and pressure uniformity
Learn both simple and advance methods for measuring nip uniformity.
Lab #2 - Measuring lateral motion and creating wrinkles from uneven nipping
See how uneven nipping will shift the web laterally and create wrinkles. Spreading and adjustable rollers will be demonstrated and evaluated for their ability to compensate for uneven nipping.
Lab #3 - Baggy webs and nips
See how baggy web and nipped roller create wrinkles. Tension, spreading, and adjustable roller will be demonstrated and evaluated for their ability to compensate for baggy web and nips.
Lab #4 - Process speed variations and nip loads
Measure the web speed variations as a function of nip roller design and load.
Lab #5 - Curl induced by nip roller systems In simple dry lamination, see how curl is a function of material properties, pre-laminating tension, and web path geometry.
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