The Importance of Tension Control in Corona Treatment

What is Corona Treatment?

A corona treater consists of a high voltage power supply and a treater station. Corona treatment is a surface modification technique using a high voltage discharge to increase the surface energy (dyne level) in plastics, cloth, paper, etc. Many of these products are non-porous with low surface tensions causing them to resist bonding with inks, adhesives and coatings. Corona treatment improves the dyne levels in the product to be treated, allowing high quality, consistent results, in an economical manner

           Corona Treater

Potential Problems

If product curling or wrinkling develops in the treater zone, an excessive air gap on the back side of the web can cause unintentional back-side treatment. This reduces the watt density on the side to be treated, lowering the products dyne level. The result is a finished product with inconsistent quality.

Potential Solution: Web Tension Control

Precise corona treatment depends on consistent web tension which, if not controlled properly, can hinder the process. Integrating a controller, load cells, and a brake on a treater line can often support corona treating at higher speeds, while reducing waste caused by curling or wrinkling.

Turn-key Corona Treater tension control systems typically incorporate:

  • A closed-loop tension controller such as the SteadyWeb 6 digital controller
  • A load cell roller such as the Tension Roll transducer
  • A Pneumatic Brake (unwind zone) OR
    • A Magnetic Particle Brake (unwind zone) OR
    A pneumatic or electric output to a clutch (intermediate or rewind zone) OR
    An electric output to a motor drive system (intermediate or rewind zone)

Customer integrating tension control with a PLC most often utilize:

 

 

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