Solo Systems, Inc.
4001 Industrial Street * Rowlett, TX 75088
800.259.5570 * 972.475.5569
In a successful, conventional treating system, the treater roll with its insulating coating
carries much of the burden of the process.  It performs three functions found to be critical
to dependable, high performance systems:

  1. Mechanically, the roll supports and guides the web accurately to help maintain a
    uniform air gap between the roll and the electrode.
  2. Electrically, the coating provides a non-conductive surface over which the corona is
    formed by the high voltage.
  3. Thermally, the roll acts as a sink to help dissipate heat from the coating and the rest of
    the system.

Therefore, based on our engineering studies and field experience, Solo Systems recommends
the following specifications for treater roll design and construction.

Mechanical Specifications:

  • Cores true to .002" TIR., .004" Taper.
  • Aluminum core construction for light weight, easy handling and efficient heat
  • Sufficient physical rigidity to prevent mechanical deflection during operation at
    specified line speeds and web tensions for accurate web guidance.
  • Rolls should be dynamically balanced.
  • Stainless steel shafts to resist corrosion.
  • Rolls should turn freely in the bearings.

Roll Coating Specifications:

Because it is the component most easily damaged and most often replaced, special attention
should be devoted to the choice of treater roll coating.  The coating material should
withstand high voltage and heat.  It must be mechanically durable and resist chemical attack
and ultra-violet erosion.

Irregularities in coating thickness can cause irregularities in treat on the web.  Low places on
the coating surface allow air to ionize under the web causing back treat.  A thin place draws
excess power to the area and shortens coating life.  An even coating gives an even
distribution of output power.  This increases coating life and provides consistent treat across
the web.

The choice of a coating vendor is as important as the choice of coating material.  Any
coating material will fail if not applied correctly on a good core.  Roll cores should be
inspected for straightness, taper, concentricity and trued to specifications before coating.

Solo Systems'
E-3 Epoxy roll coating is a high density, ceramic filled epoxy system which we
compound especially for corona treating applications.  Our proprietary method of
application ensures a non-porous, high density, void-free treater roll insulation.  Solo
Systems guarantees E-3 Epoxy treater roll coating for six months under normal usage or the
roll will be recoated at no charge.  Click this
link for more details on our E-3 Epoxy coating.

Roll Size Specifications:

Thermal stress on the treater roll and its coating is a main cause of system failure and down-
time.  Heat generated by corona discharge must be carried off to avoid overheating the roll
insulation or other parts of the system.  The main heat paths available are the electrode, the
web, the blanket of air carried by the web and the treater roll.

In the usual installation, the exhaust air required to remove ozone is ample for cooling
purposes if properly located, and if the treater roll has sufficient surface area to dissipate the
heat.  The slight extra cost of larger diameter treater rolls pays for itself shortly in reduced
downtime and extended roll coating life.

The graph below can be used to specify treater roll diameter.  Each bar in the graph
represents a roll diameter, diameters ( in inches ) are noted across the bottom of the chart.  
To read the graph, find your generator power rating and follow the diagonal line to its
intersection with your treat width.  The bar in which these lines intersect shows the roll
diameter recommended for your system.

Solo Systems' treaters are easy to order.  
We help you look at alternatives, plan for variables,
often in a single phone call!

Contact us today with your questions.
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