SILICONE ROLLER SLEEVE

Dielectric to avoid electrical short circuits

The dielectric prevents short circuits between the high-voltage electrode and counter-electrode, ensuring that the discharge energy is evenly distributed across the electrode’s entire width. For a homogeneous discharge pattern and high-quality surface treatment, the electrodes, and the dielectric between them, are specifically chosen for the treatment process.

From the user’s perspective, the primary criteria for a high-quality dielectric are reliability, short repair times, and cost-effectiveness. Silicone rubber meets these criteria and has become the material of choice worldwide. The silicone coatings used in Europe today are economical, durable, and suitable for the highest web speeds. Minor defects in a silicone sleeve can be repaired without removing the treater roll from the treatment station. Heavily damaged silicone sleeves are quickly and easily replaced at a low cost.

SOFTAL offers suitable replacement sleeves for all corona station variations.

REPLACEMENT ROLL

Carrier roller as a counter electrode for corona electrodes

In most corona treatment station designs, the treater roll serves as the electric counter electrode. Both the treater roll and the dielectric material on its surface significantly influence the formation and quality of the plasma discharge, thereby affecting the overall efficiency of the treatment process. A treater roll is always specifically chosen based on the individual application, taking into account the type of corona electrodes to be used and the properties of the material to be treated.

Besides the treater rolls included with our corona systems, SOFTAL allows customers to send in treater rolls for the renewal of damaged coatings or the repair of damaged roll journals. Naturally, SOFTAL also offers complete roll assemblies as spare parts.

When using a stainless steel treater roll, the dielectric becomes part of the corona electrode. As a result, stainless steel rolls are typically paired with ceramic electrodes. For corrosion protection, these stainless steel treater rolls are coated with conductive layers.

Silicone is the most commonly used coating material for treater rolls. The silicone coating serves as a dielectric, permitting the use of cost-effective steel electrodes, given that the material being treated is compatible with this combination. Minor defects in a silicone coating can be repaired without removing the treater roll from the treatment station. Heavily damaged silicone coatings can be replaced quickly, easily, and economically.

Rolls with a ceramic coating are utilized in special applications involving conductive webs. Ceramic-coated rolls are produced using a meticulous plasma coating process, placing them in a higher price segment than uncoated or silicone-coated rollers. The ceramic coating is durable enough to withstand any mechanical stress likely encountered during regular operation. Additionally, the ceramic coating serves as a dielectric.

Treater roll coating

Ceramic coating and silicone coated rollers

In most corona treatment station designs, the treater roll serves as the electric counter electrode. Both the treater roll and the dielectric material on its surface significantly influence the formation and quality of the plasma discharge, impacting the overall efficiency of the treatment process. Treater rolls are always chosen based on individual applications, with the type of corona electrodes and the properties of the material to be treated being pivotal in the selection.

Besides the treater rolls included with our corona systems, SOFTAL allows customers to send in treater rolls for the renewal of damaged coatings or for repairing damaged roll journals. Naturally, SOFTAL also provides complete roll assemblies as spare parts.

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