Custom Corona Treatment Rollers
Corona treatment rollers are used in corona treating stations for film, paper, foil, and other web materials. They are commonly found before printing, coating, laminating, bonding, or other surface-sensitive processes.
These rollers may also be called corona rollers, corona treatment rollers, corona rubber covered rollers, or dielectric covered rollers, depending on the equipment design and roller position.
The main role of a corona treatment roller is to help the web pass through the high-voltage corona area in a stable way, while the roller surface provides the required insulation, cleanliness, ozone resistance, corona discharge resistance, and surface stability.
If you already have drawings, old rollers,or confirmed specifications, you can send them directly. If not, you can still start with the roller position, web material, and the problem you are seeing.
Suitable Lines and Applications
Corona treatment rollers are used by customers who operate, maintain, or replace rollers in corona treating equipment.
They are often required when a web material needs surface treatment before printing, coating, laminating, adhesive bonding, or further converting.
Common applications include:
- BOPP, PET, PE, CPP, and other packaging film corona treating lines
- Protective film, release film, functional film, and label material production
- Pre-treatment sections before film printing, coating, laminating, or bonding
- Paper, label stock, aluminum foil, copper foil, and other web surface treatment lines
- Replacement of old corona rollers with breakdown, aging, contamination, or surface marks
- Custom replacement projects where the original roller data is incomplete but the old roller or machine position is available
For customers who see problems around the corona treating area, such as unstable treatment results, roller breakdown, surface contamination, poor downstream adhesion, or different results after roller replacement, the corona treatment roller is often one of the key parts to check.
What a Corona Treatment Roller Does
Corona treatment is used to improve the surface condition of web materials, so that later printing, coating, laminating, or bonding can perform more consistently.
In this station, the corona treatment roller usually has three main functions:
| Function | Why It Matters |
|---|---|
| Supports the web through the treating area | Helps the material pass through the corona zone with stable running |
| Provides a dielectric or insulating cover | Reduces the risk of high-voltage breakdown, arcing, or discharge damage |
| Keeps the contact surface clean and stable | Helps reduce contamination, marks, and uneven treatment results |
A corona treatment roller is not just a normal support roller.
It must meet both mechanical running requirements and electrical environment requirements.
Why Corona Rollers Need Special Roller Covers
The corona treating area may involve high voltage, high-frequency discharge, ozone, static electricity, heat, and strict surface consistency requirements.
Because of this, the roller cover needs to be selected more carefully than a general rubber covered roller.
| Key Requirement | What Needs to Be Considered |
|---|---|
| Dielectric strength | The cover must resist high-voltage breakdown |
| Corona discharge resistance | The surface should remain stable near the discharge area |
| Ozone resistance | The cover should resist cracking, chalking, hardening, and aging |
| Cover thickness | The thickness should match the machine voltage, roller structure, and application |
| Surface condition | Bubbles, impurities, pinholes, dents, or local damage can increase breakdown and mark risks |
| Clean surface performance | Dust, oil, adhesive residue, or build-up may affect treatment consistency |
| Running accuracy | Runout, concentricity, and surface condition can affect stable running at line speed |
For this roller position, the key point is simple:
the roller must keep its insulating, clean, smooth, and stable surface condition during long-term operation in the corona treating environment.
Common Materials, Hardness, and Technical Direction
Corona treatment rollers commonly use silicone, dielectric rubber covers, insulating rubber, corona-resistant materials, or other cover materials based on the machine design.
The final selection depends on the equipment voltage, roller position, roller diameter, face length, web width, line speed, original roller structure, and current failure mode.
| Item | Common Direction |
|---|---|
| Cover material | Silicone, dielectric rubber, insulating rubber, corona-resistant cover material |
| Hardness | Common silicone sleeve and cover directions are often around 60–80 Shore A, depending on the equipment and contact condition |
| Cover thickness | Common cover or sleeve thickness can be around 2–4 mm, with custom thickness available according to the original roller structure |
| Dielectric strength | Some corona silicone sleeve directions are commonly specified around 18–22 kV/mm, 20 kV/mm, or similar equivalent electrical units |
| Temperature direction | Silicone is often used where heat, electrical environment, and elastic stability are all considered |
| Surface finish | Fine ground, low-marking, low-contamination, stable roundness, and good concentricity are usually important |
| Common risks | Breakdown, pinholes, arcing, ozone aging, surface contamination, and uneven treatment |
For corona treatment rollers, the material name alone is not enough.
The roller position, dielectric requirement, cover thickness, surface condition, and actual operating problem all need to match the corona treating station.
Common Problems
If the cover material, cover thickness, surface condition, or running accuracy is not suitable, a corona treatment roller may cause or contribute to problems such as:
- Roller cover breakdown or discharge damage
- Pinholes, local burning, or arcing marks on the cover
- Cover aging, cracking, hardening, chalking, or surface degradation
- Dust, oil, adhesive residue, or build-up on the roller surface
- Fine marks, indentation, or contamination points on the web
- Unstable adhesion after printing, coating, laminating, or bonding
- Different treatment results after replacing the old roller
- Web vibration or unstable running near the corona treating area
When the issue appears mainly before or after the corona treating station, the roller cover material, cover thickness, dielectric performance, surface condition, hardness, and running accuracy should be checked together.
Frequently Asked Questions
Common directions include silicone, dielectric rubber covers, insulating rubber, and corona-resistant cover materials. The right material depends on the equipment voltage, roller position, line speed, web surface requirement, cover thickness, and original roller structure.
The corona treating area involves high-voltage discharge. If the cover does not have suitable dielectric performance, the roller may face breakdown, discharge damage, pinholes, or unstable treatment results.
Not always. Some roller positions need an insulating or dielectric cover, while other positions may require anti-static or conductive properties. The correct direction depends on the roller’s position in the corona treating unit and the equipment requirement.
Not always. Marks may come from roller contamination, unsuitable hardness, surface defects, runout, another nip position, or a sensitive web material. If the marks appear around the corona treating section, the corona roller cover, surface condition, concentricity, and contact condition should be checked first.
Yes. If a complete drawing is not available, you can send old roller photos, roller diameter, face length, shaft dimensions, roller position, and the current problem. If hardness, cover thickness, machine model, or original roller data is available later, it can help confirm the replacement direction more accurately.
Request a Quote
If your corona treatment roller has breakdown, aging, contamination, indentation, surface marks, or unstable treatment results, you can send us the old roller information, drawing, or current machine problem.
We can help confirm the suitable cover material, hardness, cover thickness, surface finish, and replacement direction based on the roller position, web material, equipment requirement, and current issue.