FAQ

The cost of roller refurbishment depends on several factors such as:

• roller dimensions (rubber diameter / core diameter / rubber length)
• type of rubber used (depends on the function of roller in machine and working conditions of roller)

After receiving above-mentioned information, we can estimate the cost of roller refurbishment

Rubber, polyurethane and silicone rollers

• roller dimensions (rubber diameter / core diameter / rubber length)
• function of roller in machine and working conditions (contact with chemicals, working temperature, other important information)
• coating hardness

Chrome rollers

• roller dimensions (roller diameter / working length)
• chrome layer required
  type of surface (ground / polished)

To estimate cost of making a new roller, drawing of roller or reference roller is required.

For an estimate, all we need is a hand-drawn sketch with the dimensions (approximate dimensions) + photos of roller with estimated dimensions roller.

In both cases, information about function of roller in machine and operating conditions are also necessary.

• rubberizing of roller or sleeve: 10-12 business days
• grinding roller or rubber sleeve – 5 working days, it is possible to perform grinding “immediately” after delivery after prior arrangement of delivery date.
• new rubber sleeves: depending on availability, 5-15 business days

*we can have on stock sleeves for customer, shipping upon request within 5 business days (smooth sleeve), 10-12 business days for engraved sleeve

• chrome plating: 5-6 weeks
• new steel or aluminium roller – 20-25 business days

Rubberizing and grinding of rubber rollers:
Max diameter D 600 mm / working length L 4900 mm / total length L 5500 mm

New steel rollers:
Max diameter D 600 mm / total length L 4000 mm

Chrome plating of rollers:
Max diameter D 600 mm / working length L 6000 mm

1a. Customer inquiry –> offer–> order –> roller delivery to Remdruk

OR

1b. Roller delivery to Remdruk –> roller measurements and offer –> order

2. Roller inspection:

• measuring the diameter and length of roller,
• measurement of rubber hardness,
• measurement of bearing places, journals
• checking of condition of steel core

3. When we find irregularities, e.g. damaged bearing, customer receives information for approval regarding possible repair costs. After accepting of offer conditions, roller goes into production and the following occurs:

• removing of old rubber coating
• roller shot blasting
• degreasing roller surface
• applying primer and glue and drying
• winding and bandaging rubber
• curing
• rubber cooling
• turning, rubber cutting and grinding to nominal diameter
• inspection and packaging
• collection of roller by the customer or shipping with our carrier

Storage Temperature

• Maintain the storage temperature within the range of 10°C to 25°C. (Depending on the roller’s function in the machine and the precision of work requirements, this temperature may vary slightly and deviations from the given range are permissible)
• Avoid extreme temperatures and sudden temperature changes.

Humidity Control

• Maintain a low level of humidity to prevent corrosion and damage to the roller.
• Avoid condensation and direct contact with water.

Protection from Light

• Protect from direct sunlight and UV light, which can accelerate the degradation of rubber.
• Store rollers in a dark place or use covers to protect them from light.

Avoiding Heat Sources

• Do not store rollers near heaters, furnaces, or other heat sources.

Roller Position During Storage

• Store rollers horizontally on racks or in crates, suspend them by the roller shafts or bearings.
• Avoid storing rollers in a lying down position (on the rubber). If necessary, place the roller on foam or sponge and rotate it 180° periodically. Ensure the weight of the roller is evenly distributed in such cases.

Protection from Contamination

• Store rollers in a clean place, away from dust, dirt, and chemicals.
• Consider using protective covers to prevent direct contact with contaminants.
• Caution During Transportation
  Use appropriate tools and techniques when moving rollers to avoid mechanical damage. Transport rollers in crates or on pallets.
• Avoid excessive pressure and impacts.
• Always attach lifting straps to the steel part in such a way that they do not come into contact with the rubber.

Preventing Contact with Oils and Solvents

• Do not store rollers near substances that could damage the rubber, such as oils, gasoline, solvents.

Grinding of Rollers

• After a period of prolonged storage, it may be necessary to refresh the rubber surface. This can be done by grinding the rubber, provided the minimum diameter of the roller allows for it.

Depending on type of rubber compound on roller, it is important to differentiate type of chemical agents used for cleaning.

✔ To clean rubber rollers, it is the best to use a soft, non-linting cloth that does not leave any residue or fibers on rubber surface.

1️⃣ EPDM

✔ Characteristics: Resistant to ozone, alcohol, acids, bases, weather, and water.
✔ Recommended Cleaning Agents: Mild detergents, water. Alcohol or solvents can be used with caution, but care should be taken to avoid exposing of rubber to prolonged contact with aggressive chemicals.
❌ Avoid: Petroleum-based products. Oils, gasoline, greases can cause swelling and degradation of EPDM. High concentrations of acids and bases are not recommended.

❗A common practice when cleaning hard-to-remove stains such as adhesives is using of ethyl acetate. If done skilfully, i.e., not directly pouring acetate on roller but cleaning rubber with cloth moistened with acetate so that it can evaporate quickly, this method is possible and, most importantly, effective. Prolonged exposure of rubber to ethyl acetate, as well as inadequate cleaning of rollers and leaving adhesive residues on roller, can lead to rapid degradation of rubber and loss of its properties.

2️⃣ NBR

✔ Characteristics: Good resistance to oils, hydrocarbons, and fuels, moderate resistance to some solvents and weak bases.
✔ Recommended Cleaning Agents: Soap and water.
❌ Avoid: Acetone, aromatic solvents.

3️⃣ NR

✔ Characteristics: Sensitive to ozone, fats, solvents.
✔ Recommended Cleaning Agents: Water with a gentle detergent.
❌ Avoid: Solvents, petroleum-based products.

4️⃣ Hypalon – CSM

✔ Characteristics: Very good resistance to ozone, UV. Good resistance to oils, acids, and solvents.
✔ Recommended Cleaning Agents: Similar to EPDM, alcohol or solvents can be used with caution, but care should be taken to avoid exposing rubber to prolonged contact with aggressive chemicals.
❌ Avoid: Aromatic hydrocarbons, highly concentrated acids and bases.

❗ Cleaning from adhesives –same as with EPDM rubbers.

5️⃣ Silikon

✔ Characteristics: Resistant to temperature, ozone, water, steam, and UV.
✔ Recommended Cleaning Agents: Mild cleaning agents.
❌Avoid: Strong acids, bases, oils, and greases.

6️⃣ Poliuretan

✔ Characteristics: Good resistance to mineral oils, greases, and fats.
✔ Recommended Cleaning Agents: Water, mild detergents.
❌Avoid: Ketones, may be sensitive to certain organic solvents that can cause swelling or degradation.

✳ ✳ If minimum diameter of roller allows, rubber rollers can be ground not only in case of wear and mechanical damages but also in case of contamination or swelling of rubber.

❗ ❗ The information provided is general and may vary depending on the exact composition and quality of rubber and working conditions. For special applications, it is recommended to consult with manufacturer or make chemical resistance tests.