Sigma Eco is a high grade inking roller designed for Environmentally-friendly inks such as Non-aromatic inks and Vegetable-oil based inks as well as Conventional oil-based inks. Environmentally-friendly inks often have negative effects on rubber rollers such as diameter shrinkage, need of frequent nip-adjustment and shorter lifetime. Sigma Eco has overcome such problems.
Features
1. Excellent dimensional stability over time.
2. Excellent hardness-stability and glaze-resistance.
3. Extraordinary small heat build-up even in high speed runs.
4. Minimal changes in nip-width and ink viscosity, offering stable printing quality.
5. Highly resistant to widely used roller washing solutions.
Hardness
25,30,35,40 (Shore A)
Physical Properties
| ΣECO30 | ΣSOY30 | ΣKING30 | ΣECO25 | ||
|---|---|---|---|---|---|
| Color | Gray | Orange | Blue | Gray | |
| Hardness | Shore A | 30 | 30 | 31 | 25 |
| Stress | MPa | 0.5 | 0.5 | 0.5 | 0.3 |
| Tensile strength | MPa | 5.1 | 9.4 | 5.9 | 4.9 |
| Elongation | % | 670 | 840 | 720 | 790 |
| Tearing strength | N/mm | 9 | 14 | 15 | 9 |
| Heat buildup | °C | 16 | 18 | 17 | 16 |
*Heat buildup – Flexo test (Loading12 Pond, 40°C)
*Above is a representative value, not a standard value.
Dimensional and Hardness changes in the actual printing press
1 Working time: 8 hours, Measured roller position: F roller (Distributor roller)
Diameter shrinkage of Sigma Eco after 1 year is still less than 0.25mm and
Hardness increase is 4 degrees. There is no glazing and still offering stable
printing quality.
Comparison of weight-change rate
