Features
1. UV Waterman is a dampening roller for both UV and oil-based inks.
2. UV Waterman can achieve small contact angle. (Excellent hydrophilicity).
3. Excellent dimensional stability.
4. Tough surface strength
5. Less UV ink-accumulation
Hardness and Color
1. Hardness 25, 30 (Shore A)
2. Color Blue-violet
Physical Data
1. Wetting property
| Rubber grade | Contact angle | ||
|---|---|---|---|
| After 20 sec. | After 60 sec. | After 120 sec. | |
| UVW-25 | 52 | 36 | N/A |
| New W4-25 | 71 | 57 | 45 |
| UV-25 | 101 | 99 | 98 |
* Test machine... FACE contact-angle meter type CA-D(Kyowa Kaimen Kagaku Co.)
* Test method: Clean the sample surface with white gasoline. After the surface is dried apply 0.1cc of water onto it and measure the contact angle in every certain second.
2. Resistance to alcohol contained solution
| Rubber grade | After 1 day | 3 days | 9 days | 24 days | 29 days |
|---|---|---|---|---|---|
| UVW-25 | 2 | 3 | 5 | 7 | 8 |
| New W4-25 | 1 | 2 | 3 | 5 | 6 |
| UV-25 | 1 | 1 | 2 | 4 | 4 |
* The figures show weight-change ratio(%). As the figure is closer to "0", theresistance is better.
* Test method: Immerse 5 gram each of cubic rubber samples into 7% alcohol contained solution and weigh it in every certain days.
3. Resistance to UV ink
| Rubber grade | After 1 day | 3 days | 9 days | 24 days | 29 days |
|---|---|---|---|---|---|
| UVW-25 | 1 | 1 | 2 | 2 | 3 |
| New W4-25 | 2 | 3 | 5 | 7 | 8 |
| UV-25 | 1 | 1 | 1 | 2 | 3 |
* The figures show weight-change ratio(%). As the figure is closer to "0", the resistance is better.
* Test method: Immerse 5 gram each of cubic rubber samples into the UV ink and weigh it in every certain days.
4. Resistance to oil-based ink
| Rubber grade | After 1 day | 3 days | 9 days | 24 days | 29 days |
|---|---|---|---|---|---|
| UVW-25 | -1 | -1 | -2 | -3 | -4 |
| New W4-25 | 0 | -1 | -1 | -1 | -2 |
| UV-25 | -1 | -2 | -3 | -4 | -5 |
* The figures show weight-change ratio(%). As the figure is closer to "0", the resistance is better.
* Test method: Immerse 5 gram each of cubic rubber samples into the oil-based ink and weigh it in every certain days.