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Why Printing Rollers are Critical to Printing Quality?
Given that the technology of a printing unit is fixed by the machine, the quality of printing depends on
(a) the quality of paper
(b) the quality of ink
(c) the quality of the rubber rollers.
It's no wonder that the printing roller is considered the heart of the printing machine. For a printer, it represents less than 0.1% his costs but contributes around 25% to the quality of printing. The bottom line is you save a lot of money if you take care of your rollers.
HARDNESS CHART FOR OFFSET ROLLERS
| Roller Type |
Hardness for Sheet feed o Sh A |
Hardness for Web Offset o Sh A |
| Damping (Water forme & Water duct) - Standard |
25 |
25 |
| Gummi |
23 |
25 |
| Gummi |
30 |
35 |
| Ink forme -Standard |
32 |
35 |
| Ink duct & Ink distributor |
35 |
38 |
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SPECIAL ROLLERS
If you need any special rollers for particular applications, please give us the required information like
- Hardness
- Length & Diameter of Rubber and the metal core
- Temperature in application of the roller (During use)
- Any Solvents coming in contact with the rubber
This will enable us to choose the best polymer to optimize your performance parameters.
Click here to send us the information for special rollers. |
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| Type |
Hardness Sh A |
Important Properties |
| Letter Press |
25 |
- Softness
- Should not cut easily
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| Offset inking |
32 |
- Receptivity to ink and resistance to ink & to cleaning agents
- Resilience
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| Offset Damping |
25 |
- Resilience
- Resistance to alcohol & to water
- Minimum swell
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| Lamination |
55-60 |
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| Flexo |
65-70 |
- Resistance to liquid flexo inks with toluene base
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| Gravure |
75-80 |
- Resistance to gravure inks
- Abrasion resistance
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Metal Print
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35 |
- Abrasion resistance
- 25mm thick rubber
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Food Grade
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OUR NORMAL MANUFACTURING TOLERANCES
On Length of rubber |
± 0.1 mm |
| On Diameter of rubber |
± 0.2 mm |
| On Taper per meter length |
0.05 mm |
| On Runout between rubber & journal area |
0.03 mm |
| On Hardness |
± 3 o sh A |
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