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Status/ Cause / Countermeasures |
| 1 |
The surface is rugged and not glossed. The material was wrongly selected and cannot resist solvents or chemicals.
In selecting materials, use conditions, solvent resistance and chemical resistance should be checked, and
re-coating is required before use. |
| 2 |
Fine cracks occur across the surface.
This happens when long preserved in appropriate conditions (For instance, when kept long in places with sunlight)
Upon finding, immediately conduct polishing. |
| 3 |
Deep cracks occur across the surface
This happens when a roll with fine cracks is used and thus is aged by ozone and heat.
Either polish or re-coat. |
| 4 |
Cracks occur partially.
The load is uneven and the crown does not fit well.
Improve the machine to balance the load.
Correct and re-polish the roll crown. |
| 5 |
Parting occurs between rubber iron cores at both end sections.
This happens when the bearing lubrication is not good thus generating heat, or when the crown is in shortage thus giving load only to both ends.
Do taper processing or correct, polish and complement the crown. |
| 6 |
Parted parts occur across the surface.
This happens when excessive load or long-time use at high temperatures cause the contact layers to age and flake off.
Rolls appropriate for load should be used, and in case excessive heat is caused up to the contact layers,
re-coating should be conducted to water-cool the iron core inside. |
| 7 |
In case, with one side weighed down by the load, the machine is made to stop, or the machine is long kept while being weighed down by another object.
Give a short pre-heat in the heat capacity and heating pipe, reinstate the pressed part and polish. |
| 8 |
The overall rugged surface occurs when chemicals are deposited or shaking causes abnormal abrasion.
Recheck the balance to give appropriate repairs, and repolish or re-coat. |
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