The corrugated roller is a vital component in the corrugated board production process.
It not only directly determines the quality of corrugated cardboard, but also one of the most frequently replaced and most expensive parts of the corrugated cardboard production line. It is called the "heart" of the corrugated cardboard production line.
When the corrugating roller works normally, the operating temperature of the key parts is above 180℃, and the instantaneous temperature can reach above 230℃.
Long-term exposure to high temperature, heavy load and water vapor. Therefore, it is necessary to use corrugator grease to lubricate and protect the equipment from corrosion.
Many grease manufacturers on the market use high dropping point as a publicity tool, claiming that the temperature resistance is as high as 300 ℃ or higher, but various problems often occur during actual use.
Because the lubricating grease at the corrugated roller is in a high temperature state for a long time, and at the same time it is subjected to shearing, it tends to decrease in consistency and easy to coke.
Therefore, the use of lubricating grease can not only focus on the temperature as an indicator, but requires comprehensive consideration before long-term use.
Common lubrication failure points of corrugated product production line:
1. Grease precipitation-flowing oil
The specific performance is: the consistency of the grease becomes thinner and flows out from the bearing.
Reason: The grease cannot withstand high temperature working conditions and shearing environment for a long time, the soap structure in the grease is destroyed, the oil soap separates, so it is softened and lost.
2. Grease carbon deposits-coking
The specific performance is: the bearing wears severely or directly locks up, similar to dry friction. After opening the bearing, it is found that the grease no longer exists in a semi-fluid state, instead it is black carbon deposits.
Reason: The oily substance in the lubricating grease undergoes chemical changes such as oxidation at high temperature, and the long-chain molecules are broken into short-chain molecules, and finally become carbides.
3. Insufficient lubrication capacity-wear and tear
The specific performance is as follows: During regular maintenance, there is semi-fluid grease on the bearing, but the bearing is seriously worn.
Reason: The lubricating capacity of grease is insufficient, and boundary lubrication or extreme pressure lubrication cannot be formed during friction. It is equivalent to that the grease does not have a lubricating effect or has a limited effect, and friction between the bearings is still in direct contact.
When the corrugating roller is working normally, the operating temperature of the key parts is above 180℃, and the instantaneous temperature can reach above 230℃.
Long-term exposure to high temperature, heavy load and water vapor. Therefore, it is necessary to use corrugator grease to lubricate and protect the equipment from corrosion.
Because the lubricating grease at the corrugated roller is in a high temperature state for a long time, and at the same time it is subjected to shearing, it tends to decrease in consistency and easy to coke.
Therefore, the use of lubricating grease can not only focus on temperature as an indicator, but requires comprehensive consideration before long-term use.
In view of the long-term working environment of the corrugated roller with high temperature, high load and moisture, in order to ensure its long-term operation and reduce downtime, the grease used should meet the following requirements:
1. High temperature resistance: meet at least 200 ℃ long-term work without loss.
2. Anti-oxidation: Good oxidation stability. Lubricants will not be oxidized quickly to form oxides in contact with air in a high temperature environment, avoiding the formation of carbides.
3. Anti-moisture: Grease will not emulsify and hydrolyze when exposed to water.
4. Shear resistance: When the grease is subjected to shearing for a long time during mechanical work, the soap fibers will separate and flow, and the structure of the grease will be unstable and the consistency will decrease.
