| Customization: | Available |
|---|---|
| After-sales Service: | Warranty |
| Warranty: | 1 Year |
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Doctor blade is a common mechanical device in paper machine, which can be divided into two types: one is the blade used for cleaning such as rolls (including the roller of net / press section, dryer cylinder ); the other is functional doctor blade, such as coating blade and creping doctor.
When used for guide roller cleaning and in conjunction with the spray system, the blade is an effective tool to keep the fabric clean, as most of the machine surface contaminants are transferred from the fabric to the smooth roller. Doctor blade are often used to remove these contaminants to prevent the accumulation and re contamination of contaminants or damage to fabrics.
The blade removes contaminants and water from the roller / dryer surface by holding the blade in a fixed position and swinging back and forth under the same pressure, such as swinging on the smooth press roll to remove debris due to paper surface breakage.
Although the doctor blade seems to be a set of simple paper machine equipment, and the investment is not large, its role is not small at all. It can keep the paper machine rollers and fabrics (forming fabric, press felt, dry fabric, etc.) clean, extend the cleaning cycle and fabric service life of the paper machine, maintain the normal operation of the paper machine and the stability of paper quality, so as to produce huge benefits.
Once in the maintenance period, the doctor blade is usually easily ignored. But some simple routine maintenance can keep the equipment running efficiently.One of the most effective ways to check the same problem is to check the blade with vision. The following table shows the different types of blade wear and the corresponding treatment methods. This inspection method is very effective.
| Problem | Reason | Measure |
| Uneven wear, frequent blade replacement | 1. The surface of roller or dryer is uneven 2. The doctor holder is damaged or dirty 3. Sediment |
1. Use a softer blade 2. Clean, repair or replace the doctor holder 3. Use abrasive blade |
| Excessive wear on middle or edge of blade | 1. The blade is not installed on the top of the roller 2. The old blade sinks (or leaves) the roller or dryer |
1. Refit or add gasket at the back of blade if necessary 2. Replace the old and sunken blade |
| Excessive wear at one end of blade | The displacement of blade is not parallel to the axial direction of roller or dryer | Add gasket, if necessary, move bearing and bracket to adjust scraper parallel to axial direction |
| The blade is worn evenly, but the end face is rough | 1. There is deposit on the surface of roller or dryer 2. The pressure of blade is too high 3. The material of blade is too hard |
1. Use abrasive blade when necessary 2. Reduce the pressure 3. Use a slightly soft blade |
| Excessive wear in sheet area | The sheet leaves sediment on the roller or dryer | 1. Use abrasive blade when necessary 2. Trim the edge of blade frequently 3. Use blade with slotted end to prevent excessive pressure on both ends of roller or dryer |
| Excessive wear out of sheet area | The sheet lubricates the roller or dryer | Use blade with slotted end |
| Local depression | The blade is damaged, electrostatic (discharge/ electrolysis /heating) | Insulate the blade from the holder or use a non-metallic blade |
| The blade produces burr | 1.The material of the blade is too soft 2. The pressure is too high 3. The angle of the blade is too small |
1. Use a slightly hard scraper 2. Reduce the pressure 3. Adjust the bearing or bracket to increase the angle, and use the instrument to check and correct the angle |
The first very effective routine is to change the blade as often as necessary. When the blade is worn, the angle between the blade and the roller will change, thus reducing the cleaning efficiency of the blade. When the width of the blade is worn by 6 mm to 12 mm, the blade needs to be replaced.
The second important component that needs to be paid attention to is the doctor holder. Any damage to the doctor holder will affect the pressure between the blade and the roller, and the damaged doctor holder should be replaced in time.
During each inspection, the pressure device and swing device in operation should be carefully checked. When defects are found, they should be repaired.
| Name | SH-2C--Carbon fiber blade |
| Major uses | Suitable for ceramic rolls, dryer rolls, ebonite rolls. |
| Key Features | Carton fiber 20%. Epoxy-glass fiber, with better lubricity and anti-abrasion. |
| Temperature resistance | Temperature resistance |
| Bending strength | 600N/mm2 |
| We also have carbon fiber 40%, carbon fiber 60% and carbon fiber 100% for your choose. | |
| Name | HDPE-1--Polymer blade |
| Major uses | Suitable for rubber rolls in wet end and polyester rubber rolls. |
| Key Features | Advanced composite material of macro molecular polyethylene. |
| Temperature resistance | over 80 centigrade |
| Bending strength | 3 million |
| Name | HDPE-2--Polymer blade |
| Major uses | Suitable for rubber rolls in wet end and polyester rubber rolls. |
| Key Features | Molecular polyethylene: promoting lubricity blade and suitable for the wet end. |
| Temperature resistance | over 80 centigrade |
| Bending strength | 6 million |
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