Complaint
Leizhan offers a comprehensive range of doctor blades for all types of machine positions and process needs. The continuous testing of blade materials and development of blades ensures the reliability and high quality of our doctor blades.
All our blades are ranged according to their functionality. Economy range blades are designed to meet today's quality demands at competitive prices. Doctor blades in the Durability range are designed for maximum blade lifetime. The Performance range includes blades with specific superior features like low friction, high heat resistance or effective cleaning properties.
| Material | HDPE--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. |
| Molecular weight | 6 million. |
| Material | EP/Resin blade |
| Major uses | Suitable for all rolls from mesh fabric to automatic paper-reel. |
| Key Features | Microfiber and epoxy fiber, with very good chemical resistance. |
| Temperature resistance | 185 centigrade. |
| Material | 2C--Carbon fiber blade |
| Major uses | Suitable for ceramic rolls, dryer rolls, ebonite rolls. |
| Key Features | Carton fiber 20%. Epo-glass fiber, with better lubricity and anti-abrasion. |
| Temperature resistance | 185 centigrade. |
| Bending strength | 600N/mm2. |
| Material | 4C-Carbon fiber blade |
| Major uses | Suitable for drying rolls with stickies. |
| Key Features | Epo-glass fiber, ultra-fine fibre glass and super-fine carbon grinding. Chemical-resistance: very good. |
| Temperature resistance | 185 centigrade. |
| Bending strength | 760N/mm2. |
| Material | 100C--Carbon fiber blade |
| Major uses | Suitable for ceramic rolls, dryer rolls, Ebonite rolls. |
| Key Features | Carton fiber 60%. It is made of Epo-glass fiber, with good lubricity and anti-abrasion. |
| Temperature resistance | 185 centigrade. |
| Bending strength | 790N/mm2. |
| 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 |
LEIZHAN is a China Based engineering company and machinery supplier committed to offer complate solution and provide high-cost-performance equipments related to stock preparation and paper-making industry. With advantage technology and excellent equipment,we provide one-stop service from consultation,process design and optimization,manufacture,installation,commissing and personnel training and so on. At the same time,we can supply all kinds of stock preparation and paper making equipment and accessories.
For years,we have insisted on taking customer's value as our center and having strict quality-control and innovation in the whole process.
Our products have reliable quality and superior performance and have been exported to Poland,Greece,Turkey,Iran,India,Packistan,Bangladesh,Thailand,Indonesia,Philippines,Malaysia,Vietnam,Mexico,Guatemala,Costa Rica,Columbia,Egypt etc.
We have established long-term cooperation relationship with many paper mills and agent.
Honesty,cooperation and win-win are important to us.We insisted on serve our customers with high quality products,sincere service and good reputation.We are appreciated for the long-term trust and favor from our customers.Hope we can cooperate sincerely and make progress together with our new and old customer.
