Reasonable doctor blade technology is very important in industrial processing applications. Reasonable doctor blade technology far exceeds the choice of the doctor blade. Scraper fixtures are also very important. The clamp must be able to reasonably position the scraper blade so that it closely adheres to the roller. To a certain extent, it can accept and accommodate the irregularity of the roller surface. It can be adjusted according to different thermal expansion degrees to facilitate frequent blade replacement. Kadant's solutions provide a full range of doctor fixtures for most roller positioning and applications
Blade type doctor assemblies typically consist of a support beam and blade which span the length of the roll face.
Whenever the roll nip is closed and rotating, the blade should be loaded against the roll. Where applicable, the entire doctor assembly should be oscillating in a cross machine direction. This oscillation promotes a more uniform wear on the roll and blade.
The Gravity type doctor blade also called as the self-weight doctor blade holder. It is the simplest doctor blade holder at present. It depends on its own gravity to determine the Angle. It can not be moved or adjusted in the process of use.
| Product | K35 Gravity type Doctor blade holder |
| Material | Stainless Steel / Aluminum / Composite / Carbon Fiber |
| Hardness | 1960N/mm(580HV+/-15) |
| Edge height | 1.3mm |
| Blade height | 10-60mm |
| Service life | 3months-9 months |
Double airbag single doctor blade holder
The air bag can make the contact of the blade and the roller at any point is very balanced, preventing the roller from being scratched.
Adjust the pressure of the air supply through the pressure reducing valve, so that the line pressure can be effectively controlled.
The thickness of the blade can be freely selected from 1mm to 6mm, and the blade replacement is convenient.
Install double doctor blade holder in the center press section and net section rolls. Due to the centrifugal force, the water and fine fibers in the hole of the vacuum pressure roller will not flow out and adhere to the roller doctor blade to destroy its surface tension, remove some water and fine fibers, and form a tiny negative pressure after the doctor blade to remove the water in the hole. After the fiber is completely discharged, it is cleaned by the second doctor blade.
Prevent the net from regaining moisture and improve the dryness of the net. Experience has shown that after the vacuum roll uses pneumatic tire pressurized double doctor blade holder, the paper output dryness of the wire can be increased by 10-25%, and the investment cost can be recovered in a short time. At the same time, it can ensure the cleaning in the roll hole and the water content of the paper banner of the wire. Uniformity; the use of pneumatic tire pressure double doctor blade holder on the right roller of the press can thoroughly clean the water and fine fibers on the roller surface to prevent paper breaks and paper defects.
The double doctor blade holder is divided into ABCD double doctor blade holder and ABC CM type double doctor blade holder. We will design according to the customer's specific situation and provide customers with choices.
The choice of Yankee type wrinkle doctor blade holder using ABC / SST air bag type doctor blade holder fixture. The oil-pressure pipe within the holder can prevent the holder from deforming.
It can be well attached to the blade, thus offering a good stability. Besides, it uses a low lineal pressure, and produces a high cleaning efficiency. The use of air-bag blade holder enables the roller to fully contact with the blade, thus offering a favorable flexibility. No fine tuning is required. In addition, the blade is of good rigidity, and corrugates stably.
The blade is made of SK material, and the fixture is of stepped structure.The blade is in range of wear. No detailed adjustments are required.
Moreover, the doctor blade holder has good rigidity and stable wrinkling. It can stably provide the 1500~3500N/m line pressure required for wrinkling.