Paper Machine Doctor Blade Functions and Holder Types
Main Functions and Components of Paper Machine Doctor Blade
The main function of doctor blade is to apply linear pressure along the width direction of the roller surface to achieve the purpose of cleaning the roller surface. The pressure of the scraper is mainly applied by the weight of the doctor blade holder itself or by selecting a suitable cylinder or torque module. The selection of different scraper racks and blades can have different cleaning effects on different types of roller surfaces. Doctor blade are mainly composed of blade body, blade clamp, moving device, fixed device, etc. They are divided into self weight type (KF doctor blade holder), pneumatic loading type, and torque spring type according to the loading form; According to the movement mode, it can be divided into fixed and moveable types, which are respectively used for different parts of the equipment and roller surfaces of different materials.
Types of Doctor Blade Holders
There are various types of doctor blade holders, such as the swinging blade holder, KF doctor blade holder, and DST blade holder.
The swinging blade holder can more effectively clean the roller surface and prevent the scraper from being pressed on the roller surface for a long time, protecting the roller surface.
KF doctor blade holder relies on the weight of the blade holder itself to apply pressure to the doctor blade, usually manually lifting and closing the blade. Some important parts can be remotely pressurized and lifted with a cylinder. The kf blade holder can adjust the pressure of the blade by fine-tuning the bolts of the scraper frame.
Pneumatic loading scraper, also known as DST blade holder, is widely used in various parts of equipment rollers. It adopts a full range airbag for overall pressure, making the scraper more evenly adhere to the roller surface, which can effectively clean the roller surface, reduce breakage, and improve the service life of the roller.
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Airbag Double Blade Holder Unique Advantage
Airbag type double scraper, some tiny dirt will run to the back of the scraper through the small gap between the roller surface and the doctor blade, some will be carried away by the strip tension, and some will stay on the back of the doctor blade and form blocks. When it falls off, it will cause pressure marks on the strip. At the same time, when the scraper line pressure is too high, negative pressure will be generated on the back of the blade, causing dirt to accumulate on the front of the blade, seriously affecting the quality of the paper. The dual scraper device can overcome the above disadvantages, solve problems such as line pressure, material, and angle that cannot be solved by a single scraper, ensure the cleanliness of the roller surface during operation, reduce breakage, and effectively protect the roller surface. Double doctor blade holder is mainly used for press rollers.
