The composition and function of the paper machine doctor blade

Paper machine doctor blade is generally composed of doctor blade seat , doctor blade holder, pressurizing/lifting device, swinging device, doctor blade, etc.Also some accessories such as bearings and journals.

The hardness of doctor blade holder must be calculated, designed and produced very strictly. This structure requires that the doctor blade holder and the doctor blade be supported in the appropriate position. According different using position,it requires different material doctor blade in order to adapt the using environment.

At the same time, it is necessary to design the cross section of the doctor blade base according to different paper machine widths. For a complicated triangle or four-corner section welding, any angle must ensure that the overall deviation is not greater than 12 mm. The scraper holder also includes different structures according to the use position. For example, the doctor blade used in the return roll and press roll, the shovel, the white water collection tray and the pipe are also the main components.

The doctor blade holder is the part that keeps the doctor blade in its operating position. The doctor blade holder must have an appropriate design to make the blade easy to install and remove, and to fix the doctor blade in place. There are many types of doctor blade holders, two of which are commonly used. One is manual operate,after being fixed, it cannot be adjusted automatically when the contact surface changes. The second type is a flexible or self-adjusting doctor blade holder. This structure can be automatically adjusted when the position of the doctor blade seat changes or the pressure changes. The air tube is filled with hydraulic pressure or compressed air. The air tube provides sufficient flexibility to change according to the contact surface.