Vacuum Drum Washer

Vacuum Drum Washer

Vacuum drum washer is a set of necessary washing equipment for bleaching section and extraction section just like wood pulp, straw pulp and other pulps. It is key technological equipment for paper making industry to solve the problems of waste water pollution and carry out alkali recovery project.


Vacuum drum washer mainly includes drum, tank body, plane distribution valve, washing equipment, pulp stripping equipment, screen-washing equipment, screw conveyor, etc. It can be applied in the form of single or multi series. When the drum turns one circle, drum washer can implement three processes including filtration, washing and stripping.

The surface of washer drum can be classified into several compartments. Each is linked with the corresponding part of valve seat through filtrate flow. The whole drum surface can be divided into the empty zone, venting zone and stripping zone by valve core. The drum can rotate in tank, and it contains pulp. The pulp goes through the drain vent and passes vacuum filtration zone, stripping zone and venting zone. Through vacuum suction, the liquor is pumped out of flow path and the distribution valve of the filtrate in the pulp. The pulp is adsorbed on the outer surface of the drum body and stripped off by the blade to achieve the suction, stripping and exhausting processes of the pulp

vacuum drum washer


There are many vacuum drum washer manufacturers in China. They can provide advanced products. Compared to other kinds of washer, vacuum drum washer can produce pulp with low residual alkaline and high extraction rate of black liquor, which prompts the development of alkaline recovery and control the pollution of black liquor greatly.

Vacuum drum washers AGICO produced have the features of mature technology, stable running, simple operation, good performance and so on.

Vacuum drum washer we offer

Model /ItemDrum length (mm)Drum Dia. (mm)Drum speed (rpm)Feed Consistency(%) Discharge Consistency (%)Capacity( black liquor extraction)(Kt/m2.d)
Straw /Bagasse pulpBamboo pulpWood pulp
vacuum drum washers

Common specifications

Single production capacity depicts as follows: wood pulp 100-600t/d; bamboo pulp 75-400t/d; wheat straw pulp 50-180t/d

Multi series of washer production capacity depicts as follows:

Air-dried wheat straw pulp: 1-1.5t/m2.d; air-dried pulp 1.5-2t/m2.d; air-dried wood pulp: 3-4t/m2.d. Vacuum degree: 0.01-0.03MPa. Drum speed: 0.8-3r/min

Pulp is a lignocellulosic fibrous material prepared by chemically or mechanically separating cellulose fibres from wood, fiber crops, waste paper, or rags. Many kinds of paper are made from wood with nothing else mixed into them. This includes newspapers, magazines and even toilet paper. Pulp is one of the most abundant raw materials.

A pulp mill is a manufacturing facility that converts wood chips or other plant fibre source into a thick fibre board which can be shipped to a paper mill for further processing. Pulp can be manufactured using mechanical, semi-chemical or fully chemical methods (kraft and sulfite processes). The finished product may be either bleached or non-bleached, depending on the customer requirements.

A paper machine (or paper-making machine) is an industrial machine which is used in the pulp and paper industry to create paper in large quantities at high speed. Modern paper-making machines are based on the principles of the Fourdrinier Machine, which uses a moving woven mesh to create a continuous paper web by filtering out the fibres held in a paper stock and producing a continuously moving wet mat of fibre. This is dried in the machine to produce a strong paper web.

The pulp produced up to this point in the process can be bleached to produce a white paper product. The chemicals used to bleach pulp have been a source of environmental concern, and recently the pulp industry has been using alternatives to chlorine, such as chlorine dioxide, oxygen, ozone and hydrogen peroxide.

Chemical pulp is produced by combining wood chips and chemicals in large vessels called digesters. There, heat and chemicals break down lignin, which binds cellulose fibres together, without seriously degrading the cellulose fibres. Chemical pulp is used for materials that need to be stronger or combined with mechanical pulps to give a product different characteristics. The kraft process is the dominant chemical pulping method, with the sulfite process second. Historically soda pulping was the first successful chemical pulping method.