Twin Roll Press

Twin Roll Press

Twin roll press applies the displacement press principle to realize continuous dehydrating and washing of pulp. It is an important equipment of black liquor extracting and bleaching with advanced functions and technologies in the world. It fits for chemical pulp, chemical-mechanical pulp and waste paper pulp. Its performances are reliable, and the operation index reaches international advanced level. It can meet the requirements of the project with the annual 1.0-1.5 million tons output.

Twin roll press AGICO manufactured can be operated on a single machine and can be combined with multiple machines for large production scale of paper making mill.

Twin roll press we offer

Model /ItemDrum length (mm)Drum Dia. (mm)Drum Speed (rpm)Feed Consistency(%) Discharge Consistency (%)                          Production  Capacity
Straw / Bagasse pulpBamboo pulpWood pulp
press machine
twin roll press

Working Principle

Under some pressure, low concentration pulp is fed into closed pulp groove by screw conveyor. Two pressure rolls are built in the groove, and a series of cracks are arranged on the surface of the rolls, which can go through the axial holes through the rolls and get discharged from the ends of the rolls to prevent the clogging of the groove, a group of thinning blades are inserted into the groove, and the axial hole entered into the water or dilute black liquor under some pressure from the axial hole to clean the groove and drain hole. The pulp is thickened to some high concentration and then stripped into the pulp chest by the scrapers.


Twin roll press is set with dehydration, displacement and press parts, so its washing effect is better. It is equipped with advanced hydraulic drive system, bringing us stable and reliable operation. It adopts press principle, has no vacuum requirement and can be installed at different heights, saving the investment of factory building.

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.