Paper Machine Press Section

A high initial wet strength of the moist paper web after leaving the press also leads to a lower number of breaks especially in the first dryer groups.

Paper machine press section.

The task of the paper machine press section is to remove water primarily through wet pressing. The paper web consistency leaving the press section can be above 40. A press section design equation based on the decreasing. The dewatering capacity of a press section and the properties of paper depend on the design and the number of nips.

The press section also has a major impact on sheet surface properties such as. The most important functions of pressing are to increase sheet solid consistency in order to ensure adequate drying capacity to consolidate. The risk of web breaks is determined by the general design of press section and the arrangement of open draws if any. Paper machine press section represent a key area for rebuilds to improve quality of the paper and energy savings.

Ashok industries amraiwadi ahmedabad near swastik char rasta nagarvel hanuman road amraiwadi ahmedabad 380026 dist. Of the machine wahlstrom 1969. In the press section large granite or hard rubber covered rolls are placed in close contact to form a nip. Water removal in the press section of paper board and pulp machines has an important influence on machine efficiency and cost.

The second section of the paper machine is the press section which removes much of the remaining water via a system of nips formed by rolls pressing against each other aided by press felts that support the sheet and absorb the pressed water. A modern press section should fulfill the following requirements. As the paper passes through the nips the water is pressed out of the sheet into press felts that transport and cushion the sheet on its journey through. The suction press uses mechanical action to extract the water from the paper sheet.

Wet pressing increases sheet dryness in order to ensure adequate paper machine drying capacity and to improve web runnability at the beginning of the dryer section. Paper machine clothing second edition 103 3 pressing the press section is the next part of the paper machine after the forming section. Solutions have been developed on various grades to reduce free draws paper breaks and of course increase. The higher the dry content of the paper web after leaving the press section the less energy has to be expended in subsequent drying.