Paper Machine Press Section Dewatering

Paper machines usually have at least five distinct operational sections.

Paper machine press section dewatering. It has a major impact on the structure and runnability of the paper and thus the operating efficiency of the machine wahlstrom 1969. A press section design equation based on the decreasing. Press section where the wet fibre web passes between large rolls loaded under high pressure to squeeze out as much water as possible. Most drainage on a paper machine occurs mechanically on the wire and press sections.

In the wire section press section and. For example higher freeness furnish and or decreased refining yields higher solids out of the press. Rundry is a complete solution with the payback time typically under 1 year. The resulting high dryness gives high wet web strength.

A summary of the various stages of dewatering on the paper machine wire and the potential mechanisms of dewatering during each of the stage are given. It determines the dryness of the sheet entering the dryer section. Water removal in the press section of paper board and pulp machines has an important influence on machine efficiency and cost. Valmet s symbelt shoe press significantly improves quality and adds dewatering capacity in the press section with fewer press nips.

Dewatering efficiency of the paper web in the wet part of the paper machine. Ecoflow optimizes dewatering and vacuum levels in the paper machine forming and press sections. The task of the paper machine press section is to remove water primarily through wet pressing. When the dry solids content of a web after the paper machine press section is approximately 50 1 g dry solids g h 2.

104 paper machine clothing second edition by press speed m sec with the unit of kn m x sec kpa sec. Ecoflow dewatering measurement system is a very essential part of the runeco solution together with ep turbo blowers. Forming section commonly called the wet end is a continuous rotating wire mesh which removes water from the paper by sucking it out of suspension via vacuum. The dewatering capacity of a press section and the properties of paper depend on the design.

Runtech s tailor made solution rundry significantly improves dewatering doctoring and cleaning processes enabling increased dryness after the press section. If the vacuum pump is worn and airflow is down to 60 of original energy and pump seal water is wasted and the white water must be removed thermally from the paper with steam in the dryer section to thermally vaporize the moisture at a much higher use. Machine and has great influence on paper quality.