What's Factors Affect The Dewatering Efficiency of Paper Machine Press Section

1.Selection of Press Felt

According to your paper machine features and needs to choose suitable press felt for your paper machine. Sun Hong press felt have good initial applicability, good thickness retention, large save water space and continuous and stable dehydration ability.

2.Cleaning of Press Felt

It’s very important to keep press felt always be clean. The normal clean method is mechanical cleaning and chemical cleaning. The mechanical cleaning method need provide with the high pressure moveable spray pipe, low pressure fan spray pipe and vacuum suction box. The chemical cleaning method need choose suitable felt cleaning agent, agent consistency, temperature, and cleaning position are very important.

3.The Installation of Vacuum System

The configuration of the vacuum system should be reasonable, and the vacuum systems of the forming section and press section must be separated. The vacuum systems of the vacuum suction roller, suction press roller, and vacuum suction box should be separated to avoid mutual influence.

In order to save energy, some paper mills have replaced the raw water ring pump with a turbine fan. The selection, configuration, and use of the turbine fan are crucial. It is necessary to comprehensively evaluate the vacuum system and the washing system of the felt, and make corresponding adjustments to the design of the felt after selecting the turbine fan.

4.Cleaning of Suction Roll and Vacuum Suction Box

The transparency of the holes in the suction transfer roll and suction press roll is extremely important. It is necessary to strengthen cleaning and keep them unobstructed, otherwise edge shedding and water splashing may occur from time to time; The cleaning of the roller surface of grooved rollers, blind hole rollers, or grooved blind hole rollers is also important. The cleaning of the roller surface, the position of the doctor blade, the material of the doctor blader, and the installation position of the water receiving tray all affect the dewatering effect.

The blockage or poor cleaning of the vacuum suction box body reflects that the entire dewatering of the felt is inconsistent. The air speed meter and portable vacuum transformer provided by the technical service of SUN HONG can determine the location of such problems.

5.Maintenance of Dewatering Equipment

Regularly replace each press roller to ensure that the crown and line pressure remain consistent; There are rubber coated press rollers and polyurethane press rollers for large diameter press rollers. Generally speaking, the wear resistance of rubber coated press roll is not as good as that of polyurethane press rollers, and they need to be checked and updated in a timely manner.

Keep the high and low pressure spray pipes unobstructed at all times, rinse the felt without dead zones, and ensure that the entire felt is washed evenly and consistently. The edges of the felt are most prone to problems, so it is necessary to strengthen the washing of the edges of the felt; Ensure that there is sufficient lubricating spray water at the edges to reduce wear.

Modern paper making no longer considers the service life of felt as the sole criterion for measuring their quality, but instead regularly replaces felt and evaluates their overall performance.

SUN HONG's mission is to provide valuable technical services to customers, continuously improving the efficiency of paper machine operation, optimizing equipment configuration, enhancing equipment protection, and reducing total operating costs, providing comprehensive solutions covering all aspects. This includes mechanical, operational, chemical, and other aspects.

Machinery: structure of press section, configuration of vacuum system, design and installation of high and low pressure spray pipes, etc;

Operation: use and maintenance of felts, adjustment of press parameters, operation of spray systems, cleaning of flow systems, etc;

Chemistry: Selection of retention/filtration aids, selection and design of cleaning chemicals, requirements for washing water quality, etc.