How to Choose Suitable Paper Making Felt

When choosing press felt, we must pay special attention to the relevant technical parameters of the paper machine. Only by adjusting the relevant process and technical parameters of the blanket appropriately according to the actual usage conditions of the paper machine can the paper blanket meet the actual needs of the paper machine.

Requirements for the Strength of Press Felt under Linear Pressure and Mechanical Load

The line pressure and mechanical load in the paper press area are directly proportional to the strength requirements of the press felt. The greater the line pressure, the higher the compressive strength that the selected paper making felt can withstand during its lifecycle. At the same time, it is required that the paper making felt has good elastic recovery performance, so as to maintain good water filtration performance and water holding space for a long time. The greater the mechanical load, the greater the tensile (fracture) strength required of the paper making felt when transmitting power, while also requiring a smaller elongation and shrinkage rate.

The Effect State of Vacuum on Paper Making Press Felts

The vacuum degree of the paper machine system and the setting status of the vacuum system directly determine the moisture content, cleanliness, and dewatering performance of the paper making felt, especially the bottom web paper making felt. If the vacuum is too small, it will cause problems such as poor dehydration of wet paper sheets, high moisture content in the press felt, inability to apply pressure in the compression zone, difficulty in guiding paper, and inability to clean the press felt thoroughly. Excessive vacuum will lead to increased transmission load on the paper machine, increased wear on the surface of press felt, and energy waste.

Requirements for Washing Paper Making Press Felts

The washing conditions include the configuration of the washing device, the requirements for washing water quality, the setting of washing water pressure and vacuum degree, etc. The quality of washing conditions is directly proportional to the washing effect. When choosing a paper making felt, it is important to pay attention to the washing conditions of the paper machine. Under normal circumstances, we require every paper machine to have good washing conditions to meet the requirements of the wire and felt, but in reality, the situation of each paper machine is different, and the situation of each paper machine is also different at different times. Therefore, when choosing paper making felt, it is necessary to adjust the variety, quantity, structural ratio, production process, and shaping degree of the paper making felts within a certain range to meet the needs of the paper machine.

The Influence of Pulp on the Filtration Performance and Lifespan of Paper Making Press Felts

The quality of the pulp not only affects the quality of the paper to be copied, but also plays a crucial role in the filtration status and service life of the press felt. The beating degree of the pulp, the viscosity of the filler, and the content of impurities are inversely proportional to the water filtration performance of the press felt. In addition, the chemical fiber felt is resistant to weak alkali and acid, and the pH value of the pulp also has a certain impact on the felt. When selecting the matching paper making felt, it is important to pay attention to the ratio of pulp, the degree of beating and wet weight of pulp, the use of chemical products, the acidity and alkalinity of pulp, and other parameters. These will directly affect the water filtration performance and service life of the paper making felt, as well as the surface viscosity state of the paper making felt.

Dehydration Methods for Paper Making Press Felts

The pressing type of the paper machine determines the dehydration method of wet paper sheets. Different pressing types are suitable for different paper press felt. It is necessary to select paper making felt with suitable performance based on parameters such as the line pressure, vacuum degree, fit state of the felt, setting state of the vacuum system, and washing state of the squeezing process. The chapter on the performance of paper making felt has also been introduced. Generally, paper machines that mainly use horizontal dehydration should choose felts with high compressibility and small weight; The paper machine used for vertical dewatering, which combines squeezing and vacuum suction, generally selects felts with low compressibility, good elasticity, and large weight. The selection of the number of layers for the bottom mesh of the press felt should also be determined based on the parameters of the press section of the paper machine mentioned above. In better conditions, blankets with more layers can be selected to extend the service life of the paper press felt, improve the speed of the paper machine, and improve the quality of the paper.