Common Issues During the Installation of New Press Felt

In the process of papermaking, we often encounter various problems, resulting in a large number of paper diseases.

Timely and accurate analysis of the causes of problems is necessary to take effective measures quickly and minimize losses. This is the job that we paper workers should do. Below are several common paper problems related to press felt for discussion:

Paper Sheet Breaks Caused By Press Felt

Paper sheet breaks refers to the formation of fluid pressure on wet paper sheets in the compression zone. Under the action of fluid pressure, the moisture in the paper sheet is discharged outward. If the drainage is not smooth, it will damage the arrangement of fibers in the wet paper sheet. This phenomenon is called “crushing” and is the most common and headache inducing paper disease.

There are four factors that can cause paper sheet breaks in paper making felt. The following will only elaborate on the factors of press felt:

Wrong Press Felt Choice Lead to Paper Sheet Breaks

The selection of press felt must be based on various technical parameters and production environment of the paper machine to choose the product name, weight, breathability, thickness, and raw material origin of the matching paper felt. It is best to communicate and cooperate with the technical personnel of the paper making felt manufacturer to avoid detours.

Paper Sheets Breaks Due to Dirty Press Felt

Strengthening the washing of press felt and maintaining their cleanliness is of utmost importance in extending their service life and reducing the occurrence of paper diseases.

Paper Sheets Breaks Due to Wear and Tear of Press Felt

The wear of press felt can be divided into two types: uniform wear and localized wear.

The reasons for the wear of the press felt include: replacement of the vacuum box panel, insufficient needle tightness of the paper making felt, light shaping, excessive vacuum, lack of lubricating water between the felt and the vacuum panel, improper selection of vacuum panel material, high friction coefficient, and later use of the press felt. Measures should be taken to address the different reasons mentioned above.

Paper Sheet Breaks Caused by Poor Operation of Press Felt

The operating status of press felt mainly includes: the tension state of the felts; The horizontal contraction state of the felt; The standard line of the felt is in a straight state; The surface of the felt is flat, etc. Insufficient tension of the felt, excessive lateral shrinkage, air leakage from the vacuum suction box, deformation and bending of the felt standard line, and uneven tension of the felt bottom fabric can all easily lead to uneven dehydration of wet paper sheets and result in crushing. To solve this problem, we should also identify the cause and take targeted measures.