Correct replacement and use of forming fabrics

Forming fabric is a valuable material in the paper industry. It forms and dehydrates the paper and then transports the paper to subsequent locations. In the machine to play a filtering pulp in the water and put a lot of networks in the wet paper layer closely iterated, so requires wet. The wet-forming fabric is therefore required to have good water filtration and durability. Here's a look at the correct replacement and use of forming fabrics.

Here is the content list:

• Replacement of the forming fabric

• When replacing the forming fabric should also pay attention to

• Problems and solutions in the use of press felt.

Replacement of the forming fabric

(1) Keep the forming fabric clean and prevent oil and dirt from sticking to the press felt.

(2) There should be sufficient clearance between the rollers and the sleeve or between the rollers and the rollers so that the press felt can be easily set on. Avoid pulling the fabric in from between the gaps.

(3) Before the forming fabric is spread out on each roll, it cannot be dropped on the pressure rolls, volt rolls or raised rolls, etc. Never put pressure on the press rolls before the paper machine has run its test run properly.

(4) The unloaded bearings, oil rings, screws, and other parts should be placed in a certain position and should be installed in time after the press felt is replaced. Check that there are no foreign objects above and below the forming fabric as well as the pressing and auxiliary devices before starting the machine.

(5) When the press felt runs slowly until it runs well, the press felt can be wetted evenly with water. We can wait until the water is absorbed and then adjust the tensioning roller to tension the forming fabric to the best length, width, and dewatering state.

(6) When the downtime is long, relax the forming fabric to prevent excessive tension concentration.

When replacing the forming fabric should also pay attention to

(1) Forming fabric is good stiffness. It is not necessary to use a splitting roller, e.g. if there is no spare roller to replace the splitting roller, but also to install the splitting roller in the position where the forming fabric has the smallest wrap angle.                          

(2) The specialization of the forming fabric is very high. Even press felts of the same size can vary greatly in performance, so care should be taken not to use the wrong press felt.                                      

(3) The front and back side of the forming fabric is very different, there is a standard line side with a paper side (front side) don't go on the reverse.

(4) The direction of the fabric running on the paper machine should be according to the direction marked by the arrow on the press felt.

Problems and solutions in the use of press felts.

Problem 1: Uneven drainage or streaks on paper

Solution: Uneven drainage or streaks on paper can result from poor fabric performance caused by clogging or damage. Regular cleaning and maintenance of forming fabrics can help prevent clogging and ensure consistent drainage.

Problem 2: Reduced fiber support or fiber loss

Solution: Reduced fiber support or fiber loss can occur when forming fabrics are worn or damaged. To address this issue, regular inspections and maintenance of forming fabrics are crucial. Replacing worn or damaged fabrics with high-quality alternatives can also help maintain optimal fiber support and minimize fiber loss.

Problem 3: Poor machine runnability

Solution: Poor machine runnability can be caused by various factors such as improper tension, incorrect alignment, or insufficient lubrication. Regular checks and adjustments can help ensure optimal machine performance. Additionally, selecting appropriate forming fabrics that match machine specifications and operating conditions can help improve runnability.

In conclusion, the use of forming fabrics can result in various issues that affect production efficiency and final paper product quality. Regular maintenance and inspections, proper fabric selection, and appropriate installation and operation practices can help prevent these problems and ensure optimal performance and product quality.

Sun Hong Group is a manufacturer of forming fabrics and press felts and can customize forming fabrics to different specifications according to customer requirements. We use environmentally friendly and safe materials and strictly enforce quality management system standards.