How to Clean Paper Making Felt ?

Change of Paper Making Felt

1) Keep the felt clean to prevent oil stains from sticking to it.

2) There should be sufficient clearance between the roll shaft and the shaft sleeve or between the rolls to make it easy to cover the felt and avoid pulling the felt in through the gap with force.

3) Before the paper making felt is flattened on each roll, it cannot be dropped onto the top press roll, bottom press roll, or lifted onto the support roll. Before the paper machine runs normally, it is absolutely not allowed to apply pressure on the press roll.

4) The removed bearings, oil rings, screws, and other components should be placed in a certain position, and the felts should be installed promptly after replacement. Before starting up, check whether there are any strange objects on the top and bottom of the felt, as well as the pressing and auxiliary devices.

5) When the paper making felt runs slowly until it runs well, water can be used to wet the felt evenly until it is saturated with water, and then adjust the tensioning roll to tension the felt to the optimal length, width and dehydration state.

6) When the downtime is long, the paper making felt should be relaxed to prevent excessive tension concentration.

When replacing paper making felt, attention should also be paid to:

1) BOM felt have good stiffness and do not require the use of felt roll ; If there is no spare roll to replace the felt roll, the felt roll must also be installed at the position with the smallest felt wrap angle.

2) BOM felt have strong specificity, and even felts of the same specifications can have significant differences in performance. Therefore, care should be taken not to use the wrong felt.

3) There is a significant difference between the front and back of BOM felt, and there is a standard line surface with paper (front), so do not invert it.

4) The running direction of the felt on the paper machine should follow the direction indicated by the arrow on the felt surface.

Cleaning of Paper Making Felt

The effective method to extend the service life of wet felt, all other conditions being equal, is to install a suitable wet felt cleaning system.

There are generally two reasons for the wet felt changed:

1) Blockage

2) Compaction

The paper making felt cleaning system has three functions:

1) Prevent blockage

2) Prevent compaction

3) Remove a certain amount of moisture from the wet felt to improve the dehydration of the paper web in the compression zone.

There are two methods for cleaning paper making felts: mechanical and chemical

Mechanical cleaning:

The ideal cleaning system consists of five independent parts:

1) Low pressure flushing spray pipe

2) Detergent spray pipe

3) Lubrication spray pipe

4) High pressure sprinkler pipe

5) Wet felt vacuum suction box

Chemical cleaning:

The most commonly used chemical cleaning method currently is shutdown cleaning. For the bottom net needle punched felt composed of 100% cotton fiber, 5-10% alkaline detergent (such as caustic soda) can be used, with a washing temperature not exceeding 50℃ and a residence time of 20 minutes. After each rinse, thoroughly rinse the wet felt. In addition, special attention should be paid to avoiding contact with paper making felt with this detergent.