A large amount of foam is prone to appear in the papermaking process, which is mainly related to the composition and process of papermaking slurry. Foam will affect the formation of paper. The quality of papermaking paper is not good. If you encounter papermaking foam problems, you can eliminate the foam by adding a papermaking slurry defoamer. The Nanhui defoamer manufacturer analyzed the cause of the foaming of the paper pulp and gave a defoaming plan.
(Picture: Why use papermaking slurry defoamer)
Causes of foaming of paper pulp
The increase in the content of these substances in the slurry will easily produce foam. Generally, there are several reasons:
1. The pulp in the pulping part is not cleanly washed, or the bleached pulp is not cleanly washed. At this time, a large amount of surface active substances remain in the pulp, which causes the paper machine feeding system to produce foam.
2. The amount of sizing is large, so that the slurry contains more rosin salts, or the pH value of the slurry is higher, so that the sizing material does not settle on the fiber well, and it exists in the slurry in the form of rosin acid soap. At times, it will lead to an increase in bubbles.
(Picture: Causes of blistering in paper production)
The harm of papermaking foam
1. Foam has a greater impact on papermaking engineering. The presence of foam in the paper material will cause the concentration of the headbox to fluctuate and make the flow state of the paper material unstable. It can close the micropores on the surface of the wet paper web, which makes the mesh difficult to dehydrate, and causes the fibers and undispersed fillers to agglomerate in the mesh and affect the uniformity of the paper web.
2. The foam will also form floating pulp, which will cause the paper material to break when the lumps appear on the Internet. When paperboard is made, the foam exists between the layers of the paperboard, reducing the bonding strength between the layers, and the foam will also cause the paper or paperboard to produce foam holes and foam spots. Resin spots and other paper diseases.
3. During the processing of coated paper, if there is a large amount of foam at the storage tank and the coating roller, the foam will overflow, which will not only affect the normal operation of coating and cause the flow of paint but also pollute the environment. When the coated paper with foam dries, the foam ruptures due to the thermal expansion of the air in it, forming depressions on the paper surface, thereby destroying the smoothness and smoothness of the paper surface and affecting the exquisiteness and integrity of the printed paper. When the foam is serious, it will increase the viscosity of the coating, and make the flow performance of the coating worse, which will cause difficulties in production.
(Picture: Hazards of paper production foam)
For the defoaming program
Paper production foam is difficult to avoid, and it is easy to cause negative effects. Therefore, paper production foam needs to be controlled and processed as soon as possible. Adding a defoamer is a very common method. The defoamer is a chemical defoaming solution that will not change the original production process or affect the papermaking production process. It is very convenient to use.
The Nanhui defoamer manufacturer has developed a defoamer for paper pulp that is prone to foam in the papermaking process and is a defoamer with fast defoaming speed and good foam suppression.
Has the following product advantages:
1. It has strong defoaming ability, and it can quickly eliminate large and small bubbles when added to the slurry;
2. Stable quality, resistant to high temperature, strong acid, strong alkali and other environments, and can continue to defoam and suppress foam under various harsh conditions;
3. The concentration is high and the addition amount is small, generally about one-thousandth to three-thousandths of the foaming system.
Nanhui metalworking fluid defoamer is added in the production, which can control the foam from the production source, optimize the formula of the metalworking fluid, reduce the surface tension of the system, and reduce the foaming power. The defoaming agent can also be added during the use of metalworking fluids, generally about three thousandths of the foaming system. The addition amount is small, which can quickly defoam the foam and inhibit foam regeneration for a long time.
The source manufacturer of Nanhui defoamer can solve various industrial foam problems in a targeted manner. If you encounter bubble problems in related industries, you can call Nanhui technical specialist Yoyo +86 134 28601010
