Foam generation is a common problem in the paper preparation process. Excessive foam can affect the quality, productivity, and appearance of the paper, so it is important to take steps to control and eliminate foam. To solve this problem, the paper preparation industry has adopted:Degussa 2291 defoamer
Among the several main steps in paper and cardboard preparation, the main one that is prone to foam formation is the water discharge during pulp preparation and papermaking.
1.Pulp preparation: In the preparation of fiber juice pulp, the fiber raw material is mixed with water by heating and stirring, and the fiber is dispersed into fine fiber filaments. In this process, if the fibers are not evenly dispersed or stirred too strongly, a large number of bubbles will be introduced, forming foam.
2.Water discharge during the papermaking process: In the preparation of paper or cardboard, the fibers need to be formed by squeezing and filtering the water and reducing the moisture on the surface of the paper. In this process, the interaction between water and fibers causes bubbles to form, forming foam.
There are many types of defoamers in paper preparation, common ones include organic and inorganic defoamers. Organic defoamers are usually based on organic compounds, such as silicone oils, fatty alcohols, polyethers, etc. Inorganic defoamers contain some inorganic substances, such as silicon oxide, silica gel, etc. The choice of defoamer should be based on the specific production process and paper requirements.
Degussa 2291 defoamerThere are several key aspects to the use in the paper preparation process:
1.During the preparation of the fiber slurry, a defoamer can be added to the agitator to eliminate the foam generated during the mixing process.
2.In the papermaking process, defoamers can be added to the fiber pulp by spraying or spraying to reduce foam during fiber dispersion.
3.It is also often used to control foam in the surface coating or gluing process during the surface treatment of paper.