Pulp and paper defoamer-Indispensable chemicals for the paper industry
We all know that the main component of the pulp composition of the fiber is cellulose, according to the pulping method, processing process of different pulp can be divided into mechanical wood pulp, chemical wood pulp (also can be divided into sulfate wood pulp, sulfite wood pulp, etc.), etc.. But no matter which kind of wood pulp, in because of the erosion of the chemical solution, or by the mechanical force of the damage, are prone to a large number of bubbles or even pile up, affecting the normal operation of the process and the quality of paper.
So, the often mentioned pulp and paper defoamer is able to complete the task of removing foam and avoiding the harm caused by foaming? Next I will explain the role of pulp and paper defoamer can play from the traditional two pulping processes, come together to see.
1. Pulp and paper defoamer in mechanical pulp process
This is a more traditional pulping method, using mechanical grinding force to obtain fibers. As the mechanical pulp in the grinding into pulp, will still contain incomplete dissociation of fiber bundles, a small amount of wood fragments and sand and dust and other impurities, need to be screened, precipitation and hydrocyclone to purify, without adding pulp and paper defoamer pulp is susceptible to mechanical external forces, in the continuous involvement of air bubbles slow down the process. The reasonable addition of high temperature resistance, strong acid and alkali, good dispersion of pulp and paper defoamer can help the rapid elimination and suppression of foam and avoid the waste of resources caused by foam overflow.
2. Pulp and paper defoamer in chemical slurry process
This method is also prone to foam buildup due to the different types of raw materials, the increase in temperature during cooking and the number of chemical reagents added to processes such as bleaching. The pulp and paper defoamer, made by polymerization of alcohols, polyethers, fatty acid amides and other small amounts of substances, can quickly remove the fine bubbles trapped between fibers and eliminate the foam floating on the surface of the chemical pulp, thus making the pulp have a better uniformity and the quality of the pulp can be greatly improved.
What else do you want to know about defoamer for paper industry?
