The vital role of defoamers in the paper industry
Paper defoamer is a chemical additive designed for the characteristics of paper making process foaming in paper making industry. The use of defoamer can effectively control the pulp, foam overflow, and improve the quality of paper making. Paper defoamer is widely used in paper making system defoaming, also can be used in paper sewage treatment, antifreeze, distillation system defoaming.
Sources of foam in the papermaking process
Foam in paper white water mainly comes from the pulping process to the pulp pool in the addition of many chemical additives, such as filter aids, retention aids, wet strength agent, sizing agent, etc., they are in the process of pulping and white water closed cycle is very easy to produce air bubbles.
As the pulp contains very fine fibers and pigment fillers, etc., these solid substances for the adsorption of bubbles provides a carrier, according to the different fibers, some adsorption on the surface of the fiber, some penetrate into the interior of the fiber, at the same time, fine pigments and fillers are easy to attach in the surface of the bubbles, enhance the strength of the bubble. Of course not lined up some fine bubbles dispersed in the slurry. When the bubble content in the slurry is a lot of bubbles, bubbles are easy to merge, small merged into a large, large bubbles due to the density is very small and easy to float on the liquid surface, that is, we usually see the liquid surface foam, compared to the slurry fiber adsorbed on the fine bubbles, the foam on the liquid surface is larger.
Liquid surface foam may also be generated by the slurry wash is not clean, fiber wetting and expansion is not complete, the slurry was a waterfall fall, slurry pump air leakage, etc., a large number of air mixed into the water produced by the foam and other factors.
Paper defoamer performance characteristics
Paper defoaming agent can quickly eliminate the foam produced by straw, rice straw, pine, waste paper, reed, bamboo and other surfactants in the papermaking industry. It has obvious effect in pulping and washing, long-lasting foam suppression, non-toxic and odorless, no post-pollution. Paper defoamer antifoam can effectively control pulp overflow and improve the quality of paper making.
The use of paper defoamer
In the pulp mill defoamer is generally added in the bleaching and washing section, generally in the washing machine, thickener and pulp pool. Antifoams in the papermaking section are generally added to the paper machine headboxes, pulp tanks, coating and sizing presses.
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