Detailed understanding of the application of defoamer in the paper industry
PULPING DEFOAMER
In the process of papermaking pulp due to the pulp contains fatty acids, resin acids and other natural substances, after cooking liquid, chemical washing will generate fatty acid soap, fatty acid soap and other foaming substances, a large number of bubbles will be followed by cleaning and transportation and bleaching to bring some trouble resulting in a decline in pulp quality, so the need to use pulping defoamer to deal with. Pulping defoamer used in the pulp process mainly polyether defoamer and silicone emulsion defoamer two categories. This kind of antifoam agent can quickly lignin and some surfactants generated by the foam treatment, the use of the effect in the pulping and washing of the pulp is particularly obvious.
PAPERMAKING DEFOAMER
For the paper making process, if the foam generated by the paper making process is not solved, it will lead to paper break, white water level fluctuation, pump frequency fluctuation, etc., which directly affects the stability and quality of paper production. The papermaking defoamer can effectively inhibit white water foaming, while the fine bubbles trapped between the fibers, the foam on the surface of the pulp can be dealt with. Papermaking defoamer is also able to dissolve the air within the pulp, dealing with the surface of the large bubbles, so you can avoid the formation of holes, reduce the paper breaks and overflow of the pulp storage tank, thus ensuring the loss of pulp fibers and chemicals, so that the uniformity and quality of the paper have been improved.
Characteristics that defoamers in the paper industry should possess
Paper industry defoamer is mainly used to control the foam generated in the production of alkaline pulp, paper washing, bamboo pulp, cane pulp, neutral pulp, pulp, pulp rinsing, screening, bleaching, water treatment, plant fiber pulp. Defoamer following several properties:
1、Stronger defoaming and foam-breaking properties
2、Fast and thorough improvement of filter drainage
3、Good mutual solubility in black liquor, applicable to the production conditions of pulp mills
4、Improve rinsing efficiency
5、Improve pulp quality by reducing salt loss.
6、Reduce the content of bleaching chemicals, to meet the requirements of environmental protection
