In the paper industry, as a papermaking chemical, its effect is far superior to that of PAM with single characteristics, especially in retention and drainage, where it can increase the drainage speed under the wire and reduce the loss of fibers and fillers. It also has a promoting and compensating effect on the smoothness and strength of the finished paper.
Polyacrylamide is used in the production processes of white cardboard, coated paper, cardstock, and typing paper, which use wood pulp, straw pulp, and waste paper pulp as raw materials. It is mainly used as a paper strengthening agent, a retention aid for fine fibers and fillers, and a drainage aid in the papermaking process. It also acts as a dispersant and flocculant, and is used in dissolved air flotation machines and sludge dewatering for wastewater treatment generated during papermaking. Retention and Drainage Aids: Polyacrylamide can increase the retention of fibers and other wet-end additives on the wire, accelerate water drainage on the wire and dewatering in the press section, significantly increase ash retention, and improve the first-pass fiber retention rate by an average of more than 10%. It also improves starch retention, thus creating favorable conditions for using starch as an inter-layer strengthening agent. This increases paper sales profits while also saving on filler costs. The drainage performance is significantly improved, which allows for a corresponding increase in machine speed. 8-10% (average value). Generally, high molecular weight polymers have better retention properties, while low molecular weight polymers have better drainage properties.
polyacrylamideIMG_5615 Strengthening Agent: Effectively improves paper strength and enhances the surface properties and printing performance of paper. Dispersing Agent: Improves the uniformity of the paper sheet. Flocculant: Can be used as a flocculant in pulp wastewater treatment to remove organic components from wastewater. When used in combination with inorganic flocculants, it can bridge and precipitate suspended solids, achieving a removal rate of 70-80%. It reduces the problem of excessive COD levels in wastewater. Solves the stickiness problem caused by recycled paper raw materials. Because recycled paper is used as a raw material, especially the adhesives, additives, and impurities in waste cardboard boxes often adhere to the wire section, felt, rollers, and drying cylinders of the paper machine, causing serious production problems. Paper-making-specific polyacrylamide can effectively help solve the stickiness problem through adsorption, dispersion, and flocculation principles. Applications and usage concentrations in the paper industry: Used for pulp retention and drainage, wastewater recycling, dissolved air flotation, and sludge dewatering. Products used:
Anionic and
cationic polymers (1‰–2‰).
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