Wollastonite Application In Paper Industry

2021-08-09

Summary:The application of wollastonite in the paper industry is quite different from other fillers. It is not a simple filling like traditional fillers. It mainly reli

The application of wollastonite in the paper industry is quite different from other fillers. It is not a simple filling like traditional fillers. It mainly relies on a high aspect ratio to achieve the interweaving of wollastonite and plant fibers to form plants. The fiber-mineral fiber network structure replaces the short fibers of some plants, which can effectively improve the opacity and printing adaptability of the paper produced, improve uniformity, and reduce manufacturing costs.

1.As a paper filler

Wollastonite can be used as a paper filler in pulp, such as the use of papermaking equipment and machinery for 100% deinked pulp. The pulp in this process has been added with appropriate amounts of starch, fixing agent, and aluminum sulfate. The relevant personnel add it in the laboratory. Fill a certain amount of wollastonite, and add an appropriate amount of cationic polyacrylamide, and perform sheeting after stirring. Adding wollastonite at this time will help reduce the COD concentration in the white water, and realize the advantages of fiber saving and cost reduction, can fully improve the economic efficiency, but the surface strength of the paper will be slightly reduced.

For another example, 1250 mesh wollastonite can be added to the paste, and AKD neutral sizing agent and PAM retention and drainage aid can be added in the corresponding order, and then the sheet can be copied. When the amount of wollastonite added is 5%-8%, it will have little effect on the tensile index, tearing index and folding resistance of the finished paper, but it can improve the opacity and hiding power.

In addition, by adding wollastonite to waste corrugated paper pulp for sheet making, the more wollastonite is used as a paper filler, the tightness of the finished paper will first rise and then decrease, and the air permeability of the finished paper The degree drops and then rises. When the amount of wollastonite filler is 10%, the paper's ring pressure index, elongation and other indicators have a certain increase.

2.Partially replace plant fiber

The application of wollastonite in the paper industry can replace part of the wood pulp, which is an important application direction in the paper production process. When the added amount of wollastonite continues to increase, the physical strength of the finished paper will also show a downward trend. If the added amount is 35%, the strength of the finished paper can meet the needs of general use. For example, wollastonite and plant fiber can be used to make composite paper. When the added amount of wollastonite is controlled at 30%-40%, the folding resistance and tear index of the finished paper can be compared with those with 20% calcium carbonate filler. The paper is consistent. To a large extent, it can save the amount of plant fiber added, indirectly reduce the felling and utilization of forest resources, and have the effect of reducing production costs and maintaining ecological balance.

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