Method for making low basis weight manila board from wood fiber
A low-quantity, white-on-gray technology, applied in pulp beating/refining methods, natural cellulose pulp/paper, papermaking, etc., can solve the problems of fiber performance degradation and increased production costs, and achieve low production costs and cost savings , Improve the effect of bulk
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[0063] Example 1
[0064] A method for manufacturing low-weight gray-bottomed whiteboard paper using wood fiber includes the following steps:
[0065] A. Dissolve: Disperse and dissolve wood fibers to obtain wood fiber slurry;
[0066] B. Beating: beating the wood fiber slurry after dissolution treatment;
[0067] C. Coarse screening: Coarse screening the wood fiber slurry after beating treatment;
[0068] D. Purification: The wood fiber slurry treated by coarse screen is mixed with MW slurry, and then subjected to fine sieving, slag removal, concentration and thermal dispersion treatment to prepare the core layer slurry for manufacturing coated white paper;
[0069] E. Papermaking: process the surface layer slurry, lining layer slurry, bottom layer slurry and the core layer slurry prepared in step D to produce low-weight gray-bottom white paper.
[0070] In the step A, the mass percentage concentration of the wood fiber in the wood fiber slurry is 2%; the length of the wood fiber in the ...
Example Embodiment
[0084] Example 2
[0085] The difference between the present invention and the above-mentioned embodiment 1 is:
[0086] In the step A, the mass percentage concentration of the wood fiber in the wood fiber slurry is 3%; the length of the wood fiber in the wood fiber slurry is 0.3 cm and the width is 0.08 mm.
[0087] In the step B, the pulp freeness is 600 CSF; in the step C, the sieve diameter used for the coarse screen is 2 mm.
[0088] In the step D, the weight ratio of the wood fiber pulp to the MW pulp is 4:96, and the MW pulp is a mixed waste paper pulp with a brightness of 38% ISO.
[0089] In the step D, the sieve aperture used for the fine sieve is 0.1 mm, and the fine sieve pressure is 200 KPa.
[0090] The front pre-coating paint includes the following raw materials by weight: 54 parts of calcium carbonate, 24 parts of kaolin, 10.4 parts of latex, 0.18 parts of water repellent, 0.02 parts of antifoaming agent, 0.05 parts of dispersant, 0.03 parts of bactericide, rheological 0...
Example Embodiment
[0097] Example 3
[0098] The difference between the present invention and the above-mentioned embodiment 1 is:
[0099] In the step A, the mass percentage concentration of the wood fiber in the wood fiber slurry is 3%; the wood fiber in the wood fiber slurry has a length of 0.4 cm and a width of 0.1 mm.
[0100] In the step B, the pulp freeness is 625 CSF; in the step C, the sieve diameter used for the coarse screen is 3 mm.
[0101] In the step D, the weight ratio of the wood fiber pulp to the MW pulp is 4:96, and the MW pulp is a mixed waste paper pulp with a brightness of 40% ISO.
[0102] In the step D, the sieve aperture used for the fine sieve is 0.15 mm, and the fine sieve pressure is 220 KPa.
[0103] The front pre-coating paint includes the following raw materials by weight: 58 parts of calcium carbonate, 28 parts of kaolin, 10.8 parts of latex, 0.25 parts of water repellent, 0.02 parts of antifoaming agent, 0.06 parts of dispersant, 0.03 parts of bactericide, rheology 0.55 pa...
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