Back cover tape base paper, manufacturing method of back cover tape base paper, and back cover tape
A technology of back cover and base paper, which is applied in the direction of paper, papermaking, packaging paper, etc., can solve the problems of easy to break, easy to wrinkle, dusty, etc., and achieve the effect of reducing transverse shrinkage, small transverse shrinkage and uniform fiber structure
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Embodiment １
[0040] A base paper for a back cover tape, comprising a bottom layer and a surface layer coated on the bottom layer, wherein the thickness of the bottom layer is 27 μm, the main raw material is softwood pulp, and auxiliary materials are added, including auxiliary material 1, auxiliary material 2 and auxiliary material 3. The first auxiliary material is polymer resin. The surface layer is a polymer resin layer, comprising 90wt% of modified polyvinyl alcohol and 10wt% of an organosilicon type water-repellent and moisture-proof agent.
[0041] The macromolecular resin of the first auxiliary material is polyethylene oxide, and the addition amount is 0.01% of the weight of softwood fibers. The second auxiliary material is a thermosetting resin. In this example, a polyvinyl alcohol resin with a low degree of polymerization is used, and the addition amount is 0.8% of the softwood fiber. The third auxiliary material is anionic disperse rosin gum, and the addition amount is 0.8% of th...
Embodiment 2
[0050] A base paper for a back cover tape, comprising a bottom layer and a surface layer coated on the bottom layer, and the raw material composition of the surface layer and the bottom layer is as follows:
[0051] Surface layer: 95wt% modified polyvinyl alcohol and 5wt% organosilicon water and moisture repellent;
[0052] Bottom layer: softwood pulp; auxiliary material 1: low molecular weight polyacrylamide resin; auxiliary material 2: mixture of polyvinyl alcohol resin and polyethylene imine resin with low polymerization degree; auxiliary material 3: cationic rosin gum.
[0053] The preparation method of above-mentioned base paper for back cover tape is as follows:
[0054] 1. Pulping the bleached softwood pulp, adding 1.0% NaOH and 0.3% Na2HPO4, pulping to a concentration of 12%; then diluting with water to a concentration of 4.5% for beating treatment until the beating degree is 48°SR, wet weight 6.5g;
[0055] 2. Add aluminum sulfate solution to adjust the PH value of th...
Embodiment 3
[0061] A base paper for a back cover tape, comprising a bottom layer and a surface layer coated on the bottom layer, and the raw material composition of the surface layer and the bottom layer is as follows:
[0062] Surface layer: 92wt% modified polyvinyl alcohol and 8wt% organosilicon water and moisture repellent;
[0063] Bottom layer: softwood pulp; auxiliary material 1: polyethylene oxide resin; auxiliary material 2: polyamide polyamine epichlorohydrin resin; auxiliary material 3: anion-dispersed rosin gum.
[0064] The preparation method of above-mentioned base paper for back cover tape is as follows:
[0065] 1. Pulping the bleached softwood pulp, adding 1.5% NaOH and 0.5% Na2HPO4, pulping to a concentration of 13%; then diluting with water to a concentration of 4.0% for beating treatment until the beating degree is 45°SR, wet weight 8.0g;
[0066] 2. Add aluminum sulfate solution to adjust the PH value of the slurry to 5.5, add auxiliary materials and mix them evenly:...
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