A low weight white cardboard and its production process
A white cardboard, low basis weight technology, applied in the field of papermaking, can solve the problems of low bonding force, high production cost, and high cost of the paper layer, and achieve the effect of increasing bonding strength, increasing usage, and reducing pulp cost
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Embodiment 1
[0037] The surface layer pulp adopts bleached chemical pulp (including 75% bleached hardwood kraft pulp and 25% bleached softwood kraft pulp) by weight, disintegrates, grinds and beats, enters the headbox of the paper machine, and filters the surface screen .
[0038] The components and weight percentages of the core layer pulp: 63% of BCTMP pulp, 12% of bleached hardwood kraft pulp, and 25% of broken paper;
[0039] Among them, 60 grams of fiber-modified enzymes are added to BCTMP pulp per ton of BCTMP pulp F with 40g fiber modifying enzyme The amount of Z added to the fiber modifying enzyme F and fiber modifying enzymes Z is disintegrated and mixed, and then, disc grinding and beating are carried out at intervals of 1h;
[0040] Bleached hardwood kraft pulp is crushed, mixed, disc-grinded and beaten;
[0041] Broken paper shredding and mixing, disc grinding and beating;
[0042] Then, the above-mentioned BCTMP pulp, bleached hardwood kraft pulp, and broke pulp are ...
Embodiment 2
[0050] The difference between this embodiment and the above-mentioned first implementation is that the fiber modifying enzyme F and fiber modifying enzymes The addition amount of Z in BCTMP pulp is different; And, in order to further reduce the raw material cost of core layer pulp, after described BCTMP pulp, bleached chemical pulp, broken paper mixing, also comprise a step, in core layer pulp ( BCTMP pulp, bleached chemical pulp, broken paper mixed slurry) is added with filler, the filler is calcium carbonate, and the amount added is 0-45 kg per ton of core layer pulp. Other implementation steps are consistent with the above-mentioned first embodiment, and will not be repeated here. This embodiment adds 110 grams of fiber-modified enzymes with every ton of BCTMP pulp F with 60g fiber modifying enzyme Z, add 25 kg of calcium carbonate per ton of core layer slurry as an example to illustrate.
[0051] The component distribution ratio and performance index of the ordinar...
Embodiment 3
[0057] The difference between this embodiment and the above-mentioned second implementation is that the fiber modifying enzyme F. Fiber modifying enzyme Z and calcium carbonate fillers are added in different amounts. Other implementation steps are consistent with the above-mentioned second embodiment, and will not be repeated here. This embodiment adds 150 grams of fiber-modified enzymes with every ton of BCTMP pulp F with 90g fiber modifying enzyme Z, add 45 kg of calcium carbonate per ton of core layer slurry as an example to illustrate.
[0058] The component distribution ratio and performance index of the ordinary white cardboard with a quantitative basis of 260 g / m2 on the market and the white cardboard with a quantitative basis of 260 g / m2 described in this embodiment are as follows:
[0059]
[0060]
[0061] For ordinary white cardboard with a quantitative basis of 260 grams per square meter on the market, in order to ensure the bonding strength between t...
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