Method for improving pop strength of paper sheet and paper sheet manufactured through method
A technology of bursting strength and paper, applied in the field of paper to improve the bursting strength of paper, can solve the problems of increasing dosage, increased input cost, inability to achieve high bursting strength, increased input cost, and improved bursting strength.
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[0027] Example 1
[0028] In the long fiber refining line and the short fiber refining line, the long fiber pulp accounts for 56% of the total slurry, and the remaining is short fiber pulp; among them, the long fiber pulp added to the short fiber refining line accounts for the total slurry Of 25%. The pulp line is provided with two refiners in series, and the power ratio of the two refiners along the flow direction of the slurry is 45:55. After refining, the freeness of the long fiber pulp in the long fiber refining line reached 461ml, and the freeness of the mixed pulp of long and short fibers in the short fiber refining line reached 403ml. Under the premise that the speed ratio of the slurry to the network is greater than 1, reduce the speed of the slurry supply pump.
[0029] The grammage of the paper prepared in Example 1 was 80 g, the burst strength reached 346 kPa, and the burst strength was much higher than the national standard (over the target burst strength of 320 kPa)....
Example Embodiment
[0031] Example 2
[0032] In the long fiber refining line and the short fiber refining line, the long fiber pulp accounts for 58% of the total slurry, and the remainder is the short fiber pulp; the long fiber pulp added to the short fiber refining line accounts for the total slurry Of 28%. The pulp line is provided with two refiners in series, and the power ratio of the two refiners along the flow direction of the slurry is 45:55. After refining, the freeness of long fiber pulp in the long fiber refining line reached 447ml, and the freeness of the mixed pulp of long and short fibers in the short fiber refining line reached 419ml. Under the premise that the speed ratio of the slurry to the network is greater than 1, reduce the speed of the slurry supply pump.
[0033] The grammage of the paper prepared in Example 2 is 120g, the burst strength reaches 407kPa, and the burst strength is much higher than the national standard (over the target burst strength of 380kPa).
Example Embodiment
[0034] Example 3
[0035] In the long fiber refining line and the short fiber refining line, the long fiber pulp accounts for 59% of the total slurry, and the remainder is the short fiber pulp; the long fiber pulp added to the short fiber refining line accounts for the total slurry Of 29%. When three refiners connected in series are arranged on the pulp line, the power ratio of the three refiners along the flow direction of the slurry is 25:35:40. After refining, the freeness of the long fiber pulp in the long fiber refining line reached 461ml, and the freeness of the mixed pulp of long fiber and short fiber in the short fiber refining line reached 434ml. Under the premise that the speed ratio of the slurry to the network is greater than 1, reduce the speed of the slurry supply pump.
[0036] The grammage of the paper prepared in Example 3 is 100g, the burst strength reaches 352kPa, and the burst strength is much higher than the national standard (exceeding the target burst stren...
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