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On-line surface modification method of papermaking filling material

A technology of papermaking filler and surface modification, which is applied in papermaking, textile and papermaking, pulp raw material addition process, etc., can solve the problems of difficult to achieve commercial large-scale application, complex surface modification filler process, and unstable quality. Improved mechanical and optical properties, low cost, improved and effect of internal bond strength

Active Publication Date: 2012-02-29
HANGZHOU PAPERMATE SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface-modified filler obtained by this method is complex in process, high in production cost, and not stable in quality, making it difficult to achieve commercial large-scale application

Method used

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  • On-line surface modification method of papermaking filling material
  • On-line surface modification method of papermaking filling material
  • On-line surface modification method of papermaking filling material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This example is a single-layer paperboard papermaking process under typical laboratory conditions.

[0035] Prepare :

[0036] The unbleached softwood pulp and the waste containerboard pulp were thawed together at a ratio of 20:80 to prepare a mixed pulp with a concentration of 1%, and the beating degree of the pulp was 50 degrees. The filler is heavy calcium carbonate (GCC), the filler mesh is 200 mesh, the degree of substitution of cationic starch is DS: 0.020, the retention aid is cationic polyacrylamide, the cationic molar ratio is 15%, and the molecular weight is 8 million.

[0037] Steps :

[0038] Turn on the agitator of the laboratory pulping tank, the stirring speed is 60 rpm, and then add 314 grams of clear water, 3.14 grams of mixed pulp, 0.03 grams of cationic starch, 0.47 grams of filler, 50 ppm cationic polyacrylamide and the like. After stirring evenly, the prepared slurry is copied and formed in a laboratory handsheet forming machine, and the relev...

Embodiment 2

[0041] This example is a papermaking process using a jet mixing device to make pulp and make a single-ply board under laboratory conditions.

[0042] Prepare :

[0043] With embodiment 1.

[0044] Steps :

[0045] Open the laboratory jet mixing device, add 314 kg of clear water and 3.14 kg of mixed pulp, then adjust the jet flow velocity to 18 m / s, and adjust the disturbance flow velocity to 3 m / s. Then add 31.4 grams of cationic starch, 471 grams of filler, and 50 ppm cationic polyacrylamide etc. simultaneously by jet mixing device. After the jet mixing is completed, take out the wet pulp with the same absolute dry weight as in Example 1 from the prepared pulp, and copy it in a laboratory handsheet forming machine, and test the paper sample after pressing, dehydrating, drying, balancing and other steps related physical indicators.

[0046] In the laboratory dynamic water filter, the above-mentioned prepared slurry is dynamically filtered, and the total first-pass rete...

Embodiment 3

[0050] This example is the double-adhesive papermaking process under typical laboratory conditions.

[0051] Prepare :

[0052] Bleached softwood pulp, bleached hardwood pulp and bleached wheat straw pulp were jointly deflaked at a ratio of 20:30:50 to prepare mixed pulp with a concentration of 1%, and the pulp beating degree was 40 degrees. The filler is made of heavy calcium carbonate (GCC), the mesh number of the filler is 200 mesh, the cationic starch is gelatinized by the full gelatinization method, the cationic substitution degree DS: 0.030, the retention aid is made of cationic polyacrylamide, the cationic molar ratio is 15%, the molecular weight 800w.

[0053] Steps :

[0054] Turn on the agitator of the laboratory mixing tank, the stirring speed is 60 rpm, and then add 200 g of clear water, 2.20 g of mixed pulp, 0.02 g of cationic starch, 0.44 g of filler, 50 ppm of cationic polyacrylamide, etc. in sequence. After stirring evenly, the prepared slurry is copied ...

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Abstract

The invention relates to an on-line surface modification method of a papermaking filling material. The invention intends to provide a method for substantially improving the application amount of a cheap papermaking filling material and reducing the application amount of fiber during a papermaking process in order to achieve purposes of paper quality improving and production cost reducing. According to the invention, three components, which are a papermaking filling material water suspension with a concentration of 1 to 30%, a modified starch paste with a concentration of 0.5 to 2%, and a retention aid with a concentration of 0.1 to 0.3% are prepared in advance. With a filling material on-line surface-modifying jetting hybrid apparatus arranged on a paper machine on-mesh pulp delivering pipe, on-line mixing is realized, and the mixture is uniformly distributed in a papermaking pulp pipe, such that on-line surface composite modification upon the papermaking filling material can be carried out with the modified starch and the retention aid.

Description

technical field [0001] The invention relates to a method for continuous online surface modification of paper-making fillers. In particular, the modified starch and retention aids are used to carry out continuous online surface modification of paper fillers in paper mills by using a special jet mixing device. Background technique [0002] In the production process of filled paper, fillers are generally added to the papermaking slurry system before the headbox, and unit or dual retention aids are often added before and after the filler addition point to improve the retention of fillers on the forming wire. Adding fillers to the papermaking slurry not only helps to improve the physical indicators such as paper opacity, whiteness, hand feeling, and printing adaptability, but also accelerates the drying speed of wet paper sheets, saves the consumption of drying steam, and more importantly, Filler is far cheaper than paper fiber, and increasing the amount of filler used will help...

Claims

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Application Information

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IPC IPC(8): D21H17/69D21H17/29D21H21/10D21H17/55D21H23/18
Inventor 姚献平田清泉郑丽萍
Owner HANGZHOU PAPERMATE SCI & TECH
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