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Process for sizing paper

A technology of sizing agent and accelerator, applied in the field of paper sizing, which can solve the problems of high cost and increased accumulation of sizing agent

Inactive Publication Date: 2003-10-15
AKZO NOBEL NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Increased levels of added sizing agent often improve sizing, however resulting in higher cost and increased accumulation of sizing agent in white water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The sizing performance of the process was evaluated by using the cobb 60 test.

[0070] An anionic sizing dispersion containing alkyl ketene dimer, condensed naphthalene sulfonate and di(hydrogenated tallow) dimethyl ammonium chloride was prepared. The size dispersion had an AKD content of 30% and contained 4% bis(hydrogenated tallow) dimethyl ammonium chloride and 6% condensed naphthalenesulfonate, based on AKD. The sizing dispersion is added to the paper stock in an amount of 5kg AKD / ton of dry paper stock.

[0071] Cationic starch (available under the trademark Tamol(R)), having a degree of cationic substitution with respect to nitrogen of 0.065, containing benzyl groups and / or condensed naphthalenesulfonates, was further added to the furnish, included in the size accelerator. In addition, optional additional components included in the size accelerator are added to the paper stock. These components are listed in Table 1, including cationic starch with a DS of 0.065 ...

Embodiment 2

[0075] Using the same anionic sizing dispersion, the same sizing accelerator and the same paper stock as in Example 1, the sizing performance of the process was evaluated (cobb 60 test), however, the addition of calcium chloride to the paper stock adjusted the conductivity The rate is 5000 μS / cm. The amount of polymer added in the accelerator and sizing agent (AKD) is shown in Table 2.

[0076] Test No.

Embodiment 3

[0078] An anionic starch containing 8.9% of a commercial alkyl ketene dimer, 0.89% aryl-substituted cationic starch (which has a degree of substitution of 0.065 and contains benzyl groups) and 0.22% condensed naphthalenesulfonate (available under the trademark Tamol®) was prepared. glue dispersion. Based on ketene dimer, the anionic dispersion was added to a cellulose suspension containing 30% Pine, 30% Bee, 40% Eucaluptus and 15% precipitated calcium carbonate (dry basis) in an amount of 0.0115%-0.0140 (dry basis). )middle. The conductivity of the suspension was 500 μS / cm. To this suspension was also added a sizing accelerator (test 2) containing benzyl-substituted starch (which had a DS of 0.065) and condensed naphthalenesulfonate (available under the trademark Tamol(R)). To the same suspension was also added the same anionic dispersion. However, the sizing accelerator added to the suspension does not contain aromatic polymers. The sizing accelerator contained cationic s...

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Abstract

The present invention refers to a process for sizing paper which comprises adding to an aqueous suspension containing cellulosic fibres, and optional fillers, (i) a sizing dispersion comprising a sizing agent and a polymer having one or more aromatic groups, and (ii) a sizing promoter comprising a polymer having one or more aromatic groups, forming and draining the obtained suspension, wherein the sizing dispersion and the sizing promoter are added separately to the aqueous suspension.

Description

field of invention [0001] The present invention relates to a process for sizing paper comprising adding a sizing dispersion and a sizing accelerator to a suspension containing cellulosic fibers and optionally fillers, the sizing dispersion comprising a sizing agent and having one or more A polymer of two aryl groups, the sizing accelerator comprising a polymer having one or more aryl groups; forming and discharging the resulting suspension, wherein the sizing dispersion and the sizing accelerator are added separately to the aqueous suspension in the liquid. Background technique [0002] Dispersions or emulsions of sizing agents are used in papermaking to impart improved moisture and penetration resistance to various liquids in paper and paperboard. The sizing dispersion is usually added to a suspension containing cellulosic fibres, optional fillers and various additives. The aqueous suspension is conveyed into a headbox which sprays the dispersion onto the wire on which th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H23/76D21C3/00D21H17/14D21H17/17D21H17/21D21H17/24D21H17/29D21H17/42D21H17/45D21H17/47D21H17/58D21H19/10D21H21/10D21H21/16
CPCD21H23/765D21H21/16D21H17/47D21H17/29
Inventor E·林德格仁S·福罗里克M·珀森B·马格纽森
Owner AKZO NOBEL NV