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Process for improving dry strength and drainage of paper and paperboard

a technology of dry strength and drainage, applied in the field of manufacturing process of paper, paperboard, corrugated products, can solve the problems of no longer being usable glyoxylated polymer, affecting the dry strength of paper and paperboard, and suffering noticeable loss of efficiency, so as to improve the dry strength of the resulting paper product, improve the drainage effect, and improve the effect of drainag

Inactive Publication Date: 2006-07-27
PARADIGM CHEM & CONSULTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] It is a further aspect of at least one embodiment of the present invention to provide for a process for introducing glyoxal to various reactive polymers, starches, gums, etc., to produce a cross-linked dry strength resin having excellent drainage properties and which can be applied in situ in a paper mill operation.
[0012] It is a further aspect of at least one embodiment of the present invention to employ a metering system for a glyoxal stock solution and a base polymer to produce a freshly prepared glyoxylated polymer working solution of between about 4% to about 6% solids concentration. The working solution is useful for incorporation into a thick paper stock solution having between about 2% to about 5% solids and thereby achieve an increase in dry strength of the resulting paper product. The working solution can also be used to improve drainage properties in a thin paper stock having solids of less than about 1%.
[0013] It is a further aspect of at least one embodiment of the present invention to provide for a working solution of a glyoxylated additive in a papermaking process which reduces the tendency of the reaction product to form undesired gels.

Problems solved by technology

However, glyoxylated polymer solutions, even at the commonly used concentration levels, suffer a noticeable loss of efficiency following three to four weeks of storage.
Once gelling occurs, the glyoxylated polymer is no longer usable, and the equipment affected by the gelled glyoxylated polymer must be cleaned and reconditioned.

Method used

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  • Process for improving dry strength and drainage of paper and paperboard
  • Process for improving dry strength and drainage of paper and paperboard
  • Process for improving dry strength and drainage of paper and paperboard

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] The effect of gyloxylation on polyacrylamides with varying chain lengths was determined with respect to drainage properties of a paper furnish. The laboratory conditions utilized are representative of a glyoxylation process that may be used on site in a paper mill. The following procedures were used and the results are set forth below.

[0024] Three types of polyacrylamide polymers supplied by Aquaserv, Memphis, Tenn., were selected as referenced in Table 1 below. As noted, samples PCV 005 and PCV 015 are nonionic polymers while the PCV 105 polymer has a 10% cationic charge. The polymers used were prepared using dry powders which were dispersed in deionized water at a 1.7% solids concentration. Thereafter, glyoxal supplied by Noveon, Charlotte, N.C., at a 40% solids concentration was slowly added to the polymer solution while stirring to produce a 25:75 glyoxal to polymer ratio, on a solids basis, for each reactant. The resulting solution was adjusted to a pH of between 7.8 to...

example 2

[0033] The ability of freshly glyoxylated polymers to improve drainage properties of a commercial paper furnish having a clean, open water system was also evaluated. The polymer used to evaluate drainage improvements was a copolymer consisting of a 93 mol percent of dimethyldiallyl ammonium chloride (DADMAC) and a 7 mol percent of polyacrylamide. This copolymer was obtained in an aqueous solution, therefore, it did not require dispersion in water. The glyoxylation process used was otherwise identical to that described in Example 1.

[0034] The paper furnish used was obtained from the headbox of a commercial paper machine making kraft multi-wall bag paper material. The furnish composition was a mixture of 80% unbleached, refined virgin kraft Southern Pine pulp blended with 20% old corrugated containers.

[0035] The furnish was separated into four samples as set forth in Table 3. A portion of the furnish was introduced into a Britt jar at a propeller rotation of 800 rpm, and using a scr...

example 3

[0038] The effect of the copolymer charge on drainage and floc formation was also evaluated using glyoxylated copolymers. As set forth in Table 4, the identified copolymers were used as the starting material and obtained in a liquid form. Glyoxal was added to the copolymer to achieve a 15:85 glyoxal to polymer ratio. The solution was adjusted to a pH of between 7.8 to 8.0 using dilute sodium hydroxide as described in Example 1 above. The glyoxylated copolymers were used at a level equivalent to 5 pounds of glyoxylated polymer per ton of fiber, though it is believed that a useful concentration of 3 to 5 pounds of glyoxylated polymer per ton of fiber is a useful range.

TABLE 4Polymer Identification% Polyacrylamide% DADMACCPC 1070793PC 60505050PC 60109010

[0039] The paper furnish was prepared in a laboratory using defiberized paper stocks of 98% old corrugated container and 2% old newsprint. The drainage test procedures set forth in Example 1 were used and the results set forth below i...

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Abstract

A process is provided of providing glyoxylated polymer additives to a paper making process which brings about improvements in drainage properties of a cellulosic pulp material along with the ability to increase the dry strength of a resulting paper product. The process uses concentrated glyoxal to generate a working solution of a glyoxylated polymer additive which can be generated on site in a paper mill and used within a 24 to 48 hour interval. The ability to glyoxylate polymers in a working solution concentration provides for a more active additive and which can be supplied in a more economical fashion than conventional glyoxylated polymers.

Description

RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Provisional Application Ser. No. 60 / 646,341, filed on Jan. 24, 2005, and which is incorporated herein by reference.FIELD OF THE INVENTION [0002] This invention is directed towards the manufacturing process of paper, paperboard, corrugated products, and other fiber-containing products such as gypsum board / drywall and fiber-based backing for vinyl flooring. This invention further relates to additives used in the wet end of a papermaking process to confer dry strength to the resulting product. An additional aspect of one aspect of the invention is a process which improves manufacturing efficiency by promoting increased drainage during fiber processing. BACKGROUND OF THE INVENTION [0003] Within the papermaking art, it is known to add cationic starches during fiber processing / manipulation so as to achieve an improved retention of cellulosic fines, filler, and / or pigment within the fiber product and to also bring abou...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21H21/10D21H21/18D21H17/55
CPCC08F265/10C08L51/003D21H17/06D21H17/28D21H17/29D21H17/375D21H21/10D21H21/18C08L2666/02
Inventor SMITH, WILLIAM E.MEIER, JEFFREY J.
Owner PARADIGM CHEM & CONSULTING
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