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Methods For Enhancing Paper Strength

Inactive Publication Date: 2014-05-01
BUCKMAN LAB INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a papermaking method that produces paper or paperboard with enhanced dry strength. This can be achieved by increasing the dry strength of the paper or paperboard either during the wet stage or after it has been dried. Additionally, this method requires lower amounts of additives and produces lower product volumes while maintaining quality. Furthermore, it also features economic and environmental benefits such as lower toxicity, recycling, and use of renewable resources, as well as lower energy requirements.

Problems solved by technology

While enzymes can appreciably increase the rate of chemical reactions, finding the right conditions to realize enzyme optimization has proved to be difficult.
That inefficiency can require the use of additional, often costly, enzymes, as well as longer production times and additional energy inputs.
Even with the use of enzymes, the resulting paper products can have insufficient dry strength.

Method used

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  • Methods For Enhancing Paper Strength
  • Methods For Enhancing Paper Strength
  • Methods For Enhancing Paper Strength

Examples

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example 1

[0049]This example demonstrates the surprising and unexpected results achieved by the methods of the present invention. 110 g / m2 paper was produced on a laboratory scale consistent with the methods of the present invention. Differing amounts of enzyme (BLX 13290) and polymer (Bubond® 408) were used to produce the paper. A ring crush test (RCT) and a tensile strength test were performed on the resulting paper. FIG. 1 is a bar graph and shows results of using enzyme and polymer to increase dry strength based on the RCT. The RCT index is shown in kN / m for the various treatments. FIG. 2 is a bar graph showing the percentage gain in dry strength based on RCT using polymer, enzyme, or a combination thereof. FIG. 3 is a bar graph showing the results of using enzyme and polymer to increase dry strength based on tensile index (kN / m) for the different treatments. FIG. 4 is a bar graph showing the percentage gain in dry strength based on tensile index using polymer, enzyme, or a combination th...

example 2

[0050]This example demonstrates the surprising and unexpected results achieved by the methods of the present invention. A trial was conducted to determine if an existing program could be replaced with a new program in order to increase dry strength increase at lower cost while maintaining or improving other desirable properties. The existing program involved use of cationic polyvinylamine (0.85 kg / metric ton on a dry basis) plus anionic polyvinylamine (0.9 kg / metric ton on a dry basis). The new program involved use of cationic glyoxal polyacrylamide (0.50 kg / metric ton on a dry basis) plus laccase product (0.5 kg / metric ton on a wet basis). BLX 13290 was used as the enzyme (laccase product) and Bubond® 408 was used as the polymer application for strength enhancement. The grade was corrugated medium and testliner, including 117MI, 117NO, 150UH, 165UH, 175UH, and 190UH. The furnish was 100% recycled unbleached fiber paper Paper was produced using a Fourdrinier one ply, two press secti...

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Abstract

Methods of making paper or paperboard having enhanced dry strength are provided. An enzyme and a polymer including at least one of a cationic water-soluble polymer and an amphoteric water-soluble polymer can be added to a papermaking pulp to yield a treated pulp. The treated pulp can then be formed into paper or paperboard having a dry strength greater than paper or paperboard formed from papermaking pulp without the addition of the enzyme and polymer. Any suitable enzyme can be used, for example, a laccase or a cellulase. Any suitable polymer can be used. For example, at least one of a glyoxylated polyacrylamide (gPAM), a polyvinylamine, a decarboxylated polyacrylamide, and a dimethylamine-epichlorohydrin (epi-DMA).

Description

[0001]This application claims the benefit under 35 U.S.C. §119(e) of prior U.S. Provisional Patent Application No. 61 / 712,030, filed Oct. 10, 2012, which is incorporated in its entirety by reference herein.BACKGROUND OF THE INVENTION[0002]The present invention relates to papermaking processes. More particularly, the present invention relates to a papermaking process and using at least one enzyme and at least one polymer to enhance the dry strength of paper and paperboard.[0003]Papermaking generally includes forming an aqueous pulp composition and then sheeting and drying the pulp to form a desired paper product. Enzymes can be added to the pulp to make the papermaking process more efficient and / or to yield paper products having desired characteristics. While enzymes can appreciably increase the rate of chemical reactions, finding the right conditions to realize enzyme optimization has proved to be difficult. As a consequence, when enzymes are used, they are used in a manner that yie...

Claims

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Application Information

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IPC IPC(8): D21H17/00
CPCD21H17/72D21H17/375D21H17/005D21H17/44D21H17/56D21H21/18
Inventor PORTO, RITA DE CASSIA BORTOTOGRAMINHA, ERIKA BARBOSA NEVESDOS SANTOS, JULIANO LOPESGONCALVES, TIAGO PEREIRA
Owner BUCKMAN LAB INT INC
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