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Papermaking furnish comprising solventless cationic polymer retention aid combined with phenolic resin and polyethylene oxide

a technology of phenolic resin and phenolic resin, which is applied in the field of papermaking furnish, can solve the problems of reducing performance, adverse effects of dissolved and colloidal contaminants, and the inability of phenolic resin/peo retention and drainage system to be adopted in mills producing grades, etc., to achieve better fines/filler retention, improve the dispersion of filler, and improve the speed of sheet drainage and machine speed

Inactive Publication Date: 2006-01-05
POLVERARI MARCO +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] Is is an object of the present invention to provide a papermaking furnish with increased retention rate and drainage based on the phenolic resin / PEO retention system.
[0011] A further object is to provide a method of increasing retention rate and drainage in a papermaking furnish while also maintaining good sheet quality at reduced cost.

Problems solved by technology

In contrast, cationic polyacrylamides, which are also commonly used as retention aids, are adversely affected by dissolved and colloidal contaminants found in mechanical pulp.
Nevertheless, despite the above advantages, the phenolic resin / PEO retention and drainage system has not been adopted in mills producing grades such as highly filled specialty mechanical paper, fine paper (where mechanical pulp from softwood does not form a large part of the furnish), and tissue and packaging papers.
The main reason for the lack of success of the phenolic resin / PEO system in the above areas is the reduced performance owing to the lack of organic contaminants in these furnishes compared to the softwood mechanical pulp used in many newsprint applications.
In addition it has been found that residual silicate in the pulp from some bleaching and de-inking operations sometimes has an adverse effect on polyethylene oxide causing a loss of retention or drainage.

Method used

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  • Papermaking furnish comprising solventless cationic polymer retention aid combined with phenolic resin and polyethylene oxide
  • Papermaking furnish comprising solventless cationic polymer retention aid combined with phenolic resin and polyethylene oxide

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0044] A 1.06% cellulosic fibre slurry consisting of 50% TMP (thermo mechanical pulp-hydrosulfonate bleached), 20% DIP (de-inked pulp) and 30% broke was taken from a newsprint mill. The slurry had a clay filler content of 20%. The pH of the slurry was set at 4.5.

[0045] For retention and turbidity tests a Dynamic drainage jar (DDJ) was used with a baffled cylinder and the speed of the stirrer was set at 550 rpm. A 500 ml sample was used for testing. FPR indicates the first pass retention.

[0046] For drainage, formation, and retention (with pad formation) tests a Dynamic Drainage Analyzer (DDA) was used with a baffled cylinder and the speed of the stirrer was set at 1000 rpm. A 800 ml sample was used for testing. The vacuum was set at 500 mBar.

[0047] Tables 1 and 2 below show the results when conventional phenol formaldehyde resin-polyethylene oxide retention system is compared to phenol formaldehyde resin-polyethylene oxide-solventless cationic polymer flocculant retention system. ...

example 2

[0049] A 0.992% cellulose fibre slurry consisting of 10% Kraft and 90% TMP (thermo mechanical pulp-hydrosulfite bleached) was taken from a specialty newsprint mill. The slurry had a clay filler content of 10%. The pH of the slurry was set at 6.0

[0050] For drainage, formation, and retention (with pad formation) tests a Dynamic Drainage Analyzer (DDA) was used with a baffled cylinder and the speed of the stirrer was set at 1000 rpm. A 800 ml sample was used for testing. The vacuum was set at 500 mBar.

[0051] Table 3 below shows the results when conventional phenol formaldehyde resin-polyethylene oxide retention system is compared to phenol formaldehyde resin-polyethylene oxide-solventless, cationic polymer flocculant retention system.

TABLE 3DDA TESTINGNormalizedProductProductProductProductProductProductRetentionDrainageCostNameDose (g / t)NameDosage (g / t)NameDosage (g / t)(%)(sec)(0 to 100)Blank0000078.8783.930Solventless Polymer Flocculant added before Phenolic resin and PEOSolventles...

example 3

[0052] A 1.12% cellulose fibre slurry consisting of 5% Kraft, 70% TMP (thermo mechanical pulp-hydrosulfite bleached) and 25% deinked pulp (DIP) was taken from a specialty newsprint mill using recycled fibres. The slurry had a clay filler content of 30%. The pH of the slurry was set at 6.2

[0053] For retention and turbidity tests a Dynamic drainage jar (DDJ) was used with a baffled cylinder and the speed of the stirrer was set at 550 rpm. A 500 ml sample was used for testing. FPR refers to the first pass retention and FPAR the first pass ash retention.

[0054] Table 4 below shows the results when conventional phenol formaldehyde resin-polyethylene oxide retention system is compared to phenol formaldehyde resin-polyethylene oxide-solventless, cationic polymer flocculant retention system.

TABLE 4DDJ TESTINGNormalizedProductProductProductProductProductProductFPR / FPARTurbidityCostNameDose (g / t)NameDosage (g / t)NameDosage (g / t)(%)ntu(0 to 100)Blank0000035.6 / 45.486.10Solventless Polymer Flo...

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Abstract

A papermaking furnish is provided with a phenolic resin / polyethylene oxide retention system in combination with a solventless cationic polymer retention aid which increases retention rate and drainage in the paper sheet. The retention aid may be added to the furnish together with the phenolic resin or separately from it at a different point of addition. It can also be used for pretreating a filler which is added to the furnish.

Description

FIELD OF THE INVENTION [0001] This invention relates to papermaking. More particularly, it relates to a papermaking furnish that comprises a solventless cationic polymer retention aid in combination with phenolic resin and polyethylene oxide (PEO) to increase retention and / or drainage in the furnish. BACKGROUND OF THE INVENTION [0002] In the manufacture of paper, an aqueous suspension of cellulosic fibers, optionally containing a filler and cationic starch, as well as other papermaking chemicals, is spread over a wire or cloth and water is removed therefrom to form a fiber web or sheet. Such aqueous suspension or slurry is called “papermaking furnish”. The removal of water or dewatering of the furnish as well as retention of fines, fillers and other papermaking chemicals in the paper sheet are very important to the efficient recovery and production rate and to the cost of manufacture of the paper and its quality. [0003] It is well known to use a combination of phenolic resin and pol...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21H23/76D21H21/10
CPCD21H23/765D21H21/10
Inventor POLVERARI, MARCOVU, JOSEPHASTON, DAVID
Owner POLVERARI MARCO
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