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Composition, its use and method for removing and preventing wet strength resins from contaminating papermaking equipment

A technology of papermaking equipment and composition, applied in the fields of removing wet strength resin pollutants in papermaking equipment and preventing it from polluting papermaking equipment, its use and method, capable of solving the problems of inapplicable safe handling, non-biodegradable, non-compliance Problems such as regeneration, to achieve the effect of preventing wet strength resin from contaminating papermaking equipment, high cleaning efficiency or cleaning ability

Active Publication Date: 2020-02-11
KEMIRA OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These chemical products are corrosive, non-renewable or non-biodegradable, and not suitable for safe disposal
Additionally, these products not only remove wet strength resin contamination, but can damage the felt itself

Method used

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  • Composition, its use and method for removing and preventing wet strength resins from contaminating papermaking equipment
  • Composition, its use and method for removing and preventing wet strength resins from contaminating papermaking equipment
  • Composition, its use and method for removing and preventing wet strength resins from contaminating papermaking equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1: Cleaning Wet Press Felt

[0052] Four sets of felt samples were used in this study, each set containing 2 samples. A circular felt sample approximately 2 inches in diameter was randomly die cut from the felt bulk sample. Three groups were from tissue and towel manufacturing plants (Paper Mills 1-3). The rest were virgin felt (VF) contaminated with PAE in the laboratory. The circular cut virgin felt samples were soaked in PAE solution and then heated in an oven at 105 °C for 2.5 h to promote crosslinking.

[0053] Each felt sample was washed and tested individually. The felt samples were washed with a tergotometer. Collect loose fibers between wash and rinse cycles. The fiber collection was rolled into pellets, dried, weighed, and recorded as "Fiber Loss" in the results. The reported results for contaminant removal are corrected for fiber loss.

[0054] One felt sample from each group was washed with 5% (w / w) of Composition A (Table 1). Dilute the comp...

Embodiment 2

[0061] Example 2: Preventing Wet Strength Resin Contamination of Wet Press Felt.

[0062] Cut a sample of raw felt approximately 2 inches in diameter with a standard die cutter. One set of samples was then placed in a 10% (w / w) aqueous solution of Composition A and the other set in water was used as a control. The samples were soaked at room temperature for five minutes and then dried overnight (16 hours) in a 45°C oven. Dilute the wet strength chemical PAE with deionized water. The dried soaked felt was placed in a diluted PAE solution (2.5%, w / w) and soaked at room temperature for five minutes, then dried in an oven at 45°C for 6.5 hours, and then cross-linked in an oven at 90°C 4.5 hours. The felt was washed in an oscillating detergent for 30 minutes in 600ml tap water at a temperature of 60°C at a speed of 150rpm ( figure 1 ). Fiber loss, porosity and water absorption rate were measured by the method described in Example 1. The percent weight gain is calculated as

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PUM

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Abstract

Compositions and methods for cleaning wet strength resin contamination from papermaking equipment and / or for preventing wet strength resins from contaminating papermaking equipment using the compositions are disclosed. The compositions comprise an aqueous solution of a weak organic acid; a surfactant, preferably a nonionic surfactant, a divalent metal ion containing catalyst and optionally a glycol ether containing solvent.

Description

technical field [0001] The present invention relates to compositions and methods for removing wet strength resin contamination in papermaking equipment and / or preventing wet strength resin contamination of papermaking equipment. [0002] Background of the invention [0003] Wet strength resins are the main additives used in the papermaking process. Using wet-strength resins, such as polyamide-epichlorohydrin (PAE), can lead to a build-up of cross-linking chemicals and fouling of wet press felts, causing the felt to lose permeability and slow water absorption over time. Paper mills spend time and money cleaning fouled felts and even have to replace them frequently. [0004] Chemical products currently used for wet press felt cleaning or to remove wet strength resin contamination are highly corrosive or acidic. These chemical products are corrosive, not renewable or biodegradable, and not suitable for safe disposal. Additionally, these products not only remove wet-strength r...

Claims

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Application Information

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IPC IPC(8): D21H21/02D21H21/04D21C9/00D21H21/20
CPCD21C9/008D21H21/02D21H21/04D21H21/20
Inventor 邹勇罗玉萍A·卡萨叙
Owner KEMIRA OY
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