Foam-Assisted Strength Additive Application in Paper Manufacturing
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Solution Overview
Problem
Conventional wet-end addition of strength additives in paper manufacturing is limited by high water content, leading to reduced effectiveness due to contamination and limited dosage, which restricts the improvement of paper strength properties.
Innovation Solution
A foaming formulation comprising a foaming agent and a synthetic strength additive with a cationic functional group is applied to a wet embryonic web, creating a foam that enhances the retention and distribution of the additive, thereby improving fiber bonding and paper strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If wet-end addition of strength additives is used in conventional paper-making, then the additives can be introduced into the pulp at the stock preparation section, but the effectiveness is reduced due to high water content and contamination
Solution Approach 1:
The patent applies foam-assisted addition where the strength additive is incorporated into a foam phase rather than being dissolved in the aqueous pulp stock. The foam bubbles carry the additive to the paper web surface, allowing the additive to be delivered in a different physical phase (gas-liquid foam) that avoids contamination from the high-water-content pulp environment. This phase transition approach enables higher effective concentrations and improved additive performance.
2Strength
If wet-end addition is used, then chemical additives can be added to the pulp, but the dosage is limited which restricts improvement of paper strength properties
Solution Approach 1:
The patent uses foam as an intermediary carrier to deliver the strength additive to the paper web. The foam acts as a mediator between the additive and the pulp stock, allowing the additive to be applied in a controlled manner at higher dosages. The foam bubbles serve as vehicles that can carry concentrated amounts of additive without being diluted by the surrounding water, thereby enabling higher effective dosages that improve paper strength properties beyond what is achievable with conventional wet-end addition.
3Strength
If foam-assisted application is used, then higher concentrations of additives can be effectively incorporated, but the process complexity increases
Solution Approach 1:
The patent integrates foam generation and additive delivery into a single multi-functional process step. The foam-assisted addition system combines the functions of additive dissolution, foam generation, and additive application to the paper web in one integrated operation. This multi-functionality reduces the need for separate equipment and process steps, making the increased complexity manageable while achieving superior paper strength properties through higher additive concentrations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The foam-assisted application of strength additives increases paper strength properties by allowing higher concentrations of additives to be effectively incorporated into the paper sheet, overcoming the limitations of traditional wet-end addition, including improved dry and wet tensile strength, bursting strength, and tensile energy absorption.
Implementation Method 1
A foaming formulation comprising a foaming agent and a synthetic strength additive with a cationic functional group is applied to a wet embryonic web, creating a foam that enhances the retention and distribution of the additive
Implementation Method 2
a synthetic strength additive with a cationic functional group is applied to a wet embryonic web, creating a foam that enhances the retention and distribution of the additive, thereby improving fiber bonding and paper strength
Data Source
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AI summary
A foaming formulation is provided herein. The foaming formulation includes at least one foaming agent in an amount of from about 0.001% to about 10% by weight based on a total weight of the foaming solution. The foaming formulation further includes a synthetic strength additive having a cationic functional group in an amount from about 0.01% to about 50% by weight based on a total weight of the foaming solution. The foaming formulation further includes water.