Paper-making aid composition for ash retention
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Solution Overview
Problem
Existing paper-making processes struggle to effectively improve ash retention in finished paper while maintaining strength properties, particularly when using existing strengthening agents and methods.
Innovation Solution
Adjusting the pH value of an aqueous liquid containing dialdehyde-modified polyacrylamide-type strengthening agents and polyacrylamide-type strengthening agents to 6.0 or more during the paper-making process to enhance ash retention in finished paper.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If existing strengthening agents (dialdehyde-modified polyacrylamide and polyacrylamide) are used without pH adjustment, then strength properties are maintained, but ash retention in finished paper is insufficient
Solution Approach 1:
The patent applies parameter changes by adjusting the pH value of the aqueous liquid to 6.0 or more, which fundamentally alters the chemical environment to improve ash retention. This parameter modification enables the strengthening agents to function more effectively in retaining ash in the finished paper without requiring complex additional process steps.
Solution Approach 2:
The patent implements preliminary action by adjusting the pH value before the strengthening agents are added to the pulp slurry. This pre-adjustment ensures that the chemical conditions are optimal for ash retention from the beginning of the paper-making process, allowing the strengthening agents to work more effectively without requiring post-processing modifications.
2Quantity of substance
If pH value is adjusted to 6.0 or more, then ash retention is substantially increased, but process complexity increases
Solution Approach 1:
The core of the invention lies in changing the pH parameter to 6.0 or more, which creates favorable conditions for ash retention. This single parameter change is sufficient to substantially increase ash retention in the finished paper while maintaining compatibility with existing strengthening agents and paper-making processes.
3Quantity of substance
If existing strengthening agents are used without pH adjustment, then process simplicity is maintained, but strength properties and ash retention cannot be simultaneously optimized
Solution Approach 1:
By adjusting the pH value to 6.0 or more, the patent creates optimal conditions that simultaneously enhance both ash retention and strength properties. The modified chemical environment allows the strengthening agents to perform better in both retaining ash and providing mechanical strength to the paper.
Solution Approach 2:
The preliminary pH adjustment ensures that both ash retention and strength properties are optimized from the start of the paper-making process. This pre-conditioning of the aqueous liquid allows the strengthening agents to achieve dual benefits without requiring separate treatment steps.
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
Substantially increases ash retention in finished paper compared to processes not adjusting the pH value, while maintaining or improving strength properties.
Implementation Method 1
dialdehyde-modified polyacrylamide-type strengthening agents and polyacrylamide-type strengthening agents
Implementation Method 2
adjusting the pH value of an aqueous liquid containing dialdehyde-modified polyacrylamide-type strengthening agents and polyacrylamide-type strengthening agents to 6.0 or more
Data Source
AI summary
The invention provides a paper-making aid composition comprising dialdehyde-modified polyacrylamide-type strengthening agent(s), polyacrylamide-type strengthening agent(s) and water as medium and having a pH value of 6.0 or more. The invention also provides a method for paper-making by using the above mentioned paper-making aid composition.