Antibacterial Paper Calcium Flexibility Water Hardness
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Solution Overview
Problem
Conventional antibacterial papers face challenges in achieving both flexibility and effective antibacterial performance due to the adverse effects of high water hardness on antibacterial agent efficacy and paper structure, leading to issues like clogging and impaired sterilization performance.
Innovation Solution
The development of antibacterial paper manufacturing method involving wet papermaking with high hardness water (5° dH or more) to increase calcium content and flexibility, while using a dilution water with lower hardness than papermaking water to prevent metal ion reactions and maintain antibacterial agent effectiveness, incorporating a cationic antibacterial agent like benzalkonium salts for enhanced bacterial suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If water with high hardness is used for wet papermaking to increase calcium content and flexibility, then paper flexibility is improved, but antibacterial agent performance deteriorates due to metal ion reactions
Solution Approach 1:
The patent divides the water usage into two distinct segments: papermaking water (with high hardness ≥5°dH for flexibility) and dilution water (with low hardness for antibacterial agent preparation). This segmentation allows each water type to fulfill its specific function without interfering with the other, resolving the contradiction between flexibility and antibacterial performance
Solution Approach 2:
Different quality requirements are applied to different parts of the manufacturing process: the papermaking process requires high hardness water for calcium content and flexibility, while the antibacterial agent application requires low hardness water to prevent metal ion reactions. This local quality differentiation enables both flexibility and antibacterial effectiveness
2Reliability
If conventional low hardness water is used for papermaking, then antibacterial agent performance is maintained, but paper flexibility deteriorates due to insufficient calcium content
Solution Approach 1:
The manufacturing process is segmented into two water usage stages with different hardness requirements. The papermaking stage uses low hardness water to maintain antibacterial performance, while a separate calcium treatment stage adds calcium compounds to achieve the desired flexibility without compromising antibacterial agent effectiveness
Solution Approach 2:
The calcium content is controlled during the papermaking process itself by using low hardness water, and then calcium compounds are added in a subsequent treatment step. This preliminary control of water hardness followed by targeted calcium addition ensures both antibacterial performance and flexibility are achieved
3Shape
If high hardness water is used for both papermaking and dilution, then paper flexibility is improved, but clogging occurs and antibacterial performance is impaired
Solution Approach 1:
The patent segments water usage into papermaking water and dilution water with different hardness characteristics. The dilution water is specifically selected to have low hardness to prevent metal ion reactions with the antibacterial agent and avoid clogging in application equipment, while papermaking water can have higher hardness for flexibility
Solution Approach 2:
The patent introduces a specific water quality parameter (hardness) as an intermediary control variable. By controlling the hardness of dilution water to be lower than that of papermaking water, it mediates between the conflicting requirements of flexibility (needing high hardness) and preventing clogging/metal ion reactions (needing low hardness)
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 method produces antibacterial paper with improved flexibility and antibacterial activity, effectively suppressing bacteria and odor-causing microorganisms, suitable for use in absorbent products without compromising skin safety or paper strength.
Implementation Method 1
forming a wet paper web by wet papermaking using a papermaking water having a Water hardness of 5° dH or more
Implementation Method 2
a drying step of heating and drying the wet paper web
Data Source
AI summary
The antibacterial paper of the present invention contains an antibacterial agent, and the calcium content per 0.1 g of the antibacterial paper is 500 ppm or more. A method for manufacturing an antibacterial paper of the present invention includes a papermaking step of forming a wet paper web by wet papermaking using a papermaking water having a Water hardness of 5° dH or more, an antibacterial agent applying step of applying an antibacterial agent-containing liquid prepared from an antibacterial agent and a dilution water thereof to the wet paper web, and a drying step of heating and drying the wet paper web after undergoing the antibacterial agent applying step. The Water hardness of the dilution water is equal to or less than the Water hardness of the papermaking water.