Reacted Cellulose Fiber Sheets for High-Speed Continuous Coating
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Solution Overview
Problem
Existing methods for producing cellulose nanofibers with introduced anionic groups are not suitable for mass production, as they require cellulose fibers in an aqueous dispersion.
Innovation Solution
A method utilizing papermaking technology to produce a strip-shaped pulp sheet, which is then coated with a reaction agent, followed by continuous on-machine steps at high speeds, to achieve mass production of reacted cellulose fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cellulose fibers are kept in aqueous dispersion for reaction, then reaction can proceed, but mass production is not suitable due to low efficiency
Solution Approach 1:
The invention changes the physical state parameter of cellulose fibers from aqueous dispersion to dry sheet form. This parameter change enables the use of papermaking technology for continuous processing, thereby improving production efficiency while maintaining reaction effectiveness through controlled moisture content (10-60%) in the sheet
Solution Approach 2:
The invention introduces a paper sheet as an intermediary carrier for cellulose fibers. The sheet structure with controlled moisture content serves as a mediator that allows reaction agents to effectively contact cellulose fibers while enabling continuous high-speed processing, thus resolving the contradiction between reaction effectiveness and production efficiency
2Productivity
If papermaking technology is used for producing reacted cellulose fibers, then mass production becomes feasible, but the pulp sheet must be optimized for this specific application
Solution Approach 1:
The invention applies local quality by optimizing specific parameters of the pulp sheet for the reaction application. The moisture content is controlled within 10-60%, and the sheet is designed with appropriate porosity and surface properties to facilitate reaction agent penetration, while other parameters can be adjusted according to specific product requirements
Solution Approach 2:
The invention makes papermaking technology universally applicable to produced reacted cellulose fibers by creating a versatile sheet structure that can accommodate different reaction agents and cellulose sources. The standardized sheet format enables continuous processing while maintaining flexibility for various applications
3Productivity
If continuous on-machine steps are used at high speed, then productivity increases, but coating uniformity must be maintained
Solution Approach 1:
The invention applies dynamics by using continuous moving sheet processing at high speeds (300-3000 m/min). The sheet moves continuously through coating, drying, and reaction zones, with parameters dynamically controlled to maintain uniformity despite high speed. The moisture gradient and reaction conditions are optimized for the moving sheet to ensure consistent coating quality
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
Enables the efficient and uniform application of reaction agents to cellulose fibers, facilitating high-speed production of reacted cellulose fibers and fine fibers with improved properties.
Implementation Method 1
reacting the reaction agent with the cellulose fibers
Data Source
AI summary
A method for producing a cellulose fiber-containing material, a method for producing reacted cellulose fibers, and a method for producing reacted fine fibers, applicable to mass production, are provided. The method for producing cellulose fiber-containing material P2 for use as cellulose fibers containing a reaction agent for obtaining reacted cellulose fibers P3 from cellulose fibers containing the reaction agent, includes subjecting raw material pulp to papermaking to obtain a strip-shaped pulp sheet having a Cobb sizing degree of 10 to 600 g/m2 as measured in accordance with JIS P 8140, and coating the pulp sheet with the reaction agent. Using the cellulose fiber-containing material P2 thus obtained, reacted cellulose fibers P3 are produced by reacting the reaction agent with the cellulose fibers. Reacted fine fibers P4 are produced by making the ash content of raw material pulp P1 to 20 mas % or lower and defibrating the reacted cellulose fibers P3.