Cellulose Filament Winding With Partial Washing and Coiled Drying
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Solution Overview
Problem
Existing cellulose filament production processes face inefficiencies in solvent recovery and filament quality due to stringent environmental regulations, leading to quality defects and high operational costs, particularly in the lyocell process.
Innovation Solution
A device and method for producing cellulose filaments that omit or minimize solvent washing and drying before winding, allowing the filaments to be wound while still containing solvent, followed by partial washing and drying in a coiled form, enhancing filament strength and plasticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If complete solvent washing and drying is performed before winding, then filament quality is improved, but production time and energy consumption increase
Solution Approach 1:
The patent performs preliminary washing and drying actions during the coagulation process itself, rather than as separate post-processing steps. The coagulation bath is designed to simultaneously solidify the filament and remove solvent, and the filament is dried in situ on the spool before complete solidification, thereby reducing total production time while maintaining quality
Solution Approach 2:
The patent establishes a continuous process where solvent removal, drying, and winding occur in an integrated sequence without interruption. The filament is continuously dried on the rotating spool and continuously wound, eliminating idle time between processing stages and maintaining constant productive action throughout the manufacturing cycle
2Manufacturing precision
If complete solvent washing and drying is performed before winding, then filament quality is improved, but energy consumption increases
Solution Approach 1:
The patent performs preliminary drying actions during the coagulation process itself, rather than as separate post-processing steps. The filament is dried in situ on the spool before complete solidification, thereby reducing total energy consumption while maintaining quality
Solution Approach 2:
The patent establishes a continuous process where solvent removal, drying, and winding occur in an integrated sequence without interruption. The filament is continuously dried on the rotating spool and continuously wound, eliminating idle time between processing stages and maintaining constant productive action throughout the manufacturing cycle
3Loss of substance
If washing unit is included in the device, then solvent recovery is improved, but device complexity increases
Solution Approach 1:
The patent merges the washing function with the coagulation unit and the drying function with the winding unit. The coagulation bath simultaneously solidifies the filament and removes solvent, and the filament is dried in situ on the rotating spool during winding, thereby reducing device complexity while maintaining solvent recovery effectiveness
Solution Approach 2:
The patent designs the coagulation unit to perform multiple functions (solidification and solvent removal) and the winding unit to perform multiple functions (winding and in situ drying). This multi-functionality reduces the need for separate dedicated units, thereby simplifying the overall device structure while maintaining effective solvent recovery
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
This approach increases filament elongation by up to 50% and strength by up to 20%, improving processing efficiency and reducing filament defects, while simplifying further processing and reducing chemical usage.
Implementation Method 1
a coagulation unit for solidifying the filaments
Implementation Method 2
where solvent exchange takes place, resulting in the precipitation of the initially dissolved cellulose as thread-like products
Implementation Method 3
a partial washing unit for washing the cellulose filaments or for extracting a cellulose solvent from the cellulose filaments
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a device for solidifying and winding cellulose multifilaments, comprising an extrusion unit with at least 10 openings for forming filaments, a coagulation unit for solidifying the filaments, and a thread winder for winding the cellulose filaments, characterized in that the device contains no or only a partial washing unit for washing the cellulose filaments or for extracting a cellulose solvent from the cellulose filaments between the coagulation unit and the thread winder; and a method for winding cellulose multifilaments.