Regenerated Cellulose Fiber Multi-Limbed Cross-Section Design
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Solution Overview
Problem
Current multi-limbed cellulose fibers do not achieve improved absorbency by simply increasing fiber titer, as the cross-sectional shape remains unchanged, limiting their liquid storage capacity and processing difficulties due to brittleness and adhesion issues.
Innovation Solution
The solution involves connecting multi-limbed basic shapes at their limb ends to create a larger fiber with increased titer, where the connecting limb is longer than the shortest limb by a factor of at least 1.5, forming larger hollow spaces for stable liquid storage, and using a modified spinneret with trilobal openings to produce fibers with enhanced cross-sectional areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multi-limbed fibers are produced by increasing fiber titer while maintaining the same cross-sectional shape, then the absorption capacity should increase, but the fibers become brittle and adhere to each other during processing
Solution Approach 1:
The fiber cross-section is segmented into multiple limbs (at least three) with specific length-to-width ratios, creating a multi-limbed structure that increases free volume and absorption capacity while maintaining structural integrity and processability
Solution Approach 2:
The fiber cross-section employs asymmetric multi-limbed geometry where limbs have different orientations and lengths, optimizing both absorption performance and mechanical properties to prevent brittleness and adhesion during processing
2Quantity of substance
If the length-to-width ratio of fiber limbs is increased to enhance absorption capacity, then liquid storage capacity improves, but the fibers become more difficult to process into carded fabric
Solution Approach 1:
The length-to-width ratio of fiber limbs is optimized within a specific range (2:1 to 10:1, preferably 3:1 to 5:1) to balance absorption capacity enhancement with maintainability of mechanical properties and processability into carded fabric
3Quantity of substance
If chemically modified cellulose fibers are used to increase absorption capacity, then absorption performance improves, but toxicological testing requirements increase cost and time
Solution Approach 1:
Physical and geometric parameters of the fiber (multi-limbed cross-section, limb dimensions, free volume) are modified instead of chemical composition, achieving enhanced absorption capacity while avoiding chemical modifications that would require extensive toxicological testing
4Quantity of substance
If hollow fibers are used to increase absorption capacity, then liquid storage improves, but the fibers swell strongly during washing and adhere to each other during drying
Solution Approach 1:
The fiber structure employs a multi-limbed cross-section with inherent free volume that provides liquid storage capacity while maintaining structural stability during washing and drying, preventing excessive swelling and adhesion through the specific geometric configuration
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 significantly increases the liquid storage capacity and stability of the fibers, maintaining or improving properties for absorbent applications while reducing density, leading to improved absorbency and processing ease.
Implementation Method 1
spinning the viscose spinning mass through at least one opening of a spinneret into a spinning bath, whereby filaments are formed
Implementation Method 2
the cross-section is formed of at least two multi-limbed basic shapes, which basic shapes are connected, in each case at least at one of their limb ends, to the limb end of another basic shape and the length of the connecting limb resulting from the connection of the two limb ends is longer than the length of the shortest one of the other limbs by a factor of at least 1.5
Data Source
AI summary
The present invention relates to a regenerated cellulose fiber having a multi-limbed cross-section. The fiber according to the invention is characterized in that the cross-section is formed of at least two multi-limbed basic shapes (1′, 2′, 3′, 4′), which basic shapes are connected, in each case at least at one of their limb ends, to the limb end of another basic shape and the length of the connecting limb (12) resulting from the connection of the two limb ends is longer than the length of the shortest one of the other limbs by a factor of at least 1.5, preferably of from 1.5 to 2.0.