Solvent-Spun Cellulosic Fiber Blends for Reduced Fibrillation
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Solution Overview
Problem
Blends of high wet modulus cellulosic fibers and solvent-spun cellulosic fibers face issues such as fibrillation, poor pilling performance, uneven dyeability, and decreased properties in knit applications, particularly during wet processing steps like dyeing, leading to creasing and friction marks, and increased dye uptake, which hinder market success.
Innovation Solution
A blend of high wet modulus cellulosic fibers with non-fibrillating solvent-spun cellulosic fibers having an NSF value of more than 200, cross-linked with alkali-resistant agents, which maintains high tenacity and abrasion resistance while improving pilling performance and dyeability, especially when mixed with cotton or synthetic fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If solvent-spun cellulosic fibers are added to high wet modulus cellulosic fibers to improve yarn tenacity and reduce wash shrinking, then fiber blend tenacity improves, but fibrillation occurs during wet processing leading to creasing and friction marks
Solution Approach 1:
The harmful fibrillation property is extracted from the solvent-spun cellulosic fibers through selective removal or modification of the fibrillating components, allowing the beneficial tenacity to be retained while eliminating the adverse surface friction and creasing effects
Solution Approach 2:
The surface properties of solvent-spun cellulosic fibers are modified by changing physical or chemical parameters such as surface smoothness, fiber diameter distribution, or chemical composition to reduce fibrillation tendency while maintaining high tenacity characteristics
2Ease of operation
If solvent-spun cellulosic fibers are blended with high wet modulus cellulosic fibers to enhance wear comfort, then humidity management improves, but pilling performance deteriorates in knit applications
Solution Approach 1:
A composite fiber structure is created by combining solvent-spun cellulosic fibers with high wet modulus cellulosic fibers in a controlled manner, where the composite maintains the humidity management benefits while the high wet modulus component provides structural stability to prevent pilling
Solution Approach 2:
Different regions of the fabric or different fiber components are given different properties: the solvent-spun fibers provide humidity management in specific zones while the high wet modulus fibers provide anti-pilling structural support in load-bearing areas
3Ease of manufacture
If solvent-spun cellulosic fibers are added to improve fabric properties, then dyeability should improve, but uneven dye uptake and increased dye consumption occur
Solution Approach 1:
The chemical parameters of solvent-spun cellulosic fibers are adjusted to match the dye affinity and uptake characteristics of high wet modulus cellulosic fibers, ensuring uniform dye distribution and reducing overall dye consumption while maintaining ease of manufacture
4Ease of operation
If knit products are made from blends of high wet modulus and solvent-spun cellulosic fibers, then fabric softness improves, but severe creasing and friction marks appear during wet processing
Solution Approach 1:
The fibrillation-causing surface characteristics are extracted or removed from the solvent-spun cellulosic fibers through physical or chemical treatment, allowing the fibers to maintain softness while eliminating the creasing and friction mark formation during wet processing of knit products
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 blend exhibits improved pilling performance, even dyeing results, and enhanced wear comfort, maintaining high tenacity and abrasion resistance, suitable for lightweight, easy-care clothing, and reduces fibrillation and wash shrinkage, making it suitable for summer or tropical clothing.
Implementation Method 1
cross-linked with alkali-resistant agents
Data Source
Figure 1
AI summary
The invention relates to blends of high wet modulus cellulosic fibres and crosslinked solvent spun cellulosic fibres and yarns and fabrics made thereof.