Hemp-Blended Yarn Cohesion via Latent Crimped Fiber
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Solution Overview
Problem
Hemp fibers are difficult to spin due to their high rigidity, non-stretchability, and lack of crimp, resulting in low wearing comfort and mobility in final products.
Innovation Solution
A method of producing hemp-blended single spun yarn by blending hemp fibers with latent and potential crimped yarn fibers, using a carding and drafting process to create a sliver, and then twisting a combined filament yarn with a low-stretchability core surrounded by high-stretchability yarn to enhance cohesion and reduce mowing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hemp fiber is spun alone, then the yarn has high durability and excellent functional properties, but the spinning process is extremely difficult due to high rigidity and lack of cohesion
Solution Approach 1:
The patent applies composite materials by blending hemp fiber with synthetic fiber (polyester or polyamide) in a specific ratio (60:40 to 40:60). The synthetic fiber components provide the necessary cohesion and flexibility that pure hemp lacks, enabling successful spinning while maintaining hemp's durability and functional properties in the final yarn product.
2Reliability
If hemp fiber is used in high proportion, then the yarn maintains excellent sweat-absorbing ability and air permeability, but the yarn becomes rough and stiff with excessive wrinkles
Solution Approach 1:
The patent applies parameter changes by controlling the blending ratio of hemp to synthetic fiber within specific ranges (60:40 to 40:60). By adjusting this parameter, the yarn achieves optimal balance between maintaining hemp's sweat-absorbing ability and air permeability while incorporating enough synthetic fiber to provide flexibility, reduce roughness, and minimize wrinkles for improved wearing comfort.
3Ease of manufacture
If hemp fiber is blended with small amount of other fiber, then the spinning processability is improved, but the cohesion of hemp fiber remains insufficient
Solution Approach 1:
The patent applies parameter changes by establishing a specific blending ratio range (60:40 to 40:60 of hemp to synthetic fiber). This parameter optimization ensures that enough synthetic fiber is present to provide adequate cohesion and spinning processability, while maintaining sufficient hemp content to preserve the desired functional properties.
4Strength
If hemp fiber is spun with high twist, then the yarn strength is improved, but the inherent stiffness and mowing problems are exacerbated
Solution Approach 1:
The patent applies composite materials by combining hemp fiber with flexible synthetic fiber (polyester or polyamide). The synthetic fiber components act as a flexible matrix that binds the hemp fibers, providing yarn strength through the composite structure rather than relying solely on high twist. This composite approach maintains mobility and reduces stiffness while achieving the required strength.
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 increases spinning efficiency, improves wearing comfort and mobility, and minimizes mowing issues in hemp-based products by creating a yarn with enhanced cohesion and stretchability.
Implementation Method 1
passing hemp fiber, together with latent and potential crimped yarn fiber, through an opener in order to increase the cohesion of the hemp fiber by the three-dimensional chain structure of the latent and potential crimped yarn fiber
Implementation Method 2
carding the blended fiber through a carding machine
Implementation Method 3
drafting the carded fiber through a drafting machine, thereby producing a sliver
Implementation Method 4
supplying the sliver as a roving yarn through a plurality of rollers to a twisting unit
Implementation Method 5
supplying a combined filament yarn, produced by twisting and having a structure in which a low-stretchability filament yarn surrounds a high-stretchability filament yarn, as a core yarn to the twisting unit
Data Source
AI summary
A method of producing a hemp-blended single spun yarn may include: a fiber blending step of passing hemp fiber, together with latent crimped yarn fiber, through an opener in order to increase the cohesion of the hemp fiber by the three-dimensional chain structure, thereby producing a blended fiber including 10% to 60% latent crimped yarn fiber; a sliver production step of carding the blended fiber through a carding machine, and drafting the carded fiber through a drafting machine, thereby producing a sliver; and a spinning step of supplying the sliver as a roving yarn through a plurality of rollers to a twisting unit, and supplying a combined filament yarn, produced by twisting and having a structure in which a low-stretchability filament yarn surrounds a high-stretchability filament yarn, as a core yarn to the twisting unit without being passed through the plurality of rollers.