Elasticized Linen Yarn Winding for Surface Regularity
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Solution Overview
Problem
Elastic thread yarns made from stiff and relatively inelastic natural fibers like linen, ramié, and hemp often exhibit the 'orange skin' effect, characterized by surface irregularities and roughness, which compromises comfort and appearance compared to fabrics made from cotton or synthetic fibers.
Innovation Solution
The development of an elastic thread yarn with a specific winding pattern, where the number of windings per length unit is calculated using the equation T=K(1000 Nm)α, with K between 20 and 50 and α between 0.30 and 0.35, to ensure the windings remain close and regular, preventing interlacing and maintaining elastic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If linen, ramié, or hemp yarn is used as covering yarn in elastic thread yarns, then the fabric has natural fiber properties, but the fabric surface develops irregularities and roughness known as the 'orange skin' effect
Solution Approach 1:
The patent applies parameter changes by precisely controlling the winding parameters (number of windings per unit length, winding tension, and winding speed) to prevent the interlacing of natural fiber yarns. The specific parameter range for windings per meter is optimized to maintain surface regularity while using linen, ramié, or hemp covering yarns, thereby eliminating the orange skin effect and preserving natural fiber benefits.
2Manufacturing precision
If the number of windings per length unit is increased to prevent interlacing and maintain surface regularity, then the surface quality improves, but the elasticity of the yarn may be compromised
Solution Approach 1:
The patent identifies and controls critical parameters including the number of windings per unit length, winding tension, and winding speed. By optimizing these parameters within specific ranges, the invention achieves surface regularity without excessive winding density that would compromise elasticity. The elastic thread core composition is also adjusted to maintain elastic properties despite increased winding constraints.
Solution Approach 2:
The patent uses a composite structure with an elastic thread core (made of elastomeric materials) and a natural fiber covering yarn (linen, ramié, or hemp). This composite design allows the elastic core to provide the necessary elasticity while the covering yarn provides natural fiber properties, provided the winding parameters are controlled to prevent interlacing and maintain surface regularity.
3Ease of manufacture
If conventional winding methods are used to create elastic thread yarns, then production is simpler, but surface irregularities and the 'orange skin' effect occur
Solution Approach 1:
The patent maintains ease of manufacture by using conventional winding machinery and processes, but introduces precise control of winding parameters (number of windings per meter, winding tension, and speed ratios) to prevent surface irregularities. This approach achieves high surface regularity without requiring complex new equipment or multi-step processes, balancing simplicity with precision.
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 results in elastic fabrics that are smoother, free from the 'orange skin' effect, and retain comparable elasticity to fabrics made from other fibers, while being easy and cost-effective to produce.
Implementation Method 1
A determined stretch of the so-obtained elasticized product causes a progressive reversible elongation of the helix along the elastomeric core, in such a way that the windings move away from one another. When the stretch is released, the windings of the helix substantially revert to the starting conformation
Data Source
AI summary
An elastic thread yarn comprising linen and/or ramié and/or hemp and an elastic thread, with a thread made of an elastomeric material, and a substantially inextensible yarn made of linen and/or ramié and/or hemp helically wound about the elastomeric core at a predetermined number of windings per length unit of elasticized yarn, wherein, for each metric count Nm, the number of windings substantially inextensible yarn of the elasticized yarn, is set between two values indicated by two curves (12, 13) which can be expressed according to exponential laws, for example, with the same exponent, i.e. according to equations of the form T=K N0, 327 where K is 20 and 50, respectively. In particular, an intermediate curve 11 is such that, by choosing for a given metric count a number of windings proximate to curve 11, this best feature balance is obtained. In an exemplary embodiment, the core comprises a bare elastic thread, i.e. an elastic thread that is not coated by other fibers. In another exemplary embodiment, the core comprises an elastic thread coated with a natural fiber as cotton or viscose, or with a combination thereof. The elastic thread yarn according to the invention provides elasticized fabrics containing linen and/or on ramié, which has, in particular, a better surface regularity than well-known elasticized fabrics comprising linen, and which is comparable with the regularity of the elasticized fabrics comprising natural fibers such as cotton, wool, etc. and synthetic fibers, and also allows using ramie and hemp yarns to make elastic thread yarns and fabrics, for example, for making cloth items.