Textile using a flat multilobar cross-section fiber
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Solution Overview
Problem
Existing fabrics for sportswear and outdoor wear lack sufficient glossiness and durability, particularly after repeated washing, and exhibit increased air permeability leading to downs slipping out of jackets.
Innovation Solution
A lightweight, thin fabric with high strength and low air permeability is achieved using polyamide fibers with a flat multifoliar cross-section and specific calender processing, resulting in a fabric with a flat ratio of 1.5 to 3.0 and 6 to 10 lobe parts, which maintains low air permeability and excellent glossiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a polyester multifilament or nylon multifilament fabric is used to achieve lightweight and thin properties, then weight and thickness are reduced, but glossiness is insufficient and appearance is unsatisfactory
Solution Approach 1:
The invention changes the physical parameters of the fiber by using a flat multifoliar cross-section shape with 6 to 10 lobe parts and controlling the flat ratio, which fundamentally alters how light interacts with the fabric surface to produce delicate glossiness while maintaining lightweight properties
Solution Approach 2:
The calender processing creates a uniformly pressed surface where light is reflected evenly across the fabric, eliminating the glitter and streaks that occur with conventional multifilament fabrics, thus achieving consistent glossiness throughout the material
2Weight of moving object
If conventional multifilament fabric is used to achieve lightweight properties, then weight is reduced, but air permeability increases significantly after repeated washing
Solution Approach 1:
The flat multifoliar cross-section shape is built into the fiber structure before fabric formation, creating inherent interlocking capability between adjacent fibers that prevents gap formation during washing, thus preliminarily establishing air permeability stability
Solution Approach 2:
The invention uses a composite structure where multiple filaments with flat multifoliar cross-sections are twisted together, creating a fabric where the interlocking lobes of adjacent filaments form a stable network that resists opening during washing cycles
3Strength
If calender processing is applied to achieve high strength by pressing monofilaments overlapped, then tear strength is improved, but glossiness becomes unsatisfactory with glitter and streaks
Solution Approach 1:
The invention applies local quality by using flat multifoliar cross-section shapes with multiple lobe parts that create different light reflection characteristics in different regions of the fiber, producing a nuanced glossiness that avoids uniform glitter while maintaining strength through the pressed structure
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 fabric provides a high-quality, durable, and aesthetically pleasing solution for sportswear and outdoor wear, ensuring low air permeability and preventing downs from slipping out even after multiple washes.
Implementation Method 1
by subjecting the fabric to calender processing on at least one surface, monofilaments are pressed overlapped each other
Implementation Method 2
the single filament having a cross-sectional shape that is flat multifoliar with 6 to 10 lobe parts... excellent glossiness
Data Source
Figure 1~2
Figure 3(a)~3(b)
Figure 3(c)~4(a)
AI summary
The present invention provides a fabric that is lightweight and thin and has high strength, low air permeability, and excellent glossiness, a sewn product, and a down shell and a down jacket. More particularly, the present invention provides a fabric that can be suitably used for a ticking of, for example, sportswear, casual wear, and women's and men's wear represented, for example, by down jackets, windbreakers, golf wear, and rainwear; a sewn product obtained by using the fabric at least in part; and a down shell and a down jacket obtained by using the fabric at least in part. The fabric of the present invention is a fabric subjected to calender processing on one or both surfaces, comprising a polyamide fiber as warp or/and woof having, after calender processing, a single filament fineness of 0.5 to 2.5 dtex and a total fiber fineness of 5 to 50 dtex, the single filament having a cross-sectional shape that is flat multifoliar with 6 to 10 lobe parts and has a flat ratio (W) (α/β) of 1.5 to 3.0, the fabric having a cover factor of 1200 to 2500.