1. The Development of “DELTA®”, A Well-balanced Knit Material
Teijin Fiber Co., Ltd. Process Engineering

2. 1. Backgrounds to the Development
Changes in the sports wear market ↓
Demand for a material with a high level of
“texture”, “physical property”, and “functionality”
Development of Well-balanced Knit Material “Delta®”
スポーツ衣料市場の環境変化 ↓
｢質感｣・｢物性｣・｢機能性｣ の全ての面において
高いレベルの商品が要求されている
高バランスニット素材｢デルタ｣の開発
Well-balanced Knit Material “DELTA®”
“Physical Property”
School/Baseball Uniforms
Athletics
Casual Knit
“Texture”
“Functionality”

3. 3. Outlines of DELTA® Technology
(1) Problems in current products --- ” ill-balanced knit ”
Many current products use polyester false-twist yarns ↓
Loops become distorted because of “twisting” of false-twist yarns
Surface
現状は、ﾎﾟﾘｴｽﾃﾙ仮撚糸を使用している商品が多い ↓
仮撚糸が持っている“ねじれ”特性によってループに‘ひずみ’が生じる
Section
Loops lacking roundness
Large gaps between loops
Distorted loops
Rough surface
(not flat)

4. Remove distortions in the loops (Balancing the knit fabric)
(3) Roundness of loops
Round
Flattened
Surface
Section
DELTA®
Conventional materials
(2) Gaps between loops
Large
Small
(4) Loop distortion
Distorted
No distortion
(1) Surface
Flat
Rough

5. Conventional Products
DELTA®
Conventional Products
Surface Appearance
Bulkiness
Weight ｇ/㎡
138
135
Thickness mm
0.71
0.60

6. 2. Product Features of DELTA®
(1) Physical Properties
1) Anti-snagging property
[1] What is snagging?
A defect that is made when the material is caught by a sharp projection
[2] How it happens?
Typical snagging
<1st stage>
<2nd stage>
<3rd stage>

7. Items Conventional Technologies DELTA®
[3] Comparisons between Conventional Technologies and DELTA®
Items
Conventional Technologies
DELTA®
(1) Minimizing the length of exposed yarn
(2) Reduction of gaps between loops
(3) Increasing the binding force of knit fabric a a’
Minimum length of exposition
Twisted yarn, air twined yarn
Minimum gaps between loops
Increase the density of knit fabric
The ultimate flatness of the surface maintains superior physical properties with low binding force.
Bond the surface with resin

8. Anti-snagging property improved while maintaining
[4] Comparisons by Measurement
* Measurement Method: JIS L1076 Snagging D3 (Metal saw method)
DELTA®
Conventional Material
15 hours
30 hours
Class 4-5
Class 3
Class 4
Class 2-3
Anti-snagging property improved while maintaining
other properties of knit material

9. 2) Runproof [1] The mechanism of running [2] Data on actual running
A loop is pulled out by a force applied to this part 45 １0 20 30 40 50
Length of running 10
(mm)
DELTA®
Conventional material
(Teijin test method)
To prevent this, increase the frictional coefficient between loops
　　　　　　　　　　　　↓
Yarns forming rounded loops are effective
Round loops

10. Since DELTA® is free of distorted loops, loops deform smoothly. ↓
(2) Functionalities
1) Stretching
[1] Comparison of stretching mechanism
 the stretching property of knit material is provided by deformation of loops
DELTA®
Conventional Material
The image of loop deformation
Round loops
Distorted loops
Since DELTA® is free of distorted loops, loops deform smoothly. ↓
Easily stretchable to offer better comfort

11. Expansion (%) [2] A Comparison of Stretching Characteristics
Stretching Stress
(lengthwise)
Expansion (%)
DELTA®
Conventional material
Lengthwise:
42%
Crosswise:
125%
25%
110%
Low stretching stress (especially lengthwise) ↓
Superb stretching property for comfortable and soft clothing
Excellent stretching property in both directions
◆Sample knit fabric: 28G mesh, 54 courses/44 wales タテ
Conventional material
Load
(kg)
DELTA® θ θ
Expansion (%)

12. Technological Summary
Classifications
Product Features
Technological Summary
Tex-ture
Appear-ance
- Classy appearance without glossiness and with dense texture and flat surface
1. Development of a special false-twist yarn
　　　　　　　　　↓
　　　　　Low contortion
2. Optimization of knitting conditions
 optimization of knitting structure, knitting conditions, and mixing other yarn
3. Development of special dyeing technique
(1) Low tension processing
(2) Maximization of beating effect
Feel
- Soft and bulky
Physical Properties
- Anti-snagging
- Runproof
- Excellent structural stability
Functionalities
- Smooth stretching
- UV cut
- Non-transparency
Others
It is possible to make special structures (Aqua Dry, Wind Barrier, etc.) with special yarns (Waveron, Pasmo, Eco-circle fiber, etc.) to develop a product for any situation.
* One patent