scholarly journals Determination of Knitted Fabric Porosity Using Digital Imaging Techniques

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Manoj Kumar Imrith ◽  
Roshan Unmar ◽  
Satyadev Rosunee
Keyword(s):  
Computer Program ◽  
Digital Imaging ◽  
Imaging Techniques ◽  
Air Permeability ◽  
Knitted Fabric ◽  
Regression Equations ◽  
High Porosity ◽  
Knitted Fabrics ◽  
Geometrical Modeling

This paper has investigated the porosity of knitted fabrics using digital imaging techniques. A number of different methods have been proposed to determine the porosity of knitted fabrics, which include digital imaging, geometrical modeling, and air permeability. Digital imaging is an adequate technique to determine the porosity of high-porosity fabrics. In this work, eight types of knitted structures with eight different stitch lengths were produced on a flat-bed knitting machine. Porosity was determined using digital imaging techniques based on the method of threshold and pixel count, using a computer program developed for this work. The study consisted also of validating the results by including the data from two tested samples—from each set of knits throughout the use of regression equations which demonstrated that there is good correlation between the black mask and white mask images.

Research on Air Permeability, Moisture Permeability and UV Protection of Polyester Linen Blended Knitted Fabric

2013 ◽  
Vol 821-822 ◽  
pp. 411-414
Author(s):  
Yu Xiu Yan ◽  
Yan Na Feng ◽  
Xiu Yin Wang ◽  
Jing Jin ◽  
Jian Wei Tao
Keyword(s):  
Air Permeability ◽  
Uv Protection ◽  
Knitted Fabric ◽  
Regression Equations ◽  
Knitted Fabrics ◽  
Moisture Permeability ◽  
Fabric Structures

Most of UV protection textiles are made of chemical fibers, and a large part of them have poor air permeability and moisture permeability, which influences the wearing comfort. This work blended polyester and linen to produce a new kind of knitted fabric and tested the fabric structures, air permeability, moisture permeability and UV value. Excel and SPSS were used to compare the properties of new knitted fabrics and find out the relationships between the constructional parameters and properties. The results indicated that there are regression equations between constructional parameters and properties and got a new kind of UV protection fabric with good air permeability and moisture permeability.

Optimization of Knitted Fabric Comfort and UV Protection using Desirability Function

2016 ◽  
Vol 11 (4) ◽  
pp. 155892501601100 ◽  
Author(s):  
Anindya Ghosh ◽  
Prithwiraj Mal ◽  
Abhijit Majumdar ◽  
Debmalya Banerjee
Keyword(s):  
Thermal Conductivity ◽  
Desirability Function ◽  
Air Permeability ◽  
Quality Parameters ◽  
Uv Protection ◽  
Knitted Fabric ◽  
Uv Resistance ◽  
Knitted Fabrics ◽  
Target Values ◽  
Fabric Comfort

The present study deals with the optimization of multiple quality parameters of single jersey and 1×1 rib knitted fabrics using the desirability function approach. Comfort properties such as air permeability, thermal conductivity and safety properties such as UV protection are combined to yield an ‘overall desirability’ varying from zero to one. The overall desirability has been maximized versus target values for air permeability, thermal conductivity and UV resistance. Experimental validation confirms that the proposed method can be used to design a knitted fabric with desired comfort and UV resistance characteristics.

Analysis of physical properties and structure design of weft-knitted spacer fabric with high porosity

2016 ◽  
Vol 88 (1) ◽  
pp. 59-68 ◽  
Author(s):  
Chaoyu Chen ◽  
Zhaoqun Du ◽  
Weidong Yu ◽  
Tilak Dias
Keyword(s):  
Three Dimensional ◽  
Middle Layer ◽  
Air Permeability ◽  
Structure Design ◽  
Experimental Results ◽  
Knitted Fabric ◽  
High Porosity ◽  
Compression Properties ◽  
Plain Knitted Fabric ◽  
Spacer Fabric

The main content dealt with in the paper is to present a kind of weft-knitted spacer fabric with high porosity. It is a kind of three-dimensional textile fabric with a sandwich structure that consists of a middle layer of multifilament and two outer layers of plain-knitted fabric. Compared with traditional warp-knitted spacer fabric as cushion mats, weft-knitted spacer fabric is well used as apparel for good softness, thermal/moisture comfort, and air permeability. Therefore, three structures were designed and nine samples were prepared by choosing plain-knitted fabric as the outer layers and selecting soft and thin multifilament as a middle layer. Experimental results show that this kind of weft-knitted spacer fabrics has high porosity, greater than 86%, and also demonstrate that the weft-knitted spacer fabric is suitable for comfortable apparel based on experimental results of air permeability, compression properties, stiffness, and thermal insulation properties.

Pilot Study of PET/Bamboo Charcoal Warp-Knitted Fabric

2012 ◽  
Vol 184-185 ◽  
pp. 1090-1093 ◽  
Author(s):  
Jia Horng Lin ◽  
Ching Wen Lin ◽  
Chin Mei Lin ◽  
Yi Chang Yang ◽  
Ting Ting Li ◽  
...  
Keyword(s):  
Far Infrared ◽  
Air Permeability ◽  
Weft Yarn ◽  
Knitted Fabric ◽  
Bamboo Charcoal ◽  
Health It ◽  
Warp Yarn ◽  
Knitted Fabrics ◽  
Far Infrared Ray ◽  
Warp Knitted Fabric

In recent years, as improvement of human living life, people begin to focus on themselves health. It is certain that bamboo charcoal has many properties, including water purification, deodorization, anion release and far-infrared ray radiation. This study aims to prepare PET/BC warp-knitted fabric composed of polyester yarn (PET) as warp yarn and bamboo charcoal polyamine yarn (BC) as weft yarn using Velcro Crochet Machine. Afterwards, air permeability, elastic resilience and far-infrared ray emissivity of resulting knitted fabric were discussed by changing weft yarn type. Result shows that, for knitted fabrics, weft yarn type cannot affect the elastic resilience; yet PET weft yarn makes air permeability decreasing.

scholarly journals The Effect of Number and Position of Tuck Stitches within the Pattern Repeat on Air Permeability of Weft-knitted Fabrics from Glass Yarn

2019 ◽  
Vol 2 (3) ◽  
pp. 317-323
Author(s):  
Mehmet Erdem İnce
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Physical And Mechanical Properties ◽  
Air Permeability ◽  
Knitted Fabric ◽  
Knitted Fabrics ◽  
Synthetic Fibers ◽  
Fabric Structure ◽  
Knit Fabrics ◽  
Weft Knitted Fabric

The fact that weft knitted fabrics has a stretchable, 3D, porous and interlocking structure makes them unique when manufactured from high performance fibers. Knitted fabrics with different architectures exhibit different properties. Different loop forms like tuck and skip stitches with various loop lengths reveal different physical and mechanical properties. Literature review indicated that wisely arrangement of tuck stitches within the pattern repeat alter the weft-knitted fabric structure from natural and synthetic fibers. Therefore, we studied the effect of number and location of tuck stiches on air permeability of weft-knitted fabrics from glass yarn. Single-bed, flat weft knitting machine was used to knit fabrics with different architectures from three-ply glass yarn. The nominal single-end count of used E-glass yarn was 136 tex. It is anticipated that the number and location of tuck stitches within knit pattern effect physical and air permeability properties of weft-knitted fabrics from glass yarn.

scholarly journals Porosity of Knitted Fabrics in the Aspect of Air Permeability - Discussion of Selected Assumptions

2017 ◽  
Vol 25 (0) ◽  
pp. 86-91 ◽  
Author(s):  
Marie Havlová ◽  
Jana Špánková
Keyword(s):  
Theoretical Calculations ◽  
Correlation Coefficients ◽  
Air Permeability ◽  
Knitted Fabrics ◽  
Textile Materials ◽  
Yarn Hairiness ◽  
The Relationship ◽  
Very High ◽  
Single Jersey

The main focus of this paper is to look into the relationship between the structure and air permeability of single jersey knitted fabric – especially verifying some basic assumptions. First, if it is possible to neglect the permeability of yarns themselves when we evaluate that of knits, and second, if yarn hairiness plays a significant role when we evaluate the relationship between air permeability and the porosity of knits. Theoretical calculations and experiments which were performed using an analysis of microscopic images of the structure of textile materials are used for the determination of inter-yarn and intra-yarn porosity. The paper aims to show t hat the characteristic dimension of inter-yarn pores is significantly higher than that of intra-yarn pores, and also that the values of inter-yarn porosity measured using image analysis methods with hairiness and after the removal of hairiness are statistically significantly different. The correlation coefficients for the porosity values measured and calculated are very high.

Thermo-physiological and sensorial comfort properties of polyester and Coolmax knitted fabrics

2021 ◽  
Vol 64 (2) ◽  
pp. 63-65
Author(s):  
Ganesh S. Kakad ◽  
Ramchandra P. Sawant
Keyword(s):  
Water Vapor ◽  
Transmission Rate ◽  
Air Permeability ◽  
Knitted Fabric ◽  
Water Vapor Transmission Rate ◽  
Knitted Fabrics ◽  
Water Vapor Transmission ◽  
Fabric Material

This paper deals with thermo-physiological and sensorial comfort properties of knitted fabric samples manufactured from standard polyester (PET) and Coolmax (multi-lobal PET fiber) yarn by The Lycra Company, Wilmington, DE/USA. 18 knitted fabric samples were prepared by using PET and Coolmax. These samples were tested for qmax property related to warm/cool feeling, water-vapor transmission rate and air permeability. The results were analyzed statistically, and it was shown that fabric material used yarn to manufacture knitted samples, i.e. PET and Coolmax, has a significant effect on qmax, water-vapor transmission rate and air permeability of knitted fabric samples used in this study.

scholarly journals An Investigation On Air and Thermal Transmission Through Knitted Fabric Structures Using the Taguchi Method

2017 ◽  
Vol 17 (2) ◽  
pp. 152-163 ◽  
Author(s):  
Anindya Ghosh ◽  
Prithwiraj Mal ◽  
Abhijit Majumdar ◽  
Debamalya Banerjee
Keyword(s):  
Air Permeability ◽  
Raw Material ◽  
Knitted Fabric ◽  
Loop Length ◽  
Knitted Fabrics ◽  
Yarn Count ◽  
Fabric Structures ◽  
Noise Factors ◽  
Single Jersey ◽  
Thermal Absorptivity

Abstract Knitted fabrics have excellent comfort properties because of their typical porous structure. Different comfort properties of knitted fabrics such as air permeability, thermal absorptivity, and thermal conductivity depend on the properties of raw material and knitting parameters. In this paper, an investigation was done to observe the effect of yarn count, loop length, knitting speed, and yarn input tension in the presence of two uncontrollable noise factors on selected comfort properties of single jersey and 1×1 rib knitted fabrics using the Taguchi experimental design. The results show that yarn count and loop length have significant influence on the thermo-physiological comfort properties of knitted fabrics.

scholarly journals Air Permeability, Shock Absorption Ability, and Flexural Strength of 3D-Printed Perforated ABS Polymer Sheets with 3D-Knitted Fabric Cushioning for Sports Face Guard Applications

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1879
Author(s):  
Thet Khaing Aung ◽  
Hiroshi Churei ◽  
Gen Tanabe ◽  
Rio Kinjo ◽  
Kaito Togawa ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Acrylonitrile Butadiene Styrene ◽  
Air Permeability ◽  
Return To Play ◽  
Knitted Fabric ◽  
Shock Absorption ◽  
Knitted Fabrics ◽  
Honeycomb Structures ◽  
Polymer Sheets ◽  
3D Printed

Sports face guards (FGs) are devices that protect athletes from maxillofacial injury or ensure rapid return to play following orofacial damage. Conventional FGs are uncomfortable to wear owing to stuffiness caused by poor ventilation and often slip off due to increase in weight due to absorption of moisture from perspiration, lowering players’ performance. Herein, combinations of 3D-printed perforated acrylonitrile butadiene styrene (ABS) polymer sheets and 3D-knitted fabrics with honeycomb structures as cushioning materials were investigated to balance better wearing feel and mechanical properties. The flexural strength, weight, and shock absorption ability of, and air flow rate through, the ABS sheets with five different perforation patterns were evaluated and compared with those of conventional FG materials comprising a combination of polycaprolactone sheets for the medical splint and polychloroprene rubber for the cushioning material. The ABS sheets having 10% open area and 2.52 mm round holes, combined with knitted fabric cushioning, exhibited the requisite shock absorbing, higher air permeability, and lower weight properties than the conventional materials. Our results suggest that FGs fabricated using combinations of 3D-printed perforated ABS polymer sheets and 3D-knitted fabrics with honeycomb structures may impart enhanced wearing comfort for athletes.

Development of multi-layered weft-knitted fabrics for thermal insulation

2019 ◽  
pp. 152808371987881
Author(s):  
Vaida Buzaite ◽  
Reazuddin MD Repon ◽  
Daiva Milasiene ◽  
Daiva Mikucioniene
Keyword(s):  
Heat Transfer ◽  
Heat Exchange ◽  
Thermal Insulation ◽  
Raw Materials ◽  
Air Permeability ◽  
Knitted Fabric ◽  
Heated Plate ◽  
Knitted Fabrics ◽  
Knitted Structure ◽  
The One

The main goal of the presented study was to develop new multi-layered weft-knitted structure for thermal insulation and to investigate the dynamic of the heat transfer through this fabric. For knitting of outer and inner layers of this structure, different raw materials of yarns were used, i.e. wool, cotton, polyester and acrylic yarns. All the newly developed multi-layered weft-knitted fabrics show thermal insulation as, after 1 h of observation, temperature on the outer layer of all tested fabrics does not reach 40℃, i.e. the temperature of a heated plate. The results of this research showed that the nature of the yarns has a significant influence on the air permeability and dynamic of the heat exchange through the multi-layered structure, as it influences porosity of the knitted fabric. The results showed that the best fabric was the one where the outer layers are knitted from woollen yarns and the inner layer from polyester filament yarns.

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