Theory of structure and mechanics of fibrous assemblies

Neckář, Bohuslav; Das, Dipayan

doi:10.1533/9780857093028

Cited by 28 publications

(19 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Porosity of the knitted fabric is formulated by volume fraction µ, which is the ratio of bre material volume V to the unit cell cube volume V c [13]. In the case of the knitted fabric, Vc can be de ned as a cuboid of dimensions: a x b x T (Figure 8) where a is course spacing, b is wale spacing, T 0 is thickness of the fabric.…”

Section: Evaluation Of Fabric Porosity By Mathematical Modelmentioning

confidence: 99%

Application of Microtomography in Textile Metrology

Doczyova¹,

Glombikova²,

Komarkova³

2014

TEK

View full text Add to dashboard Cite

Porosity represents one of the parameters of knitted fabrics, which signifi cantly aff ects their air permeabi lity and thus the overall physiological comfort of knitted clothes. X-ray computed microtomography (µCT) is a relatively new but not yet widely used method for studying textile porosity. The paper discusses the use of a 3D image of the textile structure obtained by applying μCT in the textile metrology. Specifi cally, it deals with the analysis of options for determining the 3D porosity of knitted fabric by μCT and subsequent analysis of the relationship of porosity versus the fabric permeability to air. The fi rst part of the article was aimed to analyse the suitability of application of µCT to determine the 3D porosity of textile materials and determination of appropriate measurement conditions. Obtained porosity data measured by the 3D device SkyScan 1174 was compared to the porosity calculated by the standard mathematical model. The research results show that μCT system is suitable alternative method for 3D porosity measurement. There is very small diff erence (about 6%) between the percentage of the air volume of the examined knitted fabric obtained by µCT (64.6%) and porosity expressed through the volume fraction by standard mathematical model (70.6%). The last part analyses the dependent relationship between porosity of the knitted structures obtained by using μCT SkyScan 1174 and air permeability measured on FX device 3300 according to EN ISO 9237. Analysis between air permeability and measured porosity of others knitted structures verifi ed correctness of suggested measurement process of 3D porosity.

show abstract

Section: Evaluation Of Fabric Porosity By Mathematical Modelmentioning

confidence: 99%

Application of Microtomography in Textile Metrology

Doczyova¹,

Glombikova²,

Komarkova³

2014

TEK

View full text Add to dashboard Cite

show abstract

“…The settings of the ring spinning machine are selected to reduce the hairiness of the yarn and the risk of the fiber vitrifying or melting. Koechlin's equation is a basic equation which assumes that the yarn is a linear formation in the form of a cylinder [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…According to Koechlin, the yarn twist is a product of the twist multiplier and the square root of the yarn count, expressed in an indirect system of yarn count. This expression was very simple, but, unfortunately, did not provide sufficiently accurate results [2][3][4][5]. Later, many researchers corrected Koechlin's expression empirically [2].…”

Section: Introductionmentioning

confidence: 99%

“…This expression was very simple, but, unfortunately, did not provide sufficiently accurate results [2][3][4][5]. Later, many researchers corrected Koechlin's expression empirically [2]. However, there is still hardly any theoretical expression for determining yarn twist.…”

Section: Introductionmentioning

confidence: 99%

“…This is very interesting because all authors recommend twist exponents greater than 0.5, usually by 0.66 (q = 2/3). The twist exponent mentioned above is also recommended by Mr. Laetsch [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Determination of Optimum Twist Equation for the Long Staple Combed Cotton Ring-Spun Yarn

Gorjanc

Sukič

2020

Fibers

View full text Add to dashboard Cite

The aim of this research was to determine the optimum twist equation for ring-spun yarns. The yarn twist can be calculated by different equations. With the research, we tried to find the appropriate equation to determine the yarn twist, which is determined by the values of yarn strength and hairiness. In the research, yarns from long staple combed cotton rovings and of different fineness (10 tex, 11.8 tex, 20 tex and 29.4 tex) were analyzed. The yarn twist was calculated using the equations of Koechlin and Laetsch. The analyzed yarns were produced in the spinning mill on the laboratory ring spinning machine Spinntester. In the second part of the investigation, yarn strength and hairiness were analyzed as a function of yarn twist. The results showed that Laetsch’s equation is suitable for determining the twist for yarns with a fineness of 10 tex, 11.8 tex, 20 tex and 29.4 tex, since, in this case, the calculated number of yarn threads is higher and thus the strength and elongation at break are also higher. The yarn hairiness is higher in analyzed samples for yarns with the twist calculated according to the Koechlin’s equation.

show abstract

Fundamental Aspects of Textile Fibres

2015

Physico‐chemical Aspects of Textile Coloration

View full text Add to dashboard Cite

Theory of structure and mechanics of fibrous assemblies

Cited by 28 publications

References 0 publications

Application of Microtomography in Textile Metrology

Application of Microtomography in Textile Metrology

Determination of Optimum Twist Equation for the Long Staple Combed Cotton Ring-Spun Yarn

Fundamental Aspects of Textile Fibres

Contact Info

Product

Resources

About