CN102183625A - Method for characterizing and measuring bulkiness property of universally applicable spinning yarn - Google Patents

Abstract

The invention relates to a method for characterizing and measuring bulkiness property of a universally applicable spinning yarn. The method comprises the following steps: determining a yarn density and an apparent diameter of the yarn, then computing the bulkiness of the yarn by using the following expression; and the measuring method can be used for simply and rapidly measuring the bulkiness of a high-bulk yarn.

Description

The sign and the measuring method of the bulk performance of a kind of blanket textile yarn

Technical field

The invention belongs to field of textiles, it is a kind of sign and measuring method of the general bulk performance of textile yarn, is mainly used in the quality monitoring of high-loft yarn.

Background technology

Quality monitoring for textile yarn, bulking intensity is a quality index commonly used, particularly comprise after the long filament textured yarn appearance of chemical-fibres filaments textured yarn, acrylic staple fibre bulky yarn and silk high bulk yarn etc., the importance of this project indicator is highlighted, and bulking intensity becomes the index that textured yarn at first will be examined.The measuring method of bulking intensity is more, and rolling density method, suction method, photoelectric method and glass tube method etc. are arranged.Wherein use many rolling density methods etc. that has.

The rolling density method is production plant's method commonly used now, only use at a certain certain variations yarn kind, bulking intensity index test result for the textured yarn of variety classes, different material and different size does not have comparability and versatility, bulking intensity for the non-varicosity yarn of traditional staple fibre can't be tested especially, so also not too big ([1] Dupont Technical InformationBulletin of this method meaning in theory, X-154,1961,10:37～38; [2] S.Ghosh, R.Grindle, M.Hill.Practicalapproach to air-textured yarn bulk measurement in relation to processparameters[J] .Chemical Fiber International.1999,49 (5): 436～438; [3] B.C.Goswami, J.G.Martindaleand, L.Scardino.Textile Yarns Technology[M], NewYork:A Wiley-Interscience Publication, 1977,27 (12): 393～396; [4] A.Mukhopadhyay, R.C.D.Kaushik, V.K.Kothari.Measuring bulk of air-jet texturedyarns[J] .Textile Asia, 30 (2) 1999:23～25; [5] A.Mukhopadhyay, R.C.D.Kaushik, V.K.Kothari.Effect of air-jet texturing process variables on physical bulk obtainedby image analysis method[J] .Indian Journal of Fibre ﹠amp; Textile Research, 2000,25 (12): 264～270; [6] king bears. multiple deformation processing of chinlon 6 filament and yarn formation structure performance [D] thereof, Donghua University, 2004:8～16.), existing method purpose is not sign and the test problem that solves the bulk performance of all yarns, does not see the seek peace relevant report of method of testing of the bulk performance general purpose table of relevant textile yarn as yet.

Summary of the invention

The present invention proposes and has designed the bulking intensity substance model of textile yarn first, and has finished textile yarn on this basis, the sign and the measuring method of the bulk performance of particularly a kind of blanket textile yarn, the i.e. bulk performance characterization and the measurement of textured yarn.

1. the sign of textile yarn bulking intensity

Certain section yarn bulk:

$\mathrm{\ω}(\%)=\frac{V_a}{V_a+V_f}\×100---\left(1\right),$

V in the formula _aBe interfibrous pore volume (cm in certain section yarn ³); V _fCumulative volume (the cm that accounts for for fiber in certain section yarn ³), because V _aBe difficult to directly measure, can make the following assumptions:

For certain section yarn, suppose to work as V _aWhen being tending towards infinitely small, the volume of this section yarn just equals the volume summation of its inner all fibres so, can abstractly think that this section yarn is exactly the constant solid cylinder of cumulative volume that is made of certain identical fibre raw material, as shown in Figure 1, this section ideal yarn just is called yarn bulk substance model.The volume density ρ of yarn substance ₀Equal the volume density of this kind fiber, the bulking intensity of yarn substance is zero.So just can derive by (1) formula:

$\mathrm{\ω}(\%)=\frac{V_a}{V_a+V_f}\×100=\frac{{\mathrm{\ρ}}_0-\mathrm{\ρ}}{{\mathrm{\ρ}}_0}\×100---\left(2\right),$

ρ is the volume density (g/cm of yarn in the formula ³), can measure; ρ ₀Volume density (g/cm for the yarn substance ³), be known number, so yarn bulk can characterize applicable all yarns with (2) formula.

2, the method for testing of yarn bulk

Order $K=\frac{{\mathrm{\ρ}}_0}{\mathrm{\ρ}},$ Then have

$\mathrm{\ω}(\%)=(1-\frac{1}{K})\×100---\left(3\right),$

Wherein, K is defined as bulk index, and dimensionless, its value are any number greater than 1.K is done further to derive:

$K=\frac{{\mathrm{\ρ}}_0}{\mathrm{\ρ}}=\frac{{\mathrm{\ρ}}_0}{\frac{M}{S\·l}}=\frac{S\·{\mathrm{\ρ}}_0}{N_{\mathrm{tex}}}\×{10}^5=\frac{\mathrm{\π}{D}^2{\mathrm{\ρ}}_0}{4\·N_{\mathrm{tex}}}\×{10}^3,$

$=\frac{\mathrm{\π}}{4}{\mathrm{\ρ}}_0\·\frac{D^2}{N_{\mathrm{tex}}}\×{10}^3=A\·\frac{D^2}{N_{\mathrm{tex}}}\×{10}^3---\left(4\right)$

$\mathrm{\ω}(\%)=(1-\frac{1}{K})\×100=(1-\frac{1}{\frac{A\·D^2}{N_{\mathrm{tex}}}\×{10}^3})\×100=(1-\frac{N_{\mathrm{tex}}}{A\·D^2\×{10}^3})\×100---\left(5\right),$

In the formula, M is quality of yarn (g); S is the cross-sectional area (cm of yarn ²); L is the length (cm) of yarn; N _TexThe line density of yarn (tex); D is the diameter (mm) of yarn;

Measure the line density and the apparent diameter of yarn of yarn, adopt following formula (5) just can calculate the bulking intensity that obtains yarn then.

Innovative point of the present invention:

1, proposes and designed the substance model of textile yarn first, and provided definition for the bulking intensity index of textile yarn on this basis, derived the expression formula and the measuring method of this index with general applicability.

2, method of testing is convenient, and is with low cost, has actual operability, is widely used in the production and the theoretical research of all kinds of textile yarns.

Description of drawings

Fig. 1 textile yarn bulking intensity substance model

Embodiment

The present invention will be helped further to understand by following embodiment, but content of the present invention can not be limited.

Embodiment:

1, raw material

Select 19 on sample yarn altogether for use, its classification, composition and specification see table 1 for details.

2, testing tool and method

● measure the line density of yarn with surveying long weight method.

● measure the diameter of yarn with EIB.

EIB is the detecting instrument that is used to evaluate yarn appearance quality that U.S. LASWON-HEMPHILL company releases, and full name is the yarn test instrument that resolution is the highest so far Electronic Inspection Board (electronic yarn check-out console).Under the Appearance of EIB functional status, measure the Average Diameter of the diameter projected item of yarn object.EIB can record the radial diameter parameter of three yarns under different functional statuses: the Average Diameter (population mean diameter) under the Reference Diameter (reference diameter) under the Reference Diameter state, the Average Diameter (apparent mean diameter) under the Appearance state and the Hairiness state.

3 test results

According to the EIB testing result of each sample, can calculate the bulking intensity ω (%) of each sample by formula 4, formula 5, see table 1 for details.

The bulking intensity test result of all kinds of yarns of table 1

The coiling method bulking intensity test result contrast of all kinds of yarns of table 2

Claims (1)

1. the sign of the bulk performance of textile yarn and measuring method is characterized in that measuring the line density and the apparent diameter of yarn of yarn, adopt following formula to calculate the bulking intensity that obtains yarn then:

$\mathrm{\ω}(\%)=(1-\frac{N_{\mathrm{tex}}}{A\·D^2\×{10}^3})\×100,$

Wherein, N _TexThe line density of yarn; D is the diameter (mm) of yarn;

ρ ₀Volume density g/cm for the yarn substance ³

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