Method for evaluating rigidity of enzyme-processed flax-containing yarn

FIELD: textile industry, in particular, controlling of yarn processing with enzymes in manufacture of textile materials.

SUBSTANCE: method involves processing single-twist flax-containing yarn comprising 5-50% of short flax fibers with wool and/or synthetic filaments with the use of known amounts of enzymes and conditioning; thereafter, finding out dependence between flexural rigidity defined on the basis of labor consumed for deformation at constant speed of samples of predetermined length against surface having constant curvature, sample length and curvature radius, and averaged on n samples, and number of twists until rupture occurs in direction corresponding to initial twisting of yarn, said parameters being measured after preliminary stretching of samples; measuring number of twists until rupture occurs in indicated manner; determining, on the basis of found out dependence, flexural rigidity corresponding to measured number of twists until rupture occurs.

EFFECT: increased operational efficiency and simplified evaluation of flax-containing yarn for flexural rigidity after processing of individual batches with enzymes at different times in apparatus having single charging volume substantially smaller than amount of basic yarn, and retention of flexural rigidity quality due to yarn twisting until rupture occurs.

5 dwg, 4 tbl

 

The invention relates to the field of control in the manufacture of textile materials, in particular to the field of operational and low-overhead monitoring of individual enzymatic treatments of flax-containing yarns taken from the large initial batch of yarn.

Currently, the demand for woven and knitted products, incorporating neskoromny short flax and purchased through this superior hygienic properties and attractive appearance.

Known enzymatic processing, which improves the properties of flax-containing yarn.

In the patent EP 0911441 A1 describes a modification of the yarn comprising from 30 to 100% cellulose fibers, including flax, using multienzyme preparation with endo-1,4-β-glucanase, cellobiohydrolase, carboximetilzellulozu activity, activity against filter paper performed to reduce hairiness, exfoliation and down, increasing rowmote yarn. Evaluation of enzyme (necessary to select the amount of enzyme for processing yarn) is made according to the degree of modification of the yarn.

Enzymatic processing of flax-containing yarns are usually focused on flax component yarn, thus reducing the stiffness of the yarn, the main contribution which makes flax fiber. The rigidity of the yarn bending directly influence the et on the course of technological processes of processing of the yarn and the consumer properties of woven and knitted goods, what defines the fundamental assessment of stiffness of flax-containing yarn.

When using enzymatic treatments of flax-containing yarns in the production environment there is a problem of operational control quality performance of such treatment, especially because the enzymes are sensitive to many conditions of storage and use, such as temperature, random and uncontrolled pollution can irreversibly reduce their activity. It is known that modification of flax-containing yarn gives the best results when using multienzyme preparations [Cheshkov AV Enzymatic modification of natural fibre-forming polymers in various stages of preparation of textile materials. The dissertation on competition of a scientific degree of the doctor of technical Sciences. Ivanovo. - 2005 - 35 S. - c.12], so the control enzyme preparation involves several biochemical tests for each enzymatic activity, which are characterized by increased complexity, thoroughness of execution and the use of expensive chemical reagents, and the measurement of the bending stiffness after treatment with enzymes party yarn is practically the most effective control of this technological stage.

Closest to the claimed solution method assessment of stiffness in bending) is aderrasi yarn known quantities multienzyme preparations having carboximetilzellulozu, xylanase, polygalacturonase and pectinase activity, resulting in reduced stiffness and proveto yarn containing from 10 to 100% flax required to reduce breakage of the treated yarns in the processes of weaving and knitting is [Shigaeva IV Development mechanobiology methods modification of flax fibers and materials based on it to improve their properties. The dissertation on competition of a scientific degree of candidate of technical Sciences, St. Petersburg. - 2002. - Reg. No. 04.20.02 15006 from 02.09.02. - 244 S. - p.86, 87, 158. 243]. Determination of the stiffness of the yarn bending was performed on the device IZH-3 (device Vmeshatsa). After conditioning at standard conditions of 10 samples of yarns arranged in parallel, glued on paper frame with outer dimensions of 20×20 mm and 10×10 mm, one side of the frame with a piece of thread held in the grip of the device, the opposite side of the frame with glued the threads cut off, leaving dangling loose ends of thread length 10 mm Movement of the grip about the axis on which they are mounted, led hanging yarn samples in contact with testblocks, deforming them with constant speed on the surface of the nozzle with a constant curvature. The area under the curve of the dependence of boom deflection from bending forces registered by the oscilloscope, is considered as the amount of work spent n the bend. The rigidity of the yarn bending In (CH·mm2was estimated by the amount of work required to bend her sample on a surface with constant curvature. The absolute value of bending stiffness (B) was determined by the formula:

where a is the work function, CH·mm

ρ - the radius of curvature of the bending element, mm,

l is the sample length, mm

This method for determining the stiffness in bending of flax-containing yarn treated with the specified quantities of enzymes, is time consuming, requires special equipment, highly qualified personnel needed additional consumables (paper frame, glue), and careful execution, including in the preparatory phase as gluing yarn samples manually should not lead to differences in tension and the direction of placing samples of threads, and hence the difference in their length and weight.

The technical result, which directed the claimed solution is to increase the efficiency and simplify the assessment of stiffness in bending cabled flax-containing yarn, containing short-fiber flax in an amount of 5 to 50% wool and/or synthetic fibers that are processed by enzymes in batches at different times in the apparatus having a single loading, significantly less than the number of source the yarn, while maintaining the quality assessment of stiffness in bending, due to the twisting of the yarn to break.

This object is achieved in that in the method of estimating the stiffness bending cabled flax-containing yarn comprising from 5 to 50% of short flax fibres with wool and/or synthetic fibers treated with enzymes, after pre-conditioning warp yarn samples treated with known amounts of enzymes, with constant speed on the surface with a constant curvature, calculate the amount of rigidity in bending expended bending operation, the sample length and the radius of curvature averaged values of stiffness bending over n samples, in addition, the samples treated with known amounts of enzymes, with an initial tension is subjected to torsional strain to break the yarn in the direction corresponding to the original twist of the yarn, record the number of turns before breaking, determine the average value of not less than 40 samples, identify the correspondence between the quantities of spins to break and quantities of enzymes by the values of the number of turns up to break and bending stiffness corresponding to the same amount of enzymes that establish the relationship between them, and the assessed party yarn measure the number of turns before breaking in this way, the next with the help of the installed dependencies define the stiffness of the yarn bending, corresponding to the measured number of turns before breaking.

The possibility and scope of application of the invention is illustrated by examples of a method for evaluating the stiffness in bending of flax-containing yarn as a result of processing enzymes.

Example 1. A sample of flax-containing yarn was manufactured by the hardware system Chistoprudny, as lubricant was used a 20% aqueous emulsion B-73, including mineral and castor oil, oleic acid, triethanolamine, glycerin, taken in an amount of 30% (by weight of fibers), with the addition of an antistatic preparation Coprin And nonionic product based on polyethylene glycol ethers of natural fatty acids and their amides with special additives to 1.5% (by weight of the fibers). The mass party of the yarn to be processed by enzymes, consistent with a single loading blending machine fibrous components and was 1000 kg For each laboratory processing enzymes took pieces of yarn from the bobbins, taken on one of the 5 locations warehouse boxes, after discarding 5 m of the yarn from the end of the winding, in accordance with GOST 6611.0-73. The characteristics of the yarn and its fibrous components shown in table 1 and 2.

Table 1
Features yarn
Non examplesFeatures yarn
CompositionLinear density, TexTwist
Fiber% (mass.)DirectionThe value of kr./m
1Len2535S405
Coat75
2Len590-"-390
Coat30
Polyester65
3Len5090-"--"-
Coat25
Polyester25
4Len3029-"-408
Polyamide70

In laboratory conditions skeins were washed with demineralized tap water with a temperature of 50°S, eight times, module 1:20. Then with skeins of yarn was made to drain the water and in suspended form was dried at 50°C. Farm the percentage treatment was performed in coils under stirring in a thermostatic device Scourotester" production "Textilipari Mü sze-és számitástechnikai fejlesztó vállalat" (Hungary). Characteristics of the multienzymatic preparation of Cellovyridin GH (#1-60) production LLC Preferment" (Russia) are given in table 3.

Table 2
Characteristics of the fibrous components of yarn
FiberAverage characteristics of the fibersManufacturer
Length, mmLinear density, maxDiameter, micronsMore
Linenof 40.332825Vyazemsky flax
Wool90,572023,3Merino 64-60toImport
Polyester6633017,6JSC "Kursk Khimvolokno"
Polyamide6548023,2JSC "Kursk Khimvolokno"
Table 3
Characteristics of enzyme preparations
DescriptionThe values used for enzyme preparations
Example 1Examples 2-4
The number of enzyme preparation according to the classification manufacturer#1-60#1-67/2
Activity, units/g
Karboksimetilcelljuloza21902980
β-glucanase20004100
β-silananda9502930
The protein content, mg/g220160
Final formPowderSolution

Per unit karboksimetilcelljulozojj activity is accepted the amount of enzyme that liberates 1 µmol of glucose in the hydrolysis of Na-salt of carboxyl is icellulse for 1 min (50° C, pH 5).

Per unit β-glucanase activity is accepted the amount of enzyme that liberates 1 µmol of glucose in the hydrolysis β-glucan from barley for 1 min (50°C, pH 5).

Per unit β-xylanase activity is accepted the amount of enzyme that liberates 1 µmol of xylose when using as a substrate of birch xylan for 1 min (50°C, pH 5).

The amount of enzyme preparation is summarized in table 4. The enzyme treatment was carried out in acetate buffer pH 5.0 at a temperature of 50°C for 1 h, the module baths 1:50. Then, the yarn was washed with water, treated with boiling water for 1 min and dried at 50°C.

Table 4
Indicators yarn (example 1)
The amount of enzyme, g/lThe average value of the work that went into the bend, CH·mmBending stiffness, CH·mm2The number of turns before breaking, cu./m
00,0430,178520
10,0290,120622
20,0220,091665
30,0210,087690
40,0210,087690

Then the yarn samples were subjected to mechanical tests. Before testing, all samples were kondicionirovanie not less than 24 hours at a temperature of 22°C with an error of no more than 2°C and relative humidity of 65% with an error less than 5% in accordance with GOST 10681-75.

Measurement of rigidity for bending was performed on the device IZH-3, the principle of which is described in [Lazarenko V.M. determination of the stiffness of textile materials bending // Izvestiya vuzov. The technology of light industry. - 1963. No. 6. - p.20-24], with the following settings: length of a cantilever specimens yarn 10 mm, rotation of the grip 5°the distance from the place of capture of a sample of the yarn grip to the point of contact with tetblocks 4 mm (l in the formula 1), the radius of curvature of bending of a surface with constant curvature samples was 9.1 mm (ρ in formula 1). For these settings, as well as taking into account the fact that the work expended in bending m=10 samples of yarn, the bending stiffness (In) depends on the elapsed bending (A) by the formula 2:

The importance of the work spent on the curve, the average of 30 definitions, as well as stiffness in bending is given in table 4. Figure 1 shows the dependence of the stiffness on Izgi the concentration of the enzyme (curve 1A).

The duration of training to the measurement of one sample is approximately 5 min, and one dimension of about 1 minutes

Determining the number of turns per unit length, which is necessary to inform the yarn to twist it to break in the same direction, in which is given an initial twist [Kukin G.N., Solov'ev A.N., Koblyakov A.I. Textile materials. - M.: Legprombiznes. - 1989. - 350 S. - s], was performed using a known Kretchmer marks KU-1, equipped with a movable and fixed clamps to secure the yarn and a digital display showing the number of produced a movable clamp speed. The distance between the clamps was set to 500 mm, pre-load - 10 CH. The number of turns per unit length was determined by the rotational speed of 10 rpm./C. For the result took an average of 40 definitions. The number of turns before the break when changing speed Kretchmer type RL-1 from 5 to about 10./with gives values within experimental error. It is essential that the speed allows you to distinguish between a digital display with an accuracy of one turnover.

However, the duration of a single measurement of the number of turns of the yarn to break - about 1 min

Figure 1 shows the dependence of the number of turns before breaking yarn on the concentration of the enzyme (curve 2A).

Nafig presents the dependence of the number of turns before breaking and stiffness of the yarn on the curve (curve 3).

In an industrial environment processing enzyme preparation #1-60 of the yarn wound on a perforated bobbin 10 cm in diameter, produced in the apparatus with forced circulation of the solution, the maximum load of 50 kg of yarn, module baths 1:20. The yarn was pre-washed technical demineralized water with a temperature of 50°in the same apparatus. The concentration of the enzyme was 1.5 g/l, medium - acetate buffer pH 5.0, temperature 50°C for 1 h Then the yarn was washed with water, treated with boiling water for 1 min and dried at 50°C. Sampling yarn for testing corresponded to GOST 6611.0-73.

Measured for the treated yarn, the number of turns before breaking 580 kr./m according to Figure 2, it was determined that the rigidity of the yarn bending is 0,141 CH·mm2.

Examples 2-4 are made on flax-containing yarns of a different composition (see tables 1 and 2)treated with the enzyme preparation of Cellovyridin GH (#1-67/2) production LLC Preferment" (see table 3). Fibrous mixture for the manufacture of yarns (examples 14) were prepared in the production environment blended machines in quantities of 1000 kg. Processing enzymes was performed in the aforementioned example 1 conditions, the concentration of the enzymes was: 1, 2, 4, 8, 12, 14 g/L. samples of yarn as in example 1 were identified rigidity of the curve and the number of turns before breaking (test samples 2 and 3 pre-load on crocomire was 50 mV, for sample 4-10 CH ). For examples 2-4 were obtained one correspondence between the rigidity of the yarn bending and a number of enzymes (curve 1B figure 3 - example 2, curve 1B figure 4 - example 3, curve 1 g figure 5 - example 4) and between a number of turns before breaking and a number of enzymes (curve 2B figure 3 - example 2, curve 2B figure 4 - example 3, curve 1 g figure 5 - example 4). According to the number of turns up to break and bending stiffness for these yarns is shown in Figure 2 (curve 4 - example 2, curve 5, example 3, curve 6 - example 4).

Processing enzymes in industrial conditions was performed analogously to example 1, the concentration of the enzyme was 2.5 g/l - for example 2, 5 g/l - for example 3, 3 g/l is for example 4. From the processed enzymes party yarn was collected 5 samples in accordance with GOST 6611.0-73, which was determined by the average number of turns before breaking.

For example 2 was set to the number of turns before breaking 745 kr./m, and using the relationship between bending stiffness and the number of turns until the gap is shown in Figure 3, was installed bending stiffness equal 0,366 CH·mm2. For example 3 was set to the number of turns before breaking 406 cu./m, and using the relationship between bending stiffness and the number of turns until the gap is shown in Figure 3, was installed bending stiffness equal to 0.39 CH· mm2. For example 4, it was found the number of bendings to break 1045 CR./m, and using the relationship between bending stiffness and the number of turns until the gap is shown in Figure 3, was installed bending stiffness equal 0,115 CH·mm2.

The method of estimating the stiffness in bending of flax-containing yarn processed by enzymes, including air conditioning yarn of a given length, treated with known amounts of enzymes, its deformation with constant speed on the surface with a constant curvature, the calculation of the bending stiffness of the yarn treated with a known amount of enzyme expended bending operation, the sample length and the radius of curvature averaged values of the rigidity in bending of n-number of samples, wherein the pre-samples cabled yarn, containing from 5 to 50% of short flax fibres with wool and/or synthetic fibers treated with known amounts of enzymes, with an initial tension is subjected to torsional strain to rupture of the yarn in the direction corresponding to the original twist of the yarn, record the number of turns before breaking, determine the average value of the number of samples is not less than 40, identify whether the number of turns before breaking number of enzymes, by the values of the number crucen is to divide and stiffness in bending, corresponding to the same amount of enzymes that establish the relationship between them, and the assessed party yarn measure the number of bendings to break this way, and then with the help of the installed dependencies define the stiffness of the yarn on the curve corresponding to the measured number of turns before breaking.



 

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