Method for determining sweat resistance of skin

FIELD: medicine.

SUBSTANCE: method involves placing 10x10 cm large sample of material under test into measuring device for determining elasticity modulus Eel1 or super- elasticity modulus Esl1 of the sample. Then, the sample is kept in artificial sweat solution at room temperature during 3 days and then dried under natural conditions during 22-24 h and elasticity modulus Eel2 or super- elasticity modulus Esl2 are determined with the device. Sweat resistance value is calculated as P=(Eel2/Eel1)*100 or (Esl2/Esl1)*100, where Eel1 is the elasticity modulus of a sample in initial condition, in MPa; Eel2 is the elasticity modulus of a sample treated in artificial sweat solution, in MPa; Esl1 is the super-elasticity modulus of a sample in initial condition, in MPa; Esl2 is the super-elasticity modulus treated in artificial sweat solution in MPa.

EFFECT: high accuracy of obtained results.

 

The invention relates to light industry and can be used to determine potestati capillary-porous fibrous and film materials, such as natural and artificial leather.

There is a method of determining potestati leather, which consists in the fact that the samples examined incubated in a solution of artificial sweat for 24 hours, dried for 24 hours and this operation is repeated six times. Then determine the physico-mechanical characteristics of samples: ultimate tensile strength, elongation and hardness. To obtain comparable data use control samples, which are treated in the same way, with the only difference that instead of pot use distilled water.

Photoscontact judged by the ratio of the obtained parameters before and after testing, and the performance of the sample before the test is taken for the unit (Bernstein GOT Photoscontact and microbiological stability of leather for Shoe lining: Ref. collection "Leather industry". - M.: Createrepo, 1977. No. 6. - P.8-14).

The disadvantage of this method is its complexity, influence the direction of the cut sample (anisotropy) on the measurement accuracy.

The closest analogue of the proposed technical solution is the method of determining the pot the resistance of the skin, namely, that after six looping prototype in a solution of artificial sweat, and control in distilled water, followed by drying them during the day, determine the moduli of elasticity of the skin, and the value of potestati, expressed as a percentage, calculated by the ratio of the moduli of elasticity of the skin treated with sweat and water. Moreover, the modulus of elasticity E of the test sample and the control are calculated according to the ratio of voltage σ=9.8 MPa to the corresponding relative elongation εobtained at the voltage when tested on a tensile testing machine, according to the formula: E=σ:ε [Vasilkov, Ithuriel. Technical analysis and monitoring of the leather industry. - M: Light industry, 1972. - 232 S.].

The disadvantage of this method is the need for multiple cycles of treatment and drying, the use of distilled water as a medium of comparison, a large variation of values of potestati.

The technical result of the invention is to improve the accuracy of determining the rate of potestati and reducing the complexity of the method.

This result is achieved by a method for determining potestati skin is that the sample of the test material size 10×10 cm is placed in a measuring device for the Relaxation and to define what are the modulus of elasticity E y1or module viscoelasticity EE1, after which the sample is incubated in a solution of artificial sweat at room temperature for 3 days, then lossimouth in natural conditions for 22-24 hours and on the instrument Relax determine the modulus of elasticity EU2or module viscoelasticity EE2photoscontact skin P in percent are calculated according to the formula P=(EU2:Ey1)·100 or (EE2:EE1)·100, where Ey1- the modulus of elasticity of the original sample, MPa; FU2- the modulus of elasticity of the sample after treatment in a solution of artificial sweat, MPa; EE1- module viscoelasticity the original sample, MPa; FE2- module viscoelasticity sample after treatment in a solution of artificial sweat MPa.

A distinctive feature of the proposed method is that the test samples are incubated in a solution of artificial sweat for 3 days without intermediate drying, determination of modulus of elasticity or viscoelasticity before and after processing is performed on the device Relax on the same sample without its destruction, and the index of potestati determine the percentage of the modulus of elasticity or viscoelasticity sample treated in a solution of artificial sweat, the modulus of elasticity or viscoelasticity the original sample.

Su is the efficiency of the method is as follows.

Sample test material size 10×10 cm is placed in a measuring device for the Relaxation and determine the modulus of elasticity Ey1or module viscoelasticity EE1. The same sample after the test is placed in a vessel containing a solution of artificial sweat, with the expectation that it was completely covered with liquid. In the composition of the artificial sweat includes (150 ml): sodium chloride 3.0 g, ammonium carbonate, 0.1 g, centripetal - 0.03 g urea 3.6 g, lactic acid is 0.2, the Sample is incubated in the solution at room temperature for 3 days, after which it is removed, dried in natural conditions for 22-24 hours and re-determine the value of the modulus of elasticity or viscoelasticity on installing Relax. Photoscontact in percent is calculated as the ratio of module EU2or EE2measured after keeping the sample of the skin in a solution of artificial sweat to module Ey1or EE1of the original sample, respectively.

The moduli of elasticity and viscoelasticity are one of the main indicators characterizing the elastic-plastic properties of the skin.

Figure 1 shows the block diagram of the instrument Relax.

The instrument Relax for measuring the elastic properties of natural and synthetic materials by nondestructive method consists of mechanical the CSO unit load unloading of the sample 1, the electronic unit conversion signal 2, the system unit of the computer 3, the monitor 4, a keyboard 5, a printer 6.

Measurement accuracy: deformation - 2%, voltage - 3%. The range of stresses in the tension test: 0.2 to 2 MPa.

Tested parameters: the modulus of elasticity, modulus of viscoelasticity; time constants and viscosity coefficients of the fast and slow relaxation processes; the coefficient of plastic viscosity.

Original software includes the following programs:

- to obtain a data file separate trials;

for processing and receipt of results;

for statistical processing of multiple tests of the same sample with automatic compilation of Protocol summary table of indicators and spectrum. Is also determined by the accuracy of the approximation and error experience for each indicator. Dimensions - 275×180×70 mm unit Weight is not more than 3 kg

The device allows without destruction of the sample to investigate the deformation properties of leathers, furs, films, fabrics and other similar materials, as well as their packages by computer analysis of the relaxation process of the sample, to obtain with high precision complex to fifteen indicators of elastic, viscous and plastic properties and spectrum of relaxation times of the material on the basis of which sovershenstvovat the technology, to reliably certify the quality of the material [Burmistrov A.G., Kocherov AV Computer complex "RELAX" to assess the quality of materials // Leather-Shoe industry. - 1998. No. 1. -P.17-19].

To date, testing different materials to photoscontact on the device Relaxation was not conducted.

Figure 2 presents graphs of the variation of the moduli of elasticity of the prototype, the proposed method - B and module viscoelasticity ×10-1In the proposed method, depending on the number of cycles of processing in a solution of artificial sweat.

Figure 3 presents graphs of the variation of the moduli of elasticity of the prototype, the proposed method - B and module viscoelasticity ×10-1In the proposed method, depending on the number of cycles of processing in the water.

As is shown in figure 2 and figure 3 dependencies, changes in the elastic modulus of the samples of the skin under the action of water have larger absolute values than under the action of the artificial sweat. In this regard, the definition of potestati skin in the prototype, as the ratio of the elastic modulus of the sample under the action of sweat to the modulus of elasticity of the sample under the action of water, seems to be incorrect, since the calculated values of potestati in some cases exceed 100%.

Figure 2 and 3 shows that the modulus of elasticity and is Yakobashvili prototype change for 3 test cycles, and then remain almost constant, which allows to limit the processing time of the sample in a solution of artificial sweat three days.

Because changes in the structure of the dermis sample directly affect its elastic-plastic characteristics, more legitimate to evaluate photoscontact as the ratio of the modulus of elasticity or viscoelasticity defined after keeping the sample in a solution of artificial sweat, the modulus of elasticity or viscoelasticity the original sample.

Example 1. A sample of chrome-tanned leather for Shoe uppers size 10×10 cm is placed in a measuring device for the Relaxation and determine the modulus of elasticity Ey1. The same sample is placed in a vessel containing a solution of artificial sweat, with the expectation that it was completely covered with liquid. In the composition of the artificial sweat includes (150 ml): sodium chloride 3.0 g, ammonium carbonate, 0.1 g, centripetal - 0.03 g urea 3.6 g, lactic acid is 0.2, the Sample is incubated in the solution at room temperature for 3 days, after which it is removed, dried in natural conditions for 22 hours and re-determine the value of the modulus of elasticity EU2installation Relax. Photoscontact percentage calculated by the formula

P=(Ey2:Ey1) 100

P is the iMER 2. A sample of the lining of leather from cattle hides, size 10×10 cm are treated in a solution of artificial sweat, as in example 1, but the drying of the sample is carried out for 23 hours. Photoscontact determined according to example 1.

Example 3. A sample of the lining of the skin from leather size 10×10 cm are treated in a solution of artificial sweat, as in example 1, but drying it is carried out within 24 hours. Photoscontact determined according to example 1.

Example 4. A sample of chrome-tanned leather for Shoe uppers size 10×10 cm is placed in a measuring device for the Relaxation and define the module viscoelasticity EE1. The same sample is placed in a vessel containing a solution of artificial sweat, with the expectation that it was completely covered with liquid. In the composition of the artificial sweat includes (150 ml): sodium chloride 3.0 g, ammonium carbonate, 0.1 g, centripetal - 0.03 g urea 3.6 g, lactic acid is 0.2, the Sample is incubated in the solution at room temperature for 3 days, after which it is removed, dried in natural conditions for 22 hours and re-determine the value of the modulus of viscoelasticity EE2installation Relax. Photoscontact percentage calculated by the formula

P=(EE2:EE1)·100

Example 5. A sample of the lining of the skin of the earth with the total amount of cattle size 10× 10 cm are treated in a solution of artificial sweat, as in example 4, but the drying of the sample is carried out for 23 hours. Photoscontact determined according to example 4.

Example 6. A sample of the lining of the skin from leather size 10×10 cm are treated in a solution of artificial sweat, as in example 4, but drying it is carried out within 24 hours. Photoscontact determined according to example 4.

The test results of samples by the proposed method and the prototype presented in the table.

Analysis of the obtained data shows that the proposed method of determining potestati skin enables you to improve the accuracy of measuring 2.7-3 times, to reduce the duration of the method 3 times and the consumption of 5 times.

Table
IndicatorsExamples
123456The placeholder
The modulus of elasticity

Ey1, MPa
30,056,956,630,6 (sweat)
The modulus of elasticity

EU2, MPa
21,138,446,6&x0200A; 32,7 (water)
Photoscontact, % P=(EU2:EN1)·10070,367,582,393,6
Module viscoelasticity EE1, MPa160275274-
Module viscoelasticity EE2, MPa109179218-
Photoscontact, % P=(EE2:EE1)10068,165,179,693,6
Error definition, %5,26,05,85,26,05,816,2
The duration of the preparatory process, d44444412
The duration of the measurement modules of elasticity, min10101010101060
The number of test specimen is in, PCs1111114
The area of the sample, cm2100100100100100100500

How to determine potestati skin, which consists in the fact that the sample of the test material size 10×10 cm is placed in a measuring device for measuring the elastic-plastic properties of materials by nondestructive method to determine the modulus of elasticity Ey1or module viscoelasticity EE1, after which the sample is incubated in a solution of artificial sweat at room temperature for 3 days, then dried in natural conditions for 22-24 h and a device for measuring the elastic-plastic properties of materials by nondestructive method to determine the modulus of elasticity Ey2or module viscoelasticity EE2photoscontact skin P percentage calculated by the formula

P=(Ey2:Ey1)·100 or (EE2:EE1)·100,

where Ey1- the modulus of elasticity of the original sample, MPa;

Ey2- the modulus of elasticity of the sample after treatment in a solution of artificial sweat, MPa;

EE1- module viscoelasticity the original sample, MPa;

EE2- module viscoelasticity sample after treatment in a solution of artificial sweat MPa.



 

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