Assessing the quality of leather with hydrophobic coating
DOI:
https://doi.org/10.15587/1729-4061.2015.43344Keywords:
complex quality assessment, quality gradation, desirability parameter, nomogram, rate of quality/quality rateAbstract
Light industry has an important task of intensifying the production of leather materials with enhanced hydrophobic properties, which is aimed at providing consumers with high-quality functional and safe products. An attempt to produce materials with desirable properties must be based on a comprehensive assessment of their quality since it is natural that the newly created material may be in some respects better or worse than similar materials. Quality assessment determines whether the goods or products meet specific requirements.
We have researched the quality of leather coated with water repelling alkene-maleic composition to assess the leather quality and to prove the feasibility of launching the leather into production. Our research was based on a complex assessment of the test samples with a generalized desirability index. The complex quality assessment included: (1) analysis of the nomenclature of the current quality parameters for leather used in shoe coating, (2) choice of the nomenclature of indices for the consumer properties, (3) identification of significant individual indices in the general nomenclature hierarchy, (4) research on the consumer properties, (5) grading the indices of the consumer properties––“poor”, “satisfactory”, “good”, and “excellent”, (6) building xyd-nomograms and the tables of transition from natural performance properties x to dimensionless desirability parameters d, and (7) calculation of a complex quality index based on the generalized desirability function.
We have calculated complex quality indices for leather with hydrophobic coating under the designed technology of hydrophobic emulsion-fattening with alkene-maleic composition. These indices make up 0.812 and 0.810 respectively, which considerably exceeds the value of a complex quality index for traditionally fattened leather that comprises 0.656. The calculation results have proved the advantage of leather with hydrophobic coating over traditionally fattened leather due to the studied individual indices of the consumer properties. We have determined that parameters that largely decrease the quality of leather with hydrophobic coating include ultimate tensile strength in case of stretching and lengthening under the pressure of 10 MPa.
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Copyright (c) 2015 Наталія В’ячеславівна Лисенко, Наталія Володимирівна Омельченко, Марина Григорівна Мартосенко
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