Influência do recurtimento nas características físico-mecânicas de couros caprinos.

Abstract

The study was led with the objective of establishing the differences physicalmechanics of the skins of bovid with 20 and 30 Kg, tanned with chrome and recurtidas with tannin fenolico more copolimero and resin more acrylic acacia seeking the control of the quality. 24 animals of both weights were used, being half castrated. The animals were abated and, after it skins her, the skins were conserved through resfriamento. The skins were remolhadas, waxed, tanned to the chrome and cut to the middle. Twenty-four means were recurtidos with tannin fenolico more copolimero and the remaining with resin more acrylic acacia. Of the leathers, they were retired it body-of-proves them in the two directions of the number and ventral areas for the physical-mechanical rehearsals of resistance to the progressive rasgamento, to the traction and the distention of the flower" for the lastometro. The tenor of substances extraiveis was analyzed with diclorometano through chemical rehearsals, however it didn't present statistical difference among the treatments. The average of the results of the rehearsals physical-mechanics was compared by the test of " F " at the levels of 1 and 5% of probability. The objective analyses and subjective " appearance of the grain ", softness ", " firmness of the flower " and " elasticity " were appraised through rehearsals and questionnaire, and compared by the contingency table for categorical variables at the levels of 1 and 5% of probability. For the verification of the correlation between the subjectivity and objectivity of the variables rehearsals were accomplished in softimetro, pictures of the surface of the leather, count of the number of follicles primary for mm2 and elasticity. In the rehearsal of progressive rasgamento the weight of 30 Kg exercised positive effect (P <0,05). THE leather of bovid recurtido with resin more acrylic acacia also exercised significant effect in the analysis of progressive rasgamento. The two areas also came significantly different. The appearance of the grain of the leathers of the animals with 20 Kg, was revealed finer, unlike the leathers of the animals with 30 Kg. In relation to softness the statistical analysis confirmed the positive difference for the recurtente fenolico more copolimero (P <0,05), the same happened in relation to firmness of the flower". Leathers recurtidos with resin more acrylic acacia presented better elasticity than the recurtidos with recurtente fenolico more copolimero.