Curtimento artesanal de couro de tilápia (Oreochomis sp.) a partir de três curtentes naturais

Abstract

The tanning process transforms the skin, which is a highly perishable material, in leather, which is an unputrefiable material. It can be made from vegetable or mineral compounds. The objective of this study was to accomplish tanning skin tilapia (Oreochromis sp.) from cashew tree shell (Anacardium sp.), Mastic gum bark (Schinus sp.) and bark and gumo of green banana (Musa sp.). After the tanning process samples were taken, which were placed in a desiccator with Mg(NO3)2 at 23°C and 50% RH for 48 hours, was then used an EMIC dynamometer to perform tear test progressive in 5 samples of each treatment. By doing data analysis, was found that there is no significant difference between the average thickness of the hides obtained from treatments and tensile strength imposed on the progressive tearing test. It was also found that the elasticity of leather tanned with bark of cashew did not differ statistically from the others, but hides tanned with bark mastic and bark and “gumo” of green banana differed statistically differences at 5% probability. All treatments were shown samples of the odor absent, with satisfactory softness and heterogeneous texture, as well as coloring. This fact can be attributed to be done by hand and with the absence of “fulão”. The three types of treatments can be used in fishing communities for making crafts and supplementary income families.