Curtición de pieles caprinas con la utilización de una combinación de diferentes niveles de Caesalpinia spinosa (Tara) y ácido oxálico

Abstract

At the tanning laboratory of Animal Sciences Faculty (ASF) of ESPOCH was evaluated the goat leather tanning using a combination of different levels of Caesalpinia spinose (tara) and oxalic acid though the use of 24 goat skins that were modeled with a completely random design. The results of the analysis of the physical resistance of goats’ leather showed the best tensile strength (3297.90), elongation percentage (80.31 %) and lastometry (8.98 mm), when the leathers were tanning with 14 % tara in combination with 1 % oxalic acid producing a very resistant leather that is easily to give the shape of the article to be made and specially when the leather is exposed to friction, it does not break. The best classification of fullness (4.50 points), softness (4.8 points) and roundness (4.63 points) was achieved by tanning the leather with 14 % of tare which one corresponds to leathers with an ideal softness and fall, in this way raising the preference for the craftsman and final consumer. Vegetable tanning is considered a clean technology because the chromium tanning agent is discontinued thus physical and sensory results are obtained in the leather. The most appropriate option is tanning with 14 % tare (T2) since the cost-benefit ratio was 1.22; it means that for each dollar invested a profitability of 22 % is expected. Also should be added a very important item considered by environmental care as it not necessary primary treatments of the liquid waste