Abstract

FRANCO, M.L.R.S. et al. Influence of time of the tanning process on the quality of the rabbit's skin (Oryctolagus Cunniculus). Arch. zootec. [online]. 2012, vol.61, n.235, pp.425-435. ISSN 1885-4494.  https://dx.doi.org/10.4321/S0004-05922012000300011.

This experiment was carried out to evaluate the quality of the rabbit skins in different parts and orientations of the surface, submitted at different time of processing. The rabbits were slaughtered with 70 days of age and forty skins were used. It was used a completely randomized design in a 2 x 4 factorial treatment, being in two times of processing (T1= regular time and T2= continuous time) and four positions of cut in the skin (P1= fore longitudinal and P2= fore transversal; P3= hind longitudinal and P4= hind transversal). The steps of the tanning process were soaking, fleshing, liming (3% of sodium sulphide and 4% of lime), alkaline products remotion, purge, degrease, pickling, tanning (6% of chrome salts), neutralization, retanning (4% of chrome salts), dying, grease (6% of sulfacant oils), dryness and softening. The thickness of the rabbit skins was significantly higher (p<0.05) when the continuous time technique was used (1.03 mm). The time of tanning gave different values of traction in all positions of the samples, except for the fore transversal. The hind region regardless of the time showed a less resistant skin to traction (regular time= 6.01 N/mm² and continuous time= 3.54 N/ mm²). The fore region regardless if it is a longitudinal way (37.28 N/mm) or transversal (35.71 N/mm), showed a higher resistance to tearing compared to the hind region (longitudinal= 26.78 N/mm and transversal= 25.94 N/mm) in regular time. The technique used in the regular time tanning offered a less elasticity to the rabbit skin in relation to the continuous time. The skins must be tanning by regular time because offer more resistance to traction and superior tearing than skins tanned by continuous time. The fore region showed more resistance than hind region for progressive tearing in all times of tanning. The skins of the hind longitudinal region regardless of the time showed a less resistant to traction. The regular time of tanning gave skins with less elasticity, but for progressive tearing and stretching test, the values are in the pattern for be used in clothing manufacturing, according to BASF (2005).

Keywords : Physico-mechanical tests; Rabbit skin; Resistance of leather.

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