Compositional analysis and physicochemical and mechanical testing of tanned rabbit skins

Abstract

Chemical composition and physicochemical and mechanical parameters of New Zealand White rabbit tanned skin were evaluated. Skin samples from 70-d-old males, in natura and semi-finished, were collected for evaluation. The in natura treatment comprise skins without any processing, while semi-finished treatment comprise skins after soaking, fleshing, liming, de-liming, purging, degreasing, pickling, tanning, neutralising, re-tanning and dyeing, followed by oiling, drying, stretching and softening. After tanning, samples from the dorsal and flank regions were removed for tensile and physicochemical testing in the longitudinal and transverse directions. A split plot design was used with plot treatments (leather regions: R1=dorsal and R2=flank) and subplots directions (S1=longitudinal and S2=transversal), using 10 examples per treatment. At the end of processing, the leather analysis revealed low moisture (31.76%), protein (46.48%) and fat content (24.95%), and a high ash content (8.58%). Leather presented a pH of 4.9 and contained 2.0% chromium oxide, 25.5% extractable substances in dichloromethane, and these characteristics were coupled with a higher tensile strength (10.84 N/mm 2 ) in the dorsal region. However, samples in the same region proved to have higher elasticity (64.57%) in the longitudinal direction, although there was no difference in the progressive tearing analysis (21.07-23.50 N/mm). Overall, our analyses suggest that, in this case, the tanned leather product does not have sufficient resistance for application in clothing production.

Seasonal variations in furs of Gabaly and New Zealand white rabbits and their crossbred under Egyptian semi-arid conditions

“…This obtained trend of breed effect was in disagreement with Taha et al (2017). rabbits' furs and leathers (Souza et al, 2016 andTaha et al, 2017). Although tensile strengths were lower than the acceptable range for most manufacturing purposes, the values of elongation rate and tearing strengths coincided with the reference recommended by BASF (2007).…”

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“…23 Briefly, analyzing paiche leathers tanned with chromium salts, whose thickness ranged 1.96 to 2.77 mm, these leathers showed high tensile strength (12.05% in the longitudinal direction), elasticity (83% in the transverse direction) and tear (51.74% in the central region). Since mammalian leathers tanned with chromium salts according to Souza et al 27 presented values of 9.80N mm -2 for traction for these same parameters, a stretching to rupture of at least 60%, and progressive tearing of 14.72 N mm -2 .…”

Extracción y aplicación de taninos de la almendra de mango (Mangifera indica) como curtiente para la piel ovina Santa Inés (Ovis aries)

“…Each skin was then added in a solution of 3 L of water with 1 mL of 10% sulfuric acid H 2 SO 4 (%w/v) and remained at rest for 60 minutes in order to break the collagen fibers to subsequently add 10 mL of formaldehyde to 3% and fix the hair on the skin. After this time, the skins were rinsed with plenty of water to remove the acid and formaldehyde, and the epidermis was removed from the skin (2,30). For tanning, the skins were immersed in 3 L of tannin solution (20 mL of tannin extract in 1 L of water, corresponding to the mL of tannin extract from the extraction of the 50/50 and 70/30 %v/v concentrations) for 3 days, shaking twice a day for greater fixation of the tannin in the skin.…”