| Résumé : |
Staking is one of the key leather making operations to soften leather and to improve its pliability. Besides the number of staking passes, there are many other factors affecting the action of staking, and consequently theresultant physical properties of staked leather. Fatliquoring, for example, is another process to soften leather and will influence the results of staking. There is no report so far, however, to demonstrate the interaction of fatliquoring and staking on softening leather. This investigation is devoted to this important subject, aiming at a better understanding of their interaction on pliability and other important properties of concern to the leather industry, such as mechanical strength, elongation, toughness and area retention. We therefore have conducted a systematic study, using the SAS statistical program, to formulate their interactive relationship on the physical properties of leather. Observation showed that the tensile strength and tear strength both increase steadily with increasing number of staking passes. This trend slowly reverses, however, as the fatliquor concentration increases. Even more intricate is the effect of fatliquor on the behavior of staking softening. Without fatliquor, staking actually stiffens the leather. Data showed the softening action of staking only becomes effective after fatliquor concentration reaches a certain level. Area measurements showed no obvious link between the amount of staking and area retention. An association was observed, however, between the residual water content and area retention. The leather after vacuum drying with less residual water content shows better area yield. |
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Staking and its interaction with fatliquoring on vacuum-dried leather in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVII, N° 9 (09/2002)
