Tightness during Post-tanning
Obtaining a tight grain while maintaining all aesthetic and functional characteristics may be difficult enough, to reduce the rejection rate by a small percentage only may seem impossible. To achieve this, factors influencing grain tightness need to be understood. Improving on tightness, in most cases, means an increase in cutting yield and thus a higher profit.
For this SmiTools the focus is on the influence of post-tanning processing. The various influences of the previous steps are too varied to discuss in a general way. Moreover, a lot of crust is made from wetblue of outside origin. Where it comes from and how it was made is not always known and the material available needs to be taken as a given fact.
Retanning and fatliquoring processes need to be developed for the leathers available under consideration of their peculiarities.
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Evaluation of (Re)tanning Effect of Leather Chemicals in a Model and a Real System
Smit & Zoon is continuously researching sustainable alternatives to leather testing, for the development of new products. Our scientists examine the use of a model to test new products, in order to save large amounts of leather and avoid the disadvantages of inevitable variations and non-standardised wet-end recipes encountered in regular testing on real leather.
On processed leathers it is sometimes observed that, over time, an undesired, white, milky film appears on top of the leather. This white layer often gives rise to debates on its origin and causes and, in some cases, leads to a claim for damages. This phenomenon is called ‘fatty spew’. The possible sources of fatty spew may be of diverse nature, they are similar in one respect. They always originate from high melting point substances.