| Résumé : |
To be able to reduce cost in the automotive or furniture upholstery trim, manufacturers are often inclined to use coated or finished splits in the panels that are partially or fully hidden. The flesh split, spearated at the liming stage or the tanned stage, is processed with the intention of being used as high-performance split. The dyed crust split is then roller ans spray finished as a finishde split. Alternatively, a transfer/foil coating (coated split) is used on a surface that will become the new 'grain' surface. If the split is to be finished, a pre-ground and grounding coat may need to be applied first. The pre-ground,or ground, coat takes the role of helpming adhesion, binding the nap down, filing the 'grain', and ensuring consistency of absorbency.
The main physical properties that a high-performance split must have include :
- High tear strength
- Emboss retention
- Surface and nap cleanliness
- No organge peel
- Good finish adhesion
- Tear strength
The side that ends up being the 'grain side' is decided by the tanner and is decided by the cleanliness and the thickness of the split. For normal thickness leathers, the fibre strength increases as one moves from the grain through the bulk of the corium (to a peak) and then decreases into the flesh, due to the fibre size and angle of weave. The angle of weave is lower in the flesh and grain, overall, and the fibre diameter is smaller than the corium fibres. |
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High performance splits in INTERNATIONAL LEATHER MAKER (ILM), N° 41 (05-06/2020)
