They are natural liquid polymers, specially modified to be more similar to the leather, which interact selectively with the collagen fibres depending on the parameters that they find in the tanning bath and the hide. TECSINT PSO is also used in the preparatory stages while PSOM is more suitable for the retanning and dyeing stages; now we are going to learn more about its different uses and features.
can be used during the soaking process in different dosages depending on the origin, size and thickness of the hide. By enhancing the humectant phase of the water, it improves the stretching of the hide and almost produces a relaxing effect on the fibres.
If used at the end of pickling before adding chromium, it produces a finer grain break and increased filling; after the wet-blue splitting process, we achieve excellent compactness, fullness and a significant reduction of the veins on the leather.
can be used in the same way as TECSINT PSO at the end of pickling, producing the same results, although it slightly lightens the wet-blue shade.
During the wet-blue soaking phase, its effect is increased, and if you have dry folds caused by dry or old wet-blue, TECSINT PSOM enables to stretch them better preventing them from wrinkling on the hide that is being air dried. The best performances are achieved during the chrome retanning process before adding chromium or synthetic chromium.
During this phase, there is a greater fixation of chromium on the leather resulting in the exhaustion of the tanning baths and significantly lower concentrations of chromium in the baths; we obtain fuller and better stretched hide and, finally, when the leather is finished veins are less noticeable. The products used in the following stages, such as resins, retanning agents, fatliquors and dyes, will be more similar to the leather fibres enabling to use a lower quantity of products, while obtaining a better exhaustion of the tanning baths and more uniform leather both in terms of firmness and in the dye, which will be particularly clean, smooth and bright.
TECSINT PSOM can also be used as a dispersant in both synthetic and vegetable retanning processes; adding a dosage of 2%-5% after neutralisation favours the distribution of the retanning agents, prevents grain overload and, at the time of fixing, it favours the exhaustion of the tanning baths.
Used in the fatliquoring process, it not only has a dispersing and penetrating effect on the fatliquors, but also a filling effect favouring the filling of the sides.