Soaking machines for raw skins (sheep and goat, or others) and furs. Substantially this bathtub, made of bricks, concrete, wood, or steel, is a rotating mechanical mixing mill for softness.
The drums are watertight cylindrical containers with variable size dimensions where the hides/skins are processed according to phase sequence of tanning process. Beam house; soaking for rehydration, liming for unhearing, deliming, degreasing. Subsequently pickling and tanning steps and finally utilized for retanning, fatliquoring and dyeing. The mechanical action on the hides, due to the rotations, maximize the skin's absorption of chemical compounds and induce the process reactions. The systems can be built using various materials: wood, stainless steel, polypropylene, etc. and fully automatized through control devices (es. rotation, temperature)
The fleshing process can be carried out using reciprocating machine, double introduction or continuous, single introduction. In both case the process consists of a leather passage between contrasting system such as tow rotating cylinders, one with spiral blades that operates the fleshing. The process is useful to remove the residual fleshing, and provide to make uniformity of hides thickness.
The splitting process of the hide in horizontal layers allows to reach the desired thickness and simultaneously to recover a byproduct (split) which is processed in a same way like the hide from which it derives; this operation can be done at different steps of the manufacturing process. The splitting in wet phase is practiced on tanned hides using the machines that are equipped with a circular band knife mounted on wheels, specifically designed to facilitate the hide introduction. Equipped with micrometric precision systems, such as the insertion table inclination and blade position, that ensure the thickness adjustment with very hight accuracy. The blades are automatically rebladed through grinding stones mounted on cart system.
The sammying machines are used in the tannery to squeeze the hides/skins. The combined action of cylinders covered by absorbent material and pressure the liquid of the bath etrappend into the fibers are removed . The sammying machine model are alternative type (two action) or continuous (single action).