tanning it

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Tanning it

This outline describes the tanning process, from the initial natural state to the final state when the article is prepared for any industrial or artisan use.

ganado vacuno

  HIDE Careful selection is necessary to ensure satisfactory final material characteristics (grain, surface defects, etc...)

proceso manual

  FLAYING In this step the skin of the animal is extracted (skinning). Skinning may be performed manually (which may leave knife and tool marks on the material) or mechanically (which is in extensive use in Europe).

salando pieles

  SALTING To promote conservation of the hide, layers of Sodium Chloride (common table salt (NaCl)) are placed between hide layers to protect the structure of the hides.


  SOAKING The skins are washed of blood, mud, etc. Well water from the source is preferable to surface water sources


  STRAIGHTING Na2S (Sodium Sulfide) is used to shave the hides, along with Ca(OH)2 (Calcium Hydroxide) and NaOH (Sodium Hydroxide) in basins or in drums.


  LIMING The hides are bathed in lime to effect a swelling of fibers and colagenum fibers, as well as the dissolution of hair, fats, etc.

proceso manual

  FLESHING Performed manually or mechanically, this step is necessary to eliminate residual organic material from the endodermis to avoid bacterial growth.

bombo de madera

  DELIMING All lime is removed from the hides using ammoniacal salts (Sulphates of Ammonium or Ammonium Chloride) or acid salts (such as Sodium Bisulphite). This step also smoothes the skin.

  BATING I Part of the pre-picklet one: by means of enzymatic actions the colageno fibers are alflojan to give to smoothness and firmness of grainside, etc.

bombo de madera

  DEGREASING In this step, the fats that would later inhibit the tanning process are degraded. Mineral oils or chlorinated paraffin are used to avoid undesiderable fat spots.

bombo de madera

  PICKLING Pickling is used as a conservation method and is performed with: 12-15 % common salt (NaCl) and 1.5-2.0 % sulfuric acid (H2SO4). The process is similar to the old and well-known process performed for food storage using acids and salt.

  TANNING Tanning, by definition, is the transformation of any skin into leather (including the prevention of rotting). Salts of elements like Chromium, Titanium, Aluminum are used. Also some vegetal extracts may be utilized.

  SAMMYING The leather slips to facilitate the divided operation of in blue (Chrome's color) or of reduced, to leave it to the suitable thickness. Here is where the wet phase ends.


  SPLITTING The tanned leather is divided in two layers (grain side and flesh). The removed flesh is the inferior part of the leather and can be futher subdivided one or more times (called splits) depending on the leather's thickness.

  SHAVING This step results in leathers of uniform thickness. This is a completely mechanical process.

bombo de madera

  NEUTRALISATION After the neutralization (unacidulation) we obtain a leather tanned to chromium, parked reduced and slipped (the leather is still humid).

bombo de madera

  RETANNING Retanning in drums results in final leather characteristics not obtainable by a single tanning (a fuller leather, more smoothness, to favor the dye equalization).

bombo de madera

  DRUM DYEING By adding color to the water of the drum, the dye penetrates into te cross section of the leather to avoid clear cuts in the edges.

bombo de madera

  GREASING After tanning the leather is made hard because the fibers have been united. The greasing process is performed to effect absorbtion of greasy substances to obtain a smoother and more flexible leather.

secadero aéreo 

  DRYING Drying is the elimination of the humidity of the leather to be able it to work appropriately. It is a very important process for the later quality of the desired article.


  PRE-GRADING Pre-grading is a first visual inspection and grading by quality, thickness, grain, etc. to allow for sorting of the product to different final destinations.

  PRE-FINISHING Here the leathers are prepared for the final finishing steps, including softening, trimming, grinding, wiping, etc.


  FINISHING Aniline finishing is used for the best leathers, while pigmenting is used to equal the superficial tone of the same ones. From this step forward the leathers have their own article name.


  GRADING This last selection is made solely on the basis of defects in the grain side, since the final article is complete and were leathers chosen for the same itself.

máquina de medir

  MEASURING After grading by qualities, the surface of each piece of leather is measured, the articles are packed (according to the size) at the rate of 1/2 dozen, 1 dozen, or 2 dozens per bundle.

estibando género

  SHIPPING Once packed and invoiced the articles for shipment, the articles are sent to customers. Shipping sizes range from pallets via air cargo to cardboard boxes by courier.
There are two critical phases of the most extreme importance; without them none of the above would exist: the PURCHASE and the SALE. It is in these phases where you (as our customer, agent, or supplier) are the most important part of the whole process.

We say THANK YOU for the trust you deposit with us.