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Leather Doctor

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Conditioning

 

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Creases & Wrinkles Restoration:

 

Although pigmented leather of any fashion finishing types generally is non-absorbent, that is water droplets will pools on its surface but may not be true when comes to frequently used areas such as the seat cushion. Micro crazing develops fast in these heavily used areas besides wear that makes the finishes absorbent. The leather structure becomes exposed and fatliquor easily evaporates from these weaker areas. With loss of the fat and oil moisture contents the leather shrink, stiffen and when flexed or stressed develops creases and wrinkles at these weak points. Rectification or restoration of the creases and wrinkles is accomplished with Hydrator-3.3 > Fatliquor-5.0 > Hydrator-3.3 system after restoration cleaning with Prep-7.7 > Clean-3.8 > Rinse-3.0 system.

 

Hydrator-3.3 is applied with horsehair Brush-1 and or with FoamBrush-3 until the leather structure is fully saturated with a little moisture oozing out when press between finger and thumb. Plastic wrapped to control evaporation and is left to dwell up to 72hrs. The cushion is inspected at in between interval and stretch crosswise of creases and wrinkles helping to relax faster and topping up the moisture level to continue dwelling it to plumps up the leather.

 

At any time during the dwelling process where the objective is accomplished the dwelling process may cease and continue with the second step of fatliquoring it. The fully saturated leather is left to natural drying and as moisture evaporated while the leather is still damp Fatliquor-5.0 is applied to continue saturate it. The water contents of the fatliquor will also evaporate and leaving only the fat and oil behind. The more fatliquor is applied the softer and stronger the leather becomes when dry. Typically the maximum percentage of fatliquor content is up to 14% practice by modern tannery around the world.

 

Leather Approximate Quantity or Percentage of Fatliquor:

The quantities of fatliquor (fat and oil) contents retained in the leather after an universal tannery fatliquoring process may varies up to 14% depending on the leather types and it usage. This percentage drops as the fat and oil content diminishes or leaches through ageing, water, heat or chemical overexposure.

Leather rejuvenating or fatliquor replenishing is base on weight of the leather in relation to the percentage of remaining fatliquor. A simple calculation of percentage of fatliquor topping up requirement would be as follows:

If the weight of the leather in question is 100gm and fatliquor (fat and oil) content meter reading is less than 1%.

By applying 80gm of Fatliquor-5.0 to it will deliver an end result incremental of 13.3% fatliquor when dry as the 66.6% water contents evaporates.

In the leather rejuvenating Hydrator-3.3 > Fatliquor-5.0 > Hydrator-3.3 system, Hydrator-3.3 plays an important role by relaxing, opening up the inter-fibrillary spaces, facilitating and redistributing colloidal water movement, protonating and doing all the pre-conditioning work prior to fatliquoring including cleaning up any excess surface remnants to have a sticky-free surface. In practice the ratio for Hydrator-3.3 is 2 to 1 of Fatliquor-5.0.

It works out to be approximately 160gm of Hydrator-3.3 plus 80gm of Fatliquor-5.0 to replenish a 100gm dry leather from less than 1% back to the original tannery up to 14% fatliquor content.

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