It's important to lower the internal pH of the skins

It's important to lower the internal pH of the skins to somewhere between 2.8-3.0, which will allow the tanning agent to properly penetrate the skin.The 16-hour "Tanning" step involves using chromium salts which form cross-links with the collagen, thereby helping to stabilize the skin structure and preventing putrefaction or rotting. UGG Boots Outlet This step is performed at room temperature, around 25 degrees Celsius, and around a pH of 2.5-3.0. Once the tanning agent (the chromium) penetrates the skin, the process is stopped, and the chrome is fixed to the collagen by raisng the pH to 3.6 using sodium bicarbonate and heating the skins to between 35-40 degrees Celsius. In doing so, the shrinkage temperature of the skin is raised to anywhere between 60-100 degrees Celsius.Next comes "Wool Dyeing" or "Fatliquoring." This takes anywhere from 3-4 hours to complete. After the skin is tanned, the wool may be dyed any of a variety of colors. Wool dyeing needs to be done at about pH 4.5-6 and at 60-65 degrees Celsius. Special "pelt reserve agents" must be added to keep the wool dye from staining the pelt. Once the dye is stable, the pH is lowered to about 4.0 to fix the dyes to the wool, and fatliquor (emulsified oil) is added to the solution. Fatliquors are part of leather manufacturing that help to lubricate the collagen fiber and allow them to move flexibly and freely once the skin is dried. This is what makes the leather feel soft.Drying of the skins then takes 4-24 hours. Forced air dryers are used with the skins stretched across a frame. Drying occurs at 50-80 degrees Celsius.Drycleaning must then take place over the following 4-24 hours. Either a white spirit (high boiling petroleum fraction) or perchloroehtylene is used to remove any natural fat or grease that remains in the skins.Following final removal of the pelt grease, "Pelt Dyeing" or "Syntanning" comes next. Back in the paddle (the soaking vessel), the pelts are dyed in cooler temperature dyes (less than 30 degrees Celsius). This minimizes staining of the wool. After the pelt dyeing is completed, syntanning involves using synthetic tanning agents to make the pelts added fullness and firmness. Finally, the skins are dried once more.2. FinishingAfter the lengthy tanning process is complete, the final finishing is done so the skins may be used to make UGG boots.The skins must be conditioned to approximately 20% moisture content. Staking is the process by which the skins are softened and stretched, and a "nappy" surface is added to the pelt.Final "Combing," "Ironing," and "Clipping" then takes place to remove any tangles, burrs, or grass seeds that may be remaining in the wool. The wool is straightened using an iron to remove the natural crimp. Lastly, a clipping machine creates a uniform wool pile at a desired length (usually 12-15 mm).3. ManufacturingA "clicking press" is used to cut individual panels from the skins. After being cut to the right size, the panels are then sewn together using special industrial sewing machines. The soles are then glued to the boot upper, and, finally, the Ugg Boots are ready for you to purchase.Sheepskins have to be preserved properly before they can be processed into boots. Tanneries use large vessels called paddles, that hold anywhere from 3,000 to 15,000 liters of salt water and slowly swish the skins around inside. This is a gentle process that takes about 10 days to get the hides properly tanned and ready to be cut for Ugg boots.How amazing that doctors said Women UGG is not benefit for women. If they come to Ugg Australia manufactory, they will find how silly they are.