Identifications for different Leather

Leather is the dried, toughened, tanned and dyed skin or hide of an animal. Usually available with the hair removed form. These animal skins and hides treated to preserve and make them suitable for use as much as long. By the process of tanning these skins are converts into a stable and non decaying material.

Uses and Benefits of Leather:

Leather is naturally versatile material, warm in winter and cool in summer. There is almost no other natural fabric has the insulation characteristics that allow both ventilation and evaporation to take place. Genuine leather provides the service and durability.

Leather is use to prepare leather apparel and leather garments like leather Jackets, leather coats, leather lingerie, leather pants and Leather undergarments. Leather shoes are also commonly used all over the world. Leather backpack, leather briefcase, leather bags and leather purses also have very important significance in our daily life

In its broadest sense, leather is any type of tanned animal hide. Different types of leather are characterized by both the type of animal skin used and the tanning and manufacturing methods employed. The most common types of leather are made from cow hide, but leather from other animals, such as kangaroos and ostriches, is also popular in certain applications. Different types of leather are suited to different purposes, including clothing, footwear, luggage, book binding, and drums.

A variety of animal skins are used to produce different looks in leather. Once leather is tanned and processed, certain sections are selected for use on a particular application. It will then go through another series of processing and splitting for each application. Leather quality is determined by the actual processes and chemicals used in its production. Respectable manufacturers use high quality in the production of furniture, car upholstery, as well as jackets and clothing. Lower priced leather on the other hand, means lower quality and is less durable in the long run.

An animal hide can be made into leather by a number of different methods, each of which lends different properties to the final product. Leather tanned with vegetable-based products is supple but can be damaged by exposure to water. Alum-tanned leather, created with aluminum salts, is less supple and can rot in water, but it can be made in much lighter shades than vegetable-tanned leather. A newer method of tanning, using chromium salts, results in a very supple leather that holds up relatively well in water. Brain-tanned leather or buckskin, made with animal brains or other emulsified oils, is washable and significantly softer than any of the above varieties, but it is also the rarest, as it is costly and time-consuming to produce.

Stiffer, more durable types of leather, suitable for use in drums, book binding, and, historically, armor, are created with different methods. Rawhide is made by scraping animal hide, treating it with lime, and stretching it throughout the drying process. Boiling in water or wax is another method used to make extremely tough types of leather.

The softer types of leather can be prepared in a few different ways. Full-grain leather, used in the finest leather products, is not altered past removing the hair and tanning the hide. Therefore, it requires raw materials of excellent quality. Top-grain leather is sanded on one side and given an artificial grain in order to hide imperfections in the raw material. The other side of this type of leather is fuzzy. Suede is fuzzy on both sides, as it is cut from the inside of an animal hide.

Other types of leather include patent leather, which has a very shiny, smooth finish, often coated with plastic; and shagreen, rough leather usually colored green. Many special types of leather are used in luxury products from gloves to pocketbooks. Belting leather is heavy and durable and can retain its shape exceptionally well. Napa leather is known for its softness, as is slunk, made from the hide of a calf fetus. Vachetta leather is typically used as a trim on handbags.

DIFFERENT TYPES OF TANNING FOR LEATHER PREPARATION

Leather is made from animal skins or hides which have been chemically treated to preserve quality and natural beauty. The chemical procedure used to ready raw animal hides for use is called "tanning."Tanning is the process of making leather, which does not easily decompose, from the skins of animals, which do. Often this uses tannin, an acidic chemical compound. Coloring may occur during tanning

VEGETABLE TANNING

Hides which have been tanned with a vegetable tanning agent solution produce flexible, but stiff leathers, such as those used in luggage, furniture, leashes, belts, hats, and harnesses.
Vegetable tanning consists of stringing hides on large frames, located inside large vats, and exposing them to tannin, a natural product found in the bark, wood, leaves and fruits of chestnut, oak and hemlock trees. Hides are transferred to many different bins during this step, each containing a stronger solution of tannin. Vegetable tanning prevents the skin from decay and shrinkage.

MINERAL TANNING

Mineral or chrome tanning is performed on skins which will be used for softer, stretchier leathers, such as those found in purses, bags, briefcases, shoes, gloves, boots, jackets, pants, and sandals.

Hides which are tanned with minerals are pickled first in an acid and salt mixture. From there, hides are soaked into a chromium-sulfate solution. This process is much faster than vegetable tanning, and is usually a 1-day project. . It is also known as wet-blue for its color derived from the chromium. More esoteric colors are possible using chrome tanning.

Aldehyde-tanned leather is tanned using glutaraldehyde or oxazolidine compounds. This is the leather that most tanners refer to as wet-white leather due to its pale cream or white color. It is the main type of "chrome-free" leather, often seen in shoes for infants, and automobiles. Formaldehyde tanning (being phased out due to its danger to workers and the sensitivity of many people to formaldehyde) is another method of aldehyde tanning. Brain-tanned leathers fall into this category and are exceptionally water absorbent. Brain tanned leathers are made by a labor-intensive process which uses emulsified oils, often those of animal brains. They are known for their exceptional softness and their ability to be washed. Chamois leather also falls into the category of aldehyde tanning and like brain tanning produces a highly water absorbent leather. Chamois leather is made by using oils (traditionally cod oil) that oxidize easily to produce the aldehydes that tan the leather to make the fabric the color it is

Synthetic-tanned leather is tanned using aromatic polymers such as the Novolac or Neradol types. This leather is white in color and was invented when vegetable tannins were in short supply, i.e. during the Second World War. Melamine and other amino-functional resins fall into this category as well and they provide the filling that modern leathers often require. Urea-formaldehyde resins were also used in this tanning method until dissatisfaction about the formation of free formaldehyde was realized.

Alum-tanned leather is tanned using aluminium salts mixed with a variety of binders and protein sources, such as flour, egg yolk, etc. Purists argue that alum-tanned leather is technically "tawed" and not tanned, as the resulting material will rot in water. Very light shades of leather are possible using this process, but the resulting material is not as supple as vegetable-tanned leather

Oil tanning

The familiar wash leather (chamois or ‘chammy’)is tanned with unsaturated oil and the preferred agent is cod lever oil. Useful tanning oils contain fatty acids,either free or as glyceride derivates, which are poly unsaturated. The degree of unsaturation is critical, because if there is too little unsaturation the oil will not oxidize readily and therefore function only as lubricant, if there is too much unsaturation the oil will crosslink itself and harden with oxidation,like linseed oil.

Identifications for different Leather

Leather is the dried, toughened, tanned and dyed skin or hide of an animal. Usually available with the hair removed form. These animal skins and hides treated to preserve and make them suitable for use as much as long. By the process of tanning these skins are converts into a stable and non decaying material.

Uses and Benefits of Leather:

Leather is naturally versatile material, warm in winter and cool in summer. There is almost no other natural fabric has the insulation characteristics that allow both ventilation and evaporation to take place. Genuine leather provides the service and durability.

Leather is use to prepare leather apparel and leather garments like leather Jackets, leather coats, leather lingerie, leather pants and Leather undergarments. Leather shoes are also commonly used all over the world. Leather backpack, leather briefcase, leather bags and leather purses also have very important significance in our daily life

In its broadest sense, leather is any type of tanned animal hide. Different types of leather are characterized by both the type of animal skin used and the tanning and manufacturing methods employed. The most common types of leather are made from cow hide, but leather from other animals, such as kangaroos and ostriches, is also popular in certain applications. Different types of leather are suited to different purposes, including clothing, footwear, luggage, book binding, and drums.

A variety of animal skins are used to produce different looks in leather. Once leather is tanned and processed, certain sections are selected for use on a particular application. It will then go through another series of processing and splitting for each application. Leather quality is determined by the actual processes and chemicals used in its production. Respectable manufacturers use high quality in the production of furniture, car upholstery, as well as jackets and clothing. Lower priced leather on the other hand, means lower quality and is less durable in the long run.

An animal hide can be made into leather by a number of different methods, each of which lends different properties to the final product. Leather tanned with vegetable-based products is supple but can be damaged by exposure to water. Alum-tanned leather, created with aluminum salts, is less supple and can rot in water, but it can be made in much lighter shades than vegetable-tanned leather. A newer method of tanning, using chromium salts, results in a very supple leather that holds up relatively well in water. Brain-tanned leather or buckskin, made with animal brains or other emulsified oils, is washable and significantly softer than any of the above varieties, but it is also the rarest, as it is costly and time-consuming to produce.

Stiffer, more durable types of leather, suitable for use in drums, book binding, and, historically, armor, are created with different methods. Rawhide is made by scraping animal hide, treating it with lime, and stretching it throughout the drying process. Boiling in water or wax is another method used to make extremely tough types of leather.

The softer types of leather can be prepared in a few different ways. Full-grain leather, used in the finest leather products, is not altered past removing the hair and tanning the hide. Therefore, it requires raw materials of excellent quality. Top-grain leather is sanded on one side and given an artificial grain in order to hide imperfections in the raw material. The other side of this type of leather is fuzzy. Suede is fuzzy on both sides, as it is cut from the inside of an animal hide.

Other types of leather include patent leather, which has a very shiny, smooth finish, often coated with plastic; and shagreen, rough leather usually colored green. Many special types of leather are used in luxury products from gloves to pocketbooks. Belting leather is heavy and durable and can retain its shape exceptionally well. Napa leather is known for its softness, as is slunk, made from the hide of a calf fetus. Vachetta leather is typically used as a trim on handbags.

Different Types of Tanning for Leather Preparation

Leather is made from animal skins or hides which have been chemically treated to preserve quality and natural beauty. The chemical procedure used to ready raw animal hides for use is called "tanning."Tanning is the process of making leather, which does not easily decompose, from the skins of animals, which do. Often this uses tannin, an acidic chemical compound. Coloring may occur during tanning

VEGETABLE TANNING

Hides which have been tanned with a vegetable tanning agent solution produce flexible, but stiff leathers, such as those used in luggage, furniture, leashes, belts, hats, and harnesses.

Vegetable tanning consists of stringing hides on large frames, located inside large vats, and exposing them to tannin, a natural product found in the bark, wood, leaves and fruits of chestnut, oak and hemlock trees. Hides are transferred to many different bins during this step, each containing a stronger solution of tannin. Vegetable tanning prevents the skin from decay and shrinkage.

MINERAL TANNING

Mineral or chrome tanning is performed on skins which will be used for softer, stretchier leathers, such as those found in purses, bags, briefcases, shoes, gloves, boots, jackets, pants, and sandals.

Hides which are tanned with minerals are pickled first in an acid and salt mixture. From there, hides are soaked into a chromium-sulfate solution. This process is much faster than vegetable tanning, and is usually a 1-day project. . It is also known as wet-blue for its color derived from the chromium. More esoteric colors are possible using chrome tanning.

Aldehyde-tanned leather is tanned using glutaraldehyde or oxazolidine compounds. This is the leather that most tanners refer to as wet-white leather due to its pale cream or white color. It is the main type of "chrome-free" leather, often seen in shoes for infants, and automobiles. Formaldehyde tanning (being phased out due to its danger to workers and the sensitivity of many people to formaldehyde) is another method of aldehyde tanning. Brain-tanned leathers fall into this category and are exceptionally water absorbent. Brain tanned leathers are made by a labor-intensive process which uses emulsified oils, often those of animal brains. They are known for their exceptional softness and their ability to be washed. Chamois leather also falls into the category of aldehyde tanning and like brain tanning produces a highly water absorbent leather. Chamois leather is made by using oils (traditionally cod oil) that oxidize easily to produce the aldehydes that tan the leather to make the fabric the color it is

Synthetic-tanned leather is tanned using aromatic polymers such as the Novolac or Neradol types. This leather is white in color and was invented when vegetable tannins were in short supply, i.e. during the Second World War. Melamine and other amino-functional resins fall into this category as well and they provide the filling that modern leathers often require. Urea-formaldehyde resins were also used in this tanning method until dissatisfaction about the formation of free formaldehyde was realized.

Alum-tanned leather is tanned using aluminium salts mixed with a variety of binders and protein sources, such as flour, egg yolk, etc. Purists argue that alum-tanned leather is technically "tawed" and not tanned, as the resulting material will rot in water. Very light shades of leather are possible using this process, but the resulting material is not as supple as vegetable-tanned leather

Oil tanning

The familiar wash leather (chamois or ‘chammy’)is tanned with unsaturated oil and the preferred agent is cod lever oil. Useful tanning oils contain fatty acids,either free or as glyceride derivates, which are poly unsaturated. The degree of unsaturation is critical, because if there is too little unsaturation the oil will not oxidize readily and therefore function only as lubricant, if there is too much unsaturation the oil will crosslink itself and harden with oxidation,like linseed oil.