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In the last years the development of machine technology has radically changed the traditional application of finishing products.
MAGNOPAL DP is the solution whenever articles have to be made where full penetration of retanning agents, fatliquors and dyestuffs is requested without reducing the grain tightness of the leather.This leather was created to demonstrate the effect of the new dispersing polymer, MAGNOPAL DP.
Would you like to produce black split velour for lining and upper leather that meets challenging requirements?
TFL strongly advises on processes which remove unwanted molecular species, which can badly affect uniformity of processing. The presence of un-removed calcium, hard water and degraded fats in the skin have their own adverse effect.
The proper procedure for using bate enzymes is often disputed. Rely on TFL's experience in meeting the goals of your tanning process!
"Acid bates" are an important tool for the fine adjustment of the process to meet specific quality needs. Check the application and special properties of TFL's low pH active enzyme products.
TFL's practical evaluation of a bate's activity combines the traditional testing, with practical experience on hides. It is important therefore to judge the product on the basis of practical trials, rather than on published activity values, as the quality of the selected components is the key criteria.
Patience, as well as productivity, are considerations in bating. Enzymes are natural catalysts for chemical chance that require time to perform their functions. TFL experience shows the optimum time for the tanner's specific process objectives.
Bating involves enzymatic attack especially against no-leather making proteins in the skin. TFL shows how to make use of this powerful, natural tool in adjusting the leather's elasticity and softness and uniformity of later processes.
Removal of calcium from the hide substances after liming is essential, if the later pickling and tanning processes are to proceed. This is not as straightforward as it seems, in view of the difficulty of obtaining uniform results throughout the hides, and due to the potential water and air pollutants released. TFL is aware, and ready to advise!
Practical results show the relation between pH of the bating liquor, and the enzyme selected. TFL takes special care to recommend that the process is adjusted to achieve the best bating action. This includes recommending the measures when CO2-deliming is used.
You need to prepare a dark calf skin velour / nubuck. The selection of the raw material is, of course, very important.
The main feature of this article is good grain tightness combined with high softness and certain elasticity. The surface handle is described as elegant and silky suitable for semi aniline finishing systems.
The women's fashion trends request light nappa with a round handle. The production of this article is difficult to achieve with the typically used raw material (e.g. English domestic, New Zealand), because the weakness of the flanks does not allow sufficient homogeneity of the whole skin.
Liming is known as a main source of tannery pollution, including sulphides and nitrogen-containing compounds. TFL can offer the tanner amine-free and nitrogen-free auxiliaries to accomplish the goals of reducing pollutant load on the environment.
Beamhouse processes are known as being critical to the quality of the final leather. TFL is conscious of this as a fact, and places at the tanner's side an entire range of auxiliaries to assure uniform, controlled swelling, avoidance of "false-backs" etc.
Lime swelling has to be controlled and at the same time, the fibres of the corium must be separated. TFL has a balanced system of auxiliaries to achieve this.
Solubility of lime during beamhouse processing can be advantageous. TFL's complexing agents play a useful role for enhancing lime solubility.
Natural fat content of skin adversely affects liming, developing lime-soaps and preventing proper distribution of the beamhouse and tanning chemicals.
TFL know-how and assistance is not limited to the application of chemicals! The mechanical action of the process vessel is largely dependent upon the load in the drum, and so is critical to the success of the recipe.
Both recipe and mechanical action must be adapted to the type of raw hide / skin and to local conditions. TFL's technicians will advise on adjusting the mechanical action by adapting the speed of rotation of the drum.
Calcium hydroxide (lime) is reactive towards atmospheric or dissolved carbon dioxide. Any deposits of calcium carbonate can damage the sensitive grain layer. TFL describes procedures to prevent this occurrence, which includes application of complexing agents.
"False-backs" are caused by abrasion of the grain during liming, when the hides are in a swollen condition. TFL advises on the conditions in the drum, and the use of suitable auxiliaries to control the swelling.
The temperature within the beamhouse process liquor, especially liming, affects the cleanliness, smoothness of the grain and the degree of swelling and the uniformity of removal of fat. TFL recommends that great attention is paid to providing uniformity of process conditions, especially process temperatures throughout the year.
Making light and soft garment nappa on hair sheep or goat skins is not an easy task, because the use of a huge amount of fatliquors will bring the softness, but not the requested light weight.We propose a better solution using CORIPOL EF in the main fatliquoring step.
TFL's tools for solving the problem of colloidal (globular or non-structured proteins) material, which hinder the proper progress of tannage, extend to an extensive range of enzymes and detergents.
Very important for all types of finishing to determine if and how good it is anchored on the skin.
Dry / wet rub resistance
Dry and wet flexing
It determines the quantity of volatile substances released from the leather destined for automotive interiors.
Heat resistance.
Important test carried out exposing the leather samples to a xenon lamp for a definite time. The purpose is to determine the degrading of colour or of the appearance. Leather for upholstery or automotive interiors require a particularly higher light fastness as the "lifetime" of those articles is several years.
Perspiration rub resistance.
Resistance to abrasion.
Rub resistance to alcohol or to petrol.
Water absorption.
Water vapour permeability.
Uniform basification is achieved by means of a smooth 'titration curve' from the acid pH range of the original tanning liquor to the pH where tanning linkages with the collagen occur. TFL's expertise has ensured that simple addition of an auxiliary chemical performs this procedure without the need for detailed monitoring and control - yet the end results are consistent.
The wet-blue tanning process is a mainstay of TFL activity. It is essential this process is carried out with utmost control, using the most reliable auxiliaries to achieve consistent end-results.
TFL offers advice on the control and testing of pickle and tanning liquors. It is only when process parameters are strictly monitored that a consistent quality wet-blue can be produced.
The temperature of the pickle and tanning liquors influences the strength of the leather fibre - it also influences the rate self-basifying agents dissolve. TFL recommend close adherence to published data, and strict process control.
Specialty fatliquors are often applied in chrome tannage to achieve uniform dispersal of natural fats, and especially soft leathers. TFL has specialties which promote uniformity of results, consistent bright dyeing, and where necessary, controlled fogging properties.
Environmental concerns oblige the tanner to ensure that chrome-tanning liquors are fully utilised, with as little as possible entering the waste stream. This has been studied by TFL, with resulting auxiliaries being made available to ensure 'high exhaustion' of the chrome baths.
The product of chrome tanning, the wet-blue hide or skin, is an ideal nutrient for moulds.
TFL's detailed knowledge of the mechanism of pickling, and its impact on the tanning process, has resulted in auxiliaries which ensure the skin is properly prepared for the uniform distribution of the tanning molecules.
Pickling as a preservation of hides is widely practised, especially for small skins. TFL processes offer the tanner the assurance that the value of the skins is protected over extended periods in transit.Skins which have been stored in pickled condition for extended periods may be found with mould, and with deep creases. TFL has solutions to "rescue" the situation.
The salt concentration is usually critical in preventing acid swelling during the pickle.TFL has recommendations for the precise control of the key process.
The presence of natural fat in the hide or skin is a major source of difficulties in processing. By itself, or its fatty acid degradation products, natural fat impacts all the processes including dyeing and finishing. TFL has the appropriate solution to eliminate these adverse effects.
Drawn or shrunken grain and excessive wrinkles degrade the quality of the leather. TFL has shown how inadequate soaking can be the cause and how the appropriate enzyme treatment resolves the problem. Excessive draw when processing wet salted material can still be caused by inadequate soaking.
TFL experience, with preventing micrococcus roseus attack during brining, protects the value of the raw material.
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