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TFL Holding GmbH
Im Schwarzenbach 2
79576 Weil am Rhein
Germany
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| BORRON |
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BORRON® – Superheroes for all wet processes
The BORRON range provides outstanding solutions for all wet processes in a tannery.
The group of products named BORRON consist of 2 different type of products:
1. complexing agents like BORRON ST, LB and NF
2. degreasing and emulsifying agents
This 2nd group consists mainly of surfactants like BORRON A, T, DN, DNC, SE and SAF and a lipase named BORRON DL. The BORRON surfactants of the international range are specially designed to fulfil health, safety and environmental standards in all countries.
When we focus on the 2nd group we are dealing with the natural grease in the hide and the way we deal with it.
Benefits of using new TFL lipase technology:
- The lipase when used in soaking gives a faster and more uniform penetration of liming chemicals. This results in less draw and fat wrinkles and cleaner hides. The levelness of the dyeing process is greatly improved.
- As the lipase works on fat and not on the collagen and the distribution of the natural fat is improved it is possible to achieve tighter grain with fuller bellies. This leads to better cutting values and thus higher profitability for the tanner.
- In processing floats surfactants can be substantially reduced and separate more easily. Therefore grease can be removed more efficiently.
Reducing and eliminating surfactants and achieving those meaningful advantages in leather quality and waste water make the lipase product a very cost effective processing auxiliary for the beamhouse.
Natural grease
The amount of natural grease in hides and skins differs widely depending on the breed, origin, gender and age of the animal. It also varies with season. A fat content of 5 - 10% is found for pre-fleshed bovine hides, whereas pig skins may show fat contents of up to 30%.
The main components of natural grease found in bovine hides are triglycerides, phospholipids, wax esters and free fatty acids, with a typical ratio as given in table 1:
The biggest part of this grease is located on the flesh side of the hide as well as in the grain around the hair follicles (sebaceous glands). Significantly lower amounts are found in the corium, the central part of the hide (figure 1).
Effective degreasing technology
In practice it is often found that an almost complete removal of natural grease is not always beneficial for the resulting leather quality. Typical effects of a too strong degreasing are looseness, and coarseness of the grain and a decrease in physical properties like tensile-strength and tear resistance. Removing too much natural grease also means that the waste water of the degreasing process is unnecessarily loaded with fatty substances, adding to the BOD/COD value.
On the other hand a variety of problems are caused by insufficient removal of natural grease, including fatty based stains, bad odour, poor preservation and lack of inner softness. Any successful degreasing technology therefore has to be efficient regarding the removal of grease, but also flexible enough to avoid too weak or too strong degreasing on a variety of substrates with differing amounts of natural fat.
Degreasing with surfactants in soaking
In a standard soaking process for pre-fleshed hides, grease can be mobilized and effectively emulsified by i.e. a non-ionic surfactant like BORRON DN or DNC. Addition of an appropriate second surfactant like BORRON A can help to stabilize this emulsion. Typically, non-ionic surfactants used for degreasing have an HLB (hydrophilic-lipophilic balance) of around 11 - 12 (the HLB scale ranges from 0 for extremely lipophilic to 20 for extremely hydrophilic surfactants). The co-surfactant used to keep the grease in a stable emulsion ideally would have a higher HLB value with a more hydrophilic character.
The degreasing process is supported by alkaline conditions, increased temperature and mechanical action.The latest generation of surfactants for degreasing combine the effects of fat extraction and very good fat emulsification. An effective degreasing of hides with normal fat content can therefore be achieved with one single surfactant (2), very greasy hides may need a co-surfactant or the use of more alkali.
In all cases it is important that the dosage of the surfactant is adapted to the amount of fat present in the substrate. In addition to the potential problems associated with the removal of too much grease as described before, an over dosage of surfactant may also lead to the formation of a finer particle sized and more stable emulsion with the effect that the grease is then re-distributed through the cross-section of the hide.
As the grease is – unlike a fatliquoring agent – not properly fixed to the collagen, it may interfere with later steps of the leather making process, for example by forming chrome soaps with chrome or fat stains through migration to the grain surface.
Especially when the hides and skins processed were not pre-fleshed a specific problem exists since the risk to move more grease than can be emulsified is much higher than with pre-fleshed hides. In that case the risk of an over dosage of surfactant is much higher. In that case the focus should be on degreasing the hides and skins on surface only and furthermore achieving a soaking effect. In this case the real degreasing is best done after fleshing in the deliming and/or bating stage or with greasy skins even after bating or conservation pickle.
A too low dosage of surfactant on the other hand leads to improper degreasing and/or to an unstable emulsion with separation of grease, which is then forming a layer on top of the float or is settling on the hide surface, drum walls and drain pipes (figure 2 and picture 1).
The use of surfactants in other process steps
In the case of skins that are not pre-fleshed or in the case of pickle preserved skins, degreasing is best done after fleshing in the deliming and/or bating stage or with very greasy skins even after bating or conservation pickle with BORRON SE if necessary supported by SAF for emulsifying the grease.
In the case of full substance hides that were not pre-fleshed degreasing with a universal surfactant like BORRON DN or DNC after fleshing in deliming and/or bating might be necessary. With lime split hides very often no or very little surfactant is needed in this stage because there often is little grease in the grain part of the lime splitted pelt provided grease from the flesh side was not re-distributed in soaking and liming.
Application of lipase degreasing in soaking
BORRON DL, the lipase degreasing agent, can be used very effectively in the soak. This is the step in the leather making process with the highest amount of natural grease present. The higher the amount of moveable grease, the more alkali is needed to neutralize the fatty acids being formed and to keep the pH in the desired range between 9 and 10. Stabilization of the pH in this range can be assisted by addition of earth alkali based products like PELLVIT MN.
Use of lipase in other process steps
The lipase technology can also be used in other process steps than soaking. Tests were done when the lipase product was used in the beginning of the unhairing and in the beginning of deliming before pH is lowered by adding the deliming agent. This way the degreasing effect can be further improved. The improvement mainly depends on the amount of fat still present for lipase degradation in the respective process step.
The use of lipase product in all three processing steps helps to eliminate completely the use of surfactants and does have a positive effect on the fogging behaviour and the waterproof properties of leather.
Degreasing and emulsifying agents
BORRON® DN – the multitalented: Triple your benefits!
Excellent soaking, cleaning and degreasing effect!
This surfactant is specially designed as universal surfactant for all hides and skins. This enables to use one single product with an optimised performance for all beamhouse processes.
- Supports the soaking effect and enhances the penetration of other chemicals, leading to an improved lay-out and area yield
- Carries dirt very well, thus improving its removal
- Removes grease easily in all the leather making process steps
- Very good electrolyte stability
- Low foaming
Universal use for outstanding performances.
BORRON® DL – the degreaser: Increase your cutting yield!
Optimised degreasing efficiency!
Effective lipase based degreasing agent for all Beamhouse processes
BORRON DL is a special lipolytic formulation active in the alkaline pH range from 7-13 and in many cases can be used in all beamhouse processes without any additional surfactant.
- It enhances fat removal without making the grain and bellies loose. The extracted grease is easier to be separated in the water treatment plant.
- Improved defect coverage. The product improves the uniformity of dyeing and retanning and supports inner softness.
- Fine hair and hair-root reduction. BORRON DL substantially ameliorates scud loosening and hair removal
- Reduced COB/BOD.
Optimised degreasing efficiency for outstanding performances.
BORRON® SE – the special degreaser: Excellent degreaser for pickled pelts! Excellent degreasing effect!
BORRON SE is especially developed to degrease pickled pelts. In the mean time it is excellent to degrease pig skins and other very greasy material. It is best combined with BORRON SAF to emulsify the removed grease.
Optimised degreasing efficiency for outstanding performances on small skins.
BORRON® SAF – the special disperser: Disperses all grease and fatliquors! Excellent dispersing effect!
BORRON SAF is especially developed to disperse grease extracted from small skins with BORRON SE.
- Excellent dispersing action on natural fats within the leather
- Excellent for stabilising fatliquor emulsions during their application
- Keeps the wool on woolskins free from chrome-stains
- Very good wetting back properties for wet-blue and crust
Optimised dispersing action for outstanding performances.
BORRON® A – the special emulsifier: Emulsifies grease in the beamhouse! Excellent emulsifying effect!
BORRON A is especially developed for use in soaking and liming and is often combined with BORRON T.
- Very good emulsifying capacity
- Highly suitable for soaking and liming with good wetting & cleaning effects
Optimised emulsifying action for outstanding performances.
BORRON® T – the special scutting agent: Remove even the toughest scutt! Excellent scutting effect!
BORRON T is especially developed to remove scutt from the grain in bating. In soaking and liming it can be used to degrease and is optimally combined with BORRON A to emulsify the removed grease.
- Mainly used on hides and skins for the effective removal & dispersion of natural greases in soaking, liming, deliming & bating
- In bating it improves scud removal; boosts wetting-out & cleaning; quantity applied 0.2 - 0.7%
Optimised scutting action for outstanding performances.
BORRON®: Flexible Technology for outstanding performances!
Good to the Environment:
- NPE free
- More than 90% biodegradable according to OECD standards
- Contains no potentially harmful substances, thus suitable for the TFL WHITE LINE SYSTEM
Ecological leather processing must not be expensive:
- More efficiency in leather production due to optimised performance
- Unbeatable price-performance ratio
BORRON® – the perfect assistant for all wet processes leading to excellent results on all hides and skins!
- Improved cutting yield, even on extremely sensitive hides and skins
- Better leather quality with environmental benefits
- Excellent grease removal
- Optimised fogging and hydrophobic values
- Good soaking and cleaning effect
- Superior price-performance ratio
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