An improved eco-friendly process for curing of raw hides and skinsThe present invention provides a salt free curing process for raw hides/skins. The curing process recited herein involves bio-macromolecules. Unlike the conventional salt based curing methods, this process does not add to the load of total dissolved solids (TDS) in the tannery waste water. The cured hides/skins can be stored upto 120 days. The invention has been applied for patent protection. (Indian Patent application no. 1491DEL2008).
A novel composition for chrome tanning of hides/ skins
The present invention provides a novel composition for chrome tanning of hides and/or skins thereby avoiding the conventional pickling operation and generation of large amounts of TDS in the waste water. In the process of the present invention the delimed hides and skins are treated with the claimed composition without affecting the tanning potency of the tanning salt followed by subsequent pH adjustment of the hides and skins with water only thereby eliminating the pickling operation and use of alkali for basification. The invention has been applied for Patent protection (Indian Patent application no. 2108DEL2008).
An improved process for making chamois leathers The present invention discloses a process for making chamois leathers using modified plant oil. The process enables total replacement of fish oil resulting in final chamois leather free from fish oil odour. The main advantage of the process is that it is a versatile process, which is applicable to all kinds of raw materials viz. goat, sheep, cow and buffalo skins/hides. Considering that chamois leather is one of the most popular articles of commerce, the process is envisaged to have enormous commercial importance.
The invention has been applied for patent protection ( Indian Patent application no. 205Del2008; Patent pending).
An improved process for the unhairing of hides/skins
The invention relates to a non-enzymatic, sulfide free hair-save process for loosening of hair/wool by way of using metal sulfite, followed by unhairing the hides/skins. The unique feature of the process is that loosening of hair is effected within a period of as low as 8 hrs. Moreover, the process takes place even at a pH 9, thereby avoiding the risk of grain getting harsh. The process not only leads to a significant reduction in pollution load in the beamhouse effluent, but also ensures that the hair/wool, recovered as the byproduct of the process, may be used for beneficial purposes. The invention has been applied for patent protection.(Indian Patent application no. 380Del1999, Patent pending).
An improved process for making chrome tanned Leathers
An improved process for making chrome tanned Leathers is provided whereby delimed pelts are treated with a mixture of conventional chrome tanning salt and alkali metal salt at a pH in the range of 5-5.5. Complete elimination of salt is effected by this process. It is envisaged to have tremendous potential application in tanning industry, not only for improved chromium uptake during tanning, but also for substantial reduction of Total Dissolved Solids (TDS) in the waste stream. The process is suitable for both hides and skins. The invention has been applied for Patent protection (Indian Patent application no. 177DEL2002;Patent pending)
A novel process for preparation of dyed leather in more than one tone The process relates to producing multi-tone dyeing on leather. It essentially regulates dye uptake selectively resulting in the formation of more than one tone on leather surface in a consistent, uniform and reproducible manner ensuring an economic option for enhancing aesthetic value of final leather. Thus the process finds enormous potential application in tanning industry not only for producing leathers for fancy articles, but also for upgrading low grade leathers, thereby resulting in substantial value addition. The process has been applied for Patent protection (Indian Patent application no. 363DEL2001; Patent pending).
A novel process of aqueous finishing for waterproof leathers. The process relates to the application of aqueous solution of film forming materials on conditioned wet leather before drying followed by conventional aqueous finishing, thereby providing a cost effective as well as eco-friendly method of finishing waterproof leather using aqueous system. The process has been applied for Patent protection (Indian Patent application no. 221DEL2001; Patent pending)
An improved process for making crust leather for transfer coat finishing
A process for making crust for transfer coat finishing is disclosed whereby tanned leather is treated with selected amino resins either individually or in combination with selected condensation product of phenol and phenyl sulfones in the wet processing of leather, which is subsequently subjected to wet buffing operation to ensure preparation of suitable surface for transfer coat finishing. It is envisaged to have enormous application in leather processing industry for converting low grade tanned leathers into high value added finished items which can be used for shoe upper and leather goods applications. The invention has been applied for Patent protection (Indian Patent application no. 343DEL2003;Patent pending)
A novel oxidative process for the unhairing of hides/skins.
A novel oxidative process of using ozone at alkaline condition is provided for the purpose of loosening hair within a time period as low as 30 minutes. The process provides an eco-friendly as well as time saving option for unhairing of hide/skin. The invention has been applied for Patent protection (Indian Patent application no. 315DEL2004;Patent pending).
An improved oxidative process for making chamois leather.
An improved oxidative process is provided whereby oil treated skin is exposed to ozone to effect complete oxidation within a period of not less than 60 minutes to produce chamois leather. The invention has been applied for Patent protection (Indian Patent application no. 312DEL2004; Patent pending).
A process for making iron tanned leather using natural polysaccharide
Iron salts have been reported to be inexpensive and non- polluting with interesting tanning abilities. The previous attempts shows that even with proper masking salts a solo iron tannage can be achieved a shrinkage temperature of 80-97oC. In this process, arabinogalactan protein complex, which is a complex natural polysaccharide, is employed as masking agent along with ferric sulphate, tartarate, and phthalate as chelating ligands. The resultant leathers show a shrinkage temperature of 108 - 110oC. It completely eliminates the use of chromium to produce boil stable leather. Strength properties of the resultant leathers are comparable to that of conventional chrome tanned leathers. This invention has enormous potential for application in leather processing industry for making wet brown leather. The new iron tanning is envisaged to be a potential alternative for Chrome tanning system. The invention has been applied for patent protection (Indian patent application no. 645Del2006; Patent pending).
An improved process for making iron tanned leather
An improved process for making iron tanned leather is provided whereby pickled hide/skin is treated with Ferric salt in presence of chelating ligand, fatty acid and aromatic polycarboxylate under controlled conditions to adjust the final pH of the leather at 3.8-4 to obtain iron tanned leather. The leather exhibits a shrinkage temperature of 100 to106oC. It completely eliminates the use of chromium to produce boil stable leather. Strength properties of the resultant leathers are comparable to that of conventional chrome tanned leathers. This invention has enormous potential application in leather processing industry for making wet brown leather. It is envisaged to be a potential alternative of Chrome tanning for making iron tanned leather. The invention has been applied for patent protection (Indian patent application no. 643Del2006; Patent pending).
An improved process for producing leathers in more than one tone
Conventionally tanned leathers are dyed in drum and this process results in producing conventional unishade leather. However, the increasing demand of fancy leather articles has over the years resulted in the requirement for leather with two-tone or even multitone effect. There are several methods to produce two tone or multi tone leathers however, each of them has its own limitations. The present process essentially relates to the preparation of multi tone leathers by selective removal of colour from dyed leathers. The invention is directed to the selective blocking of the surface to the bleaching action of ozone with the help of coating of film forming materials leading to multitone formation on leather in a consistent and uniform manner ensuring an economic option for enhancing aesthetic value of the final leather. It is envisaged to have enormous application potential in tanning industry not only for producing leathers for fancy articles, but also for upgrading lower grade leathers, thereby resulting in substantial value addition. The process has the following advantages. • It is a versatile process applicable to leathers of varying thickness and softness. • The process produces more than one tone on leather surface uniformly and consistently. • Unlike the hitherto known methods, the present process does not require any specialized skills, or any special equipment. The invention has been applied for Patent protection (Indian Patent application no. 1764DEL2006; Patent pending).
An improved process for dehairing and fibre opening of hide/skin
Global environmental regulations are changing, almost forcing all processing industries to adopt greener and cleaner manufacturing practices. Proteolytic and ∝-amylase enzymes have been found to be useful for dehairing and fibre opening process, respectively. However, this process is a two step method, in which dehairing is performed by the proteolytic enzyme followed by fibre opening through carbohydrolytic enzymes. The present invention integrates the two-step process into a single-step process, maintaining environmental sustainability. Various modes of application such as successive and simultaneous application of both the enzymes as well as application of a formulated enzyme product, which contains both proteolytic and carbohydrolytic enzymes, have been established. The extent of dehairing and fibre opening has been evaluated in comparison to the conventional or two-step enzyme based process derived skins/hides. The invention has been applied for Patent protection (Indian Patent application no. 0197DEL2007).
An unhairing composition and a process for unhairing of hide/skin therewith.
The present invention relates to an eco-friendly unhairing composition and a process for unhairing animal skins therewith. It is a versatile composition, which can be employed by pasting or in the drum to all kinds of raw materials. The composition has application in the leather industry for eco-benign leather processing by replacing toxic chemicals in the pre-tanning process. Indian Patent Application No. 202111045115.
CLRI proposes to upscale, standardize, demonstrate and commercialize, these knowledge prodcuts with the active participation from the private industry
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