Leather Process Technologies

CLRI has over the years built up a strong base of a wide range of technologies. Conscious efforts are made by this Institute to secure appropriate Intellectual Property (IP) Rights like PATENT (in India and abroad) and COPYRIGHT in respect of the new developments.


Waterless Chrome Tanning Technology (Wctt)

Technology Outline

  • Use of water during chrome tanning is very important for attaining uniform diffusion, distribution and hydrolysis of chromium
  • Waterless chrome tanning that eliminates the use of water, salt, sulfuric acid and basification salts during the chrome tanning process is well known
  • There is a need for the development of a product for facilitating chrome tanning without water for widespread manufacturing and application

Salient Features/ Highlights/ Advantages

  • A product composition for pre-treatment during waterless chrome tanning process
  • Complete elimination of salt and sulphuric acid
  • Complete elimination of inorganic acids
  • Reduction of Total dissolved solids in wastewater
  • No discharge of chrome containing wastewater
  • Wet blue leathers on par with the conventionally tanned leathers

Business Case and Translation Status

  • Product developed and validated at pilot scale
  • Commercial level validation on goat skins and cow hides carried out at a tannery in Ranipet
  • The product is already commercialized

Preservation-Cum-Unhairing (Pcu) Process

Technology Outline

  • Use of salt in preservation generates large amount of contaminated salt and enormous total dissolved solids (TDS) in wastewater
  • Toxic sodium sulphide is employed for conventional unhairing of hides/skins
  • A single compound performing dual functions viz. preservation and unhairing at neutral pH and ambient conditions has been developed

Salient Features/ Highlights/ Advantages

  • One step process for preservation and unhairing
  • Complete elimination of salt from preservation process
  • Reduction of TDS in wastewater
  • Treated skins/ hides can be stored for 6 months at ambient conditions without dehydration
  • Reduction in sulphide up to 70% is possible for complete removal of hair

Business Case and Translation Status

  • Technology validated at lab and pilot levels
  • Commercial level validation with l000 kg of buffalo hides carried out at M/s Kings International, Kanpur
  • The product is ready for commercialization

Odor Abatement System for Tanneries

Technology Outline

An indigenous eco-friendly integrated technology for removal of odor from tannery using biofilter is designed. Odourous gas generated from the process is passed through vent and duct and is treated in the biofilter with a removal efficiency of about 90%. A prototype is fabricated based on the design and the technology has been implemented in a commercial tannery

Salient Technical Features including Competing Features

Temperature of operation = 30-41 C, Moisture = 100% saturated gas as feed; Care & feeding: A balanced macro nutrient; Acidity= near pH 7; Flowrate: upto max 300 CFM & maximum of 200 ppm odorous gases; Filter loading = 30 CFM/Ft2; Microbial strain -CLRI; Removal efficiency = 90 % VOC, 90% NH3 & 95% H2S. Provides- occupational safety; Abates air pollution/ emission. Uses online gas sensors & monitoring system; Automatic nutrient dosing system; Eco-friendly & indigenous technology; First time in the country; Possible expansion to Poultry, Tobacco, Dairy, Fish industries.

Business Case and Translation Status

The technology has been implemented in a commercial tannery with capacity 1000 hides /day at SA Abdul Azeez & Co, Erode as a demonstration unit and is running successfully

Business Case and Translation Status

  • Tech Prototype is available at CSIR-CLRI for demonstration.
  • A commercial level technology is Designed & Commissioned at SA Abdul Aziz Tannery, BP Agaram Road, Erode, TN.
  • The product is ready for commercialization

Eo Based Zero Wastewater Discharge Process

Technology Outline

According to this technology, the waste streams from different unit processes are segregated. Gross solids are removed through screening. The sectional streams are then subjected to electro-oxidation for removing the organic pollutants using specially developed electrodes. Treated wastewater, which is free from organic pollutants, can be reused appropriately in the processes of leather manufacturing to achieve zero wastewater discharge. The residual chemicals present in the treated wastewater in many waste streams are reutilized in the process.

Salient Technical Features including Competing Features

  • No wastewater Discharge; No sludge from treatment;
  • No emission from hazardous gases; Less space requirement; Simple to operate;
  • Reduction in Water input; Reduction in chemical offer;

Business Case and Translation Status

The technology has been standardized at pilot scale. It has been demonstrated at commercial scale ten units in India and four units in Ethiopia. The technology has been transferred to four leather manufacturing units. The technology is also suitable to textile and slaughter house wastewater. The technology is already commercialized.

Dry Tanning (Dispersing Agent)

Technology Outline

Multiple benefits relating to in-process abatement of effluent problem, curtailing process steps, huge water conservation, time economy and cost saving

Salient Features/ Highlights/ Advantages

  • New composition for waterless chrome tanning
  • Time saving to the extent of about 30%
  • Delimed skins treated without addition of any water or any other liquid medium
  • Reduces number of unit operations
  • No requirement of any additional infrastructure
  • Reduces the requirement of conventional chrome tanning agent by about 50%
  • Potential saving of 15 Million Liters of water per day when adopted by the entire country

Business Case and Translation Status

  • The technology is already commercialized in India.

Rapid Fibre Opening By Cocktail Of Enzymes

Technology Outline

Rapid opening up offibre matrix to facilitate improved tanning.

Salient Features/ Highlights/ Advantages

  • Harmful lime replaced with benign enzymes
  • Fibre opening achieved in 30 minutes compared to 72 hours conventional process
  • 0.5 % (v/w) used in the place of 10% (w/w) lime
  • Paradigm shift in leather making ensuring time saving & pollution abatement
  • More suited for "Make in India for Global use11 theme

Business Case and Translation Status

  • Lab scale enzyme production;
  • Commercial scale application trials completed
  • The product is ready for commercialization

Chicken Feet Leather And Leather Products

Technology Outline

Chicken feet skin has been identified and screened as potential raw materials for leather industry to make exotic leather and products. The raw material is a by-product of poultry and is cost effective. CSIR-CLRI has developed technology to process leathers from chicken feet skins with required properties, and consequently to panels and products from chicken feet leathers. The leather process technology developed is commercially viable and affordable with no major deviation from conventional process technology. The developed technology would create opportunity for small scale leather and product industries to make wealth from waste.

Salient Features/ Highlights/ Advantages

  • Leathers with good strength characteristics and other required properties can be produced with the developed technology and different range of products can be made.
  • Processing does not involve use of sodium sulphide and there is no sludge formation during beam house process
  • Processing does not involve any machinary operations except processing drums and there is no solid waste generation.
  • Requires only mild finishing so as not to mask the natural exotic grain pattern.
  • Panel and product making requires only small cutting &stitching machines and the technology can be easily adopted by artisans.
  • Cost effectiveness, availability and exotic pattern similar to that of baby alligator with good strength properties are the uniqueness of the product.

Business Case and Translation Status

  • The leather process technology developed is commercially viable and affordable
  • The raw material is a waste product from poultry and hence is cost effective
  • Process is compatible with regular commercial process set-up (no special equipment/machinery required)
  • The technology has more societal benefits and would create opportunities for fresh entrepreneurs to start small scale leather/ leather product industries and would also lead to make wealth from waste an~ to rural industrialization. The artisan clusters producing small leather goods and small leather toys can also be benefited
  • The product is already commercialized

For further information

Head, Project Planning & Business Development
CSIR-Central Leather Research Institute

Adyar, Chennai, Tamil Nadu, India - 600 020

+91 44 24437191 +91 44 24912150

ppbd@clri.res.in & clriinfo@clri.res.in