WO2005049871A1 - Procede de d'epilation et d'ouverture de fibres sans sulfure de chaux - Google Patents

Procede de d'epilation et d'ouverture de fibres sans sulfure de chaux Download PDF

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Publication number
WO2005049871A1
WO2005049871A1 PCT/IB2003/005210 IB0305210W WO2005049871A1 WO 2005049871 A1 WO2005049871 A1 WO 2005049871A1 IB 0305210 W IB0305210 W IB 0305210W WO 2005049871 A1 WO2005049871 A1 WO 2005049871A1
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WO
WIPO (PCT)
Prior art keywords
hides
skins
range
water
lime
Prior art date
Application number
PCT/IB2003/005210
Other languages
English (en)
Inventor
Saravanabhavan Subramani
Thanikaivelan Palanisamy
Jonnalagadda Raghava Rao
Balachandran Unni Nair
Ramasami Thirumalachari
Original Assignee
Council Of Scientific And Industrial Research
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Council Of Scientific And Industrial Research filed Critical Council Of Scientific And Industrial Research
Priority to AU2003280066A priority Critical patent/AU2003280066A1/en
Priority to EP03772457A priority patent/EP1687453A1/fr
Priority to PCT/IB2003/005210 priority patent/WO2005049871A1/fr
Priority to BRPI0318609-1A priority patent/BR0318609A/pt
Priority to CNA2003801107792A priority patent/CN1878877A/zh
Publication of WO2005049871A1 publication Critical patent/WO2005049871A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
    • C14C1/00—Chemical treatment prior to tanning
    • C14C1/06—Facilitating unhairing, e.g. by painting, by liming
    • C14C1/065—Enzymatic unhairing

Definitions

  • the present invention relates to a novel dehainng and fibre opening process for complete elimination of lime and sodium sulfide. More particularly, the present invention provides an improved process for making pelt by dehainng and fibre opening employing enzyme and non- toxic silicate salt.
  • the process has enormous potential application in tanning industry for processing hides/skms in an eco-benign way without adding to pollution load.
  • Conventional leather processing involves four important operations, viz , pre-tanntng, tanning, post tanning and finishing. It includes a combination of single and multi-step processes that employs as well as expels various biological, organic and inorganic materials as described by Germann (Science and Technology for Leather into the Next Millennium, Tata McGraw-Hill Publishing Company Ltd., New Delhi, p. 283, 1999).
  • Beam house processes (liming and relim g) employ lime and sodium sulfide and purifies the skm matrix by the removal of hair, flesh and other unwanted mate ⁇ als.
  • Various application methods include pit, paddle, drum and painting on flesh side. After this stage, the hide/skin is termed as pelt.
  • Dehmmg, bating and pickling processes prepare the skin for subsequent tanning. Tanned skin matrix further retanned to gain substance, fathquored to attain required softness and dyed to preferred shades
  • hming-rehming process liquors contribute to 50-70% of the total biochemical oxygen demand (BOD) and chemical oxygen demand (COD) load from a tannery wastewater and 15-20% in the case of total solids (TS) load as reported by Aloy et al (Tannery and Pollution, Centre Technique Du Cuir: Lyon, France, 1976).
  • BOD biochemical oxygen demand
  • COD chemical oxygen demand
  • TS total solids
  • Liming removes all the interfibrous materials especially proteoglycans and produces a system of fibres and fibrils of collagen which are clean as descnbed by Campbell et al (Journal of American Leather Chemists Association, 68, 96, 1973). This is achieved by the alkali action as well as osmotic pressure built up in the skin matrix.
  • Thanikaivelan et al (Environmental Science & Technology, 36, 4187, 2002) have successfully developed lime free fibre opening process employing ⁇ -amylase. However, no successful attempt has been made to eliminate lime and sodium sulfide completely in leather processing.
  • Silicates have been widely used in various industrial applications for a long time. In leather manufacture, by contrast, the silica compounds have so far been of only minor importance.
  • Wet-white tanning agent based on sodium aluminium silicate has been reported by Zauns and Kuhm (Journal of American Leather Chemists Association, 90, 177, 1995). Silicon dioxide based tanning system has been established by Fuchs and Kupfer (Journal of American Leather Chemists Association, 90, 164, 1995).
  • Kanagaraj et al Journal of American Leather Chemists Association, 95, 368, 2000
  • the main objective of the present invention is to provide a novel dehairing and fibre opening process for complete elimination of lime and sodium sulfide, which obviates the drawbacks stated above.
  • Another objective of the present invention is to provide a complete set of beam-house processes that employs only enzyme and non-toxic chemical.
  • Yet another objective of the present invention is to provide a lime and sodium sulfide free beam-house process that totally obviates the formation of dry sludge.
  • the present invention relates to an improved process for making pelt by dehairing and fibre opening employing enzyme and non-toxic silicate salt.
  • the process has enormous potential application in tanning industry for processing hides/skins in an eco-benign way without adding to pollution load.
  • the present invention provides softer and smoother leather.
  • the present invention provides a novel dehainng and fibre opening process for complete elimination of lime and sodium sulfide, which comprises 1) adding 5-10% w/w, based on the weight of soaked hides/skins, of water to 0 5- 1.5%w/w, based on the weight of soaked hides/skins, of proteolyttc enzyme, exhibiting optimum activity at pH 7.5-11.0 and temperature 25-40°C, optionally in the presence of not more than 1.5%w/w, based on the weight of soaked hides/skins, of silicate salt, to prepare a paste, n) applying the paste, as formed in step (l), on the flesh or grain side of the hides/skins by known method, in) piling the pasted hides/skins grain to grain for a period of not less than 12 hours followed by removing the hair by known method to get dehaired hides/skins,
  • step (in) treating the dehaired hides/skins, as obtained in step (in), with 5-10% w/w, based on the weight of dehaired hides/skins, of silicate salt in presence of 50-250% w/w of water, preferably under stirnng condition, for a period of not less than 3 hrs, followed by fleshing by known method to get pelt for subsequent post fibre opening processes.
  • the proteolytic enzyme used may be selected from bactenal protease, fungal protease, either individually or in any combination.
  • the silicate salt used may be selected from sodium metasihcate, water glass, sodium orthosilicate, either individually or in combination.
  • a dehainng paste is prepared by mixing proteolytic enzyme in the range of 0.5 - 1 5% w/w, on the weight of soaked skins or hides with 5 - 10% w/w of water on the weight of soaked skins or hides, optionally in the presence of not more than 1.5% w/w of silicate salt.
  • the dehainng paste, thus prepared is applied on the flesh or grain side of the soaked skins or hides by known manual or mechanical method and the pasted hides/skins are piled grain to gram for a period of not less than 12 hrs. The skins or hides are then dehaired by conventional method.
  • the dehaired skins or hides are mixed with 50 - 250% w/w of water on the weight of dehaired skins or hides and treated with 5 - 10% w/w of silicate salt on the weight of dehaired skins or hides preferably under stirring condition, for a penod of not less than 3 hrs followed by fleshing by known method to get pelt for subsequent post fibre opening processes.
  • the novelty and non obviousness of the present development lies in using proteolytic enzymes and non-toxic silicate salt for dehairing and fibre opening, thereby providing an eco-benign biochemical based beam house process that totally eliminates the use of lime and sodium sulfide.
  • Weight of the dehaired skins was found to be 2.1 kg.
  • the dehaired goatskins were loaded in a drum with 4200 ml water. To this, 105 gms sodium orthosilicate was added to the drum. The duration of treatment was one day with 5 min running per hour for 6 hrs and left overnight in the bath. The bath was drained off and the skins were scudded using conventional beam and blunt knife technique and fleshed in a hydraulic fleshing machine. Weight of the pelts was found to be 2.8 kg. The resultant pelts were taken for further processing.
  • Example 2 Example 2
  • the dehaired skins were loaded in a drum with 7200 ml water. To this, 180 gms sodium metasilicate was added to the drum. The duration of treatment was one day with 5 min running per hour for 6 hrs and left overnight in the bath. The bath was drained off and the skins were scudded using conventional beam and blunt knife technique and fleshed in a hydraulic fleshing machine. Weight of the pelts was found to be 4.5 kg. The resultant pelts were taken for further processing.
  • the prepared paste was applied on the grain side of the cow sides and piled grain side of one side to gram side of the other and left undisturbed for 18 hrs
  • the sides were then dehaired using conventional beam and blunt knife technique. Weight of the dehaired sides was found to be 20 kg.
  • the dehaired sides were loaded in a drum with 50000 ml water. To this, 2 kg sodium metasilicate was added and the drum was run for 5 min per hour for 6 hrs and left overnight in the bath The bath was drained off and the sides were scudded using conventional beam and blunt knife technique and fleshed in a hydraulic fleshmg machine. Weight of the pelts was found to be 25 kg. The resultant pelts were taken for further processing.
  • the dehaired sides were loaded in a drum with 50000 ml water To this, 2 kg sodium metasilicate was added and the drum was run for 5 min per hour for 6 hrs and left overnight in the bath. The bath was drained off and the sides were scudded using conventional beam and blunt knife technique and fleshed in a hydraulic fleshmg machine. Weight of the pelts was found to be 25 kg. The resultant pelts were taken for further processing.
  • the dehaired calfs were loaded in a drum with 36000 ml water. To this, 360 gms water glass, 900 gms sodium metasilicate and 180 gms sodium orthosilicate were added to the drum. The duration of treatment was one day with 5 min running per hour for 6 hrs and left overnight in the bath. The bath was drained off and the calfskins were scudded using conventional beam and blunt knife technique and fleshed in a hydraulic fleshing machine. Weight of the pelts was found to be 23 kg. The resultant pelts were taken for further processing.
  • the prepared paste was applied on the flesh side of the goatskins and piled flesh side of one skin to flesh side of the other and left undisturbed for 12 hrs.
  • the skins were then dehaired using conventional beam and blunt knife technique. Weight of the dehaired skins was found to be 2.2 kg.
  • the dehaired goatskins were loaded in a drum with 1100 ml water. To this, 132 gms sodium metasilicate was added to the drum. The drum was run for 20 min per hour for 3 hrs. The bath was drained off and the skins were scudded using conventional beam and blunt knife technique and fleshed in a hydraulic fleshing machine. Weight of the pelts was found to be 2.9 kg. The resultant pelts were taken for further processing.
  • the dehaired sides were loaded in a drum with 50000 ml water. To this, 1 6 kg sodium orthosihacte and 400 g sodium metasilicate were added and the drum was run for 20 mm per hour for 10 hrs. The bath was drained off and the sides were scudded using conventional beam and blunt knife technique and fleshed in a hydraulic fleshing machine. Weight of the pelts was found to be 26 kg. The resultant pelts were taken for further processing.
  • the dehaired skins were loaded in a drum with 3800 ml water. To this, 76 gms sodium metasilicate and 114 gms sodium orthosilicate were added to the drum. The total duration of treatment was 20 mm running per hour for 3 hrs. The bath was drained off and the skins were scudded using conventional beam and blunt knife technique and fleshed in a hydraulic fleshing machine. Weight of the pelts was found to be 4.8 kg. The resultant pelts were taken for further processing
  • the product produces soft and supple leathers. 8.
  • Cheaper and commercially available chemicals and enzymes are used for the process of the present invention.
  • Pelts are easy to handle after fibre opening.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Abstract

L'utilisation de chaux et de sulfure de sodium dans la fabrication du cuir est à l'origine de bien des préoccupations environnementales. Cependant, il n'existe aucun processus d'atelier de rivière dont on pourrait éliminer totalement l'utilisation de chaux et de sulfure de sodium. Selon la présente invention, on a normalisé un nouveau procédé biochimique exploitant des enzymes spécifiques et des produits chimiques non toxiques susceptibles d'éliminer totalement l'utilisation de chaux et de sulfure de sodium dans le traitement du cuir. Il s'avère que le taux de d'épilation et d'ouverture des faisceaux de fibres est comparable à celui des cuirs chaulés traditionnels. La qualité des cuirs obtenus est égale à celle des cuirs traditionnels. Ce procédé permet également de réduire la demande chimique en oxygène et la charge totale en matières solides par rapport aux procédés traditionnels.
PCT/IB2003/005210 2003-11-18 2003-11-18 Procede de d'epilation et d'ouverture de fibres sans sulfure de chaux WO2005049871A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
AU2003280066A AU2003280066A1 (en) 2003-11-18 2003-11-18 A lime-sulphide free dehairing and fibre opening process
EP03772457A EP1687453A1 (fr) 2003-11-18 2003-11-18 Procede de d'epilation et d'ouverture de fibres sans sulfure de chaux
PCT/IB2003/005210 WO2005049871A1 (fr) 2003-11-18 2003-11-18 Procede de d'epilation et d'ouverture de fibres sans sulfure de chaux
BRPI0318609-1A BR0318609A (pt) 2003-11-18 2003-11-18 processo de abertura de fibra e remoção dos pêlos isentos de cal-sulfeto
CNA2003801107792A CN1878877A (zh) 2003-11-18 2003-11-18 一种不使用石灰－硫化物的去毛和纤维开松方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2003/005210 WO2005049871A1 (fr) 2003-11-18 2003-11-18 Procede de d'epilation et d'ouverture de fibres sans sulfure de chaux

Publications (1)

Publication Number Publication Date
WO2005049871A1 true WO2005049871A1 (fr) 2005-06-02

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PCT/IB2003/005210 WO2005049871A1 (fr) 2003-11-18 2003-11-18 Procede de d'epilation et d'ouverture de fibres sans sulfure de chaux

Country Status (5)

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EP (1) EP1687453A1 (fr)
CN (1) CN1878877A (fr)
AU (1) AU2003280066A1 (fr)
BR (1) BR0318609A (fr)
WO (1) WO2005049871A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2518928A (en) * 2013-05-15 2015-04-08 New Zealand Leather And Shoe Res Ass Method of depilation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103981296B (zh) * 2014-05-27 2016-06-08 四川大学 一种硅酸盐复合碱膨胀剂及其制备方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR940007333B1 (ko) * 1991-11-14 1994-08-13 주식회사 럭키 피혁 처리제 조성물
RU2213785C1 (ru) * 2002-11-06 2003-10-10 Федеральное государственное унитарное предприятие Центральный научно-исследовательский институт кожевенно-обувной промышленности Способ обработки кожевенного сырья

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR940007333B1 (ko) * 1991-11-14 1994-08-13 주식회사 럭키 피혁 처리제 조성물
RU2213785C1 (ru) * 2002-11-06 2003-10-10 Федеральное государственное унитарное предприятие Центральный научно-исследовательский институт кожевенно-обувной промышленности Способ обработки кожевенного сырья

Non-Patent Citations (2)

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Title
DATABASE WPI Section Ch Week 199622, Derwent World Patents Index; Class D16, AN 1996-219895, XP002287254 *
THANIKAIVELAN P. ET AL.: "Develoment of a leather processing method in narrow pH profile", JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS AND CHEMISTS, vol. 84, 2000, pages 276 - 284, XP009033236 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2518928A (en) * 2013-05-15 2015-04-08 New Zealand Leather And Shoe Res Ass Method of depilation
AU2014202616B2 (en) * 2013-05-15 2015-09-17 New Zealand Leather And Shoe Research Association Method of depilation
GB2518928B (en) * 2013-05-15 2017-03-01 New Zealand Leather And Shoe Res Ass Method of depilation

Also Published As

Publication number Publication date
CN1878877A (zh) 2006-12-13
BR0318609A (pt) 2006-10-17
AU2003280066A1 (en) 2005-06-08
EP1687453A1 (fr) 2006-08-09

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