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Composition, structure and properties of immunized hair from hair-saving unhairing process / Kong Lili in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 3 (05-06/2015)
[article]
Titre : Composition, structure and properties of immunized hair from hair-saving unhairing process Type de document : texte imprimé Auteurs : Kong Lili, Auteur ; Jinwei Zhang, Auteur ; Wuyong Chen, Auteur Année de publication : 2015 Article en page(s) : p. 124-128 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bases (chimie)
Cuirs et peaux de bovins
Epilage enzymatique
Essais (technologie)
Immunisation (épilage)
Résistance chimiqueIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The immunized cattle hair from a hair-saving unhairing process was observed by Scanning Electron Microscope (SEM) and Atomic Force Microscope (AFM), and the elements in the cortex were analyzed by Energy Dispersive X-ray Spectroscopy (EDS), while the original hair was used as control. The différences of resistance to acid, alkali, oxidant and enzyme between immunized hair and original hair were also compared. The results showed that the thickness of the immunized hair squame decreased by approximately 30.01%, and the surface morphology was obviously damaged compared with the original hair. Calcium and magnésium were found in the immunized hair, while the content of sulfur decreased slightly ; the antioxidant properly of the immunized hair was improved greatly, but the acid resistance, alkali resistance and enzyme resistance were reduced significantly. In general, the composition, structure and properties of the immunized hair showed great changes after hair-saving unhairing process, these changes form the basis for the utilization of the immunized hair. Note de contenu : - EXPERIMENTAL PROCEDURES : Sample preparation - Structure and composition test - Chemical resistance test - Enzyme resistance test
- RESULTS AND DISCUSSION : Squama analysis - Elemental analysis - Property of enzyme resistanceEn ligne : https://drive.google.com/file/d/1mWpEt6etsB2aA52ZY8bli2nvwB9el-fx/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24256
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 3 (05-06/2015) . - p. 124-128[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17271 - Périodique Bibliothèque principale Documentaires Disponible Hair saving unhairing process - Part 2 - Immunization phenomenon / Carlos S. Cantera in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 85, N° 2 (03-04/2001)
[article]
Titre : Hair saving unhairing process - Part 2 - Immunization phenomenon Type de document : texte imprimé Auteurs : Carlos S. Cantera, Auteur Année de publication : 2001 Article en page(s) : p. 47-51 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux
Epilage
Immunisation (épilage)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : In its different modalities, the technology of hair saving unhairing is beginning to be applied by cowhide tanneries in several countries, replacing the traditional hair burning unhairing. The arguments ruling this technological change are : a decrease in the contamination of residual water in the wet sector and the recovery of partially degraded hair—a residue with potential industrial applications 1’2—aswell as obtaining a pelt that is suitable for the production of different types of leather. The “core” of any hair-saving unhairing process is the well known "immunization phenomenon". Note de contenu : - Immunization phenomenon
- Influence of the pH value upon the immunization phenomenon
- Balance in immunization
- Immunization in practice
- Final remarksEn ligne : https://drive.google.com/file/d/1XLkpji2WVZTkVeFCt6Ka0Trno22dNUxB/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40412
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 85, N° 2 (03-04/2001) . - p. 47-51[article]Immunisation action of sodium silicate on hair / Virgilijus Valeika in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 5 (09-10/2015)
[article]
Titre : Immunisation action of sodium silicate on hair Type de document : texte imprimé Auteurs : Virgilijus Valeika, Auteur ; Justa Sirvaityte, Auteur ; Kestutis Beleska, Auteur ; R. Alaburdaite, Auteur ; V. Valeikienè, Auteur Année de publication : 2015 Article en page(s) : p. 223-230 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Calorimétrie
Immunisation (épilage)
Peaux brutes
Silicate de sodium
Spectrométrie infrarougeIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The ability of such alkalis as calcium, barium, sodium and potassium hydroxides and sodium metasilicates to immunize wool was investigated. Sodium silicate was confirmed as an effective immunization agent whose efficiency increases with inceased tratment duration and treatment solution concentration. Sodium silicate lacks a divalent cation and acts at pH13. This allows the assumption that the immunization mechanism is other than that of calcium or barium hydroxide. Differential scanning calorimetry and infrared spectroscopy analysis results show the differences in hair structure after treatment by various alkalis. Research work is in progress to clarify the mechanism of the hair immunization by sodium silicateand to develop a unhairing processwith hair immunizationwhich is suitable for leather processing En ligne : https://drive.google.com/file/d/13id5nFtYv_VWJqo-W-x1DuFlB4GZ2Xpl/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24648
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 5 (09-10/2015) . - p. 223-230[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17501 - Périodique Bibliothèque principale Documentaires Disponible Immunisation action of sodium silicate on hair : part 2. Hair-save process based on lime substitution by sodium silicate / Justa Sirvaityte in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 99, N° 5 (09-10/2015)
[article]
Titre : Immunisation action of sodium silicate on hair : part 2. Hair-save process based on lime substitution by sodium silicate Type de document : texte imprimé Auteurs : Justa Sirvaityte, Auteur ; Kestutis Beleska, Auteur ; V. Valeikienè, Auteur ; Viktoriia Plavan, Auteur ; Virgilijus Valeika, Auteur Année de publication : 2015 Article en page(s) : p. 231-237 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Immunisation (épilage)
Peaux brutes
Silicate de sodiumIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A major contributor to the pollution from the tanning industry is conventional unhairing using sodium sulphide and lime. In this study, an attempt has been made to develop a lime-free unhairing process using sodium silicate as a hair immunization agent. The parameters of the unhairing process have also been optimized evaluating qualitative indexes of the hide during processes and the leather obtained as well. It was established that hair removal quality and chemical and strength properties of the experimental leathers are comparable to those control leathers. A significant reduction in chemical oxygen demand (COD), biochemical oxygen demand and total Kjeldahl nitrogen were obtained in comparison with the comparative data for the conventional unhairing with hair burning. Note de contenu : TABLES : 1. Parameters of processes executed in laboratory conditions - 2. Methods of unhairing and their parameters - 3. Effect of unhairing method on hide qualitative indexes - 4. Parameters of derma opening stage - 5. Effect of both unhairing and derma opening up stages on hide properties - 6. Influence of unhairing-derma opening up method on hide properties after deliming-bating and chroming - 7. Indexes of leather depending on method of unhairing-derma opening up - 8. Comparison of selected indexes of pollution load (kg/t raw hide) after unhairing-derma opening process En ligne : https://drive.google.com/file/d/1CiW_718M-ohBtYQXl99N_XUBsUK6GQpD/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24651
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 99, N° 5 (09-10/2015) . - p. 231-237[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 17501 - Périodique Bibliothèque principale Documentaires Disponible Protective effect of calcium hydroxide in hair-saving unhairing process / Hu Yang in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 97, N° 5 (09-10/2013)
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Titre : Protective effect of calcium hydroxide in hair-saving unhairing process Type de document : texte imprimé Auteurs : Hu Yang, Auteur ; Lan Liu, Auteur ; Dan Weihua, Auteur ; Dan Nianhua, Auteur Année de publication : 2013 Article en page(s) : p. 200-206 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chaux
Cuirs et peaux -- Défauts
CystineLa cystine est un acide aminé composé de deux unités cystéine liées par un pont disulfure.
Epilage
Immunisation (épilage)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : To better understand the mechanism of alkali-induced hair immunization, in this work native bovine hair was selected as the direct research subject rather than fresh salted bovine hide. The state of hair was evaluated, both before and after having undergone the procedure of immunization by measuring the changes of active groups, thermal stability, surface morphology, strength, calcium content and cystine content. The result indicates that the immunization is indeed caused by the interaction between calcium hydroxide and the cystine active center. Meanwhile, the optimum condition for immunization was: calcium hydroxide 15g/I and treatment time 90 minutes. This work may, to some extent, provide theoretical support for searching for the balance between the dehairing [hair burning] and hair saving process. Note de contenu : - IMMUNIZATION PHENOMENON
- EXPERIMENTAL PROCEDURE : Raw materials and chemicals - Tests for hair characterization - Analysis of waste liquor
- ASSAYS : Protective effect of immunization against the attack of reducing agent - Hair characterization - Pollution evaluation of the hair-saving unhairingEn ligne : https://drive.google.com/file/d/1q7gZWIMmjuSJ327BMFmwfx82EZWa1BXX/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19568
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 97, N° 5 (09-10/2013) . - p. 200-206[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 15601 - Périodique Bibliothèque principale Documentaires Disponible