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Early detection of grain faults during wet processing / K. T. W. Alexander in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXV (Année 1990)
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Titre : Early detection of grain faults during wet processing Type de document : texte imprimé Auteurs : K. T. W. Alexander, Auteur ; M. P. Walker, Auteur ; R. M. Webster, Auteur ; A. Bugby, Auteur Année de publication : 1990 Article en page(s) : p. 191-211 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : With the growing demand for high-quality full-grain leathers and the necessity to minimise costs of re-working, the need for accurate and reliable sorting of semi-processed stock is becoming increasingly important.
During recent studies at the British Leather Confederation,a wide range of high- and low-technology approaches has been investigated to determine whether they have any potential to detect grain damage. This has led to the development of the 'Sortassist' process based on a decolorisable pigment that effectively highlights grain faults on wet blue(75 to 85 percent detection rate) or pickled stock(over 95 percent detection rate).
The pigment formulation can be applied either manually or by drum at pH>4. After grain sorting, the pigment is decolorised and chemically destroyed by a short acid-treatment step at pH<3, prior to further processing of the stock.En ligne : https://drive.google.com/file/d/1jzaDUaI72sXmrEfiuFUFsgKhVYuGxAet/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8660
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXV (Année 1990) . - p. 191-211[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 008090 - Périodique Bibliothèque principale Documentaires Disponible Environmental & safety issues - clean technology and environmental auditing / K. T. W. Alexander in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 76, N° 1 (01-02/1992)
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Titre : Environmental & safety issues - clean technology and environmental auditing Type de document : texte imprimé Auteurs : K. T. W. Alexander, Auteur ; D. R. Corning, Auteur ; N. J. Cory, Auteur ; V. J. Donohue, Auteur ; R. L. Sykes, Auteur Année de publication : 1992 Article en page(s) : p. 17-23 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather production yields emissions to water, land and air - all of which are increasingly subjected to legislative control. Furthermore, safety for employees within the work place has to ensured.
Compliance with this increasingly complex regulatory system precludes single objective approaches. Environmental auditing is a systematised approach to identifying the problems within a particular sector or production unit.
To ensure that the leather industry can effectively reduce its environmental impact, BLC is co-ordinating two international projects to provide reliable information on the real, as distinct from claimed, status of clean technologies applicable to this sector.
Monitoring of the work place and its emissions makes analytical demands beyond the scope of traditional tannery laboratories and recent developments will be reported.En ligne : https://drive.google.com/file/d/1YDQawlXsLkT4uOQdj7KGlpXsTmYHa83Y/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8643
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 76, N° 1 (01-02/1992) . - p. 17-23[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006984 - Périodique Bibliothèque principale Documentaires Disponible Influence of proteoglycan removal on opening-up in the beamhouse / K. T. W. Alexander in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXI (Année 1986)
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Titre : Influence of proteoglycan removal on opening-up in the beamhouse Type de document : texte imprimé Auteurs : K. T. W. Alexander, Auteur ; Betty M. Haines, Auteur ; M. P. Walker, Auteur Année de publication : 1986 Article en page(s) : p. 85-102 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Increased understanding of the role played by proteoglycans in determining opening-up, which in many bovine leather processes occurs concurrently with depilation, has enabled us to advance the whole concept of beamhouse work.
By combining selected proteolytic enzymes with conventional unhairing chemicals the tanner is provided with a range of options which include :
1. Accelerated processing
2. Increased opening-up of the fibre structure
3. Improved pulping and/or reduction of the requirement for sulphide
4. Replacement of the traditional bating step
5. Reduction of growth and mottle
6. Increased strength of grain leather
7. Increased area yield
Initial studies with bovine hide showed that the proteolytic action during liming speeded up removal of dermatan sulphate proteoglycan and accelerated the opening-up of the collagen fibre structure, allowing a reduction in sulphide unhairing/liming time from 18 hours to six hours. The effect was most marked in the comparatively difficult to open-up neck region and grain layer. In practical terms this greatly facilitates production of well opened-up wet blue under the constraints of a 24 hour raw to wet blue process.
En ligne : https://drive.google.com/file/d/18-j6ZDcC3cnCx99XgsckcNc86iIySiGg/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9125
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXI (Année 1986) . - p. 85-102[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 008086 - Périodique Bibliothèque principale Documentaires Exclu du prêt Natural and artificial ageing of sheepskin collagen and its importance in leather manufacture / K. T. W. Alexander in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 72 (Année 1988)
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Titre : Natural and artificial ageing of sheepskin collagen and its importance in leather manufacture Type de document : texte imprimé Auteurs : K. T. W. Alexander, Auteur ; Betty M. Haines, Auteur ; S. G. Shirley, Auteur ; R. L. Sykes, Auteur Année de publication : 1988 Article en page(s) : p. 170-176 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The stability of the collagen molecule is not constant but changes with the age of the naimal at the time of slaughter. In the case of sheep, skins from immature animals show different responses to the early stages of the leather manufacturing process and are commercially importnt. These differences are manifested by inconsistent and irregular surface appearance of the grain in the finished leather. Historically, in vitro "ageing" of semi-processed (pickled) pelts has made for more consistent leather. Work on the alternative approach of self-regulating, "chemical ageing" of untanned pelt is considered, along with an assessment of the laboratory technique developed from isometric tension phenomena which have proved most useful in monitoring these changes. A preliminary report into the role played by removal of proteoglycans in obtaining product regularity is included. Note de contenu : 1. Effect of age on the hydrothermal stability of sheepskin collagen.
2. The introduction of collagen-specific cross-links into the immature sheepskin.
3. Development of an industrial process.En ligne : https://drive.google.com/file/d/16x1Hm_YeYufGUQBz-iyfTv8JBdYeUYNB/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9109
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 72 (Année 1988) . - p. 170-176[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007134 - Périodique Bibliothèque principale Documentaires Disponible A new non-destructive leather softness test / K. T. W. Alexander in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 77, N° 5 (09-10/1993)
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Titre : A new non-destructive leather softness test Type de document : texte imprimé Auteurs : K. T. W. Alexander, Auteur ; R. G. Stosic, Auteur Année de publication : 1993 Article en page(s) : p. 139-142 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : BLC has developed a method for the non-destructive measurement of leather softness ; the portable device works on a similar principle to the lastometer, clamping and applying a load to the leather with the resultant distension giving an indication of leather softness. The load applied is typically in the order of 500 g thereby not causing any damage to the leathers.
In trials the gauge has been shown to give a good correlation between measurements and softness as graded by hand and has proved to be as reliable as any destructive method presently used for measuring leather softness.En ligne : https://drive.google.com/file/d/1GjRzhCdXyRMobZ8BlZ-ABMPQoP2sQb8J/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8436
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 77, N° 5 (09-10/1993) . - p. 139-142[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006994 - Périodique Bibliothèque principale Documentaires Disponible Tannery scale application of an isothiazoline microemulsion fungicide / R. G. Stosic in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVIII, N° 5 (05/1993)
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