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Chrome free tanning compositions and processes / William C. Prentiss in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XCVIII, N° 2 (02/2003)
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Titre : Chrome free tanning compositions and processes Type de document : texte imprimé Auteurs : William C. Prentiss, Auteur ; Marcel Siegler, Auteur ; Eleanor M. Brown, Auteur Année de publication : 2003 Article en page(s) : p. 63-69 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Totally organic tannages that start with an aromatic composition that lends itself to secondary reactions or crosslinking are one approach to the reduction or elimination of chrome as the primary tanning agent for leather. Our approach was to focus on the preparation of low molecular weight methacrylic acid copolymers with methacrylate comonomers in order to maintain a rigid-rod structure with functional groups extending from the rod. In one series we developed polymerization procedures with an aminomethacrylate monomer, to impart cationic functionality to the tanning molecule, and hydroxyethylmethacrylate to provide hydroxyl functionality for the second stage reaction. In another series, methacrolein was the only comonomer thus providing aldehyde functionality for the second stage reaction. For evaluation shrinkage temperatures were measured before and after the addition of crosslinking agents to the experimentally tanned stock. The best result for the hydroxyl functionality was 86°C obtained with glutaraldehyde, while for the aldehyde functionality the best result was 84°C obtained with oxazolidine. While lower than shrinkage temperatures obtained with chrome tanning, these values are high enough for automotive upholstery leather. Samples of these systems were retanned with a typical upholstery formulation and evaluated. These leathers met the physical requirements for automotive leathers, but we feel the retanning formulations and polymer compositions would need adjustments to improve color matching and to be certain the fatliquors are suitable for fogging tests. En ligne : https://drive.google.com/file/d/1PZLzZqy_mgDIcA6VIIdb2t9h63qe6U9E/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4095
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. XCVIII, N° 2 (02/2003) . - p. 63-69[article]Réservation
Réserver ce documentContribution toward a tanning procedure - free of chrome / Marcel Siegler in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXII (Année 1987)
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Titre : Contribution toward a tanning procedure - free of chrome Type de document : texte imprimé Auteurs : Marcel Siegler, Auteur Année de publication : 1987 Article en page(s) : p. 117-124 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Many studies and research have been conducted during tha last decade with the main purpose of replacing the present universally accepted chrome tanning by other mineral tanning procedures and/or vegetable tanning.
Aluminium salt tanning, zirconium, aldehyde tannage, syntans, vegatable extract and other combined tannages were studied in the past. Until the present time not one of the above tanning procedures was practical and/or adopted by the leather industry. This was because no one could meet the chrome tanning characteristics related to the high shrinkage temperature.
The pretanning free of chrome procedure, which is effective in increasing the Ts of the hide to 75°C, requires only minimum quantities of other tanning agents such as aluminium, vegetable extracts, or syntans, including chrome-syntans, to achieve the boil temperature and produce characteristics similar to a chrome tanned leather.
The present paper is a new contribution toward a tanning free of chrome procedure and describes different tanning agents which we believe will become the universal tanning accepted in the next century.En ligne : https://drive.google.com/file/d/1ltwsCMJHLbK3Xl-ozoTSmowvPle6BTrS/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8986
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXII (Année 1987) . - p. 117-124[article]Réservation
Réserver ce documentA new concept of pretanning without chrome / Marcel Siegler in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXIV (Année 1979)
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Titre : A new concept of pretanning without chrome Type de document : texte imprimé Auteurs : Marcel Siegler, Auteur Année de publication : 1979 Article en page(s) : p. 288-300 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chaux
Croûte (cuir)On entend par "cuir en croûte" des cuirs ayant subi les opérations jusqu'au tannage, à l'exclusion de toute opération de corroyage ou de finissage, mais qui, par opposition aux wet-blue ont été séchés.
Cuirs et peaux -- Propriétés physiques
Fleur du cuir
Prétannage sans chrome
Refente sur chaux
Stratigraphie
Température de retraitIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The manufacture of grain and split leather is simplified by pretanning cattle hides, either after bating or during pickling, with a chromium-free tanning agent until the shrinkage temperature reaches between 170° and 185°F. The pretanned hide is then split to provide a grain and a split intermediate, then these components are shaved and tanned. The entire hide treatment sequence can be effected in two stages : first, beaming, lime fleshing (if necessary), bating, and pretanning before or during pickling ; second, wringing, splitting, sorting, and shaving. The tanning is done after shaving in the the second stage and is followed by coloring and fatliquoring. The resulting chrome-tanned leather has very good physical properties, good fullness, and produces a higher area yield.
The pretanned splits can be sorted and shaved for different types of leather, such as vegetable tan, chrome-vegetable tan, etc., and thus be increased in their value.
The shavings contain no chromium and very littls salt. Hence they have many moreuses, or they can be disposed of by dumping without significant environmental impact.
Much less chrome is needed to tan the leather because the tanning chemicals are used only on the shaved weight. Also, there is less spent chrome to be recycled and reused. The spent liquor can be used either as the float for a new batch of grains or for tanning the splits.Note de contenu : - Table 1 : Shrinkage temperatures at various stages of pretanning process
- Table 2 : Take-up of the pretanning product with time of tanning
- Table 3 : Chrome distribution by stratigraphic test regular tanning process - Split in blue versus seton special process (SSP)
- Table 4 : Comparison of the physical properties of crust leathers derived from hides processed by lime splitting,blue splitting, and the SSP pretanning process
- SSP pretanning procedure on regular delimed stock
- SSP pretanning procedure on completely delimed stock
- Tanning procedure for the grains
- Physical properties of SSP leathersEn ligne : https://drive.google.com/file/d/1ww_q_dWcvIGk6Usu7pBqWdiTGV_Undii/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37222
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXIV (Année 1979) . - p. 288-300[article]A new enzyme process for improved yield and softer leather technical note / Mihai Deselnicu in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIX, N° 11 (11/1994)
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Titre : A new enzyme process for improved yield and softer leather technical note Type de document : texte imprimé Auteurs : Mihai Deselnicu, Auteur ; Victoria Bratulesco, Auteur ; Marcel Siegler, Auteur ; Andrei Anghel, Auteur Année de publication : 1994 Article en page(s) : p. 352-356 Langues : Américain (ame) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The main purpose of bating is to remove the noncollagenous proteins to make the leather softer with greater stretch. Failure to remove the noncollagenous proteins causes a cementing together of the fibres when the leather is dried and results in firmness and lack of flexibility. It is weel known that the classical bating process in the alkaline condition makes use of proteolytic enzymes, which are of pancreatic or baterial origin, and the efficient/activity of the process depends on the enzyme concentration as well as temperature, pH, and time during the bating process. Therefore, the enzyme treatment in alkaline conditions is considered a very sensitive process.
A new development in this field is the use of the enzyme, pepsin, which is extracted from bovine or porcine stomach mucous and is active in acid condition.Treatment with this enzyme under acid conditions may be done after the pickle process or after the chrome tanning.The treatment is safer and has a more selective action than the classical bating under alkaline conditions.By treating the shaved wet blue hides with the acidic enzyme not only are the advantages of improved yield and softer leather achieved, but uniformity of quality and physical properties are also achieved.En ligne : https://drive.google.com/file/d/1whd94jRnEAhyTxxUplbz94PRs0GkrAMv/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8041
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXIX, N° 11 (11/1994) . - p. 352-356[article]Réservation
Réserver ce documentNew evolution in the manufacture of side leather / Marcel Siegler in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXIX (Année 1974)
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Titre : New evolution in the manufacture of side leather Type de document : texte imprimé Auteurs : Marcel Siegler, Auteur Année de publication : 1974 Article en page(s) : p. 28-43 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chaulage
ConfitageLe confitage est une action biochimique effectuée au moyen de produits enzymatiques, qui a pour but de dégrader les fibres élastiques, contribuant ainsi à augmenter la souplesse du cuir. En outre, les enzymes complètent la dégradation des résidus épidermiques, donnant ainsi une fleur plus propre et plus lisse.
Cuirs et peaux
Epilage
Evaluation
PicklageLe picklage consiste à faire absorber à la peau en tripe une quantité importante d'acide, en présence de sel neutre (NaCl) pour réprimer le gonflement que provoquerait l'acidité du milieu.
TannageIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The continuous development of leather substitutes, including poromerics and coated fabrics, the increased price of hides, greater quantities of shoe imports, and, finally, the considerably higher cost of U.S. labor have forced American tanners to re-evaluate completely their tannery concepts. Today, to be competitive with European and other foreign tanneries, South American, for instance, we must have modern processes providing higher productivity and better leather quality.
Therefore, most of the larger tanneries are now involved in rationalizing their production, and in simplifying and modernizing their processes. Some years ago, a two-day beamhouse lime split process, followed by a bate-pickle-and-chrome-tan run in drums, over a period of 15 to 17 hours, would be considered a classical procedure. In the meantime, however, almost all tanneries have attempted to shorten their processes and at the same time change their system to blue splitting.Note de contenu : - Rapid unhairing processes
- Evaluation of test unhaired leathers
- Deliming and bating process
- Pickling and tanning process
- Table 1 : Rapid unhairing procedure lime-free
- Table 2 : Rapid unhairing procedure no soaking and lime-free
- Table 3 : Pilot-plant tests unhairing process : Na2s free
- Table 5 : Pickling and tanning process-Nonswelling pickle acid NaCl and H2SO freePermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38876
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXIX (Année 1974) . - p. 28-43[article]Practical leather processes using the novel pretan concept / William C. Prentiss in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. XXVII (Année 1982)
PermalinkPratical results obtained by pretanning without chrome / Marcel Siegler in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXVI (Année 1981)
PermalinkTannery-scale evaluation of hide preservation by sulfite acetic acid applied in a drum and a hide processor / William J. Hopkins in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXVI (Année 1981)
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