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Mention de date : 01-02/1980
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Low-salt antiseptic curing studies / A. E. Russel in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 64, N° 1 (01-02/1980)
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Titre : Low-salt antiseptic curing studies Type de document : texte imprimé Auteurs : A. E. Russel, Auteur ; A. C. Galloway, Auteur Année de publication : 1980 Article en page(s) : p. 1-8 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antiseptiques
Chlorure de sodiumLe chlorure de sodium est un composé chimique de formule NaCl. On l'appelle plus communément sel de table ou de cuisine, ou tout simplement sel dans le langage courant. C'est le principal produit dissous dans l'eau de mer ; on l'appelle alors sel marin.
On l'obtient : dans des marais salants par évaporation de l'eau de mer, dans des mines, par extraction du sel gemme (halite) ou en le synthétisant lors de réactions à hautes températures entre du dichlore (Cl2) et du sodium métallique (Na).
Le chlorure de sodium est utilisé dans l'industrie chimique pour produire du chlore, de la soude caustique et de l’hydrogène.
Coût
Cuirs et peaux -- Conservation
Cuirs et peaux -- Industrie -- Aspect de l'environnement
Industrie -- Pollution -- Lutte contreIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Strategies adopted to counter pollution problems confronting the leather industy may be categorised generally under three headings. Note de contenu : - Salt component in curing
- Role of salt in curing
- Water activity and bacterial growth
- A. Laboratory studies on hide cutting
- Small-scale field trials
- Further field trials
- Salt components in proposed low-salt cure
- Salt utilisation in curing at various levels of salt offered
- Costing of low-salt-antiseptic preservation
- Table 1 : Pollution control-the three R's
- Table 2 : Salt components in curing
- Table 3 : Relation between the concentration
- Table 4 : Limiting water activities for growth of some bacteria
- Table 5 : Effect of salt concentration and soluble protein on bacterial count at 20°C
- Table 6 : Maximum stable storage periods (in days) observed for green hide cuttings dip-treated in antiseptic salt solutions followed by moist storage in polythene envelopes at 26°C
- Table 7 : Ash and moisture analysis on treated green hide pieces after 20h dip treatment in various antiseptic salt solutions
- Table 8 : Ratio of treated, drained weight to green weight of hide cuttings in various antiseptic-salot treatments
- Table 9 : Field trials on hide preservation using antiseptic-salt mixtures
- Table 10 : Field trials on hide preservation using antiseptic-salt-mixtures
- Table 11 : Periods of stable storage of hide cuttings from trial 3 treatments based on hair-slip and staling in moist incubation at 26°C
- Table 12 : Salt components in proposed low-salt cure
- Table 13 : Salt utilisation in curing at various levels of salt offeredEn ligne : https://drive.google.com/file/d/10hugwZZ6lPg8UQ983_BfBMyoA9C_kWTd/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34131
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 64, N° 1 (01-02/1980) . - p. 1-8[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007125 - Périodique Bibliothèque principale Documentaires Disponible Hide and leather characteristics of young afrikaner-type steers slaughtered at four different live masses / Alan E. Russell in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 64, N° 1 (01-02/1980)
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Titre : Hide and leather characteristics of young afrikaner-type steers slaughtered at four different live masses Type de document : texte imprimé Auteurs : Alan E. Russell, Auteur ; A. C. Galloway, Auteur ; R. T. Naudé, Auteur ; Anne-Dorothée Argo, Auteur ; H. J. Venter, Auteur Année de publication : 1980 Article en page(s) : p. 9-15 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Animaux -- Alimentation
Cuirs et peaux -- Analyse
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux de bovins
StatistiquesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Hide characteristics and leather properties have been examined in hides obtained from young, crossbred Afrikaner-type steers of varying carcase mass. For this purpose, certain animais were fed ad lib. on a concentrate ration while the feed intake of others was restricted, in order to attain various prescribed masses. The experimental animals included three breed types and four carcase-mass groups in which resulting hide and leather qualifies could be examined and compared. Green hide mass in relation to carcase mass decreased sharply after weaning in animals maintained on a low nutritional plane in contrast with animals growing rapidly where relative hide mass increased with live mass gain. Leather area yield in relation to green hide mass tended to remain unchanged in the nutritionally restricted group after weaning, but decreased progressively in full fed animals due to the relatively rapid increase in hide thickness compared with hide area as live mass increased. Upper leather physical tests on the resulting full-grain leathers showed a general marked inflection point in the nutritionally restricted group of animals. Thus, leather extensibility, tensile strength and suit tear force tended to be substantially higher in this group and decreased progressively with increasing live mass in other groups. The significance of these changes in leather properties is discussed in relation to the interruption in the normal growth pattern in the experimental animals. Note de contenu : - EXPERIMENTAL : Statistical plan - Factors varied - Conditions of rearing - a. Yield measurements - b. Leather physical tests
- RESULTS AND DISCUSSION : Hide yield (green hide mass-carcase mass ratio - Leather yield (leather area-green hide mass ratio) - Leather tensile properties - Still tear force - Lastometer testsEn ligne : https://drive.google.com/file/d/1RZM7aNbeu7K5BgRELJoNDYFhjNVx5NMd/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34132
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 64, N° 1 (01-02/1980) . - p. 9-15[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007125 - Périodique Bibliothèque principale Documentaires Disponible Some thoughts on standardisation of synthetic tanning materials / Samir Das Gupta in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 64, N° 1 (01-02/1980)
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Titre : Some thoughts on standardisation of synthetic tanning materials Type de document : texte imprimé Auteurs : Samir Das Gupta, Auteur Année de publication : 1980 Article en page(s) : p. 16-23 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux
Syntans
Tannage synthétiqueIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Syntans are in general condensation products of aromatic substances (cresol, phenol, naphthol and naphthalene), formaldehyde and sulphuric acid. There are, however, many variations in the ingredients, the relative quantities used and the technique of production. The chemistry of syntans is extensively discussed and evaluated by Otto, Kuntzel and Gustavson. In general, the bigger the molecules of the tan and the higher the proportion of secondary valencies it possesses relative to sulphonic groups, the fuller the leather it will produce. The secondary valencies are a function of the dipole moments and phenolic OH groups in the molecule and can lead to H-bonds on the protein structure. On the other hand the presence of highly ionised sulphonic groups in the mole-cule can inhibit this effect. By carefully manipulating these two main factors, the final leather-forming character of the syntan is obtained. In fact innumerable opportunities exist for the manufacture of syntan having varying product characteristics.
Resin tanning materials on the other hand are either condensation products of aminoplasts like urea, melamine–formaldehyde, dicyandiamide–formaldehyde, or copolymers of styrene–maleic anhydride or polyamide or polymerisation products of acrylic monomers. Mostly they are used as retanning agents. The point worth considering is whether such a big range, presently manufactured by each manufacturer, is absolutely required by a tanner. An attempt has therefore been made in this paper to analyse the reasons for such a wide range of syntans and to suggest an approach for standardisation of these synthetic tanning materials.Note de contenu : - Why so many syntans ?
- Historical development of syntans
- Classifications and grouping of synthetic tanning materials
- Parameters for specification : Identification - Parameters
- Proposed specifications : Auxiliary syntans - General - Neutral levelling and dispersing syntans - Chrome syntans - Resin tanning materials - Aldehydes and miscellaneous products
- Table 1 : Requirements for auxiliary syntans
- Table 2 : Requirements for replacement syntans
- Table 3 : Requirements for levelling syntans
- Table 4 : Requirements for chrome syntans
- Table 5a : Requirements for resins, type 1
- Table 5b : Requirements for resins, type 2
- table 5c : Requirements for resisn, type 4
- Table 5d : Requirements for resins, type 3En ligne : https://drive.google.com/file/d/18aqlzuS9tJrnABGD_TwYd4BR4zd3Ew6k/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34133
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 64, N° 1 (01-02/1980) . - p. 16-23[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007125 - Périodique Bibliothèque principale Documentaires Disponible
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