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Within and between skin variation of physical properties in bovine leather / A. W. Landmann in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 63, N° 3 (05-06/1979)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 63, N° 3 (05-06/1979) . - p. 45-48 Titre : Within and between skin variation of physical properties in bovine leather Type de document : texte imprimé Auteurs : A. W. Landmann, Auteur Année de publication : 1979 Article en page(s) : p. 45-48 Note générale : Glossaire Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés physiques Cuirs et peaux de bovins Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : There is an increasing interest in selling and buying leather to specification and in within tannery quality control. Fundamental to this problem is a knowledge of within and between skin variability. American workers have published a series of papers dealing with the variability of varions sampling locations with the objective of choosing the most representative area (giving results most nearly to the mean). The experiments generated a great deal of information, of which it was unfortunately only possible to publish a summary. A more recent paper by van Vlimmeren brings this information more up to date but again average values for each location are quoted. This enables a correction for mean value of the total area from the results at a sampling location. Mean values can however be only an indication of performance; more important is the percentage area under a given limit if in order to make a shoe, the leather must have a tear strength of 5 kg, it is little use saying that the mean value is 5.5 kg. This could mean that 40 % of the population could well be below the required limit. It is therefore important to know something of the type of distribution or it would require a very large sample to ensure that if there is any significant proportion in the pack below the limit that one or more of these is actually present in the sample which is taken. Lollar4 showed that in a pack of 350 hide samples at the britch that the distribution of stich tear results was approximately "normal" in distribution, and there was the suggestion that other properties might be similarly distributed. Note de contenu : - Current basis of sampling - The quantitative approach - The combination of within skin variation and between skin variation and its effect on specification En ligne : https://drive.google.com/file/d/1l-Z7or4jsQ5VYBHXYiXN7egN3sBO9KuB/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31885 [article]

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Amino resins for leather / Samir Das Gupta in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 63, N° 3 (05-06/1979)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 63, N° 3 (05-06/1979) . - p. 49-54 Titre : Amino resins for leather Type de document : texte imprimé Auteurs : Samir Das Gupta, Auteur Année de publication : 1979 Article en page(s) : p. 49-54 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir Polyamines Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Amino resins are mainly obtained by the condensation of urea, thio-urea, melamine, dicyandiamide either as single amino base or in mixture of two or more of these with formaldehyde or other lower aliphatic aldehydes. They are either anionic or cationic and are mostly used as retanning agents. Some of them may, however, beused as a solo-tanning agent, particularly for in situ tannage of white leathe or as a pretanning agent. Note de contenu : - Technique of production - Mechanism of reaction and effect on leather - Effect on physical properties of leather : Full-chrome side leather - Corrected grain side leather - Retanned sheep skins - Vegetable-tanned EI sheepskins - Effect on dyeing properties of leather En ligne : https://drive.google.com/file/d/10oWOYRUyVnGqZsmsPDkEGU6M1Asb4_gX/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31891 [article]

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Microbiology in leather manufacture - a review / R. A. Venkatesan in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 63, N° 3 (05-06/1979)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 63, N° 3 (05-06/1979) . - p. 55-60 Titre : Microbiology in leather manufacture - a review Type de document : texte imprimé Auteurs : R. A. Venkatesan, Auteur Année de publication : 1979 Article en page(s) : p. 55-60 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Microbiologie Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : It is well known that hides and skins, the raw material for leather manufacture either as finished leather and/or as finished goods, earn a major percentage of foreign exchange to boost the Indian economy. The raw hide or skin if not property preserved is likely to undergo deterioration due to microorganisms. Of late it has also become the concern of river authorities in many countries to reduce the level of dissolved solids such as salts in trade effluent. For this reason several investigators have made attempts both for the short and long-term preservation of hides and skins using biocides instead of salts. Such a method is likely to be more efficient since it interferes with the metabolism of bacteria and also may be more reliable than the conventional salt cure. Several investigators have also worked on improving the conventional methods of curing hides and skins and also on their associated problems such as surface defects related to bacterial degradation. The hide processor or the tanner must become well acquainted with such valuable information and scientific knowledge in order to produce a quality leather and to increase exports by delivering improved quality goods. With this in view an attempt has been made to compile the information available in the literature as regards the microbiology of leather manufacture. Note de contenu : - BACTERIA AND THEIR EFFECT ON HIDES AND SKINS : Chemical composition of hides and skins - Mechanism of bacterial action - Mode of penetration of bacteria into skin - Putrefactive damage - BACTERIA ASSOCIATED WITH FRESH HIDE OR SKIN - MICROBIOLOGY OF CURING OF HIDES AND SKINS : Red heat - Salt stippen - Salt stains - BACTERIA ASSOCIATED WITH THE SALTED HIDE OR SKIN - MICROBIOLOGY DURING PROCESSING OF HIDES AND SKINS : Soaking - Liming - Pickling - Bating - Tanning En ligne : https://drive.google.com/file/d/1hzg-RCIKKXOW-bUZ0xizEDeC7SxM6ymE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31895 [article]

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