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JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) / Union internationale des sociétés de techniciens et chimistes des industries du cuir . Vol. 59Mention de date : Année 1975Paru le : 01/12/1975 |
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Ajouter le résultat dans votre panierThe chemistry of zirconium tannage / A. L. Hock in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59 (Année 1975)
[article]
Titre : The chemistry of zirconium tannage Type de document : texte imprimé Auteurs : A. L. Hock, Auteur Année de publication : 1975 Article en page(s) : p. 181-188 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Tannage au zirconium
Tannage minéralTannage dans lequel interviennent différents minéraux. Le plus répandu est le tannage aux sels de chrome, mais aussi à l’aluminiumIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Zirconium tannage, i.e. the mechanism by which zirconium-containing ions present in acid aqueous tanning solutions of varying compositions and complexity react at pH values ranging from about 1 to 3 to form the pattern of cross-linkages which imparts to skins the properties associated with leather, is still far from being elucidated.
One underlying reason is undoubtedly the present imperfect knowledge of the structure of collagen fibres themselves. The fibrils appear to consist of twined triple units of polypeptide chains of differing lengths, the repeating pattern of amino acid residues, joined together by peptide links being based roughly one-third on glycine, one-third on alanine plus other amino acids, and one-third on imino acids comprising about equal parts of proline and hydroxy-proline.
The links which join the polypeptide chains together to form the triple chain structures are mostly hydrogen bonds, but there may also be some covalent bonds of the aldol type which are derived from the basic amino acid lysine in adjacent chains. It has also been shown that collagen chains have primary structures containing more amorphous regions, rich in polar amino acid residues (with acidic and basis ionising properties) and more crystalline regions rich in imino acid and non-polar amino acid residues.
However, the present lack of a generally accepted explanation of zirconium tannage chemistry seems to be due at least as much to want of knowledge concerning the structure of the dissolved zirconium with which collagen combines at the moment that the tanning reaction takes place. This applies to published laboratory investigation of tannage chemistry as well as to conclusions based on more practical tannage.
The complexity of aqueous zirconium chemistry, particularly that of the sulphate salts which prevail in the leather industry, has long been recognised. Attempts to rationalise the often conflicting published information were made before 1960, notably by Blumenthall, but it is fair to say that true appreciation of the complex structure of zirconium ions-and therefore their likely bonding characteristics-only began to be possible within the last 15 years or so.
Better understanding of aqueous zirconium chemistry has corresponded with higher consumption of zirconium compounds by various industries and increased interest in the mechanisms of the reactions involved. Much of the published work has been done in USA and USSR. It was, of course, not available to the Somerville school, Lassère, Reed and co-workers, and others who pioneered zirconium tannage and have sought to explain its chemistry.
The hydrolytic and polymerisation reactions of zirconium cations which take place spontaneously, or can be promoted, in zirconium oxychloride solutions and their effects on the structure of these ions were discussed by Clearfiels about ten years ago. He also speculated on the structure of zirconium ions in sulphate solutions. Zirconium oxychloride solutions have been recently investigated more fully by Rijnten. The aqueous chemistry of zirconium and the bonding between hydrous zirconium oxide and other substances in industries other than leather tannage were reviewed in 1974.Note de contenu : - Structure of zirconium ions
- Review of theories of zirconium tannage
- General comment
- Older comment
- Recent comment
- Ranganathan and reed
- Williams-wynn
- Babich and shapilskayaEn ligne : https://drive.google.com/file/d/1-9PtSYX_dNeYvKlQ2YH8KP5DaIl2_uD6/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20428
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 59 (Année 1975) . - p. 181-188[article]Salt-pH effects on collagen thermal stability in pickling and curing / A. E. Russel in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59 (Année 1975)
[article]
Titre : Salt-pH effects on collagen thermal stability in pickling and curing Type de document : texte imprimé Auteurs : A. E. Russel, Auteur Année de publication : 1975 Article en page(s) : p. 6-13 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bases (chimie)
Collagène
Halogénures
pH
Stabilité thermique
SulfatesLe sulfate est le sel de l'acide sulfurique H2SO4. La formule de l'ion sulfate est SO42-.Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Effects of alkali halides and sulphates on thermal stability of insoluble and precipitated fibrous collagens have been examined in the acid-to-neutral pH range. The salt-pH levels studied corresponded to the range of conditions encountered from acid pickling to saturated brine curing. Fluoride and chloride salts stabilised collagen whereas the bromides and iodides tented to stabilise at low concentrations in acid solution only, but were structural destabilisers at high concentration. Halide effects were strongly pH-dependent and a feature of the results was the relatively small increase in collagen stability in saturated sodium chloride at neutral pH (curing conditions) compared with the large stability increase found at saturation at acid pH. Alkali sulphates on the other hand, stabilised fibrous collagen substantially at all pH levels. Assuming that an increase in heat stability of collagen is also correlated with incresed resistance to bacterial attack, the results suggest that curing in acidified brine offers additional protection. In addition, salt concentration in acid medium can be substantially decreased without affecting the excess stability in collagen. Practical implications of these results are discussed with reference to the problem of salt reduction in curing and the use of sulphates as penetration assistants in Mimosa cure and rapid vegetable tannage. Note de contenu : - EXPERIMENTAL : Materials - Measurement of thermal stability
- DISCUSSION : Salt-pH interactions in curing and pickling - Dry salt curing - Drum brining - Alkali sulphate effects on collagen stabilityEn ligne : https://drive.google.com/file/d/18d5da53f-G1PlxshtuMMV7m-aC4L1LqN/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31041
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 59 (Année 1975) . - p. 6-13[article]Mould growth on pickled pelt / J. C. Glover in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59 (Année 1975)
[article]
Titre : Mould growth on pickled pelt Type de document : texte imprimé Auteurs : J. C. Glover, Auteur ; I. R. Hughes, Auteur ; G. W. Vivian, Auteur Année de publication : 1975 Article en page(s) : p. 74-78 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Acides
Antifongiques
Champignons microscopiques
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.
Plan d'expérience
SelsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Factorial experiments have been used to study some factors affecting mould growth on pickled pelt. Increasing acid and salt levels in pickle were found to inhibit mould growth and pressing, to reduce moisture content, to encourage it. Nineteen fungicides have been tested and a screening criterion established. Fungicides meeting this criterion are listed as effective agents for preventing mould growth on pickled pelts. Note de contenu : - EXPERIMENTAL DESIGN
- RESULTS : Effect of pressing - Effects of acid and salt - Effects of fungicides - Effect of fungicides on tannages
- DISCUSSION : Effect of pressing - Effects of acid and salt levels - Effect of fungicideEn ligne : https://drive.google.com/file/d/1QBx7qeoOpWPoNu52yDghI_FmtfoRqKfs/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31833
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 59 (Année 1975) . - p. 74-78[article]Studies on further structural stabilisation of the chrome-collagen compound / T. Ramaswamy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59 (Année 1975)
[article]
Titre : Studies on further structural stabilisation of the chrome-collagen compound Type de document : texte imprimé Auteurs : T. Ramaswamy, Auteur ; D. Ramaswamy, Auteur Année de publication : 1975 Article en page(s) : p. 149-153 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Collagène -- Stabilité
Complexes métalliques
Résistance à la transpiration
Résistance thermique
Stabilité chimique
Tannage au chromeIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The factors causing detannage and stripping of chrome from chrome tanned collagen in the presence of sweat and heat have been outlined. Different methods of further stabilisation of the chrome-collagen compound have been discussed. Stabilisation through ligands which can form Mannich-type linkages has been assessed for heat and sweat resistance, and evidence for the participation of e-lysine groups of collagen in stabilisation has been obtained. Note de contenu : - EXPERIMENTAL : Complex formation with Cr3+ and dinuclear Cr2(OH)24+ species
- RESULTS AND DISCUSSION : Role of protein groups in the stabilisation of chrome collagen complexEn ligne : https://drive.google.com/file/d/1RCABT6nNjmbirYgewOWVu1285zeG-ljI/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31837
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 59 (Année 1975) . - p. 149-153[article]Comparison of leather produced from fresh and salted hides / Betty M. Haines in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59 (Année 1975)
[article]
Titre : Comparison of leather produced from fresh and salted hides Type de document : texte imprimé Auteurs : Betty M. Haines, Auteur Année de publication : 1975 Article en page(s) : p. 161-171 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuir
Echantillonnage
Etudes comparatives
Mesure
Peaux brutes
Rendement en surfaceTags : 'Peaux fraiches' salées' Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The introduction of stringent effluent regulations is encouraging a change from traditional curing methods to the processing of fresh hides. The question then arises as to the quality of the leather and the area yield obtainable from fresh hides compared with salted. This comparison was made in three separate trials using 100 fresh and 100 wet salted hides in each trial. Data such as weight, thickness and area of the raw hides was recorded. A proportion of the hides were examined at stages through the processing, and the final leathers were subjected to physical tests.
Apart from a slightly coarser break in the leathers produced from the fresh hides, no consistent differences in handle or physical properties relating to the curing methods could be found in the leathers.
When the yield of leather was estimated on a weight basis either tail or green fleshed weight, no statistically significant difference in yield was found between the two curing methods.
As the raw hides of the same weight differed considerably in area and thickness, a more precise basis for calculation of yield is one based on area. This was calculated for 50 hides in each of the three packs. Overall no statistically significant difference in yield was found relating to the curing methods.
From this work we have concluded that there is no consistent difference between fresh and salted hides with regard to the yield and quality of leather produced from them.Note de contenu : - EXPERIMENTAL PLAN : Processing - Measurements made - Sampling for laboratory investigation
- RESULTS : Variation in the raw material - Area yield - Leather quality
- DISCUSSION : Variations in raw material - Area yield - Processing - Leather quality - Microscopical observationsEn ligne : https://drive.google.com/file/d/1NvhT8uz8VDV5OLNZO5mF4cpG2UU4iGPL/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31838
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 59 (Année 1975) . - p. 161-171[article]The viscoelastic properties of leather and poromerics / R. E. Whittaker in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59 (Année 1975)
[article]
Titre : The viscoelastic properties of leather and poromerics Type de document : texte imprimé Auteurs : R. E. Whittaker, Auteur Année de publication : 1975 Article en page(s) : p. 172-180 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés mécaniques
ViscoélasticitéIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The viscoelastic properties obtained from tensile stress-strain curves on leather and a number of poromerics are compared. It is found that a unique correlation exists for all shoe upper materials between the energy input to a stress-strain cycle and the hysteresis in that cycle.
The amount of tension-set at a particular strain for leather is larger than for the poromerics and this gives leather an enhanced comfort property. The paper shows how this initial set is related to the amount of stress softening (difference between first and subsequent extension curves) in the material. The change of tension set with time of recovery, after extension to a particular strain, is shown to be similar for leather and poromerics.Note de contenu : - Stress-strain properties
- Energy measurements
- Stress softening
- Tension setEn ligne : https://drive.google.com/file/d/1jPADSPTY5-SNU-6jR_5P9svMruDo7w2M/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31839
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 59 (Année 1975) . - p. 172-180[article]Method for the determination of zirconium-IUC 13 / A. W. Landmann in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59 (Année 1975)
[article]
Titre : Method for the determination of zirconium-IUC 13 Type de document : texte imprimé Auteurs : A. W. Landmann, Auteur Année de publication : 1975 Article en page(s) : p. 1-2 Langues : Anglais (eng) Catégories : Cuir -- Teneur en zirconium
Cuirs et peaux -- AnalyseIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : A method for determining the total quantity of zirconium in leather is described. It is not possible to define the chemical identity of the zirconium compounds present and results are expressed in terms of the oxide, ZrO2. Note de contenu : - Principle of the method
- Reagents
- Apparatus
- Sampling
- Procedure
- Expression of results
- Notes on procedureEn ligne : https://drive.google.com/file/d/1enLL9O3pPXa-hwrH8B8nVmwHAFjQqHeU/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35296
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 59 (Année 1975) . - p. 1-2[article]Provisional method for the determination of un-neutralised free fatty acid in sulphated oils-SLO 2/17 / E. A. Taylor in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59 (Année 1975)
[article]
Titre : Provisional method for the determination of un-neutralised free fatty acid in sulphated oils-SLO 2/17 Type de document : texte imprimé Auteurs : E. A. Taylor, Auteur Année de publication : 1975 Article en page(s) : p. 29 Langues : Anglais (eng) Catégories : Acides gras
Analyse quantitative (chimie)
Chimie analytique
Huiles sulfatéesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The method determines that portion of free fatty acid present in the oil after sulphation, and which is in excess of the neutralising base. It is thus complementary to method SLO 2/16 which determines the total free fatty acid due to hydrolysis. The method applies particularly to ammonia or amine neutralised sulphated oils which will not titrate by the simple method SLO 2/5. Such samples are often unstable and lose ammonia fairly rapidly on standing. The method determines the un-neutralised free fatty acid at the time of the test and should be repeated if the result is required again later. Note de contenu : - Principle
- Reagents
- Apparatus
- Procedure
- CalculationsEn ligne : https://drive.google.com/file/d/1FVOZqvS6Qms88V1mz5pqMtgdewineS77/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35297
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 59 (Année 1975) . - p. 29[article]A comparison of two tear tests for leather / R. Guy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59 (Année 1975)
[article]
Titre : A comparison of two tear tests for leather Type de document : texte imprimé Auteurs : R. Guy, Auteur ; A.-G. Marriott, Auteur Année de publication : 1975 Article en page(s) : p. 30-40 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés mécaniques
Déchirure (mécanique)
Essais de résilience
Essais dynamiques
Etudes comparativesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : It has long been accepted that high correlation exists between the tearing loads obtained from the Baumann tear test (IUP/8) and tha ALCA test E 10, slightly modified by SATRA and designated PM 30. Recently, however, the tearing energy has been put forward as a better criterion of tear resistance. The work described in this paper has therefore been concerned primarily with comparing various tearing criteria for the two test specimen shapes. It is concluded that the tearing energies obtained from the two tests correlate well with each other, although some semichrome leathers are anomalous. Note de contenu : - INTRODUCTION : A brief review of tear testing - Correlation studies of the tear tests
- EXPERIMENT I : Plan - Parameters measured - Statistical analysis and data processing - Results and discussion - Conclusions for Experiment 1
- THEORETICAL CONSIDERATION
- EXPERIMENT II : Factors varied - Results and discussion
- CONCLUSIONS FOR EXPERIMENT II
- Table 1 : Maximum tearing load (kg)
- Table 3 : Maximum tearing load per unit thickness for the two test methods (kg mm-1)
- Table 4 : Mean tearing loads for the four leathers and test methods (kg)
- Table 5 : Mean tearing load per unit thickness for the two test methods (kg mm-1)
- Table 7 : Mean energies of initiation for the four leathers and two test methods (J x 10 4)
- Table 8 : Total tearing energy per unit distance morved by tearing force, for the two methods and four leathers (kg)
- Table 9 : The maximum tearing load (kg) for the four leathers, two specimen shapes and four sizes of hole terminating the cut
- Table 10 : Maximum tear load (kg) for the two specimen shapes and the four leathers
- Table 11 : The average maximum tearing loads (kg) for the two specimen shapes and four sizes ofhole terminating the cut
- Table 12 : The average maximum tearing loads (kg) for the two sampling locations of the four leathers
- Table 13 : The average mean tearing loads for the four leathers and two basic specimen shapes (kg)
- Table 14 : The average initiation energies of tear (J x 10 4) for the four leathers, two test speciments and four sizes of holes
- Table 15 : The average initiation energies (J x 10 4) of tear for the four sizes of hole and the two specimen shapes
- Table 16 : The regression constants for energy of initiation versus hole size for four leathers and two specimen shapes
- Table 17 : Dependence of energy of initiation on speed of tearing
- Table 18 : The average total tearing energy per unit distance moved by tearing force for the four leathers, two specimen shapes and four hole sizes (Ag + Ap) tearing distance
- Table 19 : The average total tearing energy per unit distance moved by tearing force for the four leathers and two basic specimen shapes
- Appendix 1 : Analysis of variance of the maximum tearing loads
- Appendix 2 : The anlaysis of variance for the ratio of maximum tearing loads (Rg)En ligne : https://drive.google.com/file/d/1AR9VPTxOZaTS_MoSZn3YNZC9bzfXu1wK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35298
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 59 (Année 1975) . - p. 30-40[article]Storage qualities of wet-blue leathers / Alan E. Russell in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59 (Année 1975)
[article]
Titre : Storage qualities of wet-blue leathers Type de document : texte imprimé Auteurs : Alan E. Russell, Auteur ; Desmond R. Cooper, Auteur Année de publication : 1975 Article en page(s) : p. 41-48 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bains de tannage -- Teneur en chrome
Cuirs et peaux -- Analyse
Durée de stockage
pH
Stabilité chimique
Stabilité physique
Température
Wet-blue -- StockageIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The physical and chemical stability of low-chrome wet-blue stock was investigated at various storage pH values, temperatures and times. Chrome contents were varied between 20% and 80% of normal tannage to determine minimum levels required to protect the hide structure from bacterial and hydrolytic damage Behaviour of the leathers under storage was assessed from physical tests on the leathers in the wet condition as well as after fatliquoring and drying and from analysis of the interstitial liquor for free chrome and nitrogen. A feature of the results was the comparative stability of the tanned stock under storage at all levels of chrome content. Shifts in physical properties with chrome content were normal trends, while increases observed in grain extension at crack, slit tear and lastometer loads after storage represented beneficial changes. The low levels of soluble nitrogen and chrome in the leather liquors throughout storage indicated that degradation of the hide structure or breakdown of the chrome complexes in the hide was minimal. The experimental results demonstrate the feasibility of extended storage of wet-blue at extremely low levels of chrome application. Note de contenu : - EXPERIMENTAL DESIGN : Statistical design - Preparation of wet-blue leathers
- RESULTS : A)Changes in leather liquors during storage - B) Examination of leathers in the wet condition - C) Examination of finished leathers
- Summary of significant changes in physical tests
- Table 1 : Chrome content of liquors (ppm) AB x C chrome offered x initial pH (***)
- Table 2 : Change in liquor chrome content (ppm) AB x D chrome offered x storage temperature (**)
- Table 3 : Property : Shrink. Temp. Change on drying. Unit : Degree cent ABC chrome offered x storage pH (**)
- Table 4 : Property : Load at break (wet leathers). Unit : MPa ABE chrome offered x storage time (**)
- Fig. 1 : Variation in chrome content of wet-blue leathers with chrome offered
- Fig. 2 : Variation in shrinkage temperature of wet-blue leathers with amount of chrome offered
- Fig. 3 : Variation of shrinkage temperature of wet-blue leathers with chrome content
En ligne : https://drive.google.com/file/d/1bmEsGz0HXovXZcRO8GbJKanKUvNQ_Kpl/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35299
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 59 (Année 1975) . - p. 41-48[article]Somes notes on the analysis of pickled skins / A. Vos in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 59 (Année 1975)
[article]
Titre : Somes notes on the analysis of pickled skins Type de document : texte imprimé Auteurs : A. Vos, Auteur Année de publication : 1975 Article en page(s) : p. 112-113 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Analyse
Cuirs et peaux -- Teneurs en acides
Cuirs et peaux -- Teneurs en chlorure de sodium
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.
Solutions (chimie)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : With regard to the analysis of pickled skins it is suggested to determine the acid content by means of an extraction with a 4% pyridine solution and the salt content by a calculation from the sulphated ash. Note de contenu : - LITERATURE : Acid - Sodium chrloride - Hydrogen ions - Chloride ions - Acid - Salt
- EXPERIMENTAL
- Table 1 : mEq/g hide substanceEn ligne : https://drive.google.com/file/d/1DXe_LlMoLH4MUPwse_AMgPbruw8vKfmO/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35300
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 59 (Année 1975) . - p. 112-113[article]