Dépouillements

Determination of bacterial growth rates and their practical significance / Desmond R. Cooper in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 58 (Année 1974)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 58 (Année 1974) . - p. 25-31 Titre : Determination of bacterial growth rates and their practical significance Type de document : texte imprimé Auteurs : Desmond R. Cooper, Auteur ; A. C. Galloway, Auteur ; D. R. Woods, Auteur Année de publication : 1974 Article en page(s) : p. 25-31 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bactéries -- Croissance Biodégradation Collagène -- Détérioration Cuirs et peaux Peaux brutes Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The growth rates of mixed population of hide bacteria and of pure strains of collagenolytic and non-collagenolytic bacteria have been determinated to show the practical significance of high growth rates in delayed curing and in cured hides. Most of the hide bacteria studied have mean generation times of less than 4 h, which means that under exponential growth rate conditions these bacteria double their number in less than 4 h. This fact and the rate of collagen decomposition by the collagenolytic bacteria can have a significant effect in commercial curing. En ligne : https://drive.google.com/file/d/12bcWOckvbIpPkazWB6l31BTIMggpuf9O/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20429 [article]

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The XVth procter memorial lecture fact or fiction ? How much do we really know about the chemistry of chromium today ? / H. M. N. H. Irving in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 58 (Année 1974)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 58 (Année 1974) . - p. 51-62 Titre : The XVth procter memorial lecture fact or fiction ? How much do we really know about the chemistry of chromium today ? Type de document : texte imprimé Auteurs : H. M. N. H. Irving, Auteur Année de publication : 1974 Article en page(s) : p. 51-62 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Tannage au chrome Index. décimale : 675.2 Préparation du cuir naturel. Tannage En ligne : https://drive.google.com/file/d/1XU5fR0FEqWkn_ygzm87ybpeM10ywSQO1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20430 [article]

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Fungicides for treating wet blue hides / A. C. Galloway in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 58 (Année 1974)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 58 (Année 1974) . - p. 67-71 Titre : Fungicides for treating wet blue hides Type de document : texte imprimé Auteurs : A. C. Galloway, Auteur ; Desmond R. Cooper, Auteur Année de publication : 1974 Article en page(s) : p. 67-71 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Antifongiques Antimicrobiens Wet-blue (tannage) Peau tannée au chrome (le chrome donne une couleur bleue) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Sodium pentachlorophenate, pentachlorophenol, cresylic acid, beta naphthol and the proprietary products Busan 31, Busan 52, Busan 72, MTC 10 and Preventol have been tested at various concentration levels, added at different stages of processing, for the prevention of natural fungal growth on stored wet blue hides. Sodium pentachlorophenate, pentachlorophenol, cresylic acid and beta naphthol were not very effective in preventing fungal growth for the periods required for overseas delivery of wet blue hides, but could possibly be used at suitable concentrations for the internal short-term holding of wet blue stock in tanneries. The best overall results were obtained with Busan 72 which appeared effective in tannery trials even at concentrations below 0,025% of active ingredient. En ligne : https://drive.google.com/file/d/1OUwr-WS1kuFQS5De0mmxpcUZs_dM7Vax/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20431 [article]

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Studies on the source of contamination of hides by collagenolytic bacteria / D. E. Rawlings in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 58 (Année 1974)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 58 (Année 1974) . - p. 32-34 Titre : Studies on the source of contamination of hides by collagenolytic bacteria Type de document : texte imprimé Auteurs : D. E. Rawlings, Auteur ; D. R. Woods, Auteur ; Desmond R. Cooper, Auteur Année de publication : 1974 Article en page(s) : p. 32-34 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bactéries Bactéries -- Comptage Collagène -- Détérioration Contamination microbienne Cuirs et peaux -- Analyse Cuirs et peaux de bovins Cuirs et peaux de veaux Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The source of collagenolytic bacteria responsible for the degradation of collagen in hides, which results in leather decay, has been investigated. The numbers and collagenolytic activities of the hide bacteria were determined immediately after droping the animals and at various stages at both the abattoir and curing shed, prior to the addition of salt. The results indicated that the contamination of hides by collagenolytic bacteria, which cause leather decay, occurred on the living animal and not in the antiseptic abattoir and curing shed. These results emphasise the importance of avoiding delayed curing as the collagenolytic bacteria are already present in the hide and must be inhibited or destroyed as soon as possible. Note de contenu : - METHODS : Materials - Viable bacterial counts - Screening for collagenolytic activity - RESULTS : Viable counts of calf skin and cattle hide bacterial populations - Collagenolytic activities of calf skin and cattle hide bacterial populations - Table 1 : Counts and collagenolytic activity of calf skin bacteria immediately after dropping the animal - Table 2 : Counts and collagenolytic activity of calf skin bacteria after removal of the skin from the carcass - Table 3 : Counts and collagenolytic activity of cattle hide bacteria immediately after dropping the animal - Table 4 : Counts and collagenolytic activity of cattle hide bacteria on arrival at curing shed - Table 5 : Counts and collagenolytic activity of cattle hide bacteria after washing at the curing sheds En ligne : https://drive.google.com/file/d/11wJKIGHuljhO1srquprDyoLcGFYt0KMg/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32204 [article]

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Lime speck / Mary Dempsey in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 58 (Année 1974)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 58 (Année 1974) . - p. 12-15 Titre : Lime speck Type de document : texte imprimé Auteurs : Mary Dempsey, Auteur ; I. R. Hughes, Auteur Année de publication : 1974 Article en page(s) : p. 12-15 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chaulage Chaux Cuirs et peaux Taches Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Lime speck, which is first clearly recognised in the pickled pelt as white spots or areas, was experimentally shown to originate in the painted skin According to X-ray analysis and microscopical examination the defect is due to gypsum (CaS042H20) within the grain layer. While painted skin piled for one day before pulling remained clear, skin piled for three days or four days developed speck. The effect was aggravated at raised temperature and by drying, though skin which was still moist at the end of piling could also become speckled. X-ray analysis of limed, bated, and pickled pelts showed that calcium carbonate (in the form of calcite) was the precursor in the limed pelt of speck in the pickled. Nevertheless, calcium carbonate present as calcite in the lime used for the paint did not affect the incidence of speck. It appears that calcite as precursor is formed in situ and, so long as sufficient calcium ions and carbon dioxide are available, will form if, during piling, water is extracted from the system by the collagen fibres (tending to plump under the alkaline conditions) or by the fleece (competing with the pelt for water) or by evaporative drying. The small amount of calcite found in the clear limed pelt appeared to have been directly transformed into gypsum in the clear pickled pelt, but an intermediate, vaterite—another form of calcium carbonate—occurred in the affected bated pelt: its role in the transformation to gypsum is not understood. The practical implications of the work are: duration of piling should be kept short, skins should be piled cool and in a cool place, conditions encouraging skins to heat in pile and conditions that could allow evaporative drying to start should be avoided. Note de contenu : - EXPERIMENT I : The effect of drying and duration in pile - X-ray diffusion analysis - Results - EXPERIMENT II : The effect of composition of the lime used, duration and temperature in pile, and position of the pelt in pile - Results - Table 1 : Composition of lime (Exp. II) - Table 2 : Effect on duration and temperature on incidence of speck - Fig. 1 : Section through grain of speckled pelt, where the spots were discrete. Photographed between partially - Fig. 2 : Diagram to show the piling of pieces in Experiment I, B and C En ligne : https://drive.google.com/file/d/14h849ao9XmG_6ZyJI6mHyymq23GVqeb4/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35481 [article]

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Drum geometry and design / E. Longstaff in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 58 (Année 1974)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 58 (Année 1974) . - p. 41-47 Titre : Drum geometry and design Type de document : texte imprimé Auteurs : E. Longstaff, Auteur Année de publication : 1974 Article en page(s) : p. 41-47 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Mélange Tambours (tannage) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Tanning drums fitted with horizontal shelves and or stub pegs are now known to be poor mixers. Scaled experiments with Perspex model drums show that the mixing efficiency can be improved by replacing the traditional fittings with extra long flat-faced pegs (EL-pegs) angled preferably at 45° to the forward movement of the drum. For optimum effect the length of the EL-pegs requires to be at least 0.33 of the drum diameter. Data obtained from the experi¬ments has been used to modify at low colt, large wooden drums in regular tannery use. Note de contenu : - INTRODUCTION : Angled shelves versus pegs - DESCRIPTION OF OTTO SPECHT DRUM - EXPERIMENTS WITH ANGLED PEGS OF NORMAL LENGTH : The effect on small leather loads - The effect on large leather loads - EXPERIMENTS WITH LONG ANGLED PEGS OR SWEEPS : The effect on loads with low or medium floats - The effect on long floats - EXPERIMENTS WITH EXTRA-LONG ANGLED PEGS : The effect of six extra-long pegs - The effect of four extra-long pegs and two standard pegs - PRINCIPLE OF ANGLED EXTRA-LONG PEGS : Optimum peg lengths - Optimum number of pegs - Optimum number of rows of pegs - SECOND SERIES OF EXPERIMENTS WITH WIDE PERSPEX LABORATORY DRUM : Description of wide Perspex laboratory drum - EXPERIMENTS WITH WIDE PERSPEX DRUM : The effect on leather movement - The effect on the float - APPLICATION TO TANNERY DRUMS - Table 1 : The effect of peg shape on transverse movement of skins in a tanning drum En ligne : https://drive.google.com/file/d/1XgHWkFrh76XtjTYnNNv59biGk5zjy62f/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35482 [article]

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A novel approach to the assessment of the level dyeing characteristics of acid dyes / R. H. Ricketts in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 58 (Année 1974)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 58 (Année 1974) . - p. 63-66 Titre : A novel approach to the assessment of the level dyeing characteristics of acid dyes Type de document : texte imprimé Auteurs : R. H. Ricketts, Auteur Année de publication : 1974 Article en page(s) : p. 63-66 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants acides Colorimétrie Cuirs et peaux -- Teinture Essais (technologie) Evaluation Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A method of comparing the level dyeing characteristics of acid dyes is described in which randomly selected pieces of leather are dyed together and the mean colour difference AE of the patterns determined using ANLAB space. The significance of the differences between dyes is analysed statistically. The use of the technique to study the effect of dyeing conditions on levelness is discussed. Note de contenu : - Theoretical considerations - Experimental : Colour measurement - Dyestuff evaluation - Table 1 : Significance test (t-test) - Table 2 : Effect of level dyeing agent on Daramene Brown AD - Table 3 : Effect of level dyeing agents on Procilan Brown BR En ligne : https://drive.google.com/file/d/1oKi5R1vza7dky95d9RsPam0w0tDJzVhF/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35483 [article]

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A simple approach to leather process investigation / P. Laight in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 58 (Année 1974)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 58 (Année 1974) . - p. 88-99 Titre : A simple approach to leather process investigation : Part 1 - Standardisation of the leather manufacturing process Type de document : texte imprimé Auteurs : P. Laight, Auteur ; Alan Gordon Ward, Auteur ; S. Wolstenholme, Auteur Année de publication : 1974 Article en page(s) : p. 88-99 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Analyse Cuirs et peaux -- Propriétés mécaniques Essais (technologie) Essais dynamiques Mesure Poids Procédés de fabrication Surfaces (Physique) Tannage Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : A standard process for the production of chrome side leather has been developed, based on studies of individual operations as well as on a critical study of the complete process selected. Details of the equipment evolved for the process, the process conditions and the chemicals employed are outlined. Preliminary results are reported for weight and area variation of hide segments at the various stages of the process. Physical tests have been carried out at selected locations on the segments of unfinished leather. The process finally chosen provides a satisfactory basis from which to study selected process variations. Note de contenu : - Development of the standard process - Process details : Chemicals and conditions - Techniques - Test method details : Weight and area measurement - Subjective and objective physical testing - Chemical tests - Results : Raw material variations - Weight and area variations during processing - Implications - Chemical results - Objective and subjective physical results - Table 1 : Conditions used in testing tensile samples (instrument : Instron 1112 chart recorder) - Table 2 : Average hide weights and areas - Table 3 : Weight variations after pre-tannage sub-process - Table 4 : Weight variations after tannage and post-tannage sub-processes - Table 5 : Weight after brine pile as % of washed weight - Table 6 : Analytical results - Table 7 : Linear extension (see also table IX) - Table 8 : Grain crack (d) and rupture (e) lastometer distention values (mm) - Table 9 : Maximum stress during tear (kg mm-1) (f), extension at rupture (%) for linear extension (g) - Table 10 : Overall segment averages for physical test results En ligne : https://drive.google.com/file/d/1A95K1AY5enimAV7QKWOFMsiV7ZNnQaQG/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35484 [article]

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Temporary preservation of hides using boric acid / I. R. Hughes in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 58 (Année 1974)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 58 (Année 1974) . - p. 100-103 Titre : Temporary preservation of hides using boric acid Type de document : texte imprimé Auteurs : I. R. Hughes, Auteur Année de publication : 1974 Article en page(s) : p. 100-103 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Borique, Acide Cuirs et peaux -- Conservation Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The use of boric acid for temporary preservation of hides has been investigated. Cuttings, soaked for 15 min in saturated boric acid solution, were stored for five days at 30°c before attaining a volatile to total nitrogen ratio of 1%. Untreated cuttings attained this value in two days. In a laboratory experiment a boric acid bath was used 50 times without losing effectiveness. In a pilot scale experiment nine batches of hides, totalling 3100 kg, were soaked and stored for up to 29 days at 14°c. Leather from the boric acid treated, green and wet salted hides did not differ significantly in appearance or physical properties. Note de contenu : - Figure : Frozen section of ox hide 22 days after boric acid treatment. X 50, stained azure A. The epidermis is adherent and the hair tight - Table 1 : Boric acid contents and storage lives of hide pieces soaked for different times - Table 2 : Boric acid contents and storage lives of hide pieces soaked consecutively for 15 min En ligne : https://drive.google.com/file/d/1TWxVhJrvr2X6pGgoJKjBeJ0JuqUQPYdj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35485 [article]

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The effect of dye constitution on the wettability of chrome leather / D. E. Crack in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 58 (Année 1974)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 58 (Année 1974) . - p. 115-119 Titre : The effect of dye constitution on the wettability of chrome leather Type de document : texte imprimé Auteurs : D. E. Crack, Auteur ; S. Wolstenholme, Auteur Année de publication : 1974 Article en page(s) : p. 115-119 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants Cuir teint Cuirs et peaux -- Propriétés mécaniques Cuirs et peaux de daims Echantillonnage Essais (technologie) Matières premières Mouillabilité Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Suede split chrome tanned leather obtained in the crust condition was dyed with various dyes of known chemical structure. The wettability of the dyed leathers was assessed by a series of tests. The results showed that the constitution of the dyes affects the wettability of the leather used. Note de contenu : - The dyes - Group I and II - Raw material - Sampling - Dyeing - Wettability testing - Table 1 : The water drop test results - Table 2 : Results of the dynamic flexing tests - Table 3 : Quantities calculated from dynamic flexing test results - Table 4 : Experimental data and quantities calculated from the wet rubbing test - Table 5 : Experimental data and quantities calculated from the bottle shake experiment En ligne : https://drive.google.com/file/d/1P2ZD2Gv2J-0-B6Lq-z2TfiOL43k2QkIc/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35486 [article]

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Short-term preservation of hides and skins. Storage for three weeks / Desmond R. Cooper in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 58 (Année 1974)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 58 (Année 1974) . - p. 120-124 Titre : Short-term preservation of hides and skins. Storage for three weeks Type de document : texte imprimé Auteurs : Desmond R. Cooper, Auteur ; A. C. Galloway, Auteur Année de publication : 1974 Article en page(s) : p. 120-124 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse des données Antiseptiques Cuirs et peaux -- Conservation Cuirs et peaux -- Stockage Essais (technologie) Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Studies on the preservation of skins with antiseptics alone have been made for 20 days' storage at 25°c. These salt-free short-term preservation methods are important to the hide, skin, fellmongering and leather industry in combating salt effluent, particularly in inland areas. Physical tests on the garment leather produced from these antiseptic treated skins shows that this method is capable of preserving skins for 20 days at 25°c but visual assessment of leather and grain quality revealed that the antiseptic treated skins yielded leather which was in general of slightly inferior quality and with more grain blemishes. The reasons for this are under investigation. The results also show that sodium chlorite in the antiseptic mixture gives an inferior product. Nevertheless the results are encouraging for the development of a practical and economic method for the short-term preservation of hides and skins without salt. Note de contenu : - METHODS : STP 8 - STP 9 - STP 10 - Processing of skins after storage - Analysis of data - RESULTS : Comparison of combined data for the six antiseptic treatments with controls - Comparison of combined data for three antiseptic treatment with controls - Tests for grain strength of the garment leather - Comparison of three chlorite treatments with controls - Grain and leather quality - Relation between grain quality assessment and martindale grain abrasion En ligne : https://drive.google.com/file/d/17xJZr5eZVxBUUz1bW9s2i-5QY65OcMP7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35487 [article]

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The measurement of elongation at break in the leather testing / R. Guy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 58 (Année 1974)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 58 (Année 1974) . - p. 137-144 Titre : The measurement of elongation at break in the leather testing Type de document : texte imprimé Auteurs : R. Guy, Auteur ; A.-G. Marriott, Auteur Année de publication : 1974 Article en page(s) : p. 137-144 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Allongement à la rupture Cuirs et peaux -- Propriétés mécaniques Essais de résilience Essais dynamiques Mesure Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The separation of the bench marks and jaws have been used to calculate the elongation at break of two leathers using the 1957 SLTC specimen shape and the current IUP/6 large specimen. Two tensometers were used, an Instron and a 250 kg Howden. The jaw design is crucial if jaw separation measurements are used. Positive clamping is essential and self-tightening jaws should be avoided. The IUP/6 specimen gave lower but more reproducible values than the 1957 SLTC specimen. Jaw separation measurements were more reproducible than those from bench marks. In a separate experiment the three IUP/6 specimens, a modified version of the medium-size specimen and the 1957 SLTC specimen were compared. Seventeen leathers were tested using the Instron only. The results from the 1657 SLTC specimen by bench mark separation are very close to those obtained from the medium and small IUP/6 specimens by jaw separation. The large IUP/6 specimen gave lower but more reproducible values than any other specimen. The 1957 SLTC specimen gave worst reproducibility. Note de contenu : - COMPARISON OF 1957 AND THE LARGE IUP/6 SPECIMEN : Experimental - Results - Discussion - COMPARISON OF FIVE SPECIMEN SHAPES : Experimental - Results - Fig.1 : (a) 1957 STLC specimen, dimensions in inches. (b) IUP/6 specimens, dimensions in mm. - Fig.2 : Large IUP/6 specimen clamped by (a) Instron pneumatic jaws (note the 1.0 mm grid used to measure elongation at 25 kg). (b) Howden self-tightening wedge jaws (note the jaw slip as shown by original jaw lines). -Fig.3 : The effect of specimen width on the elongation at break of the large IUP/6 test specimen, means of 12 determinations. - Fig.4 : Jaw distortion of large IUP/6 and 1957 SLTC specimens, 2.5 "spaces" visible in each case. - Fig.5 : The model of 1957 SLTC specimen used in calculating the difference in elongation at break as given by jaw separation and bench marks. - Table 1 : IUP/6 Test Piece Dimensions - Table 2 : Elongation at break (%) from specimens tested on the instron - Table 3 : Elongation at break (%) effects of specimen, direction and method of measurement for firm leather around the O.S.P.-Intron tests - Table 4 : Standard error of a single observation, Intron tests - Table 5 : % Elongation at break, Howden test - Table 6 : Standard error of a single observation, Howden test - Table 7 : Elongation at 25 kg load (%), Instron tests - Table 8 : %Elongation at 25kg load, Instron tests - Table 9 : Elongation at break (%) of five specimen shapes, measured by two methods - Table 10 : Standard error of a single observation for various specimens and methods of measurement - Table 11 : "Number of spaces showing" at break. Five specimen shapes (see text for an explanation of the terms) - Table 12 : "Corrected" elongation at break from jaw separation, IULCS specimens En ligne : https://drive.google.com/file/d/1icIjo9ND6eAPJxvpgb3cj4sRjkzFYeT1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40681 [article]

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The choice of experimental error in the determination of some tensile parameters of leather / R. Guy in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 58 (Année 1974)  

[article]  inJOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 58 (Année 1974) . - p. 145-146 Titre : The choice of experimental error in the determination of some tensile parameters of leather Type de document : texte imprimé Auteurs : R. Guy, Auteur ; A.-G. Marriott, Auteur Année de publication : 1974 Article en page(s) : p. 145-146 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Propriétés mécaniques Essais dynamiques Protocole d'étude Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Elsewhere we have described the measurement of tensile parameters of various leathers by a number of experimental procedures. The object of the work being firstly to determine whether the procedures affect the absolute values of the tensile parameters and secondly to determine the reproducibility of the test methods. En ligne : https://drive.google.com/file/d/1eN4ASVyQBjbvecV6pa-r4ohU8eVhIJG9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40682 [article]

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