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Raman and ATR-FTIR spectroscopy towards classification of wet blue bovine leather using ratiometric using ratiometric and chemometric analysis / Megha Mehta in JOURNAL OF LEATHER SCIENCE AND ENGINEERING, Vol. 2 (Année 2020)
[article]
Titre : Raman and ATR-FTIR spectroscopy towards classification of wet blue bovine leather using ratiometric using ratiometric and chemometric analysis Type de document : texte imprimé Auteurs : Megha Mehta, Auteur ; Rafea Naffa, Auteur ; Catherine Maidment, Auteur ; Geoff Holmes, Auteur ; Mark Waterland, Auteur Année de publication : 2020 Article en page(s) : 15 p. Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse multivariée
Cuirs et peaux -- Analyse
Cuirs et peaux -- Défauts
Cuirs et peaux de bovins
Réflexion totale atténuée
Spectroscopie Raman
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : There is a substantial loss of value in bovine leather every year due to a leather quality defect known as “looseness”. Data show that 7% of domestic hide production is affected to some degree, with a loss of $35 m in export returns. This investigation is devoted to gaining a better understanding of tight and loose wet blue leather based on vibrational spectroscopy observations of its structural variations caused by physical and chemical changes that also affect the tensile and tear strength. Several regions from the wet blue leather were selected for analysis. Samples of wet blue bovine leather were collected and studied in the sliced form using Raman spectroscopy (using 532 nm excitation laser) and Attenuated Total Reflectance - Fourier Transform InfraRed (ATR-FTIR) spectroscopy. The purpose of this study was to use ATR-FTIR and Raman spectra to classify distal axilla (DA) and official sampling position (OSP) leather samples and then employ univariate or multivariate analysis or both. For univariate analysis, the 1448 cm− 1 (CH2 deformation) band and the 1669 cm− 1 (Amide I) band were used for evaluating the lipid-to-protein ratio from OSP and DA Raman and IR spectra as indicators of leather quality. Curve-fitting by the sums-of-Gaussians method was used to calculate the peak area ratios of 1448 and 1669 cm− 1 band. The ratio values obtained for DA and OSP are 0.57 ± 0.099, 0.73 ± 0.063 for Raman and 0.40 ± 0.06 and 0.50 ± 0.09 for ATR-FTIR. The results provide significant insight into how these regions can be classified. Further, to identify the spectral changes in the secondary structures of collagen, the Amide I region (1600–1700 cm− 1) was investigated and curve-fitted-area ratios were calculated. The 1648:1681 cm− 1 (non-reducing: reducing collagen types) band area ratios were used for Raman and 1632:1650 cm− 1 (triple helix: α-like helix collagen) for IR. The ratios show a significant difference between the two classes. To support this qualitative analysis, logistic regression was performed on the univariate data to classify the samples quantitatively into one of the two groups. Accuracy for Raman data was 90% and for ATR-FTIR data 100%. Both Raman and ATR-FTIR complemented each other very well in differentiating the two groups. As a comparison, and to reconfirm the classification, multivariate analysis was performed using Principal Component Analysis (PCA) and Linear Discriminant Analysis (LDA). The results obtained indicate good classification between the two leather groups based on protein and lipid content. Principal component score 2 (PC2) distinguishes OSP and DA by symmetrically grouping samples at positive and negative extremes. The study demonstrates an excellent model for wider research on vibrational spectroscopy for early and rapid diagnosis of leather quality. Note de contenu : - EXPERIMENTAL : Sample preparation - Data acquisition and spectral processing
- RESULTS AND DISCUSSION : Peaks of interest - Univariate analysis - Multivariate analysis
- Table 1 : Raman and infrared spectroscopic band assignments for Wet Blue leather
- Table 2 : Raman band assignments distinguishing loose and tight wet blue leather
- Table 3 : Deconvoluted amide I band assignments for protein secondary structures
- Table 4 : Confusion matrix for Raman univariate analysis
- Table 5 : Confusion matrix for IR univariate analysis
- Table 6 : Confusion matrix for the classification of OSP and DA based on the PCA-LDA modelDOI : 10.1186/s42825-019-0017-5 En ligne : https://link.springer.com/content/pdf/10.1186/s42825-019-0017-5.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37139
in JOURNAL OF LEATHER SCIENCE AND ENGINEERING > Vol. 2 (Année 2020) . - 15 p.[article]Reduction in friction during wet processing in tanning / Knud Lassen in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 66 (Année 1982)
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Titre : Reduction in friction during wet processing in tanning Type de document : texte imprimé Auteurs : Knud Lassen, Auteur Année de publication : 1982 Article en page(s) : p. 79 Langues : Anglais (eng) Catégories : Cuirs et peaux -- Défauts
Frottements (mécanique)
TannageIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : The tanner has to accept a good deal of damage in raw hides or skins which is unavoidable, but it is most regrettable when during processing defects are caused or accentuated.
Such damage today originates from mechanical causes.
Rationalisation in the leather industry has resulted in the use of larger vessels and short floats. This increases the friction between hides or skins or increased friction with drum walls. In short floats the material becomes en tangled and chemicals are distributed irregularly. In all wet operations defects through rubbing can occur.En ligne : https://drive.google.com/file/d/1wdcw0uqe6JYDAzLBTxAeT-2h7xpyl8O0/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40227
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 66 (Année 1982) . - p. 79[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007129 - Périodique Bibliothèque principale Documentaires Disponible Region wise surface level defect detection and ranking of crust leather images based on image processing techniques / S. Nithiyanantha Vasagam in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVIII, N° 7 (07/2023)
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Titre : Region wise surface level defect detection and ranking of crust leather images based on image processing techniques Type de document : texte imprimé Auteurs : S. Nithiyanantha Vasagam, Auteur ; M. Sornam, Auteur Année de publication : 2023 Article en page(s) : p. 282-292 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse d'image L'analyse d'image est la reconnaissance des éléments contenus dans l'image. Il ne faut pas confondre analyse (décomposition en éléments) et traitement (action sur les composantes) de l'image.
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 -- Défauts
Détection de défauts (Ingénierie)
Surfaces -- défautsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Sorting and aligning of crust leather for grading on position wise defect distribution is one of the methods adopted in the tanning industry. This method is generally carried out manually by a veteran on official sampling position and their input is critical because it is directly linked to sales of the crust leather. The opinion of the experts is believed to be stable and consumes a good amount of time too. Hence, in the current research a robust defect detection method and ranking of crust leather images based on image processing techniques is proposed to give a stable solution in a short span of time. A custom-made dataset of crust leather images consisting of 5640 images were used in this study. The pixel intensity has been extracted on demarcated position of various regions including neck, belly left, belly right, center and butt instead of official sampling position through horizontal and vertical mapping of coordinates with a new method Grading Score on Image Position wise (GSIP) on the actual images. The image processing techniques using Canny Edge Detection and filters such as Laplacian, Median, Prewitt, Roberts, Sobel and Scharr were implemented to get the pixel intensity grouped and classified based on parameters within acceptable range using a Naïve Bayes Classifier. The classifier confirms that the accuracy of Set I - Actual Images and Set II - Defects with implementation of canny edge detection over other image processing techniques at 99.50%. Therefore, the current research confirms that the proposed GSIP method would give an additional tool to inspectors while ranking the crust leather based on region wise surface level defect detection of crust leather images based on image processing techniques. Note de contenu : - Dataset of crust leather images
- Regions wise horizontal and vertical mapping
- Feature extraction
- Generation of ranking matrix
- Classification with naive bayes
- Table 1 : Summary of Authors, Techniques and Area
- Table 1 : Sample 6×6 Matrix representation of pixel points where i is row, j is column and n represent the size = 6
- Table 2 : Representation of three region mapping of pixel point as Row Size (RS) = n/3
- Table 3 : Cutting area and corresponding Grading
- Table 4 : Intermittent Leather grading based on area of usefulness based on demerit count
- Table 5 : Ranking based on Pixel intensity value associated with the co-ordinates of horizontal (Row i) and vertical (Column j)
- Table 6 : Coordinates for an image of 250 × 250
- Table 7 : Demarcated position of various regions within the hide for surface defect detection
- Table 8 : Ranking of Dataset I and II
- Table 9 : Naïve Bayes Classifier Comparison of various image filesDOI : https://doi.org/10.34314/jalca.v118i7.7856 En ligne : https://drive.google.com/file/d/1KlGnwGbGA8ZA6a6wO5y74ab-LV-tcsz4/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39662
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVIII, N° 7 (07/2023) . - p. 282-292[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 24133 - Périodique Bibliothèque principale Documentaires Disponible Répercussions économiques des défauts de texture de la peau des ovins / M. Laidet in TECHNICUIR, N° 7 (09/1971)
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Titre : Répercussions économiques des défauts de texture de la peau des ovins Type de document : texte imprimé Auteurs : M. Laidet, Auteur Année de publication : 1971 Article en page(s) : p. 30-34 Langues : Français (fre) Catégories : Cuirs et peaux -- Défauts
Cuirs et peaux -- Texture
Cuirs et peaux de moutonsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Défauts de texture, cette expression désigne l'ensemble des altérations de la peau dues à une modification sensible de la structure du derme. Tout relâchement ou manque de densité fibreuse donne un tissu creux et mou. Par contre, une induration plus ou moins accentuée du derme, localisée ou très étendue, est essentiellement caractérisée par une impossibilité de le tanner correctement et d'obtenir ensuite sur le velours une teinture homogène de la zone défectueuse. Note de contenu : - La noisillure
- La rideEn ligne : https://drive.google.com/file/d/1KnV6GyY5Qk6NzcQ_VHsBsMczFbpI2kg4/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35158
in TECHNICUIR > N° 7 (09/1971) . - p. 30-34[article]Exemplaires (2)
Code-barres Cote Support Localisation Section Disponibilité 009710 - Périodique Archives Documentaires Exclu du prêt 009735 - Périodique Archives Documentaires Exclu du prêt Sarcoptic mange in goats and sheep : studies on the defects and economic losses resulting from damage caused by the disease on crust leather / K. E. E. Ibrahim in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 72 (Année 1988)
[article]
Titre : Sarcoptic mange in goats and sheep : studies on the defects and economic losses resulting from damage caused by the disease on crust leather Type de document : texte imprimé Auteurs : K. E. E. Ibrahim, Auteur ; Mukhtar Taha Abu-Samra, Auteur Année de publication : 1988 Article en page(s) : p. 135-144 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Défauts
Cuirs et peaux de chèvres
ParasitosesIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A survey of 5250 goats and 4220 sheep in the Sudan for sarcoptic mange revealed an incidence of 5,5 % (290) in the former and 5,2 % (221) in the latter species, respectively.
Severe and localised or generalised lesions were seen in the infested animals. Skin scrapings from infested animals revealed numerous specimens of sarcoptes scabiei, showing that the animals were heavily infested.
Severe histopathological changes were seen in skin sections. These changes mainly comprised : hyperkeratosis, acanthosis ans scab formation, beneath which numerous mites were seen. Severe cellular infiltration, micro-abscessation, degenerative and necrotic changes and marked proliferation of connective tissue also occured.
Infested skins were green graded as "rejects" and the prepared crust leather was graded as "rejects" or "double rejects". Infested skins were difficult to finish into crust leather. The disease caused a marked reduction in the aesthetic appeal and cutting area of the leather. The crust leather prepared from infected skins was unsightly, hard, and fibrosed, with many tunnellings. The grain surface was coarse, rough and the fibres were loose and had a fluffy appearance. In severely infested areas, numerous holes were seen and, in some cases, the leather was completely damaged.
Leather sections from infested areas showed great distortion and disintegration of the fibres with large areas of micro-abscessation. Towards the grain surface, the fibres along the tunnels of the mite were eaten away, became thin, loose and had a fluffy appearance beneath which many empty spaces and areas of fibrosis were seen.
The disease caused a marked reduction in the tensile strength and apparent density of crust leather. In severely infested animals,the leather specimens were cut before the machine could even give a reading, showing complete loss of durability. The disease caused a false increase in the mean thickness and volume but brought about a marked reduction in the weight of the infested specimens.
Skins so affected were completelyrejected or fetched very low prices resulting in serious economic losses.
Goats were experimentally infested with sarcoptes scabiei mites. The results obtained from the clinical picture of the lesions produced, the grading of skins, the examination of histological and leather sections and physical testing of the crust leather produced, confirmed the results obtained from the survey. Treatment of the experimental lesions led to improvement of the quality of the leather eventually produced, showing that recovery from the damage could be obtained, providing that infested animals are (a) treated in the early stages of the disease and (b) ample time is given before the animals are slaughtered, in order to allow for proper restoration of the skin.En ligne : https://drive.google.com/file/d/1FMSFaYkUa5yy9034OWxCR5Vv3oVyZ3ha/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9104
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 72 (Année 1988) . - p. 135-144[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 007134 - Périodique Bibliothèque principale Documentaires Disponible Sauvez la peau du troupeau / Jacques-Hubert Lefebvre / Paris : Office National Interprofessionnel des Viandes, de l'Elevage et de l'Aviculture (1997)
PermalinkSolving vein marks defects problem through wet end process / K. Gowthaman in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CIX, N° 9 (09/2014)
PermalinkStudies on selective defect identification of crust leathers for computer-aided grading / S. Nithiyanantha Vasagam in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CVIII, N° 6 (06/2013)
PermalinkLa tannerie - Tome I / Louis Meunier / Paris : Gauthier-Villars Editeur (1951)
PermalinkThe activity of the hair follicle and its relation to the defects of the grain layer / M. L. Garro in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 4 (07-08/2006)
PermalinkPermalinkPermalinkThe direct and positive influence of animal welfare on hide and skin values / V. J. Cartledge in WORLD LEATHER, Vol. 9, N° 3 (05/1996)
PermalinkThe effect of infection with dermatophilus congolensis on lamb and sheep pelts / Sue M. Cooper in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 77, N° 3 (05-06/1993)
PermalinkThe probable cause of the multiple linear scratch defect of cattle hides in Ireland / H. P. Baker in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 61 et 62 (Années 1977 et 1978)
PermalinkThe probable cause of the multiple linear scratch defect of cattle hides in Ireland / H. P. Baker in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 62, N° 5 (09-10/1978)
PermalinkThe problem with dung on hides / Institute for Creative Leather Technologies (University of Northampton, Northampton, United Kingdom) in LEATHER INTERNATIONAL, Vol. 214, N° 4824 (09/2012)
PermalinkPermalinkUpgrading - how to make the most from the least / Armando Escobedo in LEATHER INTERNATIONAL, Vol. 212, N° 4802 (08/2010)
PermalinkUpgrading keeping leather's elegance / M. Pasquet in WORLD LEATHER, Vol. 18, N° 8 (12/2005 - 01/2006)
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