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JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) . Vol. CXVII, N° 2Mention de date : 02/2022Paru le : 16/03/2022 |
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Ajouter le résultat dans votre panierSalt free preservation of raw goat skin using swietenia mahogany (seed) extract / Md. Abdur Razzaq in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 2 (02/2022)
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Titre : Salt free preservation of raw goat skin using swietenia mahogany (seed) extract Type de document : texte imprimé Auteurs : Md. Abdur Razzaq, Auteur ; Murshid Jaman Chowdhury, Auteur ; Md. Tushar Uddin, Auteur Année de publication : 2022 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Acajou et constituants
Bactéries -- Comptage
Chlorure de sodium -- Suppression ou remplacement
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 -- Conservation
Cuirs et peaux -- Propriétés organoleptiques
Cuirs et peaux -- Propriétés physiques
Cuirs et peaux -- Teneur en azote
Cuirs et peaux -- Teneur en humidité
Cuirs et peaux de chèvres
Extraits de plantes
Pollution -- Analyse
Température de retraitIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Curing of hides and skins using sodium salt is a well-established and economical preservation technique worldwide. But it contributes to generating a large amount of total dissolved solids (TDS) and increasing the salinity of water during leather processing which is a threat to the environment. The current research is an attempt to preserve goat skin using mahogany (Swietenia mahogany) seed’s extract. In real practice different percentages of mahogany seed extract were applied on raw goat skin and 3% (by weight of skin) of it showed best result. To evaluate the preservation efficiency, related parameters of preservation viz. odor, hair slip, shrinkage temperature, moisture content, bacterial count etc. were monitored regularly for 30 days. The obtained results were compared with conventional salt curing process. The experimental trial showed efficiency in lessening TDS value and chloride content. The preserved goat skins of both trials were treated following conventional leather processing techniques and physical properties were studied. The discussed preservation method exhibited comparable result in every index. Note de contenu : - MATERIAL AND METHOD : Collection of skin - Chemicals - Collection and extraction of mahogany seed - FTIR analysis - Application of extract for curing - Moisture content - Nitrogen content - Bacterial count - Hydrothermal property - Leather making - Pollution load analysis - Physical properties analysis - SEM analysis
- RESULTS AND DISCUSSION : Organoleptic properties - FTIR analysis - Moisture content - Nitrogen content - Bacterial count - Shrinkage temperature - Pollution load analysis - Physical properties study - SEM analysis
- Table 1 : Organoleptic properties of goat skin preserved with mahogany seed extract
- Table 2 : Moisture content (%) of preserved skins
- Table 3 : Nitrogen content (gm/kg of sample) of preserved skins
- Table 4 : Bacterial count in the preserved skins
- Table 5 : Shrinkage temperature (°C) of preserved skins
- Table 6 : Pollution load status of soaking liquor
- Table 7 : Physical properties of processed crust leatherDOI : https://doi.org/10.34314/jalca.v117i2.4727 En ligne : https://drive.google.com/file/d/1QzAVPnrOyLWN0PcOw6q3o1K8JLkOyaFE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37165
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Code-barres Cote Support Localisation Section Disponibilité 23289 - Périodique Bibliothèque principale Documentaires Disponible Carbonization region measurement in vegetable tanned goat leather using machine vision system for evaluating performance measures of leather cut contour edges / S. Vasanth in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 2 (02/2022)
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Titre : Carbonization region measurement in vegetable tanned goat leather using machine vision system for evaluating performance measures of leather cut contour edges Type de document : texte imprimé Auteurs : S. Vasanth, Auteur ; T. Muthuramalingam, Auteur ; Sanjeev Gupta, Auteur Année de publication : 2022 Article en page(s) : p. 54-61 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Carbonisation
Coupe
Cuirs et peaux de chèvres
Diodes lasers
Imagerie (technique)
MesureIndex. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : Due to the widespread application and popularity of lasers in recent times, the usage of laser cutting for leather applications has increased as well. Laser technology is needed to provide more consistent and effective results while cutting leathers that include complicated geometries particularly in several sectors where leathers are often utilized such as footwear, apparel and fashion accessories. In this investigation, the diode laser was preferred for leather cutting due to its regulated power density, compact size and portability whereas the CO2 lasers are uncontrollable. The benefit of employing a diode laser is that it can overcome some of the disadvantages associated with CO2 lasers such as power consumption, carbonization layer and geometric inaccuracy. There is no technique available to measure the carbonization at the leather cut contour edges. Hence an attempt has been made to investigate the carbonization percentage with the help of a machine vision system to improve the machining process. The technique of measuring carbonization can be used effectively in the leather industry for the accurate measurement of carbonization. The lower duty cycle with moderate pulse width modulation (PWM) and amplitude could produce lower carbonization layer. PWM frequency has a high influential role on determining carbonization in leather cutting. Note de contenu : - INTRODUCTION : Experimental methodology - Machine vision module arrangement - Enchancement of acquired images - Conversion of color image to binary image - Design layout in diode based LBM
- RESULTS AND DISCUSSION : Calibration of USB digital microscope - Image processing of the specimens - Programming techniques on the measurement - Effects of process parameters on carbonization
- Table 1 : Input process variables
- Table 2 : Design layout in power diode based LBM
- Table 3 : Measurement of carbonization percentageDOI : https://doi.org/10.34314/jalca.v117i2.4728 En ligne : https://drive.google.com/file/d/19QC2Z_9DCQq4uh6YzEE6DMHJdKs0bJFL/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37166
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Code-barres Cote Support Localisation Section Disponibilité 23289 - Périodique Bibliothèque principale Documentaires Disponible H.E.A.T. A new sustainable green solution for treating and evaporating hide brind wastewater / Russell H. Vreeland in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 2 (02/2022)
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Titre : H.E.A.T. A new sustainable green solution for treating and evaporating hide brind wastewater Type de document : texte imprimé Auteurs : Russell H. Vreeland, Auteur ; Long John, Auteur Année de publication : 2022 Article en page(s) : p. 62-70 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bain de saumure
Demande biochimique en oxygène
Diversité bactérienne
Eaux usées -- Stations de traitements
Evaporation -- Mesure
LagunageIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Salt curing of hides releases a significant amount of excess water that must be disposed. In larger abattoirs this can result in production of tens of thousands of gallons of saturated salt brine that is also contaminated with biological material from the hides. These brines are often stored in enclosed impoundments that ultimately fill and need replacement, or the facility must build multiple impoundments. The proprietary, biologically based, sustainable Halophilic Evaporative Applications Technology (H.E.A.T.) process has been developed as a method to accelerate the evaporation of salt saturated brines. The process has been tested for 18 months in a full-scale lagoon located at an operating American beef plant. The process successfully evaporated an additional 31.99 inches of brine (866,900 gal) acre-1 of concentrated hide brine in one year, nearly drying out the South lagoon. Ambient evaporation of the same brine in an identical control lagoon at the site was only 19.19 inches (520,000 gallons) acre-1 representing a 1.66x increase in brine evaporation from the H.E.A.T. microbes. During 2020, the plant produced 3,376,000 gallons of brine, meaning H.E.A.T. evaporated 100.4 % of plant production in one lagoon in its first year. This was accomplished without additional infrastructure, equipment or external heating. During this test, Biochemical Oxygen Demand in the lagoons decreased over 98% with concomitant odor reduction. Beginning in October 2020, the lagoon began receiving all brine produced daily by the plant. This continued over the winter period, during which time the process evaporated over 34% of the inflow. Continued fertilization and microbial augmentation are essential for the continued healthy development of the system. Overall, the process and its essential microbial populations were stimulated by continuing inflow of fresh hide brines. The microbial process increases brine evaporation of concentrated salt brines, reduces odors and represents a new environmentally friendly mechanism for solving an industrial problem that has long plagued hide producers. Note de contenu : - MATERIALS AND METHODS : Purpose of the project - Hide lagoons - Evaporation measurement - Bacterial populations - Biochemical Oxygen Demand (BOD) - Loss on ignition
- RESULTS : Evaporation - Bacterial populations - Biochemical Oxygen Demand (BOD) - Loss on ignition - Discussion
- Table 1 : Evaporation in treated south lagoon over first 9 months of 2020
- Table 2 : Evaporation in untreated north lagoon over first 9 months of 2020
- Table 3 : South lagoon responses with all produced hide waste brines being added daily to the single lagoon. Some columns may not add up due to rounding errors while converting to decimal equivalents to reduce the size of the table. The full numbers are shown in the supplementary data filesDOI : https://doi.org/10.34314/jalca.v117i2.4730 En ligne : https://drive.google.com/file/d/1ZOJeNqnBCVZ9Vd9XRKJt8oJvVoPDKsU4/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37167
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Code-barres Cote Support Localisation Section Disponibilité 23289 - Périodique Bibliothèque principale Documentaires Disponible Retanning performance of carboxymethyl starch and its effects on dyeing / Cigdem Kilicarislan Ozkan in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 2 (02/2022)
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Titre : Retanning performance of carboxymethyl starch and its effects on dyeing Type de document : texte imprimé Auteurs : Cigdem Kilicarislan Ozkan, Auteur ; Hasan Ozgunay, Auteur Année de publication : 2022 Article en page(s) : p. 71-81 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Amidon modifié
Amidons -- Oxydation
Caractérisation
Colorants acides
Complexes métalliques
Cuirs et peaux -- Teinture
Cuirs et peaux de chèvres
Résistance à l'abrasion
Retannage
Solubilité
Stabilité hydrothermale
vision des couleurs
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : The tanning characteristics of starch samples modified by different methods were investigated in our previous studies. In this study, utilization of modified starch in leather making as a retanning agent and its effect on dyeing process have been investigated. For this purpose, the molecular size of native corn starch was reduced by H2O2 oxidation and then carboxymethylated. A series of analyses (water solubility, degree of substitution, Fourier Transform Infrared Spectroscopy, Proton and Carbon Nuclear Magnetic Resonance Spectroscopy) were carried out for characterization. Then, carboxymethyl starches were used in retanning processes to be 3, 5 and 10% based on leather weight and the shrinkage temperatures and filling coefficients of the leathers were determined. Acid and metal complex dyestuffs were used in dyeing processes and the effect of carboxymethyl starch on dyeing was also investigated by examining dye consumption, dry and wet rubbing fastness and color of the leathers. From the results it was concluded that carboxymethyl starch showed a noticeable solo performance in terms of filling property and shrinking temperature without any considerable adverse effect on dyeing. Note de contenu : - MATERIALS AND METHODS : Materials - Methods : Hydrogen peroxide (H2O2) oxydation of native corn starch - Determination of product yields - Determination of carboxyl and carbonyl contents of H2O2 oxidized starch - Carboxymethylation of H2O2 oxidized starch - Determination of degree of substitutions - Determination of water solubility of starches - Structure characterizations - The use of carboxymethyl starch in retanning process - Post-retanning tests
- RESULTS AND DISCUSSION : Moisture contents of starches - Product yields, DS and water solubilities of starches - Structure characterizations - Retanning and dyeing experiments - Consumption of dyestuff - Wet and dry rubbing fastness of dyed leather samples - Color differences
- Table 1 : Retanning and dyeing recipe
- Table 2 : The results of hydrothermal stability and filling coefficient gained to the wet-blue goat leathers
- Table 3 : The amounts of dyestuffs remaining in dyeing baths (g/L)
- Table 4 : Wet and dry rubbing fastness results of dyed leather samples
- Table 5 : Color measurement values of leathers retanned with CMS at different ratios and dyed afterwardsDOI : https://doi.org/10.34314/jalca.v117i2.4731 En ligne : https://drive.google.com/file/d/1JKem5CFyvqZmgJgxqGmXohCUPMBmE2fW/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37168
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