Accueil
Catégories
Ajouter le résultat dans votre panier Affiner la recherche
Etendre la recherche sur niveau(x) vers le bas
Influence of different products on wet finishing for leather properties and waste generation / Laisa Grassi in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIX, N° 3 (03/2024)
[article]
Titre : Influence of different products on wet finishing for leather properties and waste generation Type de document : texte imprimé Auteurs : Laisa Grassi, Auteur ; LuÃsa Gonçalves, Auteur ; Vânia Queiroz, Auteur ; Mariliz Gutterres, Auteur ; Caroline Agustini, Auteur Année de publication : 2024 Article en page(s) : p. 132-138 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Caractérisation
Colorants -- Absorption
Cuirs et peaux -- Finition
Cuirs et peaux -- Propriétés mécaniques
Cuirs et peaux -- Teinture
Essais dynamiques
Formulation (Génie chimique)
Plan d'expérience
Produits de nourriture du cuir
Retannage
Stabilité thermique
Tannage végétal
Tara et constituantsC'est un petit arbre épineux avec des gousses plates rouge qui pousse dans les zones sèches du Pérou, Amérique du Sud.Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather is widely used for various applications. The processing involves a series of steps in which chemical processes and mechanical operations are carried out, with the addition of a series of products. Among the performance and quality parameters of the leather produced are the chemical and physical properties. The quality of the leather and the product obtained is influenced by its processing and the products used. Several studies are found in the literature on the effect of processing on leather properties. The present study brings the results of the influence of different products used in retanning, dyeing and fatliquoring (wet finishing) on the final properties of the leather. Physical tests of resistance to tearing, cracking and distension of the grain, the functional groups present in its structure, the thermal stability by DSC and TGA tests, dye uptake rate percentage and the remaining concentration of dye in the solution were used to evaluate the influence of different products on leather properties. It was observed that the parameter that influenced the applied force and the distension of the grain of the leather was the type of retanning agent used; the greater resistance to distension was obtained by Tara retanned leathers. As for the degree of dye uptake rate and remaining concentration of dye in the effluent, they were not affected by the studied parameters and all hides showed similar dye uptake. Regarding tear resistance, the type of grease was the parameter that had a significant effect on leather, higher resistance values were observed for leather greased with Coripol. The novelty of the work is in measuring how different dyeing, retanning and greasing products influence the properties of the final product, which is an advance towards greater cost-benefit in the choice of products to be used in the process. Note de contenu : - EXPERIMENTAL : Characterization - Experimental design - Mechanical properties
- RESULTS AND DISCUSSION : Characterizations - Leather properties
- Table 1 : Variable parameters and levels considered in the experimental design
- Table 2 : Sample names in the experimental design
- Table 3 : Executed formulation for post-tanning wet-blue to procedure with different finishing products
- Table 4 : Mean values of applied force (N) and distention at grain crack (mm) for samples of all leathers analyzed
- Table 5 : Results of the % of Dye uptake the leather
- Table 6 : Results of remaining concentration test
- Table 7 : Results of physical tests of resistance to progressive tearingDOI : https://doi.org/10.34314/383ntk96 En ligne : https://drive.google.com/file/d/11DgKVUVo1kigVuE1mlfpG1kf4RuPsIwH/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40619
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXIX, N° 3 (03/2024) . - p. 132-138[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 24535 - Périodique Bibliothèque principale Documentaires Sorti jusqu'au 13/05/2024 Influence of selected process parameters on the reproducibility of aniline dyeings. II. The influences of retanning and dyeing processes of aniline dyeings / Rolf Streicher in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXVII, N° 8 (08/1992)
[article]
Titre : Influence of selected process parameters on the reproducibility of aniline dyeings. II. The influences of retanning and dyeing processes of aniline dyeings Type de document : texte imprimé Auteurs : Rolf Streicher, Auteur ; Dietrich Lach, Auteur ; B. Magerkurth, Auteur Année de publication : 1992 Article en page(s) : p. 296-311 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Aniline
Cuirs et peaux -- Teinture
Retannage
Wet-blue (tannage)Peau tannée au chrome (le chrome donne une couleur bleue)Index. décimale : 675.2 Préparation du cuir naturel. Tannage Résumé : In part I of this paper, the influence of wet blues on the reproducibility of aniline dyeings was discussed. The present paper shows the influence of the following parameters on the intensity and levelness of shades :
- Floatlength during retannage
- Temperature during retannage
- Floatlength during dyeing
- Temperature during dyeing
- The physical form of the duestuff before addition
- Running time during fixation with formic acid
Every variation of one of the parameters above was studied using a retannage with a pronounced bleaching effect, a retannage with a low bleaching effect, and two dyestuffs with different build-up properties on retanned leathers.
Results : Short floats and low temperatures in retanning result in dyeings of deeper shades. Variation of the same parameters in the dyeing process gave reversed results. The intensity of a shade is increased by the addition of the dyestuff in dissolved form or as a liquid dye. Variations in retanning and dyeing processes can be compensated better by using a less bleaching retannage and dyeing in steps with a dyestuff having good build-up properties.Note de contenu : - INFLUENCE OF RETANNING AND DYEING PROCESSES ON ANILINE :
- Influence of the neutral salt content of the wetblues
- Influence of float length in retannage
- Influence of temperature during retannage
- Influence of the float length in dyeing
- Influence of temperature during dyeing
- Influence of the physical form in which the dyestuff is added
- Influence of the drumming time with formic acid for the fixation of dyestuffs
- Fig. 1 : Influence of retanning and dyeing processes on aniline dyeings
- Fig. 2 : Retanning methods applied
- Fig. 3 : Method for the assessment of dyeings
- Fig. 4 : Influence of neutral salt content on aniline dyeings
- Fig. 5 : Influence of float length during retanning on aniline dyeings
- Fig. 6 : Influence of temperature during retanning on aniline dyeings
- Fig. 7 : Absorption of white tanning agent in relation to temperature
- Fig. 8 : Influence of float length during dyeing process on aniline dyeings
- Fig. 9 : Influence of temperature during dyeing process on aniline dyeings
- Fig. 10 : Absorption of acid brown 161 in relation to temperature
- Fig. 11 : Influence of form in which the dye is added on aniline dyeings
- Fig. 12 : Influence of drumming time with formic acid on aniline dyeingsEn ligne : https://drive.google.com/file/d/1lsyEGrRJuqLcCwMqUih_Bxavio3ShAUw/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39842
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. LXXXVII, N° 8 (08/1992) . - p. 296-311[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 006896 - Périodique Bibliothèque principale Documentaires Disponible Influence of ultrasound on the adsorption, diffusion and kinetics of leather dyeing process : mechanistic insight / Venkatasubramanian Sivakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXV, N° 7 (07/2020)
[article]
Titre : Influence of ultrasound on the adsorption, diffusion and kinetics of leather dyeing process : mechanistic insight Type de document : texte imprimé Auteurs : Venkatasubramanian Sivakumar, Auteur Année de publication : 2020 Article en page(s) : p. 239-247 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Colorants -- Adsorption
Colorants acides
Cuirs et peaux -- Teinture
Diffusion (physique)
Rouge (couleur)
UltrasonsIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather is a natural porous material, which is composed of a three-dimensional weave of tanned collagen fibre bundles. This paper studies the influence of power ultrasound on the adsorption and kinetics of leather dyeing process. Dyeing experiments have been carried out using ultrasound (150 W, 33 kHz) and compared with that of static control dyeing process. The data of dye uptake in leather have been analysed using Freundlich and Langmuir adsorption isotherms. Intra Particle diffusion model has been employed to calculate Intra particle diffusion rate constant and Boundary Layer effect. Diffusion coefficient (D) of dye through leather matrix has also been calculated. Kinetics of leather dyeing process has been studied through pseudo first and second order rate equation. The Freundlich constant (Kf), Langmuir parameter (Qm), Intra Particle diffusion rate constant (Kd) Apparent Diffusion coefficient (D) and Pseudo First order kinetic constant, K1 have been calculated to be 18.67 mg/g, 50 mg/g, 0.006 min-1, 1.89 * 10-6 cm2/s and 1.7 mg/g min0.5 respectively for ultrasound assisted leather dyeing as compared to that of 0.1 mg/g, 26.67 mg/g, 0.733 min-1, 0.19 * 10-6 cm2/s and 0.003 mg/g min0.5 respectively for control process. The results indicate that significant enhancement in adsorption capacity with more favorable dye adsorption as well as about 10- fold increase in Apparent Diffusion coefficient with significant reduction in boundary layer effect, improved kinetic parameters due to the use of ultrasound in leather dyeing as compared to control. Mechanisms for enhancement in Adsorption and Kinetic Parameters in leather dyeing due to the use of ultrasound have been presented and corroborate well with better dye penetration, color value and fastness properties. Therefore, the present study demonstrates that the use of ultrasound in leather dyeing helps both in adsorption of dyes as well as diffusion process through the leather matrix. Note de contenu : - INTRODUCTION : Novelty of the present work
- EXPERIMENTAL : Ultrasonic experimental set-up - Materials and methods - Analysis of acid red dye
- RESULTS AND DISCUSSIONS : Adoption isotherm - Intra particle diffusion model - Diffusion coefficient in leather dyeing - Kinetic constants in leather dyeing - Mechanisms for enhancement in adsorption and kinetic parameters in leather dyeing due to the use of ultrasoundDOI : https://doi.org/10.34314/jalca.v115i7.3834 En ligne : https://drive.google.com/file/d/1OGWRbzN7QUB-aQY6ZXbm_whWvwnOXx3p/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=34325
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXV, N° 7 (07/2020) . - p. 239-247[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 21879 - Périodique Bibliothèque principale Documentaires Disponible
[article]
Titre : Innovations in leather dyes Type de document : texte imprimé Auteurs : Andrea Zamponi, Auteur Année de publication : 2002 Article en page(s) : p. 79 Langues : Anglais (eng) Catégories : Colorants
Cuirs et peaux -- TeintureIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The demands made on the heat resistance, lightfastness and moisture resistance of dyes at the high-quality end of the market are continually increasing. In addition, leather dyes also have to fulfil a variety of ecological and toxicological requirements as shown in Fig. 1.
In order to satisfy demands from the high quality sector, innovative dye manufacturers have to address three key matters :
1. the links that exist between the chemical composition and fastness of each dye have to be investigated,
2. production processes need to be optimised and implemented to ensure that dyes are free of by-products that have a detrimental effect on their fastness,
3. new dyes have to be developed in order to establish a completely new benchmark for performance if the desired standards of fastness cannot be met on the basis of existing dye chemistry.Note de contenu : - Effects of manufacturing by-products on dye performance
- Fig. 1 : Ecological demands on leather dyes
- Fig. 2 : Production, plant for dyes at BASF AG, Ludwigshafen
- Fig. 3 : Luganil Black AS Liquid is a succcessful example of a newly developed dye which has excellent resistance to migration, as well as excellent wet fastness and lightfastness
En ligne : https://drive.google.com/file/d/1InZeIRHoTsROP5jEhfqqVzr_idPKauop/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32280
in WORLD LEATHER > Vol. 15, N° 6 (10/2002) . - p. 79[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 006181 - Périodique Bibliothèque principale Documentaires Disponible Innovative application of dye ligant-attached nanoparticles for bating / Safiye Meric Acikel in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 103, N° 2 (03-04/2019)
[article]
Titre : Innovative application of dye ligant-attached nanoparticles for bating Type de document : texte imprimé Auteurs : Safiye Meric Acikel, Auteur ; Ahmet Aslan, Auteur ; Sinan Akgöl, Auteur Année de publication : 2019 Article en page(s) : p. 65-73 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Confitage Le confitage est une action biochimique effectuée au moyen de produits enzymatiques, qui a pour but de dégrader les fibres élastiques, contribuant ainsi à augmenter la souplesse du cuir. En outre, les enzymes complètent la dégradation des résidus épidermiques, donnant ainsi une fleur plus propre et plus lisse.
Cuirs et peaux -- Propriétés physiques
Cuirs et peaux -- Teinture
Cuirs et peaux de moutons
Eaux usées -- Analyse
EnzymesUne enzyme est une protéine dotée de propriétés catalytiques. Pratiquement toutes les biomolécules capables de catalyser des réactions chimiques dans les cellules sont des enzymes ; certaines biomolécules catalytiques sont cependant constituées d'ARN et sont donc distinctes des enzymes : ce sont les ribozymes.
Une enzyme agit en abaissant l'énergie d'activation d'une réaction chimique, ce qui accroît la vitesse de réaction. L'enzyme n'est pas modifiée au cours de la réaction. Les molécules initiales sont les substrats de l'enzyme, et les molécules formées à partir de ces substrats sont les produits de la réaction. Presque tous les processus métaboliques de la cellule ont besoin d'enzymes pour se dérouler à une vitesse suffisante pour maintenir la vie. Les enzymes catalysent plus de 5 000 réactions chimiques différentes2. L'ensemble des enzymes d'une cellule détermine les voies métaboliques qui peuvent avoir lieu dans cette cellule. L'étude des enzymes est appelée enzymologie.
Les enzymes permettent à des réactions de se produire des millions de fois plus vite qu'en leur absence. Un exemple extrême est l'orotidine-5'-phosphate décarboxylase, qui catalyse en quelques millisecondes une réaction qui prendrait, en son absence, plusieurs millions d'années3,4. Comme tous les catalyseurs, les enzymes ne sont pas modifiées au cours des réactions qu'elles catalysent, et ne modifient pas l'équilibre chimique entre substrats et produits. Les enzymes diffèrent en revanche de la plupart des autres types de catalyseurs par leur très grande spécificité. Cette spécificité découle de leur structure tridimensionnelle. De plus, l'activité d'une enzyme est modulée par diverses autres molécules : un inhibiteur enzymatique est une molécule qui ralentit l'activité d'une enzyme, tandis qu'un activateur de cette enzyme l'accélère ; de nombreux médicaments et poisons sont des inhibiteurs enzymatiques. Par ailleurs, l'activité d'une enzyme décroît rapidement en dehors de sa température et de son pH optimums.
Microscopie électronique à balayage
Polyméthacrylate d'hydroxyéthyle
Tannage au chromeIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : In the present work, poly (2-hydroxy ethyl methacrylate) nanoparticles (PHEMA-RR120) attached to Reactive Red 120 were synthesised as an adsorbent for use in the acidic bating process. PHEMA nanoparticles were first derived by emulsion polymerisation without the use of a surfactant. The dye ligand Reactive Red 120 was chemically attached to the PHEMA nanoparticles via a nucleophilic substitution reaction. The bating process of sheep leathers was then carried out separately with PHEMA-RR120 nanoparticles in place of an acidic protease at pH4.5 and pH6 and in place of an alkali protease at pH8 and pH6 to remove globular proteins from among the leather fibres. According to the results, at pH4.5 the COD, BOD, ammonia and nitrogen values of the acidic protease were respectively 9560mg/L, 4550mg/L, 69.1mg/L and 3.8mg/L, while the wastewater values of PHEMA-RR120 nanoparticles were respectively 9003mg/L, 4300mg/L, 66.8mg/L and 3.70mg/L. At pH8, the COD, BOD, ammonia and nitrogen values of alkaline protease were respectively 1543mg/L, 860mg/Le, 95.3mg/L and 8.9mg/L, while the wastewater values of PHEMA-RR120 nanoparticles were respectively 1257mg/L, 666mg/L, 95.7mg/L and 7.9mg/L. Note de contenu : - MATERIALS AND METHODS : Preparation of PHEMA-RR 120 nanoparticles - Bating processing
- LEATHER WASTEWATER ANALYSIS : Physical properties of the leather
- RESULTS AND DISCUSSION : Wastewater analysis - Physical properties of the leathers
- Fig. 1 : SEM results of leathers PHEMA-R120 and enzyme in pH4.5 after acidic bating
- Fig. 2 : SEM results of leathers PHEMA-RR120 and enzyme in pH6 after acidic bating
- Fig. 3 : SEM results of leathers PHEMA-RR120 and enzyme in pH8 after alkaline bating
- Fig. 4 : SEM results of leathers PHEMA-RR120 and enzyme in pH5 after alkaline bating
- Table 1 : Raw sheepskin treatment recipe
- Table 2 : Pickled sheepskin treatment recipe
- Table 3 : Wastewater analysis results of alkaline bating and chrome tanning processes
- Table 4 : Wastewater analysis results of acidic bating and chrome tanning process
- Table 5 : Results of physical properties after alkaline batingEn ligne : https://drive.google.com/file/d/1dAsz1D37KAG_9gLV10z9_TalSduXh7zb/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32302
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 103, N° 2 (03-04/2019) . - p. 65-73[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20855 - Périodique Bibliothèque principale Documentaires Disponible Investigation of tartaric acid-copper sulphate mixture as a light stabilizer in leather dyeing / N. H. El-Sayed in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 4 (07-08/2003)
PermalinkInvestigation of the influence of tanning fatliquoring preparations on collagen by infrared spectroscopy / Anita Przepiórkowska in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 86, N° 4 (07-08/2002)
PermalinkIs deamidation bad for chromium-free ? / Karl Flowers in INTERNATIONAL LEATHER MAKER (ILM), N° 35 (05-06/2019)
PermalinkKotaï, du cuir indigo dont la teinture rime avec nature / Juliette Sebille in LEATHER FASHION DESIGN (LFD), N° 1 (02/2019)
PermalinkLeather dressing dyeing & finishing / D. Woodroffe / Teignmouth [England] : Quality Books (1953)
PermalinkLignin based colorant : modified black liquor for leather surface coating application / P. Balasubramanian in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXIII, N° 10 (10/2018)
PermalinkLime-free unhairing : Part 5. Some peculiarities of dyeing lime-free leather / A. Zaliauskiene in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 90, N° 2 (03-04/2006)
PermalinkLiquid dyestuffs / H. Träubel in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXXIV (Année 1989)
PermalinkPermalinkPermalinkManufacture of exotic leather and small leather goods from ovine stomach / Peris N. Wainaina in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVII, N° 5 (05/2022)
PermalinkMeasurement of colour difference in the leather dyeing process with natural dyes in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 87, N° 1 (01-02/2003)
PermalinkUne méthode simple de la détermination de la solidité de la teinture d'un cuir / W. Fischer in TECHNICUIR, N° 7 (11/1973)
PermalinkMicrowave and ultrasound assisted reduction of a benzidine based bis azo dyed leather / Farman Ahmed in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 104, N° 6 (11-12/2020)
PermalinkModern researches in leather dyeing / Samir Dasgupta in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 60 (Année 1976)
Permalink