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Comparison of different opaque PET false-twist yarns / Dandan Xing in CHEMICAL FIBERS INTERNATIONAL, (10/2018)
[article]
Titre : Comparison of different opaque PET false-twist yarns Type de document : texte imprimé Auteurs : Dandan Xing, Auteur ; Ni Wang, Auteur ; Huyi Liu, Auteur ; Meiwu Shi, Auteur Année de publication : 2018 Article en page(s) : p. 75-77 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse spectrale
Analyse thermique
Dioxyde de titane
Fibres textiles -- Propriétés mécaniques
Fibres textiles synthétiques -- Analyse
Mélanges-maîtres (chimie)
Microscopie
Polyéthylène téréphtalate
Polymères opaques
Texturation fausse torsionCe procédé continu pour la production de fils texturés permet d'effectuer simultanément trois opérations : la torsion, la fixation et la détorsion. Le fil, provenant d'un enroulement d'alimentation, pénètre sous une tension contrôlée dans l'unité chauffant, passe ensuite dans une broche à fausse torsion ou sur une surface à friction qui est typiquement une pile de disques rotatifs appelés agrégat, puis il passe à travers un jeu de cylindres récepteurs et ensuite sur un support d'enroulement récepteur. La torsion est fixée sur le fil par l'action d'un tube à chauffage, ensuite elle est annulée au-dessus de la broche ou de l'agrégat, ce qui donne un groupe de filaments de forme hélicoïdale. Les fausses torsions de friction permettent d'atteindre des vitesses beaucoup plus élevées de transformation qu'avec les fausses torsions obtenues à l'aide de broches conventionnelles. Les fils à extensibilité élastique ainsi que les fils gonflants peuvent être obtenus par ces procédés. Les exemples de fils texturés par fausse torsion sont : Superloft®, Flufflon® et Hélanca®.Index. décimale : 677.4 Textiles artificiels Résumé : By using SEM, IR, X-ray diffraction, DSC, TG, physical and mechanical properties test, the structure and properties of 2 kinds of opaque polyester false-twist textured yarns made by masterbatch spinning and slice spinning were analysed. The results showed that TiO2 particles had better dispersion and smaller reunite in slice spinning. The infrared spectra of the 2 textured yarns are similar to that of the ordinary polyester fibers. The cristallinity of the textured yarn made by masterbatch spinning is higher than that made by slice spinning. Compared with the ordinary PET fibers, the tenacity and breaking elongation of the 2 polyester fibers are lower, while their friction coefficient are higher. At the same time, both the tenacity and the elongation at break of the textured yarns made by slice spinning are higher than those made by masterbatch spinning, however the friction coefficient is less than that of the masterbatch spinning. Note de contenu : - EXPERIMENTAL : Materials - Scanning electron microscopy (SEM) observation - Fourier transform (FT) infrared spectroscopy - X-ray diffraction (XRD) - Differential scanning calorimeter (DSC) - Thermo gravimetric analysis (TGA) - Mechanical properties measurements
- RESULTS AND DISCUSSION : Infrared spectrum analysis - Thermal analysis - Physical mechanical properties analysis
- Fig. 1 : SEM images of the fibers : Cross-section, surface, masterbatch spinning and slice spinning
- Fig. 2 : Infrared spectra of fibers : masterbatch and slice spinning
- Fig. 3 : XRD patterns of the fibers : masterbatch spinning and slice spinning
- Fig. 4 : DSC curves of the fibers : heating, cooling, slice spinning and masterbatch spinning
- Fig. 5 : Temperature dependences of weight loss for masterbatch spinning and slice spinning
- Table 1 : Thermal transition parameters of the fibers
- Table 2 : Mechanical properties of fibersEn ligne : https://drive.google.com/file/d/1ERdDSzYa6WLvwSqGkx3d3MA9jeOs3HTw/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31262
in CHEMICAL FIBERS INTERNATIONAL > (10/2018) . - p. 75-77[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 20259 - Périodique Bibliothèque principale Documentaires Disponible A comprehensive understanding on sewability of natural biomaterial : an insight on process optimization during leather manufacture / Gladstone Christopher Jayakumar in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. CXVI, N° 7 (07/2021)
[article]
Titre : A comprehensive understanding on sewability of natural biomaterial : an insight on process optimization during leather manufacture Type de document : texte imprimé Auteurs : Gladstone Christopher Jayakumar, Auteur ; K. Phebe Aaron, Auteur ; K. Krishnaraj, Auteur Année de publication : 2021 Article en page(s) : p. 233-238 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cuir -- Couture
Cuirs et peaux -- Propriétés organoleptiques
Douceur (toucher)
Essais (technologie)
Huiles et graisses
Microscopie
Phénols
Post-tannage
Rigidité (physique)
SyntansIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : Leather is three-dimensional matrix possessing unique properties which makes it more comfortable for daily use. Garments made from leathers are preferred choice owing to their multifaceted properties as compared to textiles in the colder regions. In the present study, an attempt has been made to evaluate the influence of phenolic syntan and synthetic fatliquor on the sewability and physical properties of post tanned leathers. From the experimental results, it is observed that the concentration of phenolic syntan and fatliquor influences leather sewability. Optical microscopic images of leathers also show that they are more compact and tighter with higher percentage of syntan. The study provides an insight in understanding the optimum usage of post tanning chemicals for better sewing properties without affecting the leather matrix adversely. Note de contenu : - Post tanning process
- Physical testing of leather samples
- Stiffness measurements
- Determination of softness
- Evaluation of sewability
- Evaluation of organoleptic properties
- Optical microscopic studies
- Table 1 : Post tanning process
- Table 2 : Physical characteristics of different fatliquor offered leathersDOI : https://doi.org/10.34314/jalca.v116i7.4334 En ligne : https://drive.google.com/file/d/1MFotr7GWZlmII4Wa6HWjXpdsWHw6ly7b/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36080
in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA) > Vol. CXVI, N° 7 (07/2021) . - p. 233-238[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 22869 - Périodique Bibliothèque principale Documentaires Disponible Coordinated approach to the production of soft leather / K. Smiechowski in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC), Vol. 89, N° 5 (09-10/2005)
[article]
Titre : Coordinated approach to the production of soft leather Type de document : texte imprimé Auteurs : K. Smiechowski, Auteur ; K. Beleska, Auteur ; A. Zaliauskiene, Auteur Année de publication : 2005 Article en page(s) : p. 199-203 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chaux
Cuirs et peaux
Epilage
Extraction (chimie)
Granulométrie
Huiles et graisses animales
Mesure
Microscopie
Peaux brutes -- Trempe
Souplesse (mécanique)Index. décimale : 675 Technologie du cuir et de la fourrure Résumé : Production of soft and strong leather requires a coordinated approach to all chemical and physical processing steps. The composition and nature of the fatliquors is only partly responsible for the leather’s softness. Opening up of the structure, neutralization and tanning influence the fatliquoring process and resulting leather as well.
Knowledge about the changes of the dermal structure during beamhouse processing and its impact on the reaction of fat with leather is necessary for monitoring the fatliquoring process. Two different methods of opening up of the dermal structure - ‘lime-free’ and ‘lime’ - were used in our experiments to determine the relationship between the parameters mentioned above and the fatliquoring effect.Note de contenu : - EXPERIMENTAL PROCEDURES : Unhairing trials - Fatliquoring trials - Evaluation of fatliquoring effect by extraction of fat from leather samples - Measurement of the particle size of fatliquor emulsion - Microscopy
- RESULTS AND DISCUSSIONS :
- Table 1 : Dependence of the removed collagenous and non-collagenous proteins on the method and the duration of treatment
- Table 2 : Data of fatliquor analysis
- Table 3 : Dependence of the amount of extractable and unextractable fats on the method of alkaline treatment and fatliquor propertiesEn ligne : https://drive.google.com/file/d/1LZc2tGKSwpIsdnKzFhJpnqMkcqlyunaY/view?usp=share [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39230
in JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS & CHEMISTS (JSLTC) > Vol. 89, N° 5 (09-10/2005) . - p. 199-203[article]Corrected or non-correted grain ? FILK-QMA-1201 - a method to evaluate finished leather / Haiko Schulz in WORLD LEATHER, Vol. 18, N° 2 (04/2005)
[article]
Titre : Corrected or non-correted grain ? FILK-QMA-1201 - a method to evaluate finished leather Type de document : texte imprimé Auteurs : Haiko Schulz, Auteur ; Michael Meyer, Auteur Année de publication : 2005 Article en page(s) : p. 41-44 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Cuirs et peaux -- Finition
Echantillonnage
Evaluation
Microscopie
Surfaces -- AnalyseIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : A new method is described and illustrated, which enables differentiation between finished leathers that have been corrected or not. The method is very senstive, and can readily detect leathers that have only been lightly corrected, even when the leathers have been slightly snuffed. Note de contenu : - Sample preparation
- Sample evaluation
- Microscopic analysis of the grain
- Microscopic analysis of the back-side of the finish
- Microscopic analysis of the cross-section
- Panel 1 : Definitions
- Fig. 1a : Leather surface after complete removal of the finish layer.
- Fig. 1b : Leather surface after incomplete removal of the finish layer.
- Fig. 2a : Back-side of the finish layer after removal from a corrected grain leather. No fibres remaining in the finish.
- Fig. 2b : Back-side of the finish layer after removal from a corrected grain leather. Fibres left sticking in the finish.
- Fig. 3 : Leather surface of a full grain leather after successful removal of the finish. The arrows indicate the damage-free sickle- shaped pellicles and the fine structure.
- Fig. 4 : Surface of a lightly snuffed leather after removal of the finish. Parallel cut/grind marks are a clear characteristic of correction.
- Fig. 5 : Surface of a buffed leather after removal of the finish. Truncated hair openings are observed as well as grind marks.
- Fig. 6 : Surface of a heavily buffed leather after removal of the finish. Hair openings disappear in a surface with a suede-like effect.
- Fig. 7 : Surface of a crust leather after light abrasion with buffing paper. Fine cut/grind marks can still be clearly observed.
- Fig. 8 : Back-side of a finish from a full grain leather. The mirror image of the typical grain surface is clearly observed as a result of the base coat flowing into the hair follicles.
- Fig. 9 : Back-side of a finish from a leather that was slightly corrected. The cut/grind marks are clearly visible.
- Fig. 10 : Back-side of a finish from a corrected grain leather. The cut/grind marks are clearly visible as well as the impression of leather fibres that remained adhering to the finish.
- Fig. 11 : Back-side of a finish from a leather that was stucccoed and corrected. The leater substrate was digested by enzymatic treatment.
- Fig. 12 : Cross-section of leather that was not corrected. The curvature of the hair openings is completely preserved.
- Fig. 13 : Cross-section of a corrected leather. The curvature of the hair openings has been lost. They appear truncated,ending at the boundary layer in an acute angle. Base coat penetration into fibre network.En ligne : https://drive.google.com/file/d/1UoFYIeR41eUvEfOECWGfc0ZTIU6kuUYu/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32338
in WORLD LEATHER > Vol. 18, N° 2 (04/2005) . - p. 41-44[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006182 - Périodique Bibliothèque principale Documentaires Disponible Critical view on the possibility of color changes prediction in the surfaces of painted wood exposed outdoors using accelerated weathering in Xenotest / Milos Panek in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 2 (03/2019)
[article]
Titre : Critical view on the possibility of color changes prediction in the surfaces of painted wood exposed outdoors using accelerated weathering in Xenotest Type de document : texte imprimé Auteurs : Milos Panek, Auteur ; Ladislav Reinprecht, Auteur Année de publication : 2019 Article en page(s) : p. 339-352 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Bois -- Revêtements protecteurs
Climat
Couleur
Décoloration
Essais accélérés (technologie)
Microscopie
StatistiqueIndex. décimale : 667.9 Revêtements et enduits Résumé : The capability to correlate exactly the process of outdoor natural weathering for the coating systems on wood surfaces via their artificial weathering in laboratory conditions would significantly reduce the testing times. In this work, a weathering of 16 different coating systems applied on two wood species (Norway spruce and black locust) having two different degrees of roughness (smooth, rough) was performed with the aim to compare direction and intensity of their color changes in natural exterior exposure without ground contact lasting from 6 to 36 months and in Xenotest lasting from 1 to 12 weeks, respectively. Correlation relationships between the natural and accelerated weathering of painted woods have been evaluated based on linear regressions for changing of the CIE-L*a*b* color parameters ΔL* and ΔE* and by non-linear Spearman rank correlation of ΔE* values. The results exhibit better possibilities for correlating the color changes for wood painted with pigmented coatings compared to transparent ones. The precision of the employed correlations has also been affected by the underlying wood species and its roughness before application of the coating. This means that, in the modeling of painted wood weathering, it is necessary to take into account a number of other factors in addition to the specific climatic conditions of exposure. Note de contenu : - Wood samples
- Coatings systems
- Natural and accelerated weathering
- Color analyses
- Microscopic analyses
- Statistical evaluationDOI : 10.1007/s11998-018-0125-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-018-0125-9.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32407
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