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Titre : An appreciation of rollercoating Type de document : texte imprimé Année de publication : 2005 Article en page(s) : p. 37-41 Langues : Anglais (eng) Catégories : Cuirs et peaux -- Finition
Enduction au rouleauIndex. décimale : 675 Technologie du cuir et de la fourrure Résumé : The technology of finishing leather by rollercoating has now been under development for some thirty years, having originally been transferred from industries coating rigid, board-like materials. The huge advantage of rollercoating over spraying of finishing pigments, oils and lacquers is in economy of application—a rollercoater only applies the finish to the leather surface, and virtually none is lost or wasted. The continuous development of machinery and finishing chemicals now enables us to use rollercoaters to finish the softest, thinnest leathers produced, both in 'synchro' and 'reverse' coating, for impregnation, base pigment coating, design printing and final lacquering ; in fact, we are now at the point of being able to carry out all these operations with a single, multi-purpose machine.
Let us briefly review the basic principles of rollercoating machinery as used in the leather industry. Pigment, oil or lacquer is applied to a rotating cylinder with an engraved pattern that can `carry' a thin film of the material. Excess material is wiped from the engraved surface by an angled sprung doctor blade, which also serves to form a small reservoir of material against the rotating cylinder. The coating material is pumped to this reservoir, normally by a pneumatic diaphragm pump, and overflows via weirs and catchment trays at each end back to the material container. Leather is carried beneath the engraved cylinder by a rubber roller or a rubber conveyor belt, so positioned as to give a very small clearance beneath the engraved cylinder. When the leather passes through this 'nip' point, material is transferred from the surface of the engraved cylinder onto the surface of the leather.Note de contenu : - Coping with soft leathers
- Sophisticated accuracy
- Fig. 1 : A multi-purpose synchro and reverse rollercoater for sides and skins
- Fig. 2 : Synchro coating
- Fig. 3 : Synchro coater with three engraved rollers in rotary turnet
- Fig. 4 : Engraving pattern of a synchro coating roller
- Fig. 5 : Reverse coating
- Fig. 6 : Original engraving pattern of a reverse coating roller
- Fig. 7 : A whole hide reverse rollercoater
- Fig. 8 : Introduction conveyor unit, withdrawn from reverse rollercoater
- Fig. 9 : Engraving pattern of helically grooved reverse coating roller
- Fig. 10 : Three whole hide reverse rollercoaters with driers, linked into a continuous production line
- Fig. 11 : Synchro rollercoater with twelve rollers on rotary turret
- Fig. 12 : Whole hide multi-purpose rollercoater with automatic changeover from synchro to reverse coating
- Fig. 13 : Multi-purpose rollercoaterEn ligne : https://drive.google.com/file/d/1MLiReWJAh1b7NhVzYG0QVvXvRIoaNkkn/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32466
in WORLD LEATHER > Vol. 18, N° 4 (06-07/2005) . - p. 37-41[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 006184 - Périodique Bibliothèque principale Documentaires Disponible Analysis of influencing parameters in deformable roll coating of counter-rotating rolls / Bettina Grashof in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 1 (01/2015)
[article]
Titre : Analysis of influencing parameters in deformable roll coating of counter-rotating rolls Type de document : texte imprimé Auteurs : Bettina Grashof, Auteur ; Antonio Delgado, Auteur Année de publication : 2015 Article en page(s) : p. 63-73 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse mathématique
Caoutchouc
Déformations (mécanique)
Enduction au rouleauIndex. décimale : 667.9 Revêtements et enduits Résumé : Roll coating is a comparatively simple and common technology for coating of continuous substrates like paper, coils, or foils, where the fluid is metered through the gap between two rolls. Rolls wrapped with a deformable rubber layer enable a precise metering for low fluid amounts and lead additionally to higher process stability. Many efforts have been made to investigate the influencing factors of deformable roll coating by experimental and numerical methods. Beside configurations with positive gaps, which are comparable to rigid roll setups, negative gaps, where only the elasticity of the rubber layer prevents overlapping of the rolls, are of interest as such configurations enable thin liquid layers. The main influencing factors on the volume flow rate through the gap are viscosity, average velocity, effective radius, Young’s modulus, load or pre-set gap height, and partly rubber thickness, when an influence of the layer height is assumed. The dependency is often given in empirically or numerically based power law relationships. In contrast to this, in the present study, an analytically based solution is used to investigate the influencing factors in deformable roll coating with negative gaps. This continues the authors' previous work, in which the analytical solution was derived. As a result, a general agreement with numerical and experimental results from literature is found. Additionally, the analytical approach allows for the first time the ability to quantify further trends. The proposed power law exponent for the dimensionless load and elasticity numbers from literature cannot be considered as constant in the whole common application range of roll coating but remarkable trends appear. Additionally, a new criterion for the critical rubber cover thickness is developed analytically which describes the limit value of the negligible influence of the rubber cover thickness on the volume flow rate. The present investigation enables the explanation of different literature results and offers a more general view in the understanding of roll coating processes. Note de contenu : - THEORETICAL MODEL AND SOLUTION METHOD
- RESULTS OF ANALYTICAL PREDICTIONS : Scope of application - Influence of load - Influence of elasticity number - Influence of the rubber cover thicknessDOI : 10.1007/s11998-014-9629-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9629-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=23207
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 1 (01/2015) . - p. 63-73[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 16952 - Périodique Bibliothèque principale Documentaires Disponible Blotching in roll coating / A. W. Mix in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 1 (01/2011)
[article]
Titre : Blotching in roll coating Type de document : texte imprimé Auteurs : A. W. Mix, Auteur ; Z. B. Chen, Auteur ; L. M. Johnson, Auteur ; A. Jeffrey Giacomin, Auteur Année de publication : 2011 Article en page(s) : p. 67-74 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Elastohydrodynamique
Enduction au rouleau
Matières plastiques -- Thermoformage
Résistance aux tachesIndex. décimale : 667.9 Revêtements et enduits Résumé : After thermoforming, plastic parts are stacked for shipping, and these parts tend to stick together. Called nesting, sheet stock is often first coated with a silicone compound before thermoforming to prevent this. The coating usually consists of a small amount of lubricant dispersed in a majority of carrier fluid, and this fluid must then dry before reaching the sheet winder or else the coating blotches. This coupling of coating and drying to determine when to expect blotching is examined. Roll coating involves a dimensionless group called the elasticity number that governs the thickness of the coating to be dried. The drying section involves the evaporation of the coating carrier fluid, and then diffusion into the dry surrounding atmosphere. When analyzing the drying, a new dimensionless group that governs blotching is discovered, called blotchability. The result of this analysis allows practitioners to determine which operating conditions cause blotching, and how to eliminate it. Roll coating uses a deflecting rubber roll to apply vanishingly thin coatings (≤1 μm), an interesting elastohydrodynamic problem. Note de contenu : - Avoiding applicator flooding
- Metering roll
- Applicator roll
- Avoiding blotching
- Blotching and elasticity numberDOI : 10.1007/s11998-010-9282-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9282-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10924
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 1 (01/2011) . - p. 67-74[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012853 - Périodique Bibliothèque principale Documentaires Disponible Computer modeling simulates forward roll coating process / Patrick Finney in ADHESIVES AGE, Vol. 38, N° 5 (05/1995)
[article]
Titre : Computer modeling simulates forward roll coating process Type de document : texte imprimé Auteurs : Patrick Finney, Auteur Année de publication : 1995 Article en page(s) : p. 30-32 Langues : Américain (ame) Catégories : Adhésifs sensibles à la pression
Enduction au rouleau
Fluides, Mécanique des
Logiciels
Rhéologie
Simulation par ordinateurIndex. décimale : 667.9 Revêtements et enduits Résumé : Fluid flow modeling software can simulate the forward roll coating process. Results from a model produced by Dow Corning engineers correlated closely with experimental measurements on a laboratory coater. The approach can help validate the performance of materials in new applications. En ligne : https://drive.google.com/file/d/1t_r-x2NoXx5Cj33afJ3zZzeiZkY1wfOW/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=20646
in ADHESIVES AGE > Vol. 38, N° 5 (05/1995) . - p. 30-32[article]Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 001052 - Périodique Bibliothèque principale Documentaires Exclu du prêt Développement d'une métrologie temps réel visant à caractériser les instabilités d'écoulement d'un procédé d'enduction / S. Misirlilar in LES CAHIERS DE RHEOLOGIE, Vol. XIII, N° 4 (04/1996)
[article]
Titre : Développement d'une métrologie temps réel visant à caractériser les instabilités d'écoulement d'un procédé d'enduction Type de document : texte imprimé Auteurs : S. Misirlilar, Auteur ; R. Huchon, Auteur ; N. E. El Bounia, Auteur Année de publication : 1996 Article en page(s) : p. 389-398 Note générale : Bibliogr.
Langues : Français (fre) 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.
Enduction au rouleau
Enveloppes -- Collage
Films adhésifs
Mesure
RhéologieIndex. décimale : 532.05 Mécanique des fluides et des liquides - Dynamique (cinétique et cinématique) Résumé : Le procédé d'enduction par cylindre, utilisé dans l'industrie du collage des enveloppes, présente un inconvénient majeur: l'épaisseur du film d'adhésif déposé sur le substrat est irrégulière. Ce phénomène est dû à la forme "ondulée" de la surface du fluide en écoulement. Les différentes études menées sur le sujet, tant expérimentales que théoriques, montrent que les prédictions des épaisseurs de films ne tiennent pas compte de leur non-uniformité. Un dispositif expérimental nouveau est proposé: la caractérisation du profil de l'écoulement est réalisée in situ au moyen d'un procédé d'analyse d'images effectuée en temps réel. Note de contenu : - INSTABILITÉ DE L'IMPRIMEUR
- MONTAGES EXPÉRIMENTAUX : Prototype d'enduction - Chaîne de mesurePermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=25917
in LES CAHIERS DE RHEOLOGIE > Vol. XIII, N° 4 (04/1996) . - p. 389-398[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 002118 - Périodique Bibliothèque principale Documentaires Disponible Enduction transfert de silicones / Bertrand Bordes in TEXTILES A USAGES TECHNIQUES (TUT), N° 64 (06-07-08/2007)
PermalinkFrom low grade leather to high specification fashion article taking the environment friendly road / Carla Cattaneo in WORLD LEATHER, Vol. 6, N° 5 (08-09/1993)
PermalinkLeather finishing by precision roll coating / William C. Prentiss in JOURNAL OF THE AMERICAN LEATHER CHEMISTS ASSOCIATION (JALCA), Vol. LXXIII (Année 1978)
PermalinkA method to model web trajectory and release in forward roll coating / Harrison Gates in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 14, N° 5 (09/2017)
PermalinkMulti-layer coating for conductive textiles with drying via NIR-technology / Evelyn Lempa in TECHNICAL TEXTILES, Vol. 65, N° 4 (10/2022)
PermalinkProcess limits in two-layer reverse roll transfer / M. Sasaki in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 4 (07/2013)
PermalinkRhéologie des peintures et procédé de couchage au rouleau / Olivier Cohu / 1995
PermalinkSlot die coating of lithium-ion battery electrodes : investigations on edge effect issues for stripe and pattern coatings / Marcel Schmitt in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 1 (01/2014)
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