Journal ArticleDOI
Manufacture of Powder Coatings by Spraying of Gas-Enriched Melts
TLDR
In this paper, the solubility of compressed gases in melts of coating polymers at pressures up to 220 bar is exploited for the manufacture of powder coatings, which is applicable to new (lowmelting and fast-reacting) and conventional powder coating systems and allows to produce coatings with improved properties.Abstract:
An alternative process for the manufacture of powder coatings was developed. The continuously operated process is applicable to new (low-melting and fast-reacting) and conventional powder coating systems and allows to produce coatings with improved properties. The process uses the solubility of compressed gases in melts of coating polymers at pressures up to 220 bar. The single components of a powder coating mixture are melted in separated tanks and are dosed to a static mixer by means of high-pressure pumps. In the mixer the melts are homogenized and simultaneously compressed carbon dioxide is dissolved. The so-formed solution is depressurized directly afterwards over a nozzle into a spray tower. Thereby, the melt is atomized into fine droplets and cooled by the expanding gas. The droplets reach the solidification point of the melt and fine solid particles are formed. The particle size, particle size distribution and the morphology of the powders could be adjusted by the operating parameters of the plant.read more
Citations
More filters
Journal ArticleDOI
Supercritical carbon dioxide as a green solvent for processing polymer melts: Processing aspects and applications
TL;DR: In this paper, experimental and theoretical studies of solubility and viscosity of several polymer melts are discussed in detail, and detailed attention is also given to recently reported applications along with aspects related to polymer processing.
Journal ArticleDOI
Static Mixers in the Process Industries—A Review
TL;DR: The most commonly used static mixers are described and compared in this article, and the key parameters needed for the selection of a suitable mixer are highlighted, as well as their respective advantages and limitations.
Journal ArticleDOI
Recent developments in particle design using supercritical fluids
Alireza Shariati,Cor J. Peters +1 more
TL;DR: A review of the most recent published literature about particle design using gas anti-solvent and other SCF processes can be found in this article, where the authors present a review of particle design techniques for materials precipitation.
Journal ArticleDOI
Supercritical fluids for pharmaceutical particle engineering: Methods, basic fundamentals and modelling
TL;DR: A compilation of old and new supercritical fluid as solvent or antisolvent techniques for drug processing and their fundamentals in terms of crystallization, thermodynamics and modelling results is provided in this article.
Journal ArticleDOI
Are pharmaceutics really going supercritical
Irene Pasquali,Ruggero Bettini +1 more
TL;DR: The present work focuses on some applications of supercritical fluids in the pharmaceutical field, provides a critical review of the most recent advances and aims to give a vision on the future of this technology.
Related Papers (5)
Particle design using supercritical fluids: Literature and patent survey
Jennifer Jung,Michel Perrut +1 more
Recent developments in particle design using supercritical fluids
Alireza Shariati,Cor J. Peters +1 more