Optimization of coating uniformity in a simplerotation system by using rotating shadowmask

2021 ◽  
Author(s):  
Guoyun Long ◽  
Yaoping Zhang ◽  
Junqi Fan ◽  
Guan Chunlin
Keyword(s):  
Coating Uniformity

scholarly journals Assessment of Mini-Tablets Coating Uniformity as a Function of Fluid Bed Coater Inlet Conditions

Pharmaceutics ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 746
Author(s):  
Magdalena Turk ◽  
Rok Šibanc ◽  
Rok Dreu ◽  
Maja Frankiewicz ◽  
Małgorzata Sznitowska
Keyword(s):  
Coating Layer ◽  
Spectrophotometric Analysis ◽  
Material Distribution ◽  
Spray Chamber ◽  
Colorimetric Analysis ◽  
Swirl Generator ◽  
Coating Uniformity ◽  
Fluid Bed ◽  
Inlet Conditions

This study concerned the quality of mini-tablets’ coating uniformity obtained by either the bottom spray chamber with a classical Wurster distributor (CW) or a swirl distributor (SW). Mini-tablets with a diameter of 2.0, 2.5, and 3.0 mm were coated with hypromellose using two different inlet air distributors as well as inlet airflow rates (130 and 156 m3/h). Tartrazine was used as a colorant in the coating layer and the coating uniformity was assessed by spectrophotometric analysis of solutions obtained after disintegration of the mini-tablets (n = 100). Higher uniformity of coating material distribution among the mini-tablets was observed in the case of SW distributor, even for the biggest mini-tablets (d = 3.0 mm), with an RSD no larger than 5.0%. Additionally, coating thickness was evaluated by colorimetric analysis (n = 1000), using a scanner method, and expressed as a hue value. A high correlation (R = 0.993) between inter-tablet variability of hue and UV-Vis results was obtained. Mini-tablets were successfully coated in a fluid bed system using both a classical Wurster distributor as well as a swirl generator. However, regardless of the mini-tablets’ diameter, better film uniformity was achieved in the case of a distributor with a swirl generator.

scholarly journals Improving the W Coating Uniformity by a COMSOL Model-Based CVD Parameter Study for Denser Wf/W Composites

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1089
Author(s):  
Leonard Raumann ◽  
Jan Willem Coenen ◽  
Johann Riesch ◽  
Yiran Mao ◽  
Daniel Schwalenberg ◽  
...  
Keyword(s):  
Relative Density ◽  
Gas Flow ◽  
Chemical Vapor ◽  
Process Time ◽  
Parameter Study ◽  
Reactor Model ◽  
Production Route ◽  
Coating Uniformity ◽  
Hydrogen Retention ◽  
Return Lead

Tungsten (W) has the unique combination of excellent thermal properties, low sputter yield, low hydrogen retention, and acceptable activation. Therefore, W is presently the main candidate for the first wall and armor material for future fusion devices. However, its intrinsic brittleness and its embrittlement during operation bears the risk of a sudden and catastrophic component failure. As a countermeasure, tungsten fiber-reinforced tungsten (Wf/W) composites exhibiting extrinsic toughening are being developed. A possible Wf/W production route is chemical vapor deposition (CVD) by reducing WF6 with H2 on heated W fabrics. The challenge here is that the growing CVD-W can seal gaseous domains leading to strength reducing pores. In previous work, CVD models for Wf/W synthesis were developed with COMSOL Multiphysics and validated experimentally. In the present article, these models were applied to conduct a parameter study to optimize the coating uniformity, the relative density, the WF6 demand, and the process time. A low temperature and a low total pressure increase the process time, but in return lead to very uniform W layers at the micro and macro scales and thus to an optimized relative density of the Wf/W composite. High H2 and low WF6 gas flow rates lead to a slightly shorter process time and an improved coating uniformity as long as WF6 is not depleted, which can be avoided by applying the presented reactor model.

Monte Carlo simulations to determine coating uniformity in a Wurster fluidized bed coating process

2006 ◽  
Vol 166 (2) ◽  
pp. 81-90 ◽  
Author(s):  
KuZilati KuShaari ◽  
Preetanshu Pandey ◽  
Yongxin Song ◽  
Richard Turton
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Fluidized Bed ◽  
Coating Process ◽  
Fluidized Bed Coating ◽  
Coating Uniformity

Interrelationships Between Coating Uniformity and Efficiency in Pan Coating Processes

2021 ◽  
Vol 22 (8) ◽  
Author(s):  
Michael Choi ◽  
Stuart C. Porter ◽  
Axel Meisen
Keyword(s):  
Coating Uniformity

Study of Selectively Permeable Coatings to Textiles

2011 ◽  
Vol 1312 ◽  
Author(s):  
Joseph G. Sargent ◽  
Jun S. Lee ◽  
Emmanuelle Reynaud ◽  
Michael D. Gilbert ◽  
James M. Sloan
Keyword(s):  
Electron Microscopy ◽  
Industrial Applications ◽  
Chemical Agent ◽  
Coating Materials ◽  
Water Permeation ◽  
Chemical Agents ◽  
Transmission Electron ◽  
Coated Fabric ◽  
Coating Uniformity ◽  
Electron Microscopy Analysis

ABSTRACTBreathable barrier textiles for both chemical agent and moisture are being actively developed for military and industrial applications. An ideal approach is to coat textiles with a semi-permeable film that allows the transport of water while still serving as a barrier for chemical agents. Sulfonated poly (styrene-block-isobutylene-block-styrene) (SIBS) copolymer spontaneously phase separates upon drying from solution to produce a nanostructured film with the controlled barrier functionality for water permeation and repelling of chemical agents.The objective of this research is to investigate coating uniformity and phase morphology of SIBS coating materials fabricated by novel solvent combinations. Scanning electron microscopy analysis is used for the assessment of the coating uniformity as well as the level of adhesion between the polymer coating and fabric substrate. Transmission electron microscopy is used to characterize the phase separation morphology of the SIBS copolymer coating. The mechanical behavior of the coated fabric is determined through tensile and shear tests and is compared to the bare fabric behavior. The goal of this study is to relate the processing conditions of the final nanostructured block copolymer coated fabric produced on industrial scale.

The Approach of Electrode Materials on Electroluminescent Fabric

2011 ◽  
Vol 287-290 ◽  
pp. 2618-2621
Author(s):  
Wen Hao Hsing ◽  
Ting Chuang ◽  
Pei Jing Chen ◽  
Nien Ting Lee
Keyword(s):  
Electrode Materials ◽  
Dip Coating ◽  
Surface Adhesion ◽  
Mixture Ratio ◽  
Electrode Layer ◽  
Good Surface ◽  
Coating Uniformity ◽  
Coating Method ◽  
Dip Coating Method ◽  
In The Beginning

The purpose of this study is to make an electroluminescent fabric, through the dip-coating method, use different layer materials in turns to coating on the conductive fabric, so that the final shape of the fabric can through the electroluminescence principle to achieve the effect of light on the surface. According to the dip-coating procedure, the resin materials in this study are BT2100, phosphor adding with ITK5517, ITK5517, and the outer electrode layer. To confirm the effect of dip-coating method, in the beginning of the study, for each resin material layer and electrode layer (ITO / PET, poly-3,4-ethylenedioxythiophene (PEDOT: PSS), poly-aniline (PANI)) to discussed the coating uniformity and stiffness etc. on the fabric. After the practice to be established, than estimate the polymer of the surface, it is mainly to mixed in different proportions within PEDOT:PSS and PANI, to fill up the defects of conductive interface in the coating method with PEDOT:PSS, through the good surface adhesion of PANI, than make it become more suitable electrode on the electroluminescent fabric. In experimental results, we found that dip-coating can truly achieve the uniform distribution of each sol on the fabric, to obtain better uniformity on the surface, and then the mixture ratio of PEDOT: PSS and PANI in 2:1 and 3:1 , will have the best brightness(17.38lux, 19.86lux) and light uniformity(83.5%, 85.5%).

Sign in / Sign up

Export Citation Format

Share Document