Characterization of the spray droplets and spray pattern by means of innovative optical microscopy measurement method with the high-speed camera

Koračin, Nejc (avtor), Zupančič, Matevž (avtor), Vrečer, Franc (avtor), Hudovornik, Grega (avtor), Golobič, Iztok (avtor)

Liquid atomization plays an important role in the manufacturing of the pharmaceutical products. It is used in all production steps where liquid is applied. In some productions steps precise control over spraying parameters is essential. These steps include fluid bed granulation, film coating of tablets and pellet coating. Precise atomization of liquids enables control over the granule formation in granulation steps and film formation in coating steps. Atomization process includes breakup of liquid and formation of droplets, which is a complex and important phenomenon that should be carefully evaluated for each particular use. This study focuses on characterization of atomization process by the means of combining high-speed imaging, optical microscopy and continuous backlight illumination together with robust image processing algorithm. With pure water and three different hypromellose (HPMC) polymer dispersions that are frequently used for film coating of solid dosage forms, we successfully measured mean droplet size (Sauter mean diameter between 49 and 413 μm), droplet size distribution and droplet speed (in average 10–46 m/s). It was shown that the shape of cumulative volumetric droplet size distribution can be used to evaluate the successfulness of ligament breakup (i.e., formation of droplets) and by that the spray quality. Moreover, the obtained trends and empirical correlations between droplet size and other process parameters are useful in practice in order to select appropriate settings for optimal coating process parameters. Due to the simplicity of proposed method and data processing, the entire system is potentially suitable for near real-time coating monitoring and for rapid optimization of the atomization process.

• Jezik: Angleški jezik
• Ključne besede: film coating, atomization process, image processing, microscopy, high-speed image acquisition, pharmaceutics
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FS - Fakulteta za strojništvo ; FFA - Fakulteta za farmacijo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2022
• Št. strani: 8 str.
• Številčenje: Vol. 629, art. 122412
• PID: 20.500.12556/RUL-142769
• UDK: 615:66.02
• ISSN pri članku: 0378-5173
• DOI: 10.1016/j.ijpharm.2022.122412
• COBISS.SI-ID: 130835715
• Datum objave v RUL: 24.11.2022

Gradivo je del revije

• Naslov: International journal of pharmaceutics
• Skrajšan naslov: Int. j. pharm.
• Založnik: Elsevier
• ISSN: 0378-5173
• COBISS.SI-ID: 3087631

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: filmsko oblaganje, proces atomizacije, strojna obdelava slik, mikroskopija, hitrotekoče zajemanje slik, farmacevtika

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P2-0223
• Naslov: Prenos toplote in snovi

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: J2-2486
• Naslov: Izboljšan prenos toplote pri vrenju z uporabo hierarhičnih funkcionaliziranih površin (eHEATs)