Application of high intensity air-borne ultrasound for debubbling liquid coating layers.
In the coating processes, the formation of bubbles and microbubbles is relatively frequent inside the coating layer. Such bubbles, which are formed as a consequence of air retention, are difficult to remove and specifically in high-speed (quick-drying) industrial application where they cause permanent imperfections in the homogeneity of the layer. High-intensity air-borne ultrasound may represent a clean means to improve homogenization by quickly breaking the bubbles just when they are formed inside the coating film. This paper deals with the direct application of air-borne high-intensity ultrasonic radiation at a frequency of about 21 kHz over coating layers just immediately they have been deposited over wood substrates. Such novel process has been implemented and experimentally studied at laboratory and semi-industrial stages.
González
I
I
Instituto de Acustica, CSIC, Serrano, 144, 28006 Madrid, Spain.
Rodríguez
J
J
Garmendia
I
I
Gallego-Juárez
J A
JA
D020099:Coated Materials, Biocompatible / Q000737:chemistry* / Q000528:radiation effects*; D004866:Equipment Contamination / Q000517:prevention & control*; D005740:Gases / Q000737:chemistry* / Q000528:radiation effects*; D045423:Microbubbles; D012996:Solutions; D013010:Sonication
D020099:Coated Materials, Biocompatible; D005740:Gases; D012996:Solutions