 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Gases and Vapor Permeability to Carnauba and Shellac Coatings ) ผู้เขียน: Prceda Chittarom, Jingtair SiriphanichI สื่อสิ่งพิมพ์:pdf AbstractStudy on gases and vapor permcahility to carnauha and shellac using tangerines as tested fruit showed that Oxygen and carbon dioxide permeated to carnauha readily. The internal gas composition as well as ethanol tin tent of tangerine juice were only slightly altered. However. the permeability of the gases were restricted In shellac resulting in accumulation of ethanol. On the opposite. water vapor permeated to shellac better than earnauba. Shellac reduced Water loss Only upto 3tl`o at 2Ur1- shellac concentration, while carnauha reduced w: to loss by as much as (dY2 at l 5n1: carnauha concentration. 1he properties of mixed coating were in between the properties of each material alone. I-Iowever, shellac had stronger influence than carnauha on the vapor permmeability of the mixture. Study for gases and vapor permeability, by coating both materials on silk-screen revealed that permeability depended also on the adhesion of the waxes to the coating surface. |