A coating apparatus for batches of elongate flimsy members includes batch handling portion and a coating portion. The firewall employs \u201cenvoys\u201d that exhibit the security robustness of prior-art proxies and the transparency and ease-of-use of prior-art packet filters, combining the best of both worlds. The packaged IC chip is electrically coupled to the OSA through at least one microwave via extending through the board and a conductive trace formed on the opposed bottom surface of the board. The actuating unit will be driven to allow the tray to be pushed to swing up by the elastic unit for blocking documents. Coatings made with sorbitol or xylitol or gum centers that include sodium bicarbonate are particularly preferred. The second gear and the first gear are meshed with each other so that the second gear can drive and rotate the first gear to adjust the relative distance between the casing and the bottom of the cylinder.