Patent ID: 9132365
Filing Date: 2015-09-15
Classification: B01D,B05D,G02B

Abstract:
1. A method for removing air from a photochromic coating fluid containing entrained air comprising the steps of: (A) preparing a coating unit comprising a cylindrical vessel storing the photochromic coating fluid, a check valve connecting with the vessel and an outlet of the photochromic coating fluid existing downstream of the check valve, wherein the check valve prevents back flow of the photochromic coating fluid from the outlet toward the vessel by urging a valve hail against a valve seat by a spring, (B) plugging the outlet; and (C) after step (B), rotating the coating unit on an axis of the vessel and orbiting the coating unit on a revolution axis simultaneously whereby the photochromic coating fluid within the vessel presses the valve ball in opposition to the pressing force of the spring and the photochromic coating fluid enters the check valve, while air within the check valve flows into the vessel, and further removing air incorporated in the photochromic coating fluid from the photochromic coating fluid.