19 May 2003 Cleaning of parts for precision-optic and glass substrates before coating
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The state of the art cleanliness of substrate surfaces prior to a coating process is decisive for its success. Any contamination of the surface affects the adhesion of the coating and leads to defects. The degree of cleanliness of the surface can not be expressed in numerical terms and can only be demonstrated by the use of suitable aids. The objective sought is "freedom from residues" and "freedom from particles", as perfectly as possible. Uniform, reproducible quality is indispensable, even when the products supplied from the preceding stages of manufacture vary within relatively wide tolerances in terms of shape, size, nature and degree of contamination. The solution to this type of problem requires well-tried process technologies in user-friendly equipment which operates safely and economically. One well-tried cleaning procedure prior to coating is based on cleaning with aqueous solutions plus ultrasound, followed by drying. In the course of today's increasing awareness of environmental matters, processes which make use of solvents prior to coating have meanwhile disappeared completely from factories. Cleaning in aqueous solutions is carried out in accordance with precise cleaning mechanisms. Cleaning is always a multistage process, in which cleaning and rinsing stages alternate repeatedly. Modern multi-chamber cleaning plants are to be found in the optical and electronics industries and fine mechanics as well as in the high-vacuum coating area. (coated lenses and hard coating)
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J. Strobel, J. Strobel, } "Cleaning of parts for precision-optic and glass substrates before coating", Proc. SPIE 10314, Optifab 2003: Technical Digest, 103140Z (19 May 2003); doi: 10.1117/12.2284024; https://doi.org/10.1117/12.2284024

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