| 摘要 |
A method for the surface treatment of clay, ceramic or cementitious articles, especially roofing tiles, comprising providing a hardenable, water-containing mass ( 1 ) shaped in the form of the article, then covering an exposed surface area of the article with a flexible membrane ( 3 ), such as a plastics film, having an upper-surface and a smooth under-surface, such that the latter is in intimate contact with and conforms to the contours of that surface area of the article, thereby providing a membrane-covered area of the article, vibrating the membrane-covered area of the article, for example via a vibrator head ( 6 ) applied to a rigid plate ( 5 ) overlaid on the membrane, such that vibration is transmitted through the membrane, to the surface of the article, and either removing the membrane then hardening the article, or at least partially hardening the article with the membrane in place.
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