| 释义 |
vacuum frame
vacuum frame n (Printing, Lithography & Bookbinding) printing a machine from which the air is extracted in order to obtain close contact between the surfaces of two materials, e.g. the film and plate during platemaking vacuum frame
vacuum frame[′vak·yəm ‚frām] (graphic arts) In platemaking, a contact printing device that holds copy and reproduction material by means of a vacuum to attain a uniform pressure during exposure. |