| 摘要 |
An inexpensive processless method using a laser plotter for producing photomasks which are useful in other pre-press processes such as the preparation of offset plates and silk screens. The method provides additional uses for expensive plotters, and is useful in creating pre-press proof-reading for digitally imaged flexography plates. In a preferred embodiment, exposed conventional negative film which is completely blackened by silver deposits and has been conventionally processed is placed in a laser plotter, and imaged by ablating away the silver. The resulting film needs no further processing. Alternatively, positive film, which is already black may be processed and imaged without exposure. The ablated exposed film is useful as a mask for any type of printing plate which uses film as an intermediate material, including preparation of offset plates, silk screens, PCBs (printed circuit boards), or even conventional flexography plates. Additionally, the ablated exposed film may then be used for other purposes, making the laser plotter even more economical. The film can be used either to inspect the image visually or to produce a proof color copy. |
