| 摘要 |
A process for coating printed circuit boards by means of coating rolls with a coating which may be cross-linked by electromagnetic radiation, preferably UV radiation, is characterised by the following steps: a photopolymerisable, fusible, low-molecular coating which is highly visquous to solid at room temperature and has a mean molecular weight preferably from 500 to 1500 is melted and supplied to the applicator roll (1) of a roll coating installation; the coating is applied on the printed circuit board surface(s) at a temperature from 60 DEG C to 110 DEG C with approximately 1000 to 20 000 mPas viscosity and 10-200 mu m thick; the surface to be coated of the printed circuit board (L) is preheated (8) before coating up to a temperature 10 DEG C to 50 DEG C higher than the temperature at which the coating is applied. A device (10) for carrying out this process is also disclosed. |
