Patent ID: 7423242

Claim:
An oven for non-metal melting with a. a housing ( 2 ) enclosing an interior ( 3 ), b. at least one mould ( 9 ) arranged in the interior ( 3 ) for receiving a non-metal melt ( 24 ), c. at least one electrical heating device ( 12 ) enclosing at least partially the at least one mould ( 9 ) for influencing the temperature of the non-metal melt ( 24 ), and d. a power supply device ( 16 ) coupled in an electrically conductive manner to the at least one heating device ( 12 ) for supplying the heating device ( 12 ) with a time-variable current I(t), wherein i. the current I(t) has a frequency of 0.1 Hz to 1000 Hz and ii. the current I(t) is of a magnitude suitable for setting a predetermined temperature of the non-metal melt ( 24 ).