Single facer and corrugating roll pair exchanging method therefor

A single facer for producing a plurality of types of single-faced corrugated paperboard sheets having different flute configurations, comprising:

• a plurality of corrugating roll pairs;
• a plurality of cartridges each pivotally supporting a pair of corrugating rolls arranged in an up-down direction in a respective one of the corrugating roll pairs, each of the cartridges being selectively serving as an operational cartridge supporting one of the corrugating roll pairs located in an operational position where one type of single-faced corrugated paperboard sheet is produced, and a rest cartridge supporting one of the corrugating roll pairs located in a rest position where no single-faced corrugated paperboard sheet is produced;
• and
• a single facer body having a frame structure internally formed with a transfer space for the cartridges,
• wherein the operational cartridge is disposed above the rest cartridge in such a manner that the operational cartridge is supported from therebelow by the rest cartridge.