Cassette single facer has been in use since the 1960s when the cardboard production industry was still in the manual stage. The design of the cassette single facer at the time was characterized by an angled roll arrangement with the pressure roll on top.

This arrangement of cassette single facers stems from the use of "guide claws". During the gluing process, the guide claws help the formed corrugated core paper to approach the middle roll (upper corrugating roll), and the inclined roll arrangement is designed to facilitate the operator to access the guide claws and rolls located above the glue tray so that the height of the entire bridge can be reached. Keep it relatively low to facilitate manual feeding of the wet end.
By the 1980s, most companies began to use the vertically aligned roller design cassette single facer, most of which placed the pressure roller on top.
Due to the high energy consumption and low technical threshold of the asset single facer at that time, the single facer was only a supplement to the corrugated paper production line. The single-sided machine is used in the processing and production of some small-sized, low-grade, domestic cartons. In the future, with the gradual promotion of green printing, single-sided machines with low energy and high consumption will definitely withdraw from the stage of history, and the new generation of single-sided machines will be improved and upgraded.
Through the above introduction and analysis of the development history of the cassette single facer, hope it helps you.