This Theisen & Bonitz TB Sprint 315 is a folding machine — sometimes referred to as a paper folder — designed to automatically fold printed sheets across a range of formats and substrates. Theisen & Bonitz is a well-established German manufacturer specialising in postpress finishing equipment, with folding machines forming a core part of their product range for the printing and finishing industries.
This used example, dating from 1991 and located in Germany, is configured with 15 folding stations plus a hand plant on the left, giving operators considerable flexibility in the number and type of folds that can be produced. At full output, the machine runs at 3,100 cycles per hour, making it a productive unit for medium-to-high volume finishing work.
The machine handles a maximum sheet format of 35 × 50 cm and a minimum of 6.5 × 10 cm, covering a practical range of common print formats. It is capable of processing substrates with grammages of up to approximately 1,000 g/m², which extends its usefulness beyond standard paper to heavier board and card stocks. The stacking height at the delivery reaches a maximum of 300 mm, allowing for reasonable batch accumulation before operator intervention is needed.
A double and missing sheet control system is fitted, providing automatic detection of mis-feeds — both double sheets and absent sheets — which helps protect the machine and maintain output quality during production runs.
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