The operation of the single roll bundler SRB-12 is completely automatic and includes all features for transferring, upending, collating and over-wrapping packs of bathroom tissue and kitchen towels in neat, tight, completely sealed bundles as secondary packaging for transport and distribution. Packs/rolls are coming from the wrapper /log saw in one lane to the servo controlled diverter which sorts the packs into max 5 channels and at the same time separate 2 rolls in each lane! Further, the packs are transferred to the upending section in order to set the core in vertical position. Upending section transfer rolls directly to elevator in 2 layers. The servo-controlled pusher drives the arranged pack formation into the tube and throughout the folding and cross sealing section. At the same time a non-contact continuous hot air blow secures the top seal. Lap sealing unit provides strong cross seal at high speed. Foil is coming from single center-folded polyethylene reel.