Stacks of good sheets.

When setting up the press, after rubber blanket washing or when a pallet is changed: sometimes paper waste is unavoidable. In the packaging print sector in particular, where even extremely minor defects are unacceptable, defective sheets need to be detected accurately and rejected reliably. The Heidelberg paper waste ejection feature supports print shops by providing a fully-automatic process. In accordance with the principle of “eliminating defects where they arise”, the Speedmaster XL 106 rejects paper waste during the production run – and with up to 18,000 sheets per hour. “The ejection feature operates accurately to the sheet, it also works with every material and at any speed,” explains Axel Koppey, XL 106 Product Manager at Heidelberg. “The entire process is thus more efficient and the results are higher in quality.” This is because the imperfect sheets do not reach delivery/postpress in the first place. Manual sorting, whereby a poor quality sheet can end up on the good quality stack or in the die-cutter despite markings, is a thing of the past.

Two high-resolution color cameras reliably detect even the smallest print errors.

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Top performance when it comes to sheet inspection.

Prompt detection of printing defects is ensured by the Prinect Inspection Control 2 inspection system with two high-resolution color cameras. It is fully integrated into the coating unit and is therefore optimally protected against dust and splash water.

The system automatically generates a digital reference sheet once production of good sheets begins, and compares every sheet with it inline. The system detects the smallest defects, such as hickeys, missing print, streaks, smudging and scumming, in real time. If required, it activates the paper waste drum which reliably removes the defective sheets from the production line via a gripper.

Furthermore, the printer is free to determine other parameters for each print job, for example to make sure that the sheet is automatically rejected in the event of a pull error. This is advisable, especially for the immediate disposal of paper waste. “The flexible handling reduces the workload on the operator and improves efficiency,” explains Koppey. However, with expensive materials, the Speedmaster XL 106 can be configured so as to ensure that defective sheets are marked by a tape inserter. Individual repeats are then only rejected once they reach the folder gluer, for example.

The paper waste ejection feature therefore supports “ zero defect production ”, which is a Heidelberg value proposition. “Automatic checking and rejection make the production chain leaner and reduce manual intervention. Packaging printers can thus deliver premium quality and eliminate complaints, with less work,” summarizes Koppey.

Talk to our expert.

Do you have any questions or would you like to find out more about the paper waste ejection feature?
axel.koppey@heidelberg.com

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