We have years of experience in retrofitting. Replacing outdated gearboxes with more powerful electronic controls significantly improves efficiency and reliability. Find out more about modernizing sheeters.

LIFETIME EXTENSION FOR MORE EFFICIENT USE OF RESOURCES

Modernization of cross-cutters

What does a sorting cross cutter do?

Paper that leaves the paper mill in the form of sheets is called format paper. For this, the smaller rolls cut from the reel still have to be cut into sheets in cross cutters, which then have to be stacked. Format accuracy plays a crucial role here. In addition to format cutting, sorting cross cutters also allow for automatic defect detection. By inspecting the incoming web with a camera system, holes, bulges and color deviations, for example, can be detected. Defective sheets are ejected by the machine as scrap.
Papers are very sensitive – many different components must be precisely coordinated and interlocked to guarantee the desired quality of the cut-to-size product. In this context, slight deviations in the cutting length and angle accuracy of the cut are of crucial importance.

How can the format of the sheet be varied? In older sheeters, the format adjustment was implemented using an adjustable gear. These gears are very complex and repair and maintenance is very expensive. With advances in power electronics, the slitter drives have been equipped with an “electronic gear”.

We have many years of experience in modernizing these gearboxes. It requires precise planning and execution by experienced specialists in drive technology. In a current project, the controls of a cross-cutter were upgraded to the latest state of the art.

The requirements

Availability of the devices used
Simple fault finding and troubleshooting by the operator
Conversion of the controls to an open system that the maintenance staff are familiar with

The core functions of a cross cutter, such as the motion control of the knife (cam disks), sheet tracking, suction slide, etc., were realized on the “black boxes”. With up to 500 cuts per minute (8.33 cuts/s), this was a real challenge in terms of dynamics.

The result

The new high-performance SIMATIC S7-1500 controllers made it possible to combine controllers as well as use a SIMATIC application for the S7-1500T CPU. This further optimized communication between the controllers and simplified the program structure. The outdated operating devices were also replaced. Expanding the status displays and error diagnostics, which enable faster problem identification and resolution, is a matter of course for KRIKO. To guarantee the functionality and performance of the modernized cross cutter, the new control system was set up in parallel with the existing system and the signals were checked.
This test showed that the KRIKO solution works, and so the focus could be shifted to the unforeseen challenges of a commissioning. Thanks to KRIKO's expertise, the project was completed in just 10 working days of conversion time. The result is a more efficient, reliable and user-friendly system that meets market requirements.

Why with KRIKO

The benefit for the customer

Many years of expertise in retrofitting

Efficient planning for short time frames and shutdowns

Additional safety through precise advance analysis

Individual and customized solutions that meet specific customer needs

Are you interested in a retrofit?

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