Get the latest updates on the Coronavirus impact on engineers.Click Here
CNC Motion Control

Machine module provides software-supported product changeovers

Koch Pac-Systeme designed a labeling and grouping unit in a toothbrush packaging line with a transport system at its core.

By Frank Würthner February 17, 2020
Courtesy: Beckhoff Automation

A machine builder embedded a high-speed linear motor transport system in a machine, adding speed and flexibility and saving space with the new design. Koch Pac-Systeme GmbH, headquartered in Pfalzgrafenweiler, Germany, specializes in building customer-specific blister packaging machines and systems. With extensive line design experience, the company’s engineers are able to stay flexible and implement each customer’s requirements. The packaging experts recently demonstrated their expertise with a complex new packaging line for toothbrushes.

The transport system from Beckhoff Automation is designed to replace mechanical systems with software functionalities that make the line more compact and more flexible for faster product changeovers.

Koch achieved a seamless, integrated and efficiently executed packaging process with customized equipment ranging from blister machines to product infeed and blister grouping modules to end-of-line packers. Customers received solutions that meet industry-specific requirements and are matched to the size and shape of the respective products. A line for packaging toothbrushes is controlled via automation software and processes up to 320 toothbrushes or 240 blisters per minute, showing off the packaging line’s flexibility.

Project manager Gert Müller explained the functional scope and complexity of the line with a total length of 28 m.

A total of 24 movers with light, 3D-printed blister grabbers travel along an 11-meter-long XTS circuit between one HSPP system, the laser labeling system and the second HSPP. Courtesy: Beckhoff Automation

A total of 24 movers with light, 3D-printed blister grabbers travel along an 11-meter-long XTS circuit between one HSPP system, the laser labeling system and the second HSPP. Courtesy: Beckhoff Automation

“At first, the line will be operated with two different formats for which the customer uses two different foil thicknesses,” he said. “What makes the line so attractive is its superior flexibility, because an automatic foil width adjustment feature allows the customer to use different foil sizes to produce additional blister sizes in the future. After the blisters have been formed, the toothbrushes are supplied via a high-speed pick-and-place (HSPP) system that uses a camera to control their position.

“Next, another HSPP places the cardboard backing and uses ultrasonic spot sealing to keep it in place for the actual sealing process. A laser system applies a code to the back of the card that is verified downstream via a camera system. After the blisters have been separated in a punch station, they are transferred via a two-axis portal to the central labeling and grouping unit before another HSPP system groups and transfers them to a cartoning machine. The packaged blister packs are then transferred to the customer’s downstream packaging steps.”

Transport system increases labeling and grouping unit efficiency

Müller explained how the labeling and grouping unit is an example of Koch’s expertise in developing innovative solutions.

“We installed a circuit that is 11-m long and equipped with 24 movers with special carriers for single and twin blisters. When the product changes, only the carriers have to be switched out,” he said.

Since this is a very quick and easy process, setup changeover times are reduced considerably, added global account manager Wolfgang Braun. “The end customer wants to produce different formats with our packaging line, and therefore very fast and flexible format changeovers are required.”

The two HSPP systems at the start and end of the labeling and grouping unit employ dynamic Beckhoff drive technology and are controlled together with the XTS via a single C6930 Control Cabinet PC Courtesy: Beckhoff Automation

The two HSPP systems at the start and end of the labeling and grouping unit employ dynamic Beckhoff drive technology and are controlled together with the XTS via a single C6930 Control Cabinet PC Courtesy: Beckhoff Automation

Jürgen Welker, director automation and technology at Koch, said there were two specific factors that convinced the company to use transport technology: The high throughput rate and the ability to adapt to various labeling speeds

Welker also noted machine design-related benefits from the transport system. “The labeling and grouping unit – and therefore the entire line – would have been 2 m longer and much more complex due to the additional mechanical components that would have been required. It also would have been much less accessible for the operators to execute format changes.”

Braun considered the flexibility and the ability to convert the line very quickly to be key benefits from the end customer’s perspective.

“The original plan called for a conventional solution based on a so-called bucket chain. While it was designed to be width-adjustable, it quickly encountered limitations because of the constantly expanding product spectrum. One – much more expensive – solution would have been to add a second bucket chain or even a split line with two separate packaging machines,” he said.

Transport system ensures high flexibility with advanced software functionality

The labeling and grouping unit integrates flexible motion sequences, according to Müller. “Depending on the format, the two-axis system transfers eight or 12 blister packs to four or six movers. These movers then travel to the labeling station. Another HSPP system places the blister packs in multiple layers into the cartoning machine’s product chain in accordance with the outer packaging type. The system stands still for loading and unloading while the labeling process runs continuously,” Müller said.

The software functionality also answers the requirement for rapid product changeovers, because each blister format has its own recipe, including the precise processing positions that can be selected with a mouse click. In addition, the machine module has two labeling devices. Depending on the format, the software tells the transport system which of these it needs to travel to.

The team responsible for the new Koch Packaging Line for toothbrushes (left to right): Wolfgang Braun, global account manager at Koch; Jürgen Welker, director automation and technology at Koch; Jonas Rauser, machine installer; Frank Würthner, industry manager, packaging technology at Beckhoff; Bernhard Michels, machine installer; Frank Helber, software programmer at Koch; Gert Müller, project manager at Koch. Courtesy: Beckhoff Automation

The team responsible for the new Koch Packaging Line for toothbrushes (left to right): Wolfgang Braun, global account manager at Koch; Jürgen Welker, director automation and technology at Koch; Jonas Rauser, machine installer; Frank Würthner, industry manager, packaging technology at Beckhoff; Bernhard Michels, machine installer; Frank Helber, software programmer at Koch; Gert Müller, project manager at Koch. Courtesy: Beckhoff Automation

PC- and EtherCAT-based control technology benefits

An industrial PC was able to control the 24 movers precisely. The control cabinet PC was able to control two HSPP systems by handling the systems as additional TwinCAT NC tasks. Both HSPP systems also were equipped with servo drive technology.

Jürgen Welker (right) of Koch Pac-Systeme shows Frank Würthner of Beckhoff how easy it is to switch out the blister carriers for rapid product changeovers. Courtesy: Beckhoff Automation

Jürgen Welker (right) of Koch Pac-Systeme shows Frank Würthner of Beckhoff how easy it is to switch out the blister carriers for rapid product changeovers. Courtesy: Beckhoff Automation

“TwinCAT software provides all necessary functionalities,” Welker said. “The fact that each mover is mapped as a separate servo axis in TwinCAT is hugely advantageous for us. That way, we can monitor and adjust each mover separately, which is convenient and safe due to integrated higher-level functions like collision avoidance. And to top it all off, there is the exceptional performance of EtherCAT. The controller makes full use of EtherCAT’s extreme speed, particularly where the communication with the many servo drives in the system is concerned.”

Frank Würthner, business management packaging, Beckhoff Automation. Edited by Chris Vavra, associate editor, Control Engineering, CFE Media and Technology, cvavra@cfemedia.com.

MORE ANSWERS

Keywords: mobile machinery, system integration

Koch Pac-Systeme designed a labeling and grouping unit in a toothbrush packaging line with a transport system.

PC and EtherCAT-based technology helped the machine could operate efficiently without any challenges.

The software functionality also answers the requirement for rapid product changeovers.

Consider this

What benefits could your plant derive from a transport system?

Links:

www.koch-pac-systeme.com

www.beckhoff.com/XTS


Frank Würthner
Author Bio: Frank Würthner, business management packaging, Beckhoff Automation