Automated laser marking of injection molded parts under clean room conditions

We automated the laser marking of new injection-molded parts in a clean room for a medtech parts producer. Thanks to the fast cycle time and simple, safe operation via HMI, the robot system is a double win: in terms of efficiency and user-friendliness.    

The challenge 

Our customer in the medtech sector specializes in the production of complex injection molded parts. For one of its injection molding machines, the task was to automate the laser marking of the parts - within a specified very short cycle time. Another challenge was to design the laser process in such a way that the laser image applied met the customer's high requirements. The system also had to fit according to the given clean room specifications.  

The solution 

We developed an automation solution with a FANUC industrial robot for handling the injection molded parts. The robot takes two injection molded parts at a time from the injection molding machine and places them next to each other in the laser station for marking. The already labeled pair of parts was previously removed and turned with the help of a flip station. 

At the end of each cycle, the finished laser-cut parts are transferred from the flip station to the discharge conveyor belt, where they are stacked for cooling. Rejects and start-up parts from the injection molding machine are discharged via a chute. Q-parts can be requested via a button and discharged on a separate chute. 

An important step on the way to the solution was a number of laser tests carried out in advance. In close cooperation between engineering, laser manufacturer and customer, we were able to develop an optimally functioning laser station that is easy and safe to operate via HMI. The system meets the clean room requirements and was documented and certified in accordance with GMP.  

“The system concept impresses with its high functionality and efficiency in a small space. Operation is also intuitive and safe.”  

The project 

Precise preliminary work with all clarifications guarantees an optimal start for such a project. We also successfully passed the FAT (Factory Acceptance Test) and SAT (Site Acceptance Test) on time, thanks to our internal, recorded inspection and test phases and were able to hand over a perfectly functioning complete system to the customer on time.  

The Robotec team included Rolf Kalt (project management, design & construction) and Timon Fink (software programming & commissioning).