These new beams can be produced at up to 600 ft/min, so it's an interesting area for automation. Mills have typically had five to six people climbing over the loads to staple them, which caused accidents and worker compensation issues. Automation gave them an opportunity to use these workers in different roles, away from non-value added functions. Now they are part of running the monitors, controls, and systems required to keep production running at that fast rate.
With increased communication and coordination between the robots, the product is coming off the line and final layup is approximately 80 ft lengths. Then it moves into an in-process area where, according to the load request for beams, they are cut into 12 ft to 60 ft beams.
The system doesn't know until it goes through the final saw operation and is fed out, whether it will be wrapping a 12 ft, 30 ft, 40 ft, or 60 ft length. But by calculating in real-time the length of the film required to wrap that specific load, the system is able to receive the information on whether it will be converted into a bundle of 40 ft or 60 ft beams.
Concern for worker safety when climbing on the wood to stretch the wrapping led to development of the new robotic system. Robots now bring in each piece, accurately measure and stretch the wrapping to match the piece size, apply the sealant, and stack the wood for distribution.
The system uses one FANUC Robotics M–710iC/70 robot, two M–16iB/10L robots, and one M–20iA/10L robot to complete the process. Previously, four or five people worked on the manual system. While one worker remains in place providing system maintenance, the remaining workers have been moved to more value-added, non-hazardous maintenance positions.
A unique feature that the system offers is its carousel arrangement with four different rolls for different-sized beams. This simplifies the load changeover significantly from manual operation and workers directly involved with the process. It makes it much faster and safer to keep up with products coming in from the layup line. The higher level of automation also helps to reduce scrap and maximize yields, along with loads that were scrapped because they didn't get wrapped properly.
In the past, lines could be delayed in the process because they weren't wrapped right by the individuals, or workers were not available and ready for the next wrapping operation. An indirect impact of the automation is the consistency it brought to the operations by increasing throughput and quality. We typically find customers looking for a system payback that is two years or under, but the majority of projects are at least half of that time.