Americans consumed almost 450 million lbs. of breakfast sausage and ham in 2012, equating to nearly $1.5 billion in sales for sausage producers. While it might be true that most people don't want to see the production process behind this hearty centerpiece of breakfast, this growing consumer base certainly wants to know there are keen-eyed, well-informed operators on the plant floor ensuring the integrity and quality of the product.
The Jimmy Dean brand, part of the Tyson Foods portfolio, sells more refrigerated breakfast sausage than the next top four producers combined. To maintain such a leading position, the company must not only offer a consistently high-quality and uniform product, but must do everything possible to keep costs low and throughput high, maintaining a competitive price point among competition eager to cut into its market share.
Weight Variance Problems
The Tyson Foods - Hillshire Brands facility in Newbern, Tennessee, produces more than 150 million lbs. of sausage annually. The Jimmy Dean 1-lb., fresh sausage rolls, affectionately called “chubs,” account for more than two-thirds of this production total. The facility dedicates 11 machines to grinding, seasoning, filling and packing chubs of more than 300 different SKUs.
Plastic-wrapped sausage chubs are sold by the pound, so getting just the right amount of sausage in each roll is crucial. At the end of each line, a check weigher assesses and removes chubs outside the acceptable weight variance. Off-weight chubs are sliced open manually and checked for any contaminates. The sausage is either put back into the system or trashed — both costly options.
Because its product is priced per package, any amount of meat included beyond the required weight results in lost revenue. At the same time, if a chub is underweight, customer satisfaction is at risk, because customers aren't getting what they pay for.
Additionally, the Federal Meat Inspection Act requires that packages of meat products bear an accurate statement of the quantity of their contents in terms of weight, measure or numerical count. Every state in the country has similar or additional regulations. If a weights-and-measures inspection finds packages mislabeled, the food can't be sold and fines can be incurred, all of which is damaging both to a company's reputation and the bottom line.
Operators at the Newbern plant were experiencing unacceptable variances in chub weight, giving away and throwing out too much product. Unfortunately, at the time, operators didn't have access to enough control-system data to understand the actual amount or cause of giveaway.
Manufacturing Intelligence Strategy
Plant engineers saw an opportunity to reduce weight variance if they could better understand the cause of the problem, so they brought their problem to corporate engineering for help. Jon Riechert, a senior project engineer for Tyson Foods at the corporate level, already had led the implementation of a manufacturing intelligence strategy and information system at plants in Florence, Alabama and Kansas City, Kansas. After listening to concerns from his engineers in Tennessee, Riechert brought in a team from Rockwell Automation Solution Partner Grantek Systems Integration to implement a manufacturing intelligence strategy in Newbern.
Grantek worked with the Tyson Foods control, quality and maintenance engineers to understand the behavior the team wanted to drive with a manufacturing intelligence strategy. For the plant team, a better understanding of finished product weight was the top priority. However, additional data points throughout the process line also were necessary to understand how weight fluctuations were occurring.
Grantek worked with Riechert and his team to implement a manufacturing intelligence solution based on the FactoryTalk® software suite. The software integrates directly with the Logix control platform from Rockwell Automation to access real-time production data. Tyson Foods had previously standardized on the Logix control platform across all of its facilities, which simplified integration of the information software to the plant-floor control system.
In addition, the Newbern plant already was running on a single industrial network, EtherNet/IP™, which greatly simplified data collection. The team connected the 11 chub-line machines to two new on-site servers running FactoryTalk Historian software via EtherNet/IP. This allowed the team to collect data over longer-term periods for trend viewing and compare performance across machines. During a shift, if one machine is producing chubs of greater variance, the operators can look at past data and see just when the issue began. If all other machines are functioning properly and under capacity, perhaps production will move until the issue is resolved.
Grantek then installed FactoryTalk VantagePoint EMI software to aggregate information from multiple data sources — the controller, historian and SQL server. Gathering data into one centralized dashboard provides easy access to real-time data and key performance indicators (KPIs) via any Internet browser. The FactoryTalk VantagePoint server is located in the Newbern plant. However, as a web-based reporting platform, it's accessible to both corporate and Newbern personnel.
The Newbern plant engineers, those interacting with the data on a daily basis, worked with Grantek to design the system dashboards. “The Newbern team had full control over what they wanted to see on the FactoryTalk VantagePoint dashboards,” Riechert says. “I've worked with this software enough to understand that there are almost infinite possibilities of what it can show visually. It's very flexible, but the local team has to like it or they won't use it.”
“Before we implemented this system, operators could only see how many bad apples were produced,” Riechert explains. “Now operators can see weight fluctuations along the line, the exact giveaways on finished chubs, machine downtime, OEE and even meat temperature.”
Armed with this information, Newbern engineers are close to a yield improvement of 0.10% within six weeks of rolling out the new system. This translates into savings of 105,000 chubs per year and hundreds of thousands of dollars in cost of goods sold.
“The control engineering team is certainly much happier,” adds Riechert. “Now that they can see the weight of each chub as it goes through the line, they were able to track some variance to a specific filler and make a fix to reduce some of our giveaway right off the bat. But our quality assurance folks might be even happier. They were the ones that were doing all the weight checks. Instead of extrapolating giveaways based on hand samples taken several times a day, they now have constant, real-time insight into the weight of each chub, each batch and each shipment.”
Though the yield improvement of 0.10% was all the company needed to justify return on investment (ROI) on the project, Tyson Foods expects their new information solution to reduce giveaway another several tenths of a percent, increasing yield by up to 0.50%, or more than half a million lbs. of sausage.
“Beyond meeting, and potentially exceeding our project goals, it's important to our company that this solution is flexible enough to grow not only with production changes, but with our engineer's changing perspective,” Riechert says.
“The FactoryTalk system provides the data our operators need to understand what to pay attention to, and where problems are occurring,” he adds. “Once they start to see the high-level patterns that were previously impossible to collect or see manually, they can determine exact causality and what changes we can make to improve the system. After a few months, they start to ask for more tags, dashboards and reports. We are currently considering adding energy-use metrics to the system at several plants. The information is empowering, and they want more.”
Grantek Control Systems Inc., based in Burlington, Ontario, Canada, is a designated Rockwell Automation Solution Partner. The company provides integrated manufacturing automation services. Its solutions are designed to help improve manufacturing productivity, product quality, asset utilization and integrated technology.