OEE of Packaging Lines: The Three Types of Losses and Six Leverage Points

OEE: The True Figure Behind the Cycle Count

The cycle rate listed in the datasheet indicates how fast the machine can operate. The OEE (Overall Equipment Effectiveness) indicates how much is actually produced. Packaging lines typically achieve 45 to 65 %—the difference from the rated capacity consists of losses that can be broken down into three categories. By measuring them separately, you’ll know which lever to pull first.

The Formula and Its Three Factors

OEE = Availability × Performance Rate × Quality Rate

An example using typical values: A line with 90 % availability, a 95 % performance rate, and a 99.5 % quality rate achieves 0.90 × 0.95 × 0.995 = 85 % OEE—which is world-class. In reality, many lines tend to be closer to 0.80 × 0.90 × 0.98 = 71 %, and in practice, factoring in setup times, the result is between 45 and 65 %. The multiplication illustrates the scaling effect: losing 10 % on each of three factors results in a loss of 27 % output, not 10 %.

Loss Type 1: Availability – The Line Is Down

Downtime is any minute during which the line is not running as scheduled:

• Format change: 20 to 45 minutes on the VFFS, 10 to 30 on the bagging line—with two changeovers per shift, that adds up to over an hour of setup time. The System for Changing Formats shows where time goes.
• Malfunctions: Film tears, product jams, sealing defects—minor individually, but collectively they account for the largest cost item on many production lines.
• Cleaning and Product Changes: Scheduled breaks that still reduce availability; CIP-compatible designs shorten them.
• Waiting time: Line ready, front machine not delivering—a line synchronization problem, not a machine issue.

Loss Type 2: Performance—the line is running below target speed

The performance rate compares the actual cycle time with the rated cycle time. The typical brakes:

• Minor disruptions without downtime: Automatically corrected film web errors and re-tensioning cycles add to cycle time but do not appear as downtime.
• Recipe Tips: Sealing times set too conservatively “for safety”—every tenth of a second per bag adds up over the course of a shift.
• Product Supply: A starvation feeder (hopper, conveyor) cycles the line.
• Start-up after each shutdown: Every new launch needs its initial funding until it is approved.

Loss Type 3: Quality—Scrap and Rework

The quality rate is calculated by comparing the number of saleable bags to the number of bags produced:

• Start-up Committee: First bags produced after the format change and formula change, until approval.
• Seal seam defects: Open seams caused by incorrect temperature, product residue in the seam, worn-out jaws.
• Weight error: Bags outside the fill tolerance range are removed from the dosing process—rejected or reweighed.
• Manual intervention: Visual defects (creases, print defects) that are manually sorted out.

Six Ways to Improve OEE

1. Systematically reduce the time required for format changes: Tool-free quick-change format parts cut changeover time in half; schedule changeovers during shift breaks; a pre-set changeover protocol ensures the process is independent of individual operators. Reducing the time for two changeovers per day from 40 to 20 minutes results in a gain of approximately 14,400 bags per week at 60 cycles per minute.
2. Make Full Use of Recipe Management: The HMI stores 50 to 100 recipes as a block—sealing temperature, film length, and target weight—with the push of a button. Manually entered values are the most common cause of start-up scrap.
3. Replace wear parts according to schedule: Replace sealing bands, blades, and gaskets at scheduled intervals, not after a failure. Scheduled maintenance during shift breaks only affects availability as planned—unplanned breakdowns result in uncontrolled costs. A proactive approach: Predictive Maintenance for Packaging Machines.
4. Ensuring Film Quality: Accept every batch of film that has undergone a seal window inspection. Film is the most cost-effective way to prevent seam defects—and the most commonly overlooked cause.
5. Measure instead of estimate: Track downtime by cause (including brief outages), record cycle counts, and tally scrap by cause. Only by separating these three types of loss can you determine whether availability, throughput, or quality is the key factor—without measurement, you’ll be optimizing in the wrong area.
6. Train staff and assign responsibilities: The operator determines the start-up scrap rate and response time in the event of malfunctions. Training on the specific production line, combined with assigning a designated person in charge for each shift, demonstrably reduces start-up and malfunction-related losses—the same effect as with the Multi-head scale, the accuracy of which depends on zeroing and cleaning.

Where to Start: Pre-Project Measurements

Improving OEE starts with a week of honest measurement: runtime, actual cycle time, and scrap per shift, broken down by basic code. The results almost always reveal the first area for improvement on their own—on most lines, it’s format changes or minor disruptions, rarely the machine speed itself. A new, faster machine with unchanged losses does not improve OEE: it makes downtime more expensive.

Frequently Asked Questions

What is a good OEE for a packaging line?

Industry standard: 45 to 65 %; a value above 75 % is very good, and 85 % is world-class. What matters is the purpose of the comparison: your own performance over time, not external benchmark figures.

How do I calculate OEE with a reasonable amount of effort?

Three figures per shift: planned runtime vs. actual runtime (availability), actual cycle time vs. nominal cycle time (throughput), good bags vs. total bags (quality). The product of these three rates is the OEE—going into more detail requires additional effort, but it doesn’t change the basic message.

Is OEE monitoring worth it even for a single machine?

Yes, that’s exactly the point: Without measurement technology, format changeover and startup losses go unnoticed in day-to-day operations. The simple shift log method costs nothing but discipline.

Does a faster machine automatically result in higher OEE?

No. OEE is relative to rated capacity—if you increase the rated cycle rate without reducing losses, you’ll maintain the OEE but only increase the cost per minute of downtime. First reduce losses; then think about speed.

Related pages: Format Change on Packaging Machines | Predictive Maintenance for Packaging Machines | VFFS Guide | Vertical Filling and Sealing Machine

Request technical specifications and a quote for your production line. Please specify the product, bag size, and target output (bags/min.) – Request Technical Specifications and a Quote.