What causes poor vacuum performance? Is it a problem with the equipment or the packaging bags?

A systematic process must be followed when troubleshooting insufficient vacuum levels. The following methods can help pinpoint the root cause before requesting repairs or replacing equipment:

Diagnostic Procedure: Step 1—Run the machine empty (without a packaging bag, with the lid closed). If the vacuum gauge reads ≥ -90 kPa → The vacuum pump and chamber are functioning properly → Proceed to Step 2. If the vacuum gauge reads below -70 kPa → The equipment itself is malfunctioning → Proceed to Step 3.

Step 2—Conduct the test using brand-new, undamaged packaging bags that have passed batch inspection. If the vacuum is maintained → The original packaging bags are defective (minor punctures, incorrect material selection, poor barrier properties). If the vacuum is still ineffective → Check the positioning of the packaging bags and their alignment with the sealing strip.

Step 3—Equipment Troubleshooting:

The primary cause that is most often overlooked: vacuum pump oil. Rotary vane vacuum pumps require an oil change every 500–800 hours of operation (approximately once every 3 months under single-shift production conditions). Stale or contaminated oil can significantly reduce the ultimate vacuum and accelerate equipment wear. This is the most common cause of gradual performance decline, which operators often mistakenly attribute to “machine aging.”

YGPACK Service Advantages: All YGPACK equipment comes standard with an initial vacuum pump oil fill kit and a maintenance log card. Before submitting a formal repair work order, our technical support team can provide remote troubleshooting assistance, including guidance on vacuum gauge testing.