Zhejiang Mingli Machine Technology Co., Ltd.
Labor problems in bag production are rarely just about wages. Skilled operators are hard to hire and harder to keep, new staff take time to train, and quality can shift from one shift to the next. Before deciding whether bag production line automation is worth it, it helps to know where labor actually goes on your line. This guide shows where manual work concentrates, what it really costs, and how to think about the return on automating it.
The bag making machine itself usually needs fewer people than you would expect. The heavy labor tends to sit around it, in the steps that happen before and after bag forming:
Loading and changing film rolls
Attaching valves to liquid, bag-in-box (BIB), or valve bags
Folding finished bags into a consistent shape
Sealing, especially on large-format bags
Inspection and handling between stations
On liquid bag and BIB lines in particular, valve adding and folding are fiddly, repetitive, and highly dependent on operator skill. That is where a well-run line and a struggling one tend to diverge.
Payroll is the visible number. The costs that are harder to see often matter more:
| 1 |
Rework and RejectsA valve placed slightly off position or a fold that varies from bag to bag becomes a leak risk or a rejected unit. The cost shows up in scrap and rework, not in the labor budget. |
| 2 |
Dependence on Experienced OperatorsWhen output and seal quality rely on a few skilled people, one resignation can shift your whole line's performance. |
| 3 |
Training TimeNew hires need time before they match an experienced operator, and during that time output and consistency suffer. |
| 4 |
Shift-to-Shift InconsistencyThe same line can produce noticeably different results on different shifts, which makes quality problems hard to trace and fix. |
Mingli's intelligent robot accessories address three of these steps, all aimed at liquid bag, BIB, and valve bag production:
| Manual Step | Automated Option | What It Addresses |
| Valve adding | CCD Visual Valve Adding Robot (ML-911) | Positioning deviation and leak risk |
| Folding | Liquid Bag Folding Robot (ML-2150) | Slow folding and uneven bag shape |
| Sealing | Intelligent Bag Sealing Machine (ML-4500) | Seal quality that depends on operator experience |
For a full breakdown of what each one does, see our guide to intelligent robot accessories in bag making.
There is no universal payback figure, because every line is different. A more reliable approach is to work through your own numbers:
How many people, across how many shifts, does each manual step currently take?
How much scrap or rework comes from valve, folding, or sealing errors?
What would equipment, installation, and upkeep cost over the machine's working life?
If output grows, will manual steps become the next bottleneck?
Judge the answer on total cost of ownership rather than the equipment quote alone, as covered in our bag making machine cost guide.
If you mainly run simple flat bags with no valve or folding step, if volumes are low, or if labor is not actually your constraint, extra automation may not pay off yet. The right time is when manual steps start limiting output or quality.
Mingli's robot accessories are built for the same applications as its liquid bag and BIB bag making machines, and draw on the company's experience with CCD vision positioning. If you are weighing automation for a liquid bag, BIB, or valve bag line, our team can help you identify which step is worth tackling first.
Want a second opinion on where your line loses the most labor? Send us your bag type, output volume, and which steps are still manual, and we'll help you work out where automation fits.
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