What Should You Check When a Pouch Is Not Picked Up Correctly?

On a premade pouch packaging machine, pickup is the first mechanical handover in the cycle: a single pouch must be separated from the stack and transferred to the gripper station. When a pouch is not picked up correctly, the fault is usually visible as missed cycles, doubles, or skewed pouches. This guide covers the pickup stage only, and follows one logic throughout: what it looks like, why it happens, what to check, and how to fix it.

What incorrect pouch pickup looks like

Typical symptoms reported by operators include:

• No pouch taken at all, leaving an empty gripper cycle.
• Two or more pouches taken together (doubles).
• A pouch lifted at an angle, or held by one corner only.
• A pouch released or dropped between the magazine and the grippers.
• A pouch handed over off-centre, so gripper position is inconsistent.
• Intermittent faults that appear only near the end of a stack.

Recording which symptom occurs, and how often, narrows the possible cause faster than adjusting several settings at once.

Five possible causes

1. Pouch position and stacking

What it looks like: skewed or off-centre pickup, worse as the stack runs down. Why it happens: the stack may be loaded unevenly, reversed, or not squared to the pickup point, so the suction position no longer matches the pouch face. What to check: stack orientation, alignment against the guides, stack height, and whether pouches sit flat rather than fanned. How to fix: restack in smaller, squared batches, confirm the loading direction, and keep stack height within the working range used on your machine.

2. Pouch condition

What it looks like: doubles, or suction that grips then loses the pouch. Why it happens: static, curled edges, dust, moisture, film variation between batches, or pouches that stick together after storage can all prevent clean separation. What to check: flex a handful of pouches by hand and see whether they separate freely; compare a new carton with the one in use; look for curl, embossing, or surface powder in the suction area. How to fix: fan the stack before loading, store pouches in stable conditions, keep one batch in use at a time, and raise a supplier query if a batch behaves differently from previous deliveries.

3. Suction or gripping

What it looks like: weak or missed pickup, or a pouch dropped in transfer. Why it happens: worn, hardened, or contaminated suction cups, a partly blocked vacuum line, a leaking fitting, a sluggish vacuum valve, or gripper jaws that no longer close evenly. What to check: cup sealing faces for wear and residue, hose routing for kinks, filters and silencers for blockage, valve response during a slow manual cycle, and gripper jaw contact across the pouch edge. How to fix: clean or replace cups as a set, clear or replace filters, repair leaks, and service the valve or grippers according to your maintenance schedule.

4. Bag magazine condition

What it looks like: inconsistent pickup even though pouches and suction appear sound. Why it happens: magazine guides may be set too tight or too loose, separator fingers or hold-down devices may be misadjusted or worn, or the magazine feed may not advance smoothly. What to check: guide spacing against the pouch format in use, separator and hold-down settings, wear on contact surfaces, and free movement of the magazine mechanism. How to fix: reset the guides for the current format, adjust separators so only the top pouch is released, and replace worn contact parts.

5. Mechanical movement and alignment

What it looks like: pickup that fails at speed but works in manual or slow cycle. Why it happens: the pickup arm may be out of alignment, timing between pickup and gripper closing may have drifted, cams or linkages may be worn, or fasteners may have loosened through vibration. What to check: arm travel and end position, timing in slow manual cycle, play in linkages and bearings, and the tightness of mounting hardware. How to fix: realign the arm, restore timing to the machine documentation, eliminate play, and retighten hardware. Where sensors monitor pickup, confirm they are clean and correctly positioned.

Step-by-step troubleshooting

1. Stop the machine and apply your plant's safety and lockout procedure.
2. Record the exact symptom, the pouch format, and the frequency of the fault.
3. Inspect the loaded stack: orientation, squareness, height, and whether pouches separate by hand.
4. Check the suction cups and grippers visually, then run a slow manual cycle and observe contact and release.
5. Check the vacuum path for leaks, blockage, and valve response.
6. Verify magazine guides and separators against the format in use.
7. Check pickup arm alignment, timing, and mechanical play.
8. Change one variable at a time, then run a short trial before returning to full speed.
9. Log the cause and correction so the next shift can see the history.

Troubleshooting table

Practical prevention tips

Most repeat pickup faults can be reduced by routine discipline rather than new settings. Fan and square each stack when loading, keep one pouch batch in use at a time, and store pouches in dry, stable conditions. Include suction cups, filters, and gripper faces in scheduled inspection, and replace cups as a set instead of individually. Keep a written format record of magazine and separator settings for each pouch size so changeovers are repeatable. Train operators to report the symptom rather than the assumed cause, and keep a short fault log at the machine.

FAQs

Why does pickup fail only with one pouch batch? Film characteristics, curl, surface finish, and storage conditions can vary between batches, which may change how easily pouches separate. Compare the batch in use with a previous one before adjusting the machine.

Should suction cups be replaced individually or as a set? Replacing as a set is generally preferable, because mixed wear can cause uneven contact and skewed pickup.

Why does pickup work in manual mode but fail in production? Faults that appear only at production speed often point to timing drift, mechanical play, or a slow vacuum response rather than the pouch itself.

Conclusion

When a pouch is not picked up correctly, work through the pickup stage in order: pouch position and stacking, pouch condition, suction and gripping, magazine condition, and mechanical movement and alignment. Changing one variable at a time and logging the result keeps diagnosis repeatable across shifts. If pickup problems persist on your line, our engineering team can review your pouch format and premade pouch packaging machine configuration and advise on line layout and setup.