Common Flow Wrapper Problems and Solutions: Complete Troubleshooting Guide

Introduction

Even with regular maintenance, flow wrapper problems will occur. The key is knowing how to quickly diagnose and resolve these issues to minimize downtime.

Prevention is always better than repair — follow our daily maintenance checklist to minimize downtime.

This troubleshooting guide organizes the most common problems by category, with clear symptoms, causes, and solutions. We’ve organized the most common problems by category, with clear symptoms, causes, and solutions.

Key Takeaway: Most flow wrapper problems can be solved by checking seal temperature, film tracking, and component wear. Learn these basics and save hours of downtime.

How to Use This Guide

For each problem, you’ll find:
1. Symptoms – What you’ll observe
2. Likely Causes – Most common reasons
3. Quick Solutions – Step-by-step fixes
4. Prevention Tips – How to avoid recurrence

Part 1: Seal Quality Problems

Problem 1: Weak or Failed Seals

Symptoms:
– Seals separate easily when pulled
– Packages open during handling
– Product visible through seal area
– Inconsistent seal strength

Diagnostic Checklist:

Solutions:

1. Check and adjust seal temperature
2. Use calibrated thermometer to verify
3. Increase by 5°C increments

4. Re-test seal strength

5. Replace seal tape

6. Remove old tape with sealant remover
7. Clean surface completely
8. Apply new tape evenly

9. Press firmly

10. Check seal pressure

11. Inspect springs for fatigue
12. Replace if compressed

13. Adjust pressure settings

14. Verify film compatibility

15. Check film specifications
16. Confirm seal temperature range
17. Try known-good film sample

Problem 2: Seal Sticking or Burn Marks

Symptoms:
– Film sticks to seal bar
– Burn marks on film
– Film tears at seal
– Product damage from heat

Solutions:

1. Reduce seal temperature
2. Decrease by 5-10°C
3. Test with sample packages

4. Find minimum effective temperature

5. Clean seal bar

6. Use non-abrasive cleaner
7. Remove all residue
8. Apply anti-stick coating

9. Never use metal tools

10. Check seal timing

11. Verify dwell time is correct
12. Inspect cam wear if applicable
13. Check for timing drift

Problem 3: Uneven or Crooked Seals

Symptoms:
– Seal not centered on package
– One side stronger than other
– Wrinkled seal edges
– Asymmetric appearance

Solutions:

1. Realign seal bar
2. Check bar is parallel to anvil
3. Adjust using alignment tools

4. Verify with test packages

5. Replace worn anvil

6. Inspect wear pattern
7. Rotate or replace anvil

8. Ensure proper seating

9. Check film tracking

10. Film must be centered
11. Adjust tracking guides
12. Verify dancer tension

Part 2: Film Handling Problems

Problem 4: Film Wrinkling

Symptoms:
– Wrinkled film on finished package
– Wrinkles near seal areas
– Visual quality issues
– Product damage from wrinkles

Diagnostic Flowchart:

Film Wrinkling
    ↓
Is wrinkle in seal area?
    ↓ YES              ↓ NO
Check seal timing     Check film path
    ↓                     ↓
Check anvil condition  Check tension
    ↓                     ↓
Verify pressure        Verify forming collar

Solutions:

1. Adjust film tracking
2. Loosen film path
3. Manually center film
4. Retighten gradually

5. Run and observe

6. Check forming collar

7. Verify size matches product
8. Check for wear or damage

9. Adjust collar position

10. Reduce film tension

11. Check dancer operation
12. Adjust brake tension
13. Verify film properties

Problem 5: Film Tears or Breaks

Symptoms:
– Film breaks during operation
– Torn edges on package
– Frequent line stops
– Product exposed

Solutions:

1. Identify tear location
2. Near unwind: check edge quality
3. Near former: check collar

4. Near seal: check seal timing

5. Check for sharp edges

6. Inspect all rollers
7. Check forming collar edges

8. Look for nicks or burrs

9. Adjust film tension

10. Reduce brake tension
11. Check dancer operation

12. Verify film properties

13. Use edge guide

14. Install edge sensor
15. Enable auto-tracking
16. Check guide rollers

Problem 6: Film Tracking Problems

Symptoms:
– Film drifts to one side
– Film overlaps incorrectly
– Seal position varies
– Edge variations

Solutions:

1. Manual tracking adjustment
2. Loosen tracking roller
3. Move roller in small increments
4. Observe film behavior

5. Repeat until centered

6. Install edge guide

7. Add edge sensor
8. Connect to tracking adjustment

9. Enable auto-correction

10. Check dancer/square system

11. Verify smooth movement
12. Lubricate if needed
13. Replace worn components

Part 3: Package Quality Problems

Problem 7: Incorrect Package Length

Symptoms:
– Packages too long or short
– Variable package lengths
– Seal positions inconsistent
– Product count per box varies

Solutions:

1. Check encoder function
2. Verify encoder clean
3. Check mounting security

4. Test encoder output

5. Calibrate length setting

6. Measure actual package
7. Compare to HMI setting
8. Adjust if needed

9. Retest

10. Check product spacing

11. Verify timing screw adjustment
12. Check product sensors
13. Ensure consistent infeed

Problem 8: Product Misalignment

Symptoms:
– Product not centered in film
– Product contacts seal area
– Crooked packages
– Product damage

Solutions:

1. Adjust infeed guides
2. Center product on belt
3. Align with forming area

4. Check for wear

5. Verify timing

6. Check sensor position
7. Verify timing screw setting

8. Adjust product spacing

9. Inspect conveyor belt

10. Check belt condition
11. Verify tracking
12. Ensure proper tension

Problem 9: Wrapped Product Damage

Symptoms:
– Product crushed or deformed
– Product marks on film
– Leaking packages
– Customer complaints

Solutions:

1. Reduce film tension
2. Loosen gathering tension
3. Adjust roller pressure

4. Test with product samples

5. Adjust folding plates

6. Reduce pressure on product
7. Verify plate positioning

8. Check for wear

9. Modify speed settings

10. Reduce line speed
11. Check acceleration
12. Verify product handling

Part 4: Electrical and Control Problems

Problem 10: Machine Won’t Start

Safety First: Always check electrical issues with power OFF.

Diagnostic Sequence:

1. Check emergency stop
2. Verify E-stop not engaged
3. Reset if needed

4. Test restart

5. Check guards

6. All guards closed
7. Interlock switches functioning

8. Reset if needed

9. Check power supply

10. Main breaker on
11. Voltage correct

12. Phase sequence correct

13. Check PLC status

14. Power indicator lit
15. No fault codes
16. Restart controller if needed

Problem 11: HMI Touch Screen Unresponsive

Symptoms:
– Screen doesn’t respond to touch
– Commands not executing
– Frozen display
– Error messages

Solutions:

1. Restart HMI
2. Power cycle HMI
3. Wait 30 seconds

4. Restart machine

5. Clean screen

6. Use soft, damp cloth
7. Avoid harsh cleaners

8. Never use solvents

9. Check connections

10. Verify Ethernet cable
11. Check connector security

12. Replace cable if damaged

13. Update firmware

14. Download latest version
15. Follow update procedure
16. Back up current settings

Problem 12: Temperature Reading Errors

Symptoms:
– Temperature display shows “–”
– Wildly fluctuating temps
– Temperature won’t reach setpoint
– Over-temperature alarms

Solutions:

1. Check thermocouple
2. Verify connection
3. Clean contacts

4. Replace if damaged

5. Check heater element

6. Measure resistance
7. Verify continuity

8. Replace if open

9. Check SSR (Solid State Relay)

10. Check for output voltage
11. Replace if failed
12. Verify heat sink

Part 5: Mechanical Problems

Problem 13: Unusual Noise or Vibration

Symptoms:
– Grinding or squealing sounds
– Excessive vibration
– Rattling noises
– Impact sounds

Diagnostic Approach:

Solutions:

1. Identify noise source
2. Run without film
3. Run without product

4. Isolate which section

5. Check bearings

6. Listen for roughness
7. Check for play

8. Replace if needed

9. Check belts

10. Inspect for wear
11. Check tension
12. Replace if cracked

Problem 14: Speed Variation or Instability

Symptoms:
– Speed fluctuates
– Can’t reach target speed
– Stops at high speed only
– Speed different than display

Solutions:

1. Check drive system
2. Motor condition
3. Belt condition

4. Encoder feedback

5. Check PLC configuration

6. Verify speed settings
7. Check acceleration/deceleration

8. Reset to defaults if needed

9. Verify power supply

10. Check voltage stability
11. Measure current draw
12. Check for interference

Quick Reference Troubleshooting Matrix

When to Call Technical Support

Call immediately if:
– Electrical damage or burning smell
– Pneumatic system issues
– PLC or HMI replacement
– Safety system malfunctions
– Major component replacement

Information to have ready:
– Machine model and serial number
– PLC and HMI firmware versions
– Error codes displayed
– Problem description and when it started
– Steps already tried

Conclusion

Most flow wrapper problems have straightforward causes and solutions. By understanding these common issues and their fixes, you can reduce downtime and maintain production efficiency.

Key Takeaways:
1. Start with the simplest causes first
2. Document problems and solutions
3. Check seal components first for seal issues
4. Verify film handling for film problems
5. Contact support for complex issues

Need technical support?

Path Pack builds horizontal packaging machines in Hangzhou, China. Every machine is tested with the customer’s product and film before it ships. If you are evaluating a flow wrapper or troubleshooting a line already in production, contact our engineering team — we reply within one working day.

About Path Pack

For seal-related issues, refer to our cut-off knife adjustment guide.