Common Problems & Solutions in Paper Cup Production

Here are the common problems happens in paper cup production. It is easier to find the solutions here. If any problem you could not sovle, contact SHUNDA paper cup machine after-service department, we could serve you 7*24.

1. Leakage at the cup bottom Cause: Insufficient bottom heating temperature, insufficient seaming pressure, uneven bottom glue application Solution: Increase bottom heating temperature; raise seaming cylinder pressure; adjust bottom glue wheel gap and speed 2. Cup body seam cracking / debonding Cause: Improper hot air temperature, insufficient air pressure, paper deviation, uneven PE film heating Solution: Adjust hot air temperature and air volume; calibrate forming guide; clean heating nozzles 3. Deformed / loose cup rim Cause: Worn curling wheels, insufficient curling pressure, insufficient rim heating, unsuitable paper stiffness Solution: Replace curling wheels; adjust curling mechanism pressure; properly increase rim heating temperature 4. Inconsistent cup height Cause: Inaccurate paper feeding, worn cutting blades, servo positioning error, unstable paper tension Solution: Calibrate paper feeding encoder; grind or replace cutting blades; recalibrate servo parameters 5. Wrinkles and creases on cup body Cause: Poor paper feeding, mismatched molds, uneven guide wheel pressure, damp paper Solution: Clean paper path; inspect and replace molds; balance left-right guide wheel pressure 6. Uneven gluing, glue overflow or debonding Cause: Improper glue wheel gap, abnormal glue concentration/temperature, worn glue scraper Solution: Fine-tune glue wheel gap; adjust glue concentration and temperature; replace glue scraper 7. Jamming & shutdown during forming Cause: Glue buildup on molds, paper path blockage, sensor failure, excessive chain/cam clearance Solution: Clean molds and paper path; check and reset photoelectric sensors; adjust transmission clearance 8. Out-of-round or eccentric bottom Cause: Eccentric bottom mold, worn bottom seaming wheels, deviation of bottom paper feeding, inaccurate bottom cutting Solution: Calibrate concentricity of the bottom mold; replace bottom seaming wheels; adjust bottom paper positioning baffles 9. Scorching marks on outer cup wall Cause: Excessively high heating temperature, overlong heating time, misaligned hot air nozzles Solution: Lower heating temperature; shorten heating delay; calibrate nozzle angle and position 10. Unstable speed & low output Cause: Insufficient air pressure, servo parameter drift, belt slipping, unstable temperature control Solution: Check air compressor pressure; optimize servo operation curve; tension transmission belts