Full English Translation (Professional & Standard for Machinery Manual)
A paper bag machine takes printed or laminated paper, and completes the whole bag-making process in one smooth operation: automatic paper feeding, gluing, forming, creasing, bottom sealing, and outputting bags in the required dimensions.
Problems may occur during bag making and require timely troubleshooting and solutions. Below are three common troubleshooting methods for fully automatic paper bag machines.
1. Misalignment of Top and Bottom Layers
Misalignment of top and bottom layers refers to uneven edges of front and rear bags.
Causes:
- Uneven thickness or wrinkled edges of the composite film.
- Insufficient tension of the dual floating rollers.
- Poor rotation of some rollers.
Solutions:
- Check and adjust related guide rollers (e.g. offset rollers, deflection rollers).
- Adjust the tension of the dual floating rollers.
2. Spots or Bubbles on the Seal
Spots or bubbles on the seal mean an uneven sealing surface.
Causes:
- Uneven heat-sealing knife or heat-sealing silicone pad.
- Moisture absorption of hygroscopic materials (such as nylon film) during heat sealing causes bubbles.
- Insufficient heat-sealing pressure.
- Using one-component adhesive (e.g. neoprene adhesive) for heat sealing, which easily causes uneven pits on the seal.
Solutions:
- Replace the adhesive.
- Check or adjust the heat-sealing knife and heat-sealing silicone pad.
- Store raw materials and semi-finished products properly to prevent moisture absorption.
3. Length Scale Error
Causes:
Improper tension control, insufficient pressure of the film-feeding roller cylinder, unstable electric eye tracking, which affect the processing speed of plastic composite film bags, and excessive system error of the fixed-length system.
Solutions:
Reduce the bag-making speed and adjust it gradually.
Set the pre-adjusted film length (when adjusting blank bags) as accurately as possible to the actual bag length.
Check film compression and friction coefficient with a pressure gauge.
Adjust roller pressure, cylinder pressure and film tension.
Check and adjust printing cursor quality or spacing issues.
Calibrate the length setting system.
