Common Issues and Solutions in Carton Box Manufacturing
IV. Misaligned Folding
During the pre-folding process in the automatic box pasting machine, the cardboard fails to fold along the crease lines, resulting in misaligned folds. The causes of this issue are as follows:
The crease lines are too wide or unclear, leading to misaligned pre-folding.
Solution: Since it is impossible to change the crease lines, compensation can be made by adjusting the pre-folding guide rod.
Improper adjustment or inadequate fixation of the pre-folding guide rod causes misalignment.
Solution: Adjust the pre-folding guide rod through several trial adjustments, ensuring accurate folds before securely locking it in place.
Inconsistent tension in the transmission belts on both sides causes cardboard misalignment during folding.
Solution: Adjust the tension mechanisms of the belts to eliminate cardboard misalignment.
V. Glue Detachment from Carton
After gluing and forming, the bonded parts of the carton experience cracking. The reasons for this are:
Insufficient adhesive viscosity and inadequate glue application.
Solution: Commonly using white latex, dilute with water during application, simultaneously reducing viscosity. If viscosity is insufficient, remix a higher concentration adhesive. Increase the gap between the glue roller and the cardboard to enhance glue application.
Workshop temperature affecting adhesive viscosity, especially during summer and winter.
Solution: Control the workshop temperature around 20°C using temperature regulation devices like air conditioning to maintain proper adhesive viscosity.
Neglecting inspection before using white latex, resulting in expired or deteriorated adhesive.
Solution: Properly store and seal white latex; the shelf life is generally one year.
Mismatch between the selected white latex and the cardboard.
Solution: Due to the variety of white latex types in the market, choose based on specific product characteristics.
Glazed or film-coated sections hindering glue penetration.
Solution: Install a cardboard edge grinding device before gluing to eliminate the influence of glazing or coating. If possible, switch to hot-melt adhesive to melt the coating, facilitating glue bonding.
Insufficient pressure on the glued section during folding, excessive machine speed, and insufficient pressing time causing delayed glue penetration.
Solution: Increase folding roller pressure, appropriately reduce machine speed, and extend pressing time.
VI. Glue Overflow from Carton
After forming, excess glue leaks from the glued section, affecting the carton's normal use. The reasons for this are:
Excessive glue application.
Solution: Reduce the gap between the glue roller and the cardboard and appropriately lower the glue application.
Asymmetrical bonding between the glued section and the carton causes glue overflow.
Solution: Before gluing the carton, adjust the crease lines properly.
VII. Indentations on Box Lid or Bottom
After forming, indentations appear on the box lid or bottom, affecting aesthetics. This occurs as the folding section, under the pressure of the folding roller, not only presses the glued part but also causes indentations on the box lid or bottom.
Solution: Do not solely increase the pressure on the folding section; appropriately reduce the pressure on the folding roller.
VIII. Chaotic Collection of Cartons
To ensure orderly collection of cartons, a collection device is typically installed at the end of the box pasting machine. If this part is improperly adjusted, carton collection may become chaotic, reducing production efficiency. The main cause is the different speeds of the two sets of transmission belts.
Solution: Adjust the speed of the belt transmission and continuously monitor the collection part to ensure smooth carton collection.
