Fault phenomenon
Phenomenon
Solution
Bubbles appear on the composite membrane
The drying tunnel temperature is too low, leaving residual solvent
● Improve the drying tunnel, adjust air volume and wind speed
Solvent moisture content is too high
●Control solvent content is less than 0.2%
Environmental humidity is too high
● Keep the environment ventilated and dry
Composite film wrinkles
Uncoordinated winding or unwinding tension, too big or too small
● Adjust the closing and unwinding tension
Composite roll pressure imbalance or uneven pressure
● Adjust the composite roll to balance it
Composite roller filling or guide roller imbalance
● Adjust the compound roll or adjust the balance of seek roll
Composite film has white spots
Humidity in the environment or the solvent is too high
● Control environment humidity and solvent moisture content
Too much residual solvent
● Increase the temperature of the drying tunnel or slow down the speed
Stirring unevenly when using adhesive
● When mixing, stir well
Excessive amount of curing agent
● Reduce the amount of curing agent
There is still stickiness after the composite film matures
With wrong glue or uneven mixing with glue
● Correctly grasp the use conditions and process of adhesives
Humidity of the environment is too high, the solvent has too high water content
● Control environment humidity and solvent moisture content
Incomplete curing
● Increase the curing temperature or extend the curing time
The quality of the glue itself
● Replace glue
Composite film peel strength is low
Insufficient glue
● increase the concentration of work and replace the roller
Film is damp or corona treated
● Exchange film or corona treatment
Incomplete curing
● Prolong the curing time appropriately
Solvent water content is too high to misalign the base agent with the curing agent
● control solvent water content less than 0.2%
Bags produce odor
Drying temperature is too low, residual solvent is too much
● Improve drying tunnel temperature and increase air flow rate and wind speed
Dilution solvent contains aromatic impurities (toluene, xylene)
● Improve the purity of the solvent
Additive odor in the film
●Change film
The ink is not completely dry during printing.
Residual high-boiling solvents
● Rewind the printed film once through the tunnel
Adhesives contain aromatic solvents
● Replace glue
Low heat seal strength
The quality of the adhesive itself
●Change adhesive
Adhesive curing dose is too small
● increase the amount of curing agent
The humidity is too high or the solvent has too high water content
● Control environment humidity and solvent moisture content
Composite film is not matured
●Prolong the curing time
Source: Huashi Chemicals
