Eight Reasons for Adhesive Failure in Composite Films and Their Solutions:
Incorrect Adhesive Proportion: Issue: Errors in weighing adhesive components result in inadequate curing. Solution: Precisely weigh and record the proportions of all materials, and ensure thorough mixing to prevent uneven mixing.
Improper Adhesive Storage: Issue: Inadequately sealed curing agents react with moisture in the air, depleting their content and causing insufficient curing. Solution: Check the sealing condition of the adhesive before use.
Solvent Contamination: Issue: Solvents with high moisture content or impurities cause an imbalance in the adhesive mixture. Solution: Store solvents in a sealed manner and regularly check their moisture content.
Residual Alcohols: Issue: Un-dried alcohol components from alcohol-based inks or ink thinners remain and react with curing agents, causing adhesion failure. Solution: Use alcohol-based adhesives for alcohol-based inks and minimize alcohol usage in printing.
Solvent Residue: Issue: Excessive solvent residue in the composite hinders curing by encapsulating the adhesive. Solution: Regularly check the ventilation of the drying system and control the composite speed when applying a large amount of adhesive.
Excessive Adhesive Application: Issue: Applying an excessive amount of adhesive results in a large roll diameter and slow internal curing. Solution: Apply an appropriate amount of adhesive, and ensure thorough curing.
Inadequate Curing: Issue: Low curing temperatures lead to slow curing and inadequate cross-linking. Solution: Use the appropriate curing temperature and ensure sufficient curing time. Consider using a rapid curing adhesive if necessary.
Additives: Issue: Additives in the base material, such as those in PVDC and PVC, can delay or hinder adhesive cross-linking, react with curing agents, or penetrate the adhesive. Solution: Adjust the curing agent usage as needed to maintain bond strength and thermal stability.