When selecting polyurethane adhesives for composite flexible packaging, the following factors should be considered:
1.Adhesion strength:
When selecting an adhesive, evaluate its adhesion to different materials (such as polyester, polypropylene, polyethylene). High adhesion strength ensures that the package is not easy to delaminate or detach during transportation and storage.
2.Barrier properties:
Different adhesives have different barrier properties. Choose the right adhesive to ensure that the package can effectively block air, moisture and light, extending the shelf life of the product.
3.Chemical resistance:
If the package contents contain chemicals or solvents, choose adhesives with good chemical resistance and corrosion resistance to avoid chemicals from corroding the adhesive and affecting the integrity of the package.
4.Temperature resistance:
Ensure that the adhesive maintains good performance within the expected storage and use temperature range. Some adhesives may lose adhesion under high or low temperature conditions.
5.Processing technology:
Select the appropriate adhesive type based on the requirements of the production process (such as heat sealing, cold sealing or other coating methods). Different adhesives require different processing and curing conditions.
6.Food safety:
For food packaging, choose adhesives that meet food contact material safety standards, such as FDA or EU standards, to ensure that they are harmless to food and consumer health.
7.Environmental friendliness:
Choose adhesives with low VOC content or those that meet environmental certifications to reduce environmental impact and meet sustainable development requirements.
These details will help you make the best adhesive selection for a specific application.
