How to Ensure the Sealing Quality of Blister Packs?

In the packaging industry, the sealing quality of blister packs is crucial. It protects products from contaminants and extends their shelf - life. Here are the key ways to ensure good sealing.

1. Material Selection
Appropriate Packaging Materials
Choosing the right materials is fundamental. For blister cavities, PVC, PP, and PET are common. PVC seals well due to heat - softening, while PP resists chemicals. For lids or backing, aluminum foil or coated paperboard are often used. Aluminum foil, when laminated with heat - sealable plastic, forms a strong seal.
Compatibility of Materials
Materials must be compatible. Incompatible ones lead to poor adhesion and weak seals. Manufacturers should test material compatibility before mass production.

2. Sealing Process Optimization
Heat - Sealing Parameters
Heat - sealing is common, and optimizing temperature, time, and pressure is key. Temperatures that are too low prevent proper bonding, while high ones cause over - melting. Sealing time must be right for bonding, and correct pressure ensures contact between materials.
Sealing Equipment Maintenance
Sealing equipment needs regular cleaning to avoid debris build - up. Heating elements should be inspected and calibrated for accurate temperature control.

3. Quality Inspection
In - line Inspection
During production, visual inspection can spot obvious defects. Automated systems using cameras or infrared sensors can also detect irregularities and reject faulty packs.
Destructive and Non - destructive Testing
Peel - strength testing, a destructive method, measures seal strength. Non - destructive helium leak testing can find even tiny leaks.

In summary, ensuring blister pack sealing quality requires choosing the right materials, optimizing the sealing process, and strict quality inspection. This helps manufacturers produce reliable packs that protect products.