Plastic Bottle Caps Polyethylene Terephthalate (PET)

Classification and Overview of Materials Used in Anti-Theft Plastic Bottle Caps

3. Polyethylene Terephthalate (PET)  

   - Characteristics:  

     - High clarity and good barrier properties against CO₂.  

     - Lightweight but less impact-resistant than PE or PP.  

   - Applications: Often used for carbonated beverage caps due to its gas barrier performance.  

4. Other Specialty Materials 

   - Polystyrene (PS): Occasionally used for rigid caps but less common due to brittleness.  

   - Biodegradable Plastics (PLA, PHA): Emerging in eco-friendly packaging but limited in anti-theft cap applications due to cost and performance constraints.  

Key Considerations for Material Selection:  

   - Barrier Properties (O₂/CO₂ resistance for beverages).  

   - Mechanical Strength (Impact resistance, torque resistance).  

   - Processing Compatibility (Injection molding efficiency).  

   - Sustainability (Recyclability or bio-based alternatives).  

Conclusion:  

HDPE and PP dominate the anti-theft cap market due to their balance of performance and cost, while PET is preferred for carbonated drinks. Emerging biodegradable materials face challenges but align with green packaging trends.