PP Straw functionality hinges on precise internal diameter calibration that balances flow rate against capillary action. Diameter specifications vary according to beverage viscosity categories - thicker shakes require wider bores than carbonated drinks. Wall thickness optimization achieves flexibility for comfortable mouthfeel while maintaining kink resistance under typical sucking pressure. Bendable variants incorporate corrugation zones with strategic thinning that permits angular adjustment without collapse. These sections undergo fatigue testing through repeated articulation cycles to validate durability.  

Surface characteristics directly influence user experience. Micro-polished interiors reduce liquid adhesion for efficient beverage extraction. External texturing enhances grip security, particularly important with chilled beverages causing condensation. For carbonated applications, PP Straw designs incorporate micro-perforations near the top section to manage froth dispersion. Specialized formats feature integrated filters that capture fruit pulp or ice fragments without impeding flow. All variants undergo real-world simulation testing with diverse beverages to measure functional consistency.