1. Material Compatibility:
All components in contact with the perfume (pump chamber, piston, ball valve, valve seat, dip tube, gasket) must withstand long-term exposure to high concentrations of alcohol, fragrance compounds (which may contain esters, aldehydes, etc.), and solvents without swelling, dissolving, cracking, leaching, or undergoing chemical reactions.
2. Sealing Performance:
Static sealing: The bottle neck gasket must effectively seal the bottle opening.
Dynamic sealing: The seal between the piston and the inner wall of the pump chamber is critical; it must maintain integrity during prolonged reciprocating motion to prevent alcohol evaporation and fragrance loss.
Valve sealing: Inlet and outlet valves (if applicable) must close tightly when not in use to block air ingress and liquid evaporation. Fluorination treatment is often employed to enhance the surface inertness of sealing components and improve sealing effectiveness.
3. Atomization Performance:
The nozzle orifice diameter, internal swirl chamber design, and liquid pressure collectively determine the spray's fineness, uniformity, cone angle, and pattern (e.g., fan-shaped or conical). The performance must achieve the "mist-like lightness" expected by consumers.
4. Dosage Accuracy and Consistency:
The volume of liquid dispensed per actuation (typically 0.05 ml – 0.2 ml) must be precise and stable, with minimal variation between batches.
5. Actuation Feel:
The design must balance spring force and friction to provide a smooth, effortless, and responsive actuation experience that conveys a sense of premium quality. Stroke length and initial actuation force are key parameters.
6. Resistance to Evaporation / Fragrance Preservation:
This is the defining feature that distinguishes perfume pumps from standard pumps. Strategies include multi-layer sealing designs, high-quality sealing materials (especially fluororubber), and valve sealing. Additionally, techniques such as filling the pump with inert gas or utilizing special vacuum designs to minimize headspace air help delay perfume oxidation and evaporation.
7. Compatibility and Fit:
Pump dimensions (particularly bottle neck thread specifications) and dip tube length must perfectly match the bottle design. The pump's output volume must be compatible with the perfume's viscosity and surface tension.
8. Physicochemical stability:
After long-term storage, the components do not deform or age, the springs do not fail, and the liquid remains uncontaminated.