How does the piston sealing system of Desk Top Airless Bottle achieve zero leakage after 2,000 presses?

In the field of cosmetic packaging, "zero leakage" is not only a symbol of quality, but also a core guarantee of user experience. As a packaging solution provider trusted by global high-end brands, Yuyao Dietian Packaging Co., Ltd. has successfully overcome the leakage problem of desktop Airless Bottle in long-term use with its independently developed piston sealing system, and achieved the industry benchmark performance of zero leakage after 2,000 presses.
The core of the piston sealing system lies in the synergy of materials and structures. Through molecular dynamics simulation experiments, the R&D team of Yuyao Dietian Packaging selected two polymer materials - thermoplastic elastomer (TPE) and modified polypropylene (PP) as a combination of the piston body and the sealing layer.
TPE material: has high resilience and fatigue resistance, and can withstand repeated compression deformation;
Modified PP sealing layer: through nano-scale silicon coating treatment, the friction coefficient is reduced to below 0.02, ensuring smooth piston movement without wear and leakage. The composite structure of the two can still maintain stable sealing performance at extreme temperatures (-20℃ to 70℃), eliminating micro-leakage caused by material deformation from the source.
Dietian packaging's patented design "Dual-Lip Synchronized Sealing System" (DLSS) is the key to zero leakage.
Main sealing lip: adopts a progressive wedge structure to achieve dynamic fit with the inner wall of the bottle. The greater the pressure, the stronger the sealing effect;
Secondary sealing lip: built-in spiral guide groove, using the negative pressure adsorption effect generated by liquid reflux to compensate for the tiny gap of the main seal;
Vacuum compensation valve: a micro one-way valve is integrated at the bottom of the piston to automatically balance the air pressure in the bottle during the pressing process to avoid liquid back-sucking caused by negative pressure imbalance.
Through multi-stage sealing linkage, the system can maintain a sealing surface fit of ≥98% after 2,000 presses, and the leakage is less than 0.01 ml (the industry standard is ≤0.05 ml).
Yuyao Dietian packaging relies on a vertically integrated manufacturing system (mold development → injection molding → hot stamping → assembly), and integrates precision manufacturing capabilities throughout the entire chain:
Mold development: A five-axis linkage CNC machining center is used to ensure that the piston structure tolerance is controlled within ±30 microns;
Injection molding: Through the in-mold hot runner technology, the internal stress of the material is reduced and the shrinkage of the sealing surface is avoided;
Automated testing: Each batch of products undergoes air tightness testing (helium mass spectrometry leak detection method) and fatigue pressing testing, and the data is uploaded to the cloud in real time for traceability.
IV. Verification and market feedback
The piston sealing system of Yuyao Dietian packaging has passed international standards such as EU EN862 and US ASTM D4991, and has been tested in more than 30 high-end skin care brands around the world. Taking an international brand anti-aging essence product as an example, after it is equipped with a Dietian vacuum bottle, it has been used continuously for 6 months in a high temperature and high humidity environment, with a leakage rate of 0%, and a customer repurchase rate of 27%.
Since its establishment in 2011, Yuyao Dietian Packaging has always focused on the innovative research and development and manufacturing of cosmetic container packaging, with an annual production capacity of 30 million pieces, serving customers in Europe, America, Japan, South Korea and China. The success of its piston sealing system is not only due to the ultimate pursuit of materials, structure and technology, but also reflects the corporate philosophy of "defining the boundaries of technology based on user needs".