The key to achieving this seemingly contradictory function of perfume breathable film lies in its precise microstructure design and application of material science, which are mainly achieved through the following four core technologies:

Micro porous engineering design

The membrane surface is covered with regular micropores with a diameter of 0.01-0.1 μ m (equivalent to one thousandth of a human hair), which:

20 times smaller than water molecule clusters (about 100 μ m), effectively blocking the passage of liquids

100 times larger than aroma molecules (0.3-0.6nm), allowing for free diffusion

Adopting an asymmetric pore structure and a funnel-shaped design with small inside and large outside to further prevent liquid infiltration

Material surface modification technology

By plasma treatment or chemical grafting, the membrane surface is formed with:

Superhydrophobic layer (contact angle>150 °), with alcohol solution rolling in a spherical shape on the surface

Negative charge modification layer, using electrostatic repulsion to prevent negatively charged liquid molecules

Chemical inert treatment, resistant to ethanol (concentration up to 95%) and ester solvents in perfume

Multi layer composite structure

A typical sandwich structure includes:

Outer layer: PTFE microporous membrane (thickness 50 μ m, porosity 80%)

Middle: nanofiber mesh (pore size gradient variation)

Inner layer: selective permeation membrane (molecular sieve effect)

Physical chemistry synergy mechanism

Capillary effect: Surface tension generated by micropores counteracts liquid gravity

Gas differential pressure drive: aroma molecules actively diffuse due to concentration differences

Dissolution diffusion principle: Hydrophobic materials hinder the permeation of polar liquids

Actual performance parameters

Liquid pressure resistance: can withstand 2.5m liquid column pressure without leakage

Breathable rate: 15 ± 2ml/min/cm ² (at 25 ℃)

Alcohol barrier:<0.01g/m ²/day (95% ethanol)

This technology is not only used in perfume packaging, but also in medical dressings, fuel cells and other fields. The latest developed intelligent responsive membrane can dynamically control the aroma release rate by adjusting the pore size through temperature control (such as enlarging the pore size by 8% for every 10 ℃ increase in temperature).

Leadtra Packaging is a wholesale and customized manufacturer of aluminum foil sealing film, specializing in the research and development and production of various high barrier packaging materials and easy to tear sealing packaging materials. They are widely used in food, medicine, cosmetics, and daily necessities packaging, and have many advantages such as green environmental protection, high safety, strict testing, and stable quality. If you are interested in or have any questions about us, please feel free to call us for consultation.