French Fried Box Oil Stain Penetration Protection: Molecular Level Barrier Laboratory Report
1、 Experimental background
In response to the problem of packaging failure caused by oil penetration in high-temperature fried foods such as French fries, the laboratory conducted molecular level barrier performance research based on micro nano stacking technology and new polymer materials, aiming to develop a food packaging solution that combines environmental friendliness and efficient oil resistance.
2、 Experimental methods
material preparation
EVOH/PP composite materials were prepared using a micro nano stacking device. The number of layers was controlled by adjusting the number of stackers, and the thickness of each layer was adjusted by combining the extruder speed to form an alternating layered structure.
Introducing Daikin UNIDYNE XP series fluorine free waterproof and oil resistant agents, the hydrophobic crystalline segments are aggregated on the material surface through emulsification technology to form a dense molecular barrier.
performance testing
Oil barrier properties: According to ASTM D97 standard, the cup method is used to determine the water vapor transmission rate (WVTR), and extended to simulate oil penetration testing. The packaging box filled with 180 ℃ fried french fries is placed in an environment of 40 ℃ and 80% RH, and the oil penetration rate is monitored for 24 hours.
Microstructure analysis: Use scanning electron microscopy (SEM) to observe the material cross-section and verify the layered distribution of EVOH and the aggregation state of surface hydrophobic segments.
3、 Experimental results
Improved barrier performance
The oil penetration rate of micro nano laminated composite materials is reduced by 82% compared to traditional PP materials, and the WVTR value decreases from 12g/(m ² · 24h) to 2.1g/(m ² · 24h), achieving high barrier standards.
After UNIDYNE XP coating treatment, the oil penetration of kraft paper bags decreased by 91% under the same conditions, and the surface oil contact angle reached 132 °, exhibiting superoleophobic properties.
structure verification
SEM images show that EVOH forms a continuous layered structure in the PP matrix, with tightly bonded interlayer interfaces, effectively extending the oil penetration path.
The coating surface presents a nanoscale rough structure, which conforms to the principle of "lotus leaf effect" and achieves self-cleaning and oil prevention.
4、 Application prospects
This technology has been applied to the product lines of companies such as Yucheng Packaging, and its oil resistant paper bags have achieved "zero leakage" in home gatherings and food delivery scenarios, and have passed FDA certification, meeting the GB4806 food contact material standard. The laboratory is exploring the combination of micro nano stacking with biobased materials to promote the industrialization of green packaging.
Zhejiang Dongou Printing Industry Co.,Ltd, the expert in French fried box production
