The microporous polypropylene film was developed through a biaxial film stretching process using a precursor polypropylene sheet with an enriched metastable crystal form. The specific crystal structure was induced by an appropriate nucleating agent at the ppm-level. The subsequent proprietary stretching induces a change in the crystal form and forms highly connect nano-micro voids. The stretching conditions play an important role in tailoring the ultra-high gas permeable capability.
The developed pore morphology was revealed as interconnected micropores that allow moisture to be transported through the film at extremely high rates, i.e. WVTR* > 13,000 g.m-2.d-1 (film thickness ≈ 15 µm), but with water resistance due to the hydrophobicity of polypropylene. Almost 100% polypropylene (PP). No inorganic fillers are used. Porous PP membrane have a soft touch/non-plastic feeling as compared to BOPP film. *Water Vapour Transmission Rate (WVTR) were tested by Permatran-W Model 101K MOCON (USA)
Microporous Polypropylene Membrane/ Film may potentially be applicable for: Applicable as selective membranes, battery separators, and fresh produce packaging Widely applied in medical device packaging or construction industry processes Other potential areas are also possible and can be discussed at length. Please visit our booth to discuss other possible uses.
The Microporous Polypropylene Membrane/Film has several advantages: Biaxial film stretching process is a cost effective method to produce microporous film The dry/solventless process is environmental friendly The interconnected micropores provide ultra high gas/moisture transmission