Metallized biaxially oriented polypropylene film offers high sealing strength and excellent vapor and oxygen barrier properties for creating airtight packaging.

Abstract

The invention proposes a metallized biaxially oriented polypropylene (mBOPP) film with high sealing strength and high water vapor and oxygen barrier properties. The film product under the invention has six layers, including: a core layer C, a T1 layer on the first side of layer C, a B layer on the top side of layer T1, a M layer on the top side of layer B, a T2 layer on the second side of layer C, and an A layer on the bottom side of layer T2. Layer C consists of polypropylene homopolymer and polypropylene elastomer; layer T1 consists of hydrated maleic-bonded polypropylene; layer B consists of ethylene vinyl alcohol; layer M consists of aluminum produced by a vacuum metallization process; Class T2 consists of polypropylene copolymer, and Class A consists of polypropylene copolymer and anti-stick additives to achieve a coefficient of friction (COF) below 0.8 and a sealing initiation temperature (SIT) below 120 °C.The mBOPP film according to the invention has a sealing strength of over 1200 g / 25 mm, an elastic modulus of less than 1300 N / mm2, a water vapor transmission rate (WVTR) of less than 0.3 g / m2.day, and an oxygen transmission rate (O2TR) of less than 0.3 cc / m2.day. The total thickness of the film is between 15 and 50 μm, and the density is between 0.55 and 0.95 g / cm3.

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