Biaxial stretching polypropylene high heat-seal film and manufacturing method thereof

[0026] Films with a thickness of 23 μm were produced. Ingredients: The thickness of the upper layer is 4 μm, and the raw materials include 88% polypropylene copolymer, 10% ethylene-acrylate copolymer and 2% synthetic silica; the thickness of the middle layer is 15 μm, and the raw materials include 88% homopolypropylene, 10% ethylene-acrylate Copolymer and 2% ethoxylated amine; the lower layer is 4 µm thick and consists of 88% copolymerized polypropylene, 10% ethylene-acrylate copolymer and 2% synthetic silica.

[0027] Film production: The biaxially oriented polypropylene high heat-sealing strength film of the present invention is produced by using a biaxially oriented co-extrusion process, wherein the temperature of the extruder: 235°C; the temperature of the casting machine: 25°C; the longitudinal stretch ratio: 493%; Longitudinal stretching preheating temperature: 112°C; longitudinal stretching temperature: 100°C; transverse stretching ratio: 920%; transverse stretching prehea

[0029] Films with a thickness of 30 μm were produced. Ingredients: the upper layer is 5 μm thick, and the raw materials include 90% polypropylene copolymer, 8% ethylene-acrylate copolymer and 2% synthetic silica; the middle layer is 15 μm thick, and the raw materials include 90% homopolypropylene, 8% ethylene-acrylate Copolymer and 2% ethoxylated amine. The lower layer is 5 μm thick, and the raw materials include 90% copolymerized polypropylene, 8% ethylene-acrylate copolymer and 2% synthetic silica.

[0030] Film production: The biaxially oriented polypropylene high heat-sealing strength film of the present invention is produced by using a biaxially oriented co-extrusion process, wherein the temperature of the extruder: 220°C; the temperature of the casting machine: 20°C; the longitudinal stretch ratio: 490%; Preheating temperature for longitudinal stretching: 120°C; stretching temperature for longitudinal stretching: 100°C; transverse stretching ratio: 850%; preheating tempera

[0032] Films with a thickness of 20 μm were produced. Ingredients: the upper layer is 3 μm thick, of which 85% copolymerized polypropylene, 13% ethylene-acrylate copolymer and 2% synthetic silica; the middle layer is 14 μm thick, of which 88% homopolypropylene, 10% ethylene-acrylate copolymer and 2% % ethoxylated amines. The lower layer is 3 μm thick and consists of 85% copolymerized polypropylene, 13% ethylene-acrylate copolymer and 2% synthetic silica.

[0033] Film production: The biaxially oriented polypropylene high heat-sealing strength film of the present invention is produced by using a biaxially oriented co-extrusion process, wherein the temperature of the extruder: 235°C; the temperature of the casting machine: 30°C; the longitudinal stretch ratio: 510%; Longitudinal stretching preheating temperature: 125°C; longitudinal stretching temperature: 110°C; transverse stretching ratio: 930%; transverse stretching preheating temperature: 180°C; transverse stretching temperatu