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Cast PA film and production process
1. Cast PA film and its raw materials
PA film has the advantages of high strength, good toughness, good transparency, good heat resistance and cold resistance, etc. It can be used in the range of -50¡«180¡æ, and can be used as high-temperature cooking materials and frozen packaging materials; it also has oxygen barrier properties A good feature is a barrier material.
The main types of PA used to produce films are: PA6, PA12, PA66, etc., packaging meat products and sausages, requiring an oxygen permeability of 20 to 80 cm3/m2¡¤24h, PA6 is the ideal packaging material.
2. Production equipment
¡ñExtruder: Generally use ¦µ90¡«150mm single screw extruder, L/D is 28¡«35, the geometric compression ratio of screw is 3.4¡«4, and mixing screw is used.
¡ñDie head: branch-pipe type heads are mostly used, and the length of the die lip shaping section is slightly longer than that of CPP.
¡ñCooling device: The cooling device of PA film is different from that of CPP, and it needs to be cooled in two steps. The casting roll is an oil-cooled roll with hot oil passing through the roll, and the surface temperature of the roll is 90-100¡ãC. Then it was cooled with a water cooling roll, and the film was cooled to room temperature. If the CPP rapid cooling method is used, the PA film will be severely wrinkled and a product with good flatness cannot be obtained.
¡ñOther equipment: Other equipment is basically the same as CPP.
3. Production process conditions
Now PA6 is an example, using a single screw extruder with ¦µ90mm, L/D is 32, the geometric compression ratio of the screw is 3.5, and PA6 with MFR of 1.8¡«2.0g/10min (Japan Dongli Company CM1021) is used. £XF), the production process conditions are as follows.
¡ñCooling temperature: The surface temperature of the first cooling roll is 90-100¡ãC, and the surface temperature of the second cooling roll is 20-40¡ãC.
4. Product quality standards
There is no national standard or ministry standard for cast PA film. The main physical and mechanical properties of the cast PA6 film produced above are as follows.
Nanjing Sumino Precision Machinery Co., Ltd. is a high-tech enterprise integrating scientific research, production and sales. It has always adhered to the business philosophy of integrity, equality, and customer benefits. In order to better improve the quality of equipment, it has entered a more professional and standardized Production track. We have established independent research and development technologies for seven categories of equipment including plastic sheet material, casting, bi-stretching, non-woven non-woven meltblown cloth, laminating film composite, recycled granulation environmental protection recycling system and coating machine manufacturing system. The center and production department provide a full set of professional technical solutions to meet the special needs of each customer. Among them, the biaxially oriented film manufacturing system includes: BOPP biaxially oriented film manufacturing system, PVC biaxially oriented shrink film production line, PET biaxially oriented film production line, BOPA biaxially oriented film production line, BOPA biaxially oriented film production line, etc.
1. Cast PA film and its raw materials
PA film has the advantages of high strength, good toughness, good transparency, good heat resistance and cold resistance, etc. It can be used in the range of -50¡«180¡æ, and can be used as high-temperature cooking materials and frozen packaging materials; it also has oxygen barrier properties A good feature is a barrier material.
The main types of PA used to produce films are: PA6, PA12, PA66, etc., packaging meat products and sausages, requiring an oxygen permeability of 20 to 80 cm3/m2¡¤24h, PA6 is the ideal packaging material.
2. Production equipment
¡ñExtruder: Generally use ¦µ90¡«150mm single screw extruder, L/D is 28¡«35, the geometric compression ratio of screw is 3.4¡«4, and mixing screw is used.
¡ñDie head: branch-pipe type heads are mostly used, and the length of the die lip shaping section is slightly longer than that of CPP.
¡ñCooling device: The cooling device of PA film is different from that of CPP, and it needs to be cooled in two steps. The casting roll is an oil-cooled roll with hot oil passing through the roll, and the surface temperature of the roll is 90-100¡ãC. Then it was cooled with a water cooling roll, and the film was cooled to room temperature. If the CPP rapid cooling method is used, the PA film will be severely wrinkled and a product with good flatness cannot be obtained.
¡ñOther equipment: Other equipment is basically the same as CPP.
3. Production process conditions
Now PA6 is an example, using a single screw extruder with ¦µ90mm, L/D is 32, the geometric compression ratio of the screw is 3.5, and PA6 with MFR of 1.8¡«2.0g/10min (Japan Dongli Company CM1021) is used. £XF), the production process conditions are as follows.
¡ñCooling temperature: The surface temperature of the first cooling roll is 90-100¡ãC, and the surface temperature of the second cooling roll is 20-40¡ãC.
4. Product quality standards
There is no national standard or ministry standard for cast PA film. The main physical and mechanical properties of the cast PA6 film produced above are as follows.
Film thickness: 30¦Ìm; longitudinal tensile strength: 70MPa; longitudinal elongation at break: 280%; transverse tensile strength: 60MPa; transverse elongation at break: 260%.
Company Profile
Nanjing Sumino Precision Machinery Co., Ltd. is a high-tech enterprise integrating scientific research, production and sales. It has always adhered to the business philosophy of integrity, equality, and customer benefits. In order to better improve the quality of equipment, it has entered a more professional and standardized Production track. We have established independent research and development technologies for seven categories of equipment including plastic sheet material, casting, bi-stretching, non-woven non-woven meltblown cloth, laminating film composite, recycled granulation environmental protection recycling system and coating machine manufacturing system. The center and production department provide a full set of professional technical solutions to meet the special needs of each customer. Among them, the biaxially oriented film manufacturing system includes: BOPP biaxially oriented film manufacturing system, PVC biaxially oriented shrink film production line, PET biaxially oriented film production line, BOPA biaxially oriented film production line, BOPA biaxially oriented film production line, etc.
Company Address: No. 11, Kaifeng Road, Moling Street, Jiangning District, Nanjing City, Jiangsu Province