Equipment For Producing Polypropylene Cast Film
DATE：2019/9/3 8:59:24 / READ： / SOURCE：This station
Equipment for producing polypropylene cast film
The equipment for producing polypropylene cast film is similar to the equipment for producing polyethylene cast film. The equipment generally includes an extruder, a machine head, an air knife, a cooling roller, a corona treatment device, a traction device, a winding device and a trimming recovery device.
Brief introduction
1) Extruder, generally with a screw diameter of 90-120 mm, L/D of 25-30, and a compression ratio of 4. The screw structure is a high-efficiency screw with a mixing head.
2) The machine head has a hanger type and a tube type. Common specifications for width are 1.3 m, 2.4 m, 3.3 m, 4.2 m.
3) Air knife is a narrow slit nozzle that blows compressed air. Its width is the same as the width of the head. The surface of the knife lip is smooth and the manufacturing precision is high, so as to ensure uniform airflow speed throughout the width, so that the casting film is close to the cooling roller. cylinder. The gap between the lips is 1 to 2 mm.
4) The chill roll, including the cast chill roll and the double-sided chill roll, has a diameter of 400 to 1000 mm, and the width of the head is large. The surface of the roller is plated with hard chrome, and the mirror-cleaning roller is mostly a double-screw cooling tube, which is cooled by cold water. The double-sided cooling roll cools the film further on both sides, and has a diameter smaller than that of the casting chill roll, and is 150 to 300 mm, and the surface is the same as that of the casting roll.
5) The corona treatment device corona treatment is applied to the surface of the film to a tension of 38 mN/m or more to improve printing and composite fastness.
6) A traction device that introduces a thin, cooled and surface treated polypropylene into the take-up unit. It is a pair of rollers with a diameter of about 200 mm. Generally, the upper roller is a rubber roller, the lower roller is a steel roller with a surface chrome plating, the steel roller is a driving roller or both rollers are active rollers.
7) Coiling device, CPP film winding device is generally two take-up rolls, which are used in rotation. Due to the high take-up speed, the automatic control of the winding surface tension device and the automatic cutting and rewinding device are adopted. Neat and flat.
8) Trimming recovery device, the edges of the CPP cast film are thickened at the edges due to “necking”, and the thick edges on both sides are generally removed before winding. The tool holder on the trimming device can be moved, and the material is sent to the crusher for crushing by the air blowing device, and the scrap gas is sent to the hopper, which can reduce the consumption of raw materials and improve the efficiency.
The equipment for producing polypropylene cast film is similar to the equipment for producing polyethylene cast film. The equipment generally includes an extruder, a machine head, an air knife, a cooling roller, a corona treatment device, a traction device, a winding device and a trimming recovery device.
Brief introduction
1) Extruder, generally with a screw diameter of 90-120 mm, L/D of 25-30, and a compression ratio of 4. The screw structure is a high-efficiency screw with a mixing head.
2) The machine head has a hanger type and a tube type. Common specifications for width are 1.3 m, 2.4 m, 3.3 m, 4.2 m.
3) Air knife is a narrow slit nozzle that blows compressed air. Its width is the same as the width of the head. The surface of the knife lip is smooth and the manufacturing precision is high, so as to ensure uniform airflow speed throughout the width, so that the casting film is close to the cooling roller. cylinder. The gap between the lips is 1 to 2 mm.
4) The chill roll, including the cast chill roll and the double-sided chill roll, has a diameter of 400 to 1000 mm, and the width of the head is large. The surface of the roller is plated with hard chrome, and the mirror-cleaning roller is mostly a double-screw cooling tube, which is cooled by cold water. The double-sided cooling roll cools the film further on both sides, and has a diameter smaller than that of the casting chill roll, and is 150 to 300 mm, and the surface is the same as that of the casting roll.
5) The corona treatment device corona treatment is applied to the surface of the film to a tension of 38 mN/m or more to improve printing and composite fastness.
6) A traction device that introduces a thin, cooled and surface treated polypropylene into the take-up unit. It is a pair of rollers with a diameter of about 200 mm. Generally, the upper roller is a rubber roller, the lower roller is a steel roller with a surface chrome plating, the steel roller is a driving roller or both rollers are active rollers.
7) Coiling device, CPP film winding device is generally two take-up rolls, which are used in rotation. Due to the high take-up speed, the automatic control of the winding surface tension device and the automatic cutting and rewinding device are adopted. Neat and flat.
8) Trimming recovery device, the edges of the CPP cast film are thickened at the edges due to “necking”, and the thick edges on both sides are generally removed before winding. The tool holder on the trimming device can be moved, and the material is sent to the crusher for crushing by the air blowing device, and the scrap gas is sent to the hopper, which can reduce the consumption of raw materials and improve the efficiency.
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