The production process of polypropylene tape casting film: extruder head width 1.3m, screw diameter 120mm production line production process is as follows: barrel temperature is 180 ~ 200 ℃, 200 ~ 220 ℃, 220 ~ 240 ℃, 230 ~ 240 ℃, 210 ~ 220 ℃, 230 ~ 240 ℃, 240 ~ 260 ℃; the temperature at the die head is 240 ~ 260 ℃, 240 ~ 260 ℃ for connector, 240 ~ 260 ℃ for filter and 240 ~ 250 ℃ for die lip; The temperature of the material at the head is about 240 ℃, and the temperature of the fifth section of the barrel is lower. This is the exhaust vacuum section. The extrusion temperature is increased, and the transparency and strength of the film are improved. The surface temperature of the cooling roller is generally controlled at 18-20 ℃. When the temperature of the cooling roller is low, the crystallization speed is fast, the crystallinity is small, and the transparency and optical properties of the film are good. However, if the temperature is too low, the refrigeration cost will be increased. The screw speed is 60 R / min, and the traction speed is 80 ~ 90 m / min. The increase of traction speed will increase the longitudinal strength and extrusion yield of the film, but too fast traction speed will reduce the transparency of the film. The distance between the air knife and the cooling roll should be controlled as small as possible so that the film can cling to the cooling roll. The distance between the air knife and the cooling roller should be the same, and the pressure of the air knife should be uniform. The winding tension should be appropriate. About 100N. If the tension is too high, the film is taken up too tightly, which is not conducive to aging and slitting. The tension is too small, the film is not tight, and the edge is not neat. After corona treatment, the surface tension of CPP film decreases with the increase of time. The more low molecular content of raw material is, the greater the decrease range is. Therefore, the surface tension of CPP film should be properly increased during surface treatment. The surface tension should not be too large, otherwise the film will be brittle and the mechanical properties will decline.
Polyamide tape casting film production process uses polyamide 6 as raw material. The production process of the production line with extruder screw diameter of 90mm is as follows: barrel temperature is 240 ~ 250 ℃, 250 ~ 260 ℃, 260 ~ 270 ℃, 270 ~ 280 ℃, 280 ~ 285 ℃, connector 260 ~ 270 ℃, die head temperature is 1 270 ~ 275 ℃, right 2 265 ~ 270 ℃, middle 260 ~ 265 ℃, left 1 265 ~ 270 ℃, left 2 2 65 ~ 2 270~275℃。 Polyamide 6 is a high crystalline polymer with narrow melting temperature range. The viscosity of polyamide melt is sensitive to temperature change. Therefore, the extrusion temperature of polyamide 6 tape casting film should be strictly controlled. The temperature of die head must be lower than that of extruder head, and the temperature should not fluctuate too much, otherwise the film thickness is not uniform and even material gushing will occur. The surface temperature of the first cooling roll is 90 ~ 100 ℃ and that of the second cooling roll is 20 ~ 40 ℃.
The extrusion temperature of PE tape casting film is higher than that of blow molding. The barrel temperature is 180 ~ 190 ℃, 190 ~ 200 ℃, 200 ~ 210 ℃, 210 ~ 220 ℃, 220 ~ 230 ℃. The die temperature is 1 220 ~ 225 ℃, 2 215 ~ 220 ℃, 210 ~ 215 ℃, 215 ~ 220 ℃ and 220 ~ 225 ℃ respectively. The temperature of cooling roller is 20 ~ 40 ℃. The distance between air knife and cooling roller should be small, generally 30 ~ 50mm, which can reduce the "thin diameter" of polyethylene film. When the polyethylene film needs to be printed and compounded, its surface must be corona treated, and the surface tension is greater than 40Mn / m.
Dongguan Beite packaging materials Co., Ltd. - located in Dongguan City, the world's manufacturing city, is a subsidiary of Beite packaging (China) Co., Ltd., with a plant area of 6000 square meters. It is a flexible packaging enterprise integrating R & D, production and sales. It has a complete set of domestic advanced production equipment, a scientific and humanized management system and a group of experienced technical personnel For backing, to provide customers with quality products and first-class service.
The company produces composite bags, roll film, fruit bags, aluminum foil bags, suction mouth bags, self-supporting bags, zipper bags, anti-static bags, special-shaped bags, etc., which are suitable for the internal and external packaging of food, daily chemicals, electronics, toys, medicine, cosmetics, industrial products and other industries.

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