Location:Home > News information > Solution > 正文
Contact
Dongguan Baoding Precision Instrument Co. Ltd.
Miss.Cai 13717346368
Telephone: 0769-85588096Fax: 0769-82688299
Email: 13717346368@163.com
URL: www.baodingyiqi.com
Address: No. nine Park Avenue, Houjie Town, Guangdong, Dongguan, China, No. 23
Temperature index and control method of film blowing machine
According to the theory of plastic melting, the extruder screw of the film blowing machine is divided into three sections: the feeding section, the melting section and the homogenizing section. At the end of the feeding section, the temperature of the melt should be a viscous flow temperature. Various film blowing machine resin viscosity temperature were PP:164-175 degrees Celsius, PE:105-135 degrees Celsius, PA:195-210 degrees celsius.
In the feeding section entrance, to a lower temperature, prevent the resin viscous flow inlet is blocked, in addition, the continuous compression in the feeding section resin, it is necessary to discharge the air from the feeding port. According to the different structure of the equipment, the feeding port is not electrically heated, but the heat transfer through the barrel, the feed temperature is about 50-90 degrees. In this way, the temperature of the feeding section is determined. At the entrance of 50-90, the end is equal to the melting point or viscous flow temperature, in which the temperature can be determined as the linear temperature. When the melting section of the film blowing machine starts, the temperature of the film blowing machine can reach the viscous flow temperature to melt. Then continue to compress and increase the melting layer, we need to make the temperature increasing, resin molecular chain length, polymer with different energy of thermal motion has all melted, so to melt film blowing machine end temperature is established, can be set in the section on other parts of linear heating.
In the homogenization section, mainly the re melt homogenization and quantitative film blowing machine pressure constant temperature output of the melt, the temperature can be kept constant, or the temperature of the melting section of the end of a little bit higher (2-5 degrees).
For the film by film, film blowing machine head section of the low temperature, but not lower than the temperature of viscous flow, for the film and normal film. Melt from the mold out of the mouth to have a certain viscosity, the film blowing machine will not break the film, such as the collapse of the film occurs. In general, it is the end of the section are low 10-30 degrees, from homogeneous section to touch the temperature but also can be regarded as the arithmetic of temperature drop.
The control points for the extrusion temperature are:
Different kinds of resin, film blowing machine process temperature is different;
The same kind of resin, the model and the melt index are different, the film blowing process temperature is different, the index is good fluidity, low temperature.
The same resin film, different thickness of film blowing machine, process temperature is different, the thick film blowing machine processing technology, high temperature, touch the outlet temperature can also be a little higher, is conducive to reducing viscosity, improve productivity.
In the feeding section entrance, to a lower temperature, prevent the resin viscous flow inlet is blocked, in addition, the continuous compression in the feeding section resin, it is necessary to discharge the air from the feeding port. According to the different structure of the equipment, the feeding port is not electrically heated, but the heat transfer through the barrel, the feed temperature is about 50-90 degrees. In this way, the temperature of the feeding section is determined. At the entrance of 50-90, the end is equal to the melting point or viscous flow temperature, in which the temperature can be determined as the linear temperature. When the melting section of the film blowing machine starts, the temperature of the film blowing machine can reach the viscous flow temperature to melt. Then continue to compress and increase the melting layer, we need to make the temperature increasing, resin molecular chain length, polymer with different energy of thermal motion has all melted, so to melt film blowing machine end temperature is established, can be set in the section on other parts of linear heating.
In the homogenization section, mainly the re melt homogenization and quantitative film blowing machine pressure constant temperature output of the melt, the temperature can be kept constant, or the temperature of the melting section of the end of a little bit higher (2-5 degrees).
For the film by film, film blowing machine head section of the low temperature, but not lower than the temperature of viscous flow, for the film and normal film. Melt from the mold out of the mouth to have a certain viscosity, the film blowing machine will not break the film, such as the collapse of the film occurs. In general, it is the end of the section are low 10-30 degrees, from homogeneous section to touch the temperature but also can be regarded as the arithmetic of temperature drop.
The control points for the extrusion temperature are:
Different kinds of resin, film blowing machine process temperature is different;
The same kind of resin, the model and the melt index are different, the film blowing process temperature is different, the index is good fluidity, low temperature.
The same resin film, different thickness of film blowing machine, process temperature is different, the thick film blowing machine processing technology, high temperature, touch the outlet temperature can also be a little higher, is conducive to reducing viscosity, improve productivity.
