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Analysis of temperature index and control method of film blowing machine in small blow molding machi
Analysis of temperature index and control method of film blowing machine in small blow molding machine factory
According to the melting theory of plastics, the extruder screw is divided into three parts: charging section, melting section and homogenizing section. At the end of the charging section, when entering the melting section, the temperature shall be the viscous flow temperature according to the melting theory. All kinds of blowing resin viscous flow temperature was PP:164-175 degrees Celsius, PE:105-135 degrees Celsius, PA:195-210 degrees celsius.
In the feeding section, the temperature is lower, to prevent resin viscous flow blocking the feed port, the feed temperature of about 120-165 degrees. At the end of the feeding section is equal to the melting point or the temperature of viscous flow, in this section can be set as the heating temperature of geometric alignment; melting section starts when the temperature reaches the temperature of viscous flow to melt, for crystalline resin, temperature of viscous flow is equal to the melting point temperature. Then need continuous heating temperature (the temperature is about 150-200 degrees), in order to make the polymer molecular chain length, different heat energy has melting; in homogeneous section, re melting homogenizing and quantitative pressure constant output melt, the temperature can be kept constant, or the ratio of the melting temperature is only slightly at the end of period increased (2-5 degrees).
For blowing film, through the head section of the low temperature, for the film and normal blowing, not rupture of membrane, membrane collapse phenomenon. Generally, it is about 10 degrees lower than the end of the homogenized section. From the homogenizing section to touch the temperature but also can be regarded as the arithmetic of temperature drop.
Control points for extrusion temperature are:
Different resin, blown film process temperature is different;
The same kind of resin, the model and the melt index are different, the process temperature of blowing film is different, the melting index is large, the flowability is good, and the temperature is low.
The same resin, blown film thickness, different process temperature is also different. Processing thick film, the process temperature can be higher, and the temperature of the mouth can also be a little higher, it is conducive to reducing viscosity, conducive to resin flow.
According to the melting theory of plastics, the extruder screw is divided into three parts: charging section, melting section and homogenizing section. At the end of the charging section, when entering the melting section, the temperature shall be the viscous flow temperature according to the melting theory. All kinds of blowing resin viscous flow temperature was PP:164-175 degrees Celsius, PE:105-135 degrees Celsius, PA:195-210 degrees celsius.
In the feeding section, the temperature is lower, to prevent resin viscous flow blocking the feed port, the feed temperature of about 120-165 degrees. At the end of the feeding section is equal to the melting point or the temperature of viscous flow, in this section can be set as the heating temperature of geometric alignment; melting section starts when the temperature reaches the temperature of viscous flow to melt, for crystalline resin, temperature of viscous flow is equal to the melting point temperature. Then need continuous heating temperature (the temperature is about 150-200 degrees), in order to make the polymer molecular chain length, different heat energy has melting; in homogeneous section, re melting homogenizing and quantitative pressure constant output melt, the temperature can be kept constant, or the ratio of the melting temperature is only slightly at the end of period increased (2-5 degrees).
For blowing film, through the head section of the low temperature, for the film and normal blowing, not rupture of membrane, membrane collapse phenomenon. Generally, it is about 10 degrees lower than the end of the homogenized section. From the homogenizing section to touch the temperature but also can be regarded as the arithmetic of temperature drop.
Control points for extrusion temperature are:
Different resin, blown film process temperature is different;
The same kind of resin, the model and the melt index are different, the process temperature of blowing film is different, the melting index is large, the flowability is good, and the temperature is low.
The same resin, blown film thickness, different process temperature is also different. Processing thick film, the process temperature can be higher, and the temperature of the mouth can also be a little higher, it is conducive to reducing viscosity, conducive to resin flow.
