The importance of HDPE high speed film blowing machine temperature

Release time：

2020-10-08

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According to the plastic melting theory, the extruder screw of HDPE high-speed film blowing machine is divided into three sections: feeding section, melting section, homogenization section, at the end of the feeding section, into the beginning of the melting section, according to the melting theory, its temperature should be viscous flow temperature. At the inlet of the feeding section of the film blowing machine, the temperature is lower to prevent resin viscous flow from blocking the feed port. In addition, the resin in the feeding section is constantly compressed, and the air should be discharged from the feeding port backwards. According to the different structure of the film blowing machine equipment, the feeding port is not electrically heated, but heat transfer through the barrel, and the temperature of the feeding port is about 50-90 degrees. In this way, the temperature of the feeding section is determined.

The entrance is 50-90 degrees, and the end is equal to the melting point or viscous flow temperature, which can be set as temperature isometric linear heating. At the beginning of the melting section of the HDPE high-speed film blowing machine, the temperature reaches the viscous flow temperature to melt. For crystallizing resin, the viscous flow temperature is equal to the melting point temperature, and then the melting layer is continuously compressed and increased, and the temperature needs to be continuously increased. In order to make the resin molecular chain length is different, the polymer of different thermal energy has been fused, so the temperature to the end of the melting section is established, can be determined to be in the other parts of the section is linear heating.

In the homogenization section, the main is remelting homogenization and quantitative constant pressure constant temperature output melt, the temperature of this section can remain constant, or the temperature at the end of the melting section increases slightly (about 2-5 degrees), for the film blowing machine, the temperature through the die head section is required to be lower, but not lower than the viscous flow temperature, easy to lift film and normal film blowing, melt out of the die mouth to have a certain viscosity, It will not break the film, collapse the film and other phenomena occur. In general, HDPE high-speed film blowing machine is about 10-30 degrees lower than the end of the homogenization section. The temperature from the homogenization section to the touch mouth can also be regarded as isometric temperature drop.

HDPE high-speed film blowing machine use precautions

HDPE high speed film blowing machine how to compare the quality

HDPE high-speed film blowing machine use precautions

HDPE high speed film blowing machine how to compare the quality