Chinese blown film machineThe control method of what?
ABA blown film machineManufacturers according to the theory of plastic melt blown film machine is divided into three sections: charging, melting, homogenization section., in the end of the feeding section into the melting period begins, according to the theory of melt, its temperature should be a viscous flow.Variety of blown film temperature viscous flow respectively, PP: 164-175 degrees Celsius, PE: 105-135 degrees Celsius, PA: 195-210 degrees Celsius.
In homogenization, mainly to melt homogenization and quantitative output constant pressure constant temperature melt, which can keep constant temperature, or molten end slightly a little higher temperature (2-5 degrees or so).
For blown film film, required by touching someone period of lower temperature, but can't lower than the viscous flow temperature, easy to carry membrane and normal blown film.Melt out of the gate to have certain viscosity, not to break the membrane, the phenomenon such as falling film.Generally, it is lower than homogenization section at the end of 10 to 30 degrees, from homogenization section to touch the mouth temperature can also be seen as temperature reduction arithmetic.
The entrance of the loading period, in the hope that lower temperature, prevent chocked up with resin viscous flow inlet, in addition, the charging period of resin continuously compressed, pour it out with air discharge through the loading port.According to different device structures, feeding mouth not to carry on the electrical heating, heat transfer, but through the barrel feeding mouth temperature of about 50-90 degrees.In this way, feed temperature is identified.At the entrance of 50-90 degrees, the end is equal to the melting point or viscous flow temperature, temperature on the segment can be classified as geometric linear heating up.Melting period at the start of the temperature of viscous flow to melting temperature, crystallization for resin, viscous flow temperature is equal to the melting temperature.Compression, and then increasing melt layer, it needs to temperature rising, to make the resin molecular chain length, different thermal motion energy of the polymer are fused, and thus established after the end of the period of temperature to the melting, can be classified as other parts in the segment is linear heating up.
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