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PVC extrusion (how to control the temperature On)
by：CSSSLD
2021-01-23
Said before the production of Pvc extrusion machine to overall control problem of temperature, now let's look at Pvc extrusion machine equipment sectional check the temperature of the parts needed to control and points for attention.
we first to get to know feeder section temperature: feeder period of electrical heating device is hot feeding tube, information display, temperature is the temperature of the cylinder, this paragraph is not raw material temperature. Raw material temperature usually far below information display. When raw materials according to the feeder just came into the extruder screw extruder, only 30 ℃ to 40 ℃ temperature fluctuation and the extruder screw cutting caused by tropical to raw material rising from the plasticizing ( Vitrification) Temperature also has very big difference, the other raw materials through the compressor, to vent, raw materials should be in the heating area from the glassy state to flow to complete the conversion process, are required to show & other The orange peel shape & throughout; That no powder material, and tightly wrapped in the spiral groove surface, not by vacuum pump to pull from the vent or will the vent plug, and therefore the responsibility of the main feeder segment is the outside heat, set the temperature should be higher than normal, as much as possible is advantageous for the electric heater ring to give adequate external heat raw materials. The electric heating device opened and closed state switching frequency will be relatively fast, even will not pause to work.
because of raw materials into the feeder segment, from mouth to die extrusion has a period of time, to add to prevent raw materials in the feeding mouth bridge or on the inner wall of the internal cylinder wall sticking, set the temperature is not suitable for too high, should be based on temperature above 185 ℃ for the best. Although feeder segment set the temperature of the lower, such as the temperature is set to 170 ℃ or lower, also can produce quality qualified products. But because of external heat is relatively less, overly rely on cutting the heat to raise the temperature of the solution, the screw tubes loss increase, will greatly reduce the extruder screw and the service life of screw barrel, it can only be penny wise and pound foolish. According to our long time in PVC extrusion equipment maintenance medium survey found that only after one to two years ( There is less than one year) Work time, screw tubes will have better wear, the damaged parts of most of them are focused on the shrinkage of large double-headed screw ghatpot after the first single head screw or is it the first ErChan head screw position and the location of the other in the metering section of wide, the larger the degree of wear up to 3 mm to 2 mm, so it is sometimes extrusion production will find that there is a yellow line ( Because of the raw materials flow back, under the condition of high temperature waiting time is too long to) , such as air gap do adjustment again due to some of extruder screw and screw tubes location point produce friction, production with black stripes and machine equipment from different ring, affect the normal production work, only changing a screw tubes with screw.
this kind of situation, although the manufacturer and selection of material and improper heat treatment are closely related, but the key to a little reason is due to set out the temperature is too low, lead to the position of the cutting too strong and thus increase the degree of wear and tear. Feeding machine selects the high setting temperature not only conducive to the melting of raw materials, and can be flexible to use external heat to reduce the wastage of the cutting of PVC extrusion machine. In many practical experience shows that in the feed speed, extrusion rate and setting up the measurement temperature does not change the premise condition, the moderate increase of feeder set temperature, can reasonably reduce metrological verification period of display of temperature and set temperature, the temperature difference between the two, fully proved feeder section temperature to a certain extent, can adjust the effect of cutting heat.
the second is the temperature of the compressed section: compression of raw materials into the cutting effect is very big, under the extruder screw shear stress effect, the temperature quickly. Set the temperature higher, which is beneficial to reduce the viscosity of raw materials, the flow speed is accelerated, as feeder section, can reduce the cutting heat damage.
the third part of the melting temperature, melting period of raw materials base molten, due to the transition of the spiral groove capacity, Usually shrink ratio less than 1) , melt pressure is reduced step by step, can give full play to the accused of moderate exhaust pipe. Set the temperature and the compression section of the same or a little higher, to avoid melt temperature drop, because the melt pressure reduction can make the temperature of the melt is also reduced.
is temperature measurement section 4: metering section showed that the temperature of the information is not the temperature of the raw materials. Only raw materials on cutting heat transfer when the feeding barrel temperature, material temperature is usually higher than the temperature of the display. Set temperature goal is not to give out heat, but in order to prevent external excessive heat, and using cylinder cooling equipment and the extruder screw oil temperature to moderate adjustment to unnecessary heat transfer, avoid raw materials dissolved. Some serious damaged cylinder this a refrigeration equipment, long after the machine start to work for a while can maintain temperature does not rise. So the set is not suitable for high temperature. When the quantity is small, show the temperature too low, you can look at the situation to improve the cylinder, setting temperature of the extruder screw or feeder rate in order to enhance cutting calories.
this time we just cylinder was introduced in detail, the compression section, melting, metering section of the four stages of how to control and adjust the temperature, what temperature is the most conducive to production, it is vital to do PVC extrusion factory. I hope these knowledge can help you to solve some production problems, later we will go to introduce relevant information.
we first to get to know feeder section temperature: feeder period of electrical heating device is hot feeding tube, information display, temperature is the temperature of the cylinder, this paragraph is not raw material temperature. Raw material temperature usually far below information display. When raw materials according to the feeder just came into the extruder screw extruder, only 30 ℃ to 40 ℃ temperature fluctuation and the extruder screw cutting caused by tropical to raw material rising from the plasticizing ( Vitrification) Temperature also has very big difference, the other raw materials through the compressor, to vent, raw materials should be in the heating area from the glassy state to flow to complete the conversion process, are required to show & other The orange peel shape & throughout; That no powder material, and tightly wrapped in the spiral groove surface, not by vacuum pump to pull from the vent or will the vent plug, and therefore the responsibility of the main feeder segment is the outside heat, set the temperature should be higher than normal, as much as possible is advantageous for the electric heater ring to give adequate external heat raw materials. The electric heating device opened and closed state switching frequency will be relatively fast, even will not pause to work.
because of raw materials into the feeder segment, from mouth to die extrusion has a period of time, to add to prevent raw materials in the feeding mouth bridge or on the inner wall of the internal cylinder wall sticking, set the temperature is not suitable for too high, should be based on temperature above 185 ℃ for the best. Although feeder segment set the temperature of the lower, such as the temperature is set to 170 ℃ or lower, also can produce quality qualified products. But because of external heat is relatively less, overly rely on cutting the heat to raise the temperature of the solution, the screw tubes loss increase, will greatly reduce the extruder screw and the service life of screw barrel, it can only be penny wise and pound foolish. According to our long time in PVC extrusion equipment maintenance medium survey found that only after one to two years ( There is less than one year) Work time, screw tubes will have better wear, the damaged parts of most of them are focused on the shrinkage of large double-headed screw ghatpot after the first single head screw or is it the first ErChan head screw position and the location of the other in the metering section of wide, the larger the degree of wear up to 3 mm to 2 mm, so it is sometimes extrusion production will find that there is a yellow line ( Because of the raw materials flow back, under the condition of high temperature waiting time is too long to) , such as air gap do adjustment again due to some of extruder screw and screw tubes location point produce friction, production with black stripes and machine equipment from different ring, affect the normal production work, only changing a screw tubes with screw.
this kind of situation, although the manufacturer and selection of material and improper heat treatment are closely related, but the key to a little reason is due to set out the temperature is too low, lead to the position of the cutting too strong and thus increase the degree of wear and tear. Feeding machine selects the high setting temperature not only conducive to the melting of raw materials, and can be flexible to use external heat to reduce the wastage of the cutting of PVC extrusion machine. In many practical experience shows that in the feed speed, extrusion rate and setting up the measurement temperature does not change the premise condition, the moderate increase of feeder set temperature, can reasonably reduce metrological verification period of display of temperature and set temperature, the temperature difference between the two, fully proved feeder section temperature to a certain extent, can adjust the effect of cutting heat.
the second is the temperature of the compressed section: compression of raw materials into the cutting effect is very big, under the extruder screw shear stress effect, the temperature quickly. Set the temperature higher, which is beneficial to reduce the viscosity of raw materials, the flow speed is accelerated, as feeder section, can reduce the cutting heat damage.
the third part of the melting temperature, melting period of raw materials base molten, due to the transition of the spiral groove capacity, Usually shrink ratio less than 1) , melt pressure is reduced step by step, can give full play to the accused of moderate exhaust pipe. Set the temperature and the compression section of the same or a little higher, to avoid melt temperature drop, because the melt pressure reduction can make the temperature of the melt is also reduced.
is temperature measurement section 4: metering section showed that the temperature of the information is not the temperature of the raw materials. Only raw materials on cutting heat transfer when the feeding barrel temperature, material temperature is usually higher than the temperature of the display. Set temperature goal is not to give out heat, but in order to prevent external excessive heat, and using cylinder cooling equipment and the extruder screw oil temperature to moderate adjustment to unnecessary heat transfer, avoid raw materials dissolved. Some serious damaged cylinder this a refrigeration equipment, long after the machine start to work for a while can maintain temperature does not rise. So the set is not suitable for high temperature. When the quantity is small, show the temperature too low, you can look at the situation to improve the cylinder, setting temperature of the extruder screw or feeder rate in order to enhance cutting calories.
this time we just cylinder was introduced in detail, the compression section, melting, metering section of the four stages of how to control and adjust the temperature, what temperature is the most conducive to production, it is vital to do PVC extrusion factory. I hope these knowledge can help you to solve some production problems, later we will go to introduce relevant information.
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