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In the extrusion line, high-temperature melt pressure sensors play an important role in improving melt quality, improving production safety, and protecting production equipment. At the same time, the high-temperature melt pressure sensor is a very sensitive element. Only proper installation and maintenance can make full use of it. Tools/Raw Materials Sensors, Wire Brushes, Soft Cloth, Drills Procedure/Method Proper Installation Normally high-temperature melt pressure sensors are damaged due to improper installation locations. If the sensor is forcibly installed in a hole that is too small or has an irregular shape, it may cause the shock film of the sensor to be damaged by impact. Selecting a suitable tool for machining the mounting holes facilitates the control of the size of the mounting holes. In addition, a suitable mounting torque facilitates the formation of a good seal. However, if the installation torque is too high, it can easily cause the high-temperature melt pressure sensor to slip off. In order to prevent this from happening, it is usually applied to the thread portion of the sensor before the sensor is installed. After using this compound, the sensor is difficult to move even if the mounting torque is high.
Check the size of the mounting hole If the size of the mounting hole is not suitable, the threaded portion of the high-temperature melt pressure sensor can easily be worn during installation. This will not only affect the sealing performance of the device, but also make the sensor not fully function, and may even cause potential safety hazards. Only suitable mounting holes can avoid thread wear (thread industry standard 1/2-20 UNF2B). Mounting holes can often be used to test the mounting holes to make appropriate adjustments.
Keeping the mounting holes clean Keeping the mounting holes clean and preventing clogging of the melt are important to ensure proper equipment operation. All high temperature melt pressure sensors should be removed from the barrel before the extruder is cleaned to avoid damage. When the sensor is removed, the molten material may flow into the mounting hole and harden. If these residual melts are not removed, the top of the melt pressure sensor may be damaged when the high temperature melt pressure sensor is installed again. The cleaning kit can remove these frit residues. However, the repeated cleaning process may deepen the damage caused by the mounting holes to the high temperature melt pressure sensor. If this happens, measures should be taken to increase the position of the high temperature melt pressure sensor in the mounting hole.
Choosing the right location When the high temperature melt pressure sensor is installed too close to the line, the unmelted material may wear on the top of the sensor; if the high temperature melt pressure sensor is installed too far behind, the melt at high temperature A stagnation zone of molten material may occur between the pressure sensor and the screw stroke. The molten material may be degraded there. The pressure signal may also be distorted. If the high-temperature melt pressure sensor is too deep into the barrel, the screw may rotate. Touching the top of the high temperature melt pressure sensor causes damage. In general, the high temperature melt pressure sensor can be located on the barrel in front of the screen, in front of the melt pump, or in the mold.
Careful cleaning All high temperature melt pressure sensors should be removed before cleaning the extruder barrel with wire brushes or special compounds. Because both of these cleaning methods may cause damage to the high-temperature melt pressure sensor's diaphragm. When the barrel is heated, the high-temperature melt pressure sensor should also be disassembled and wiped on top with a soft cloth that will not wear, while the holes in the high-temperature melt pressure sensor also require a clean drill and guide bush. Clean up.
Keeping Dry While high-temperature melt pressure sensor circuits are designed to withstand harsh extrusion processing environments, most high-temperature melt pressure sensors are not absolutely waterproof and do not work well under humid conditions. Therefore, it is necessary to ensure that the water in the water cooling device of the barrel of the extruder does not leak, otherwise the sensor will be adversely affected. If the sensor has to be exposed to water or a humid environment, select a special high-temperature melt pressure sensor that is extremely water-resistant.
Avoiding Low-Temperature Interference In the extrusion production process, for the plastic raw material, there should be sufficient "saturation time" from the solid to the molten state. If the extruder has not reached the operating temperature before starting production, the high-temperature melt pressure sensor and the extruder will suffer a certain degree of damage. In addition, if the high temperature melt pressure sensor is removed from the cold extruder, the material may adhere to the top of the high temperature melt pressure sensor causing damage to the diaphragm. Therefore, before removing the high-temperature melt pressure sensor, it should be confirmed that the temperature of the barrel is sufficiently high and the material inside the barrel is in a softened state.
Prevent pressure overload Even if the overload design of the sensor pressure measurement range can reach 50% (override the maximum range ratio), it should be avoided from the safety point of view of the equipment operation. It is better to select the high temperature where the measured pressure is within the measuring range. Melt pressure sensor. Under normal circumstances, the optimum range of the selected high temperature melt pressure sensor should be twice the measured pressure, so that the high temperature melt pressure sensor can be prevented from being damaged even if the extruder is operated under extremely high pressure. In the extrusion line, melt pressure sensors play an important role in improving melt quality, increasing production safety, and protecting production equipment. At the same time, the diaphragm is a very sensitive element of the melt pressure sensor. Only proper installation and maintenance can make full use of its function.
In the extrusion process, some of the product's quality standards (such as dimensional accuracy or the surface smoothness of mineral fillers added to the surface) require optimal control of the extrusion pressure. The melt pressure sensor diaphragm achieves this. The important components required. By arranging the melt pressure sensor and the pressure control device at the entrance of the mold, the yield can be made more stable and the waste of materials can be reduced. Melt pressure sensors play an important role in improving melt quality, increasing production safety, protecting production equipment, and extending the service life.
In addition, measuring the pressure through the filter and the melt pump is also very important to ensure the safety of production and optimize the performance of the equipment. If the melt gets stuck in the mold, the sensor below the filter will warn the operator. When the sensor on the filter travels an alarm, it indicates that the pressure inside the extruder is too high, which may cause excessive wear on the screw. For manufacturers applying melt pumps, it is necessary to measure the inlet pressure and outlet pressure of the melt to ensure that the melt can continuously flow into the mold, because any obstruction may cause damage to the melt pump.
The raw material, processing, heat treatment, and plating treatment of the diaphragm are directly related to the service life and temperature drift of the diaphragm.
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How to use and maintain the high temperature melt pressure sensor correctly?
Xiaogan City Wuyue Sensor Co., Ltd. In the extrusion line, high-temperature melt pressure sensors play an important role in improving the quality of the melt, improving the safety of production, and protecting production equipment. At the same time, the high-temperature melt pressure sensor is also a very sensitive element, with only proper installation and maintenance...