Extrusion coating compound extruder
DATE：2019/10/14 9:24:37 / READ： / SOURCE：This station
Extrusion coating compound extruder
The main equipment of the extrusion coating composite machine is a T-die extruder. The extruder consists of a barrel and a screw. The 4 to 6-stage heater is used outside the barrel. Generally, cast aluminum heaters are used. The heating resistance wire and the anti-infrared light heating material are simultaneously casted in a block heating element by using aluminum alloy, which can well protect the heating element from oxidative degradation in the air and shorten the service life, and only need to install the cast aluminum heater to the use. The outside of the extruder barrel can be. In order to facilitate the cooling and control, the 4~6 heating section outside the barrel is also equipped with a blower. When the temperature exceeds the set value, the blower automatically turns on the blast cooling while turning off the heater. When the temperature is too low, the heater switch is automatically turned on to perform heating while the blower is stopped to maintain a constant temperature. The temperature control mode can be a plurality of types such as a two-position control mode, a time proportional control mode, a continuous proportional control mode, a composite control mode, a PI control mode, or a PID control mode. The choice of control method should be considered according to the accuracy, economy and easy maintenance of maintenance. In general, in order to improve the wear resistance, a cylinder can be used. In the case where the processing corrosion is particularly large and mechanical corrosion resistance is required to be particularly good, an extruder lined with a high-grade alloy steel such as nickel-molybdenum should be used. The extruder screw has a difference between a mutant screw (so-called nylon screw) and a tapered screw (so-called gauge screw). Recently, due to the diversification of extrusion-coated composite resins, there have been many applications for progressive-type screws that can accommodate various resins. The mutant screw cannot meet the above requirements in terms of high processing speed, high processing accuracy, high level of productivity, and variety of resins, and the use of a mutant screw is becoming less and less. For the screw processing LDPE material, it is best to use a specially designed extruder, mainly considering the following points:
The power of the main motor is greatly improved, which is about 2.5 to 3 times of the power of processing ordinary PE. For example, the motor used in the screw extruder of 65m/m is 15-20 kW, and the processing of LLDPE should be about 40-50 kW; the screw speed is fast, The production speed is high. For this reason, the screw should be specially designed to have an efficient mixing effect and can be adapted to process LLDPE screws. For example, a pin and a mixing head are provided in the tapered screw metering section. It is possible to reserve 2 to 3 screws for different raw materials on one extruder, which is convenient for replacing the screw.
The UB screw manufactured by Mitsubishi Heavy Industries Co., Ltd. can be used for processing extrusion of various resins such as PE, PP, EVA, EAA, EMA, Surlyn, TPX, EVAL, nylon, PET, etc. The extrusion is stable and the mixing and dispersibility is good. , no gelation, a good uniform melt, high extrusion efficiency (ratio of extrusion to the necessary motor power), is a good screw, which is a kind of screw in the main groove The auxiliary screw groove smaller than the main screw groove, so that the solid resin particles which are advanced along the barrel wall are heated into the auxiliary screw groove by the liquid resin which is melted by the heat, and the solid and the liquid advance in the two screw grooves respectively to improve the heat efficiency. No bubbles or gels are produced, and the temperature and viscosity distribution of the resin can be uniform. The universal L/D is 28 and the special purpose is up to 33.
T-die must have the following properties: uniform thickness and temperature required for forming; high uniformity in wide resin melt viscosity and shear rate; highly convenient film width adjustment device; good Film edge curling adjustment function (ビ-ド crimping); prevention of neckin function; no melt orientation of the melt, adhesion of foreign matter; no partial stagnation of the melt; thickness adjustment should be high Accuracy and convenience; easy to disassemble and assemble. Generally, in order to make the internal pressure distribution of the T-die uniform, use a branch pipe, a manifold, and
A melt film having a uniform thickness is formed to flow out of the lip.
The main equipment of the extrusion coating composite machine is a T-die extruder. The extruder consists of a barrel and a screw. The 4 to 6-stage heater is used outside the barrel. Generally, cast aluminum heaters are used. The heating resistance wire and the anti-infrared light heating material are simultaneously casted in a block heating element by using aluminum alloy, which can well protect the heating element from oxidative degradation in the air and shorten the service life, and only need to install the cast aluminum heater to the use. The outside of the extruder barrel can be. In order to facilitate the cooling and control, the 4~6 heating section outside the barrel is also equipped with a blower. When the temperature exceeds the set value, the blower automatically turns on the blast cooling while turning off the heater. When the temperature is too low, the heater switch is automatically turned on to perform heating while the blower is stopped to maintain a constant temperature. The temperature control mode can be a plurality of types such as a two-position control mode, a time proportional control mode, a continuous proportional control mode, a composite control mode, a PI control mode, or a PID control mode. The choice of control method should be considered according to the accuracy, economy and easy maintenance of maintenance. In general, in order to improve the wear resistance, a cylinder can be used. In the case where the processing corrosion is particularly large and mechanical corrosion resistance is required to be particularly good, an extruder lined with a high-grade alloy steel such as nickel-molybdenum should be used. The extruder screw has a difference between a mutant screw (so-called nylon screw) and a tapered screw (so-called gauge screw). Recently, due to the diversification of extrusion-coated composite resins, there have been many applications for progressive-type screws that can accommodate various resins. The mutant screw cannot meet the above requirements in terms of high processing speed, high processing accuracy, high level of productivity, and variety of resins, and the use of a mutant screw is becoming less and less. For the screw processing LDPE material, it is best to use a specially designed extruder, mainly considering the following points:
The power of the main motor is greatly improved, which is about 2.5 to 3 times of the power of processing ordinary PE. For example, the motor used in the screw extruder of 65m/m is 15-20 kW, and the processing of LLDPE should be about 40-50 kW; the screw speed is fast, The production speed is high. For this reason, the screw should be specially designed to have an efficient mixing effect and can be adapted to process LLDPE screws. For example, a pin and a mixing head are provided in the tapered screw metering section. It is possible to reserve 2 to 3 screws for different raw materials on one extruder, which is convenient for replacing the screw.
The UB screw manufactured by Mitsubishi Heavy Industries Co., Ltd. can be used for processing extrusion of various resins such as PE, PP, EVA, EAA, EMA, Surlyn, TPX, EVAL, nylon, PET, etc. The extrusion is stable and the mixing and dispersibility is good. , no gelation, a good uniform melt, high extrusion efficiency (ratio of extrusion to the necessary motor power), is a good screw, which is a kind of screw in the main groove The auxiliary screw groove smaller than the main screw groove, so that the solid resin particles which are advanced along the barrel wall are heated into the auxiliary screw groove by the liquid resin which is melted by the heat, and the solid and the liquid advance in the two screw grooves respectively to improve the heat efficiency. No bubbles or gels are produced, and the temperature and viscosity distribution of the resin can be uniform. The universal L/D is 28 and the special purpose is up to 33.
T-die must have the following properties: uniform thickness and temperature required for forming; high uniformity in wide resin melt viscosity and shear rate; highly convenient film width adjustment device; good Film edge curling adjustment function (ビ-ド crimping); prevention of neckin function; no melt orientation of the melt, adhesion of foreign matter; no partial stagnation of the melt; thickness adjustment should be high Accuracy and convenience; easy to disassemble and assemble. Generally, in order to make the internal pressure distribution of the T-die uniform, use a branch pipe, a manifold, and
A melt film having a uniform thickness is formed to flow out of the lip.
Author：admin