Temperature setting of graphite ore extruder

1.

The temperature of the extruder head is set according to the use requirements

The specific setting of each process temperature index of

extrusion is as follows:

feeding section: 185 ℃, which is determined according to the shear performance and extrusion volume of extruder to ensure the display temperature & gt; 180℃

compression section: 180 ℃; Melting section: 180 ℃:

metering section: 170 ℃ ~ 180 ℃, according to the shear performance and extrusion volume of extruder, ensure the display temperature ≤ 185 ℃. If necessary, screw temperature and feeding speed can be adjusted respectively

die temperature: 185 ℃; die temperature: 190 ℃ ~ 200 ℃; adjust according to the profile section forming and wall thickness

extended data

die and die are usually integrated, which is commonly referred to as die; But there are also cases where the head and die are separated. The function of the die head is to change the plastic melt in the rotary motion into parallel linear motion, so that the plastic can be further plasticized evenly, and the melt can be evenly and smoothly introced into the die, and the necessary molding pressure can be given to make the plastic easy to shape and the resulting procts dense

the die is a channel with a certain cross-section shape. When the plastic melt flows in the die, it gets the required shape and is cooled and hardened by the setting device and cooling system outside the die. The components of head and die include filter screen, multi hole wrench, diverter (sometimes it is combined with die core to form a component), die core, die and neck

The porous plate in the die can make the die and barrel align and position, support the filter screen (filtering the non melting impurities in the melt) and proce back pressure on the melt. There are also correction and adjustment devices (set screws) in the head, which can adjust and correct the concentricity, size and shape of the die core and die. In the proction of pipes or blown films, compressed air can be introced through the neck and die core

According to the angle between the direction of material flow and the center line of screw, the die can be divided into right angle die (also known as T-type die) and angle die (right angle or other angles). The right angle die is mainly used for extruding pipe, sheet and other profiles, while the angle die is mainly used for extruding film, cable cladding and blow molding procts

2. The extruder is divided into several temperature zones according to different models. Generally, it is divided into barrel temperature zone, head temperature zone and barrel temperature zone according to different stages. Most of them adopt automatic temperature control instruments. When the temperature is lower than the set value, the electric heating coil will be automatically cut off when it reaches the set value. After the shearing heat is overheated, air cooling or water cooling will be adopted
the screw extruder relies on the pressure and shear force generated by the screw rotation, which can make the materials fully plasticized and evenly mixed, forming through the die. Plastic extruder is also one of the types of plastic machinery. According to the direction of material flow and the angle of screw center line, the extruder head can be divided into right angle head and oblique angle head. The shell of the machine head is generally fixed on the fuselage with bolts. The die inside the machine head contains a die core seat, which is then fixed on the wire inlet port of the machine head with nuts. The inner part of the die core seat is also equipped with a die core, and there are holes in the center of the die core and the die core seat, which are used to pass through the core wire. According to the different types of pressure, the extrusion process can be divided into continuous extrusion and intermittent extrusion. The former is screw extruder, the latter is plunger extruder. The screw extruder can be classified into single screw extruder and multi screw extruder according to the number of screws.

3. Degradation temperature and complete plasticization temperature of the material

4. How many ranges of extruder temperature are higher than the set temperature
extruders are divided into several temperature zones according to different models, generally including barrel temperature zone, head temperature zone, and barrel temperature zone according to different stages. Most of them adopt automatic temperature control instruments. When the temperature is lower than the set value, the electric heating coil will automatically cut off when it reaches the set value. Because the shearing heat is overheated, air cooling or water cooling will be adopted.

5. Isn't there a multi-point embedded resistor? Instrument control temperature and water valve
now use electromagnetic heating, replace the resistance wire

6. 1. Technical parameters of single screw extruder screw diameter DB: refers to major diameter, series standard 20, 30, 45, 65, 90, 120, 150, 165, 200, 250 300 screw length diameter ratio L / DB: screw working part length and screw diameter ratio screw speed range: Nmin nmax R / min drive screw motor power P: kW extruder proction capacity Q: plastic volume per hour specific flow per hour per revolution extruder proction capacity nominal specific power per hour motor power required to process kg plastic 2 Model sl-150 means that the screw diameter is 150 mm and the length diameter ratio is 20:1 for plastic extrusion
edit the extrusion process parameters of this section
1. The extrusion temperature includes barrel temperature, plastic temperature and screw temperature. Generally, we measure the barrel temperature. The temperature is controlled by the heating and cooling system. Because of the screw structure, the instability of the heating and cooling system, the screw speed changes and other reasons, the extrusion material temperature fluctuates in the radial and axial direction, which affects the proct quality. The strength of each point of the proct is not the same, resulting in resial stress, and the surface is dark and lusterless. In order to ensure the quality of procts, the temperature should be stable. 2. Pressure e to the screw and barrel structure, the resistance of the head, filter screen and filter plate, there is pressure in the plastic. The pressure changes as shown in the figure, and the pressure also fluctuates. 3. Extrusion rate the mass or length of plastic extruded from the die of an extruder per unit time. The influencing factors of extrusion rate are head resistance, screw and barrel structure, screw speed, heating, cooling system and plastic properties. But when the proct is fixed, the extrusion rate is only related to the screw speed. The extrusion rate also fluctuates, which affects the proct geometry and size. In order to ensure the proct quality, the screw should be designed correctly, the heating and cooling system and the screw speed stability should be well controlled to rece the parameter fluctuation.

7. You have a little temperature here, right? The temperature measuring point is very important, and there are thermocouples. The temperature difference between domestic and imported procts is very large. You can try yamari thermocouple here. May be able to help you solve such problems, and there are professional Japanese technicians to help you solve the problem

8. Use the mold warming machine

9. The maximum plasticizing temperature of the new material should not exceed 260 ℃, and the recycled material should be adjusted according to the flat film condition, which is generally about 200 ℃. There is no difference between the three zones and the five zones. The melting point of PP is about 168-175 ℃