Operation method of extruder
1, preparation before driving
(1) plastics that are extruded from molding.
The raw materials should be required for drying, and further drying if necessary.
The raw material is sieving apart from the lumps and the mechanical impurities.
(2) inspection equipment, water, electricity, gas system is normal, ensure smooth water, gas path, do not leak, electrical system is normal, heating system, temperature control, all kinds of instrument is reliable;
The machine is running at low speed to observe the operation of the equipment.
Set up the vacuum pump to see if the work is normal;
If the fault is found out in time.
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(3) the installed head and the set cover.
According to the variety and size of the product, choose the machine head specification.
Put the machine head in the following order.
2, drive
(1) after the constant temperature can drive a car, before driving the nose and extruder flange bolts should be tightened again, in order to eliminate the differences in thermal expansion bolt and the nose, the order of the head bolt is diagonal tightened, the strength should be uniform.
When the head flanged nut is pressed, it is required to be all around the same, otherwise it will be run.
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(2) drive, press "prepare to drive" button, then "drive" button, then slowly rotate the screw speed adjustment knob, and the screw speed starts slowly.
And then we're going to pick up a little bit more.
Adjust the parts accordingly so that the whole extrusion operation is in normal condition.
As needed, the double screw extruder is added with a measuring and the same speed.
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(3) the mold is evenly distributed, and it is well molded and is well formed.
Plasticizing degree of judgment by experience, extrusion materials by hand to squeeze fine to a certain extent without burr, fissure, have certain elasticity, show material plasticizing order at this time.
The screw speed, cylinder and head temperature are adjusted to meet the requirement.
(4) in the extrusion process, the process requirements shall be inspected regularly and the procedure records are completed.
Inspect the quality of the products according to the quality inspection standard and find out the problem in time.
3, parking
(1) stop adding material, squeeze out the plastic in the extruder, reveal the screw, turn off the machine and the power supply, and stop heating.
(2) turn off the extruder and the auxiliary power supply, so that the screw and auxiliary machine stop working.
(3) open the head of the machine and remove the head.
Clean the various parts of the perforated plate and head.
During cleaning to prevent damaged surface in the nose, the nose residual material law of steel, the application of sheet steel to clean up, and then use sand paper to stick in the head of plastic grinding, and polishing, coated with oil or silicone oil rust.
(4) screw and barrel cleaning.
Stay parking material after crushed into powder extrusion is complete, the available compressed air from the loading port, vent residual pellet and powder, blow out repeatedly until the barrel inside is no residual material, the screw rotation speed reduction to zero, stop the extruder, shut off the main power and the cold water total valve.
(5) the safety items that should be noted when crowding out are: electrical, heat, mechanical rotation and heavy loading and unloading.
The machine must be equipped with lifting equipment, head and screw, etc., to ensure safe production.
