By Alicia Import and Export Trade Co., Ltd | 18 December 2024 | 0 Comments
How to choose plastic granulation machines and auxiliary equipment?
How to choose plastic granulation machines and auxiliary equipment?
1. Use a mother-and-child machine and double screw feed
2. The reduction box should be good, the gears inside must be heat treated, and the bearings should be adjustable
3. The gearbox, screw, barrel, machine head and wear parts should be treated with strength, and the service life should be guaranteed to be more than 1 year
4. The main parts should be made of standard materials
5. The reducer and motor should be purchased from professional manufacturers, and the granulator manufacturer should not assemble them by itself
6. There must be a power distribution cabinet
7. The most important thing about the equipment is that the screw and barrel should be of good quality
8. The washing machine must be produced continuously, without stopping to change water, and use a washing pool, otherwise the efficiency is extremely low
9. Heating should be divided into sections, and the heating in sections should be uniform and controllable
10. There should be matching waste plastic washing Machine, using circulating water, no need to discharge sewage
11. High efficiency and power saving
12. The length-to-diameter ratio of the machine cannot exceed 20 (16:1-20:1 is appropriate, that is, the screw length is 16-20 times the screw diameter)
13. The model shall not be less than 100, the larger the model, the higher the output
14. Double exhaust is required
15. The heating power of the granulator flange (die head) is very important and should be designed at 2.5W per square centimeter (cross-sectional area)
auxiliary equipment
1. Crusher
There are many structural forms of plastic product crushers, including shearing crushers suitable for crushing various types of plastic products, impact crushers and compression crushers suitable for crushing brittle plastic products. The most widely used shearing crusher consists of a base, a crushing chamber, a hopper, a screen plate, a transmission mechanism, a rotating knife and a fixed knife.
The working method of the shearing plastic crusher is very simple: the shearing cutter consists of a rotating blade and a fixed blade, and the rotating blade is driven by an electric motor; the waste plastic to be crushed is sent to the crushing chamber from the feeding hopper, shredded by the high-speed rotating cutter, and then flows out of the machine through the porous screen plate.
2. Cleaning machine
The function of the cleaning machine is to turn over, stir and wash the waste plastic in the water tank with a pair of rotating stirring blades to remove the dirt and sand stuck on the plastic; then the plastic fragments are picked out of the water through the lifting device and transported to the dehydration process.
3. Dehydrator
The dehydrator has a simple structure, similar to the structure of a household spin dryer, and the working method is also similar. It mainly uses the centrifugal force of high-speed rotation to remove the water from the broken plastic in the drum.
4. Dryer
The plastic after crushing, cleaning and dehydration still has a certain degree of moisture. The function of the dryer is to send it into the air duct with hot air circulation through the feeding port to evaporate the moisture in the material and dry the plastic to meet the needs of extrusion granulation process.
5. Vent extruder
The function of the vent extruder is to re-mix the crushed, cleaned and dried plastic through the extruder, heat it to a molten state, and then extrude and cut it into pellets.
Since the source of waste plastic products is relatively complex, there are also many types of mixed materials, and there are more volatiles, moisture and other components in the material, so it is more appropriate to use a vent extruder.
The vent extruder mixes and melts the waste plastic, and the material shape is relatively special, so a spiral forced feeding device is used; a filter is added in front of the barrel, and the molten material is extruded through a porous plate and then pelletized. Waste recycling is to cool and shape the extruded strips in a water tank, and then pelletize them.
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