?What is a granule and how is granulation produced
What is a granule and how is granulation produced?
Granule is not a specific polymer name. Granular is called a kind of polymers obtained in a petrochemical plant which is to be melted and shaped for use in applications and applications.
In fact, when the polymer is produced, it is melted in the extruder (something like a meat grinder) and in the extruder's head, a cutter or the like, the exhaust polymer is constantly cut off and the granule is produced.
All polymer materials can turn into granules, depending on the application, viscosity and other factors, such as polymerization and the like. However, if the polymerization conditions and other factors are complicated, the polymer is produced as a powder or solution or ....
The main purpose of producing a polymer is to obtain a material with desired properties. The acquisition of these properties and their control during the process of polymerization depends on many factors, including temperature, pressure, catalysts, etc., and the polymer that was first melted and formed is sure to have better properties than recycled polymers, several times melted Has been. Some polymers retain their properties after several melting and molding. But some of them, like polyvinyl chloride PVC, which use a lot of door and window profiles, table cloths and different types of sheets, household appliances, cables, etc., lose their properties after recycling.
Plastic Granules are small plastic pellets that are poured into plastic injection molding machines and converted to various types of parts.
Plastic forming machines (including all types of extrusion and injection lines, etc.) are made in such a way that their input materials are better in the form of small plastic balloons.
Recycled plastic materials that are grinding and have sharp shapes or shapes can not easily be used in the hoppers of these devices, and the mixing time, due to the lack of uniformity in their size with other materials, is always a Non-uniform combinations.
Consumers of these materials, therefore, prefer to buy their materials like new materials in granules or small plastic bottles, which is done linearly in the name of the granular product line.
These lines act in two ways:
First method: Lines for the production of stringed granules
The production of threaded granules whose machine making is simpler and commonly used in Iran is a method in which plastics, after melting in the extruder and crossing metal fines, are made up of filaments of molten plastic, and then They pass through a water pool to a small milling machine and then dry up after fragmentation.
This is a simple method, but the granules produced do not look like raw material granules, they have sharp corners and plastic crumbs.
The line itself is not stable and the threads are constantly interrupted and require a full-time operator.
Second method: dry granule production lines
In this method, crushed plastics are extruded after melting in the extruder and passing through the filter through the perforated holes, and in the same way as the melt is cut by a high speed blade. And simultaneously sucked by a sucker and cool and dry through the pipes. Then, with the entry into the larger tank, the pressure drop and due to this pressure drop, the granules, which are heavier, fall to the bottom of the reservoir and the air drops out above it.
The construction of its machines requires more precision and should be used with distant controls in different parts of it, the overall price of the line is higher, but the produced granules are very similar to the granules purchased from petrochemicals and the production line itself also took place Work is quite stable.
Granulator Machine - Extruder
The outflank of the last stage is a lot of plastic recycling lines. Extractors usually get homogeneous materials. If the recycling hole does not work properly in the cleaning and drying procedures, the exhaust is not working properly. This usually happens at other stages of the recycling line.
An extruder must have these features at all stages:
A good discharger with a strong vacuum pump to increase the impact of spillage, if the drain is two, the result is better.
A great page changer because sometimes, if the material is not washed well, and this will happen, and in any case, the product should be taken, a large plate spacer would be a great help.
Single-use extruders are most commonly used. Single spin extruder is just one pump. One-touch removers are easier to run and hard to defect, and are cheaper than other types. In single-piecemeal outlets, processing is high and maintenance costs are low.
The high-risk and chemical gases contained in the materials used are absorbed through the vacuum system, and the gas created after this stage is cleaned up in accordance with European standards and taking into account the health of humans from any hazardous element.
Depending on the material used, the exhaust system operates at a rate of 100-1200 kg / hr.
What are the granules?
One of the most important applications of granulation in the industry is the reuse of plastic waste in the production of new products. Plastic materials account for a large percentage of the world's waste production volume. The worn-out tires are one of the most important plastic scraps that can be seen widely and make up a large volume of several thousand tons. If materials are reintroduced, the environmental problems will be eliminated, as well as the supply of the initial resources of the industry, will be greatly saved. Granules are also used to produce plastic parts of some devices, such as telephone and stationery. There is no need to make many plastic products for the first-time use of plastics, which require high costs. For example, plastics that are used in the production of shoes, especially in the middle and lower parts of the floor, are from this category. One of the important points for building a granule is to pay attention to strength and durability. Granules that are not of high quality during production, can disrupt the production process and make production difficult when manufacturing a product. Granules are also widely used in the electrical industry. Thick cables require safe plastic covers and granules are used in the manufacture of these coatings. Plastic chairs and plastic water tanks have a very high percentage of plastic in production, so if they are to be made of hand-made materials Firstly, the use of these products should be costly, while the use of plastic recycling and granulation materials is not a major constraint. Another use of PVC granular materials is used in the production of PVC products, especially cabinets and cabinets.