How to select the right plastic pelletizer?
This is to help the beginner to select the right plastic pelletizer to get better efficiency. Firstly, you need to know, what is a pelletizer? It is a plastic pelletizing granule making machine.
The first step in meeting such challenges begins with equipment selection. The most common classification of pelletizing processes involves two categories,
differentiated by the state of the plastic material at the time it’s cut:
•Melt pelletizing (hot cut): Melt coming from a die that is almost immediately cut into pellets that are conveyed and cooled by liquid or gas;
•Strand pelletizing (cold cut): Melt coming from a die head is converted into strands that are cut into pellets after cooling and solidification.
The material with chracteristics of fragile and not easily to be stranded, then use hot cut. And the material characteristics is sticky and easily to be stranded, then use stranded cold cut.
The machine auto level depends on your own status, if you have enough cheap labour? the labours if is quite familiar with plastic pelletizing process? If they are quite familiar with pelletizing process, then you can use not so high auto level. But exactly, you need to calculate at least in a five year time, compare the capacity and market profit you can get with higher auto level machine configuration and lower level of machine configuration.
Develop a five-year projection of materials and required capacities. Short-term solutions very often prove to be more expensive and less satisfactory after a period of time.
How to choose the plastic pelletizer output capacity? In long time, the lower capacity will cost you more average sallary, power consumption and plant rent., etc, the total cost per metric ton. if your capital allows, select a resonable higher capacity pelletizing machine.
A line utilizing a simple water bath for strand cooling often is the first option for compounding plants. However, the individual layout can vary significantly, due to the demands of throughput, flexibility, and degree of system integration. In strand pelletizing, polymer strands exit the die head and are transported through a water bath and cooled.
Some polymer compounds are quite fragile and break easily. In this way, the plastic pelletizing plant will suggest to use belt conveyor cold cutt. For such materials, the belt-conveyor strand pelletizer is the best answer. A perforated conveyor belt takes the strands from the die and conveys them smoothly to the cutter. Various options of cooling—water spray, misters, compressed-air Venturi dies, air fan, or combinations thereof—allow for a good deal of flexibility.
When the preferred pellet shape is more spherical than cylindrical, the best alternative is an underwater hot-face cutter.
The main components of the system—cutting head with cutting chamber, die plate, and start-up valve, all on a common supporting frame—are one major assembly. All the other system components, such as process-water circuit with bypass, cutting chamber discharge, sight glass, centrifugal dryer, belt filter, water pump, heat exchanger, and transport system can be selected from a comprehensive range of accessories and combined into a job-specific system.
Benefits of this new non-impact pellet-drying solution are:
•Lower production costs due to long lifetime of all parts coming into contact with pellets.
Lower machine configuration in long run will cost you more, because of the shorter life cycle. to pelletizing machine, the main configuration have:
the reducer type, the screw material, the motor, converter, electrical control system, the heating system, the feeding way, if automatic.
•Gentle pellet handling, which ensures high product quality and less dust generation.
•Reduced energy consumption because no additional energy supply is necessary.
OTHER PELLETIZING PROCESSES
Some other pelletizing processes are rather unusual in the compounding field. The easiest and cheapest way of reducing plastics to an appropriate size for further processing might be a simple grinding operation. However, the resulting particle shape and size are extremely inconsistent. Some important product properties will also suffer negative influence: The bulk density will drastically decrease and the free-flow properties of the bulk would be very poor. That’s why such material will only be acceptable for inferior applications and must be marketed at rather low cost.
Air-cooled die-face pelletizing is a process applicable only for non-sticky products, especially PVC. But this material is more commonly compounded in batch mixers with heating and cooling and discharged as dry-blends. Only negligible amounts of PVC compounds are transformed into pellets.
Water-ring pelletizing is also an automatic operation. But it is also suitable only for less sticky materials and finds its main application in polyolefin recycling and in some minor applications in compounding.
INFLUENCE ON PRODUCT PROPERTIES
Choosing the right pelletizing process involves consideration of more than pellet shape and throughput volume. For example, pellet temperature and residual moisture are inversely proportional; that is, the higher the product temperature, the lower the residual moisture. Some compounds, such as many types of TPE, are sticky, especially at elevated temperatures. This effect can be measured by counting the agglomerates—twins and multiples—in a bulk of pellets.
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