Sorting Different Types Of Plastics

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Sorting Different Types Of Plastics, plastics recycling, and waste reuse have attracted much attention. Plastic recycling machines have become a key technology for turning waste into treasure, utilizing advanced technology to transform waste plastics into reusable raw materials, creating a sustainable plastics circular economy. This article explores the critical technologies of plastics recycling machines to help readers understand how to effectively utilize these machines to achieve the reuse of waste plastics.

Sorting Different Types Of Plastics

 

Plastic Recycling Machine Sieving Technology: Sorting Different Types of Plastics

Sorting technology plays a vital role in plastics recycling machines, separating different types of plastics for subsequent processing. The sorting process utilizes the differences in physical properties between plastic kinds, such as density, size, and shape, to separate mixed plastic waste into different categories. This technology is critical to improving recycling efficiency and ensuring the quality and value of recycled materials.

Types of Sifters

  • Rotary Sieve: utilizes air flow to separate light plastics from heavy plastics.
  • Vibrating Sieve: Separates plastic particles of different sizes by mechanical vibration.
  • Hydrocyclone: Using the centrifugal water flow force to separate plastics with different densities.
  • Optical sorters: Use laser or spectral analysis technology to detect and separate different types of plastics.

Sorting Process

  • Pre-treatment: Roughly categorize the plastic waste and remove large foreign matter.
  • Primary sieving: Use a rotary or vibrating sieve to separate plastic particles according to size.
  • Fine screening: Using hydrocyclones or optical sorters to separate further different types of plastics, such as polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC).
  • Quality control: Manual or automatic inspection to confirm the purity and quality of the sorted plastics.

Plastic recycling machine sorting technology is critical to creating a more sustainable plastic waste management system. It allows us to convert plastic waste into valuable resources while minimizing environmental impact. We can efficiently sort and recycle different plastics through advanced sorting technology, contributing to the circular economy.

 

Plastic Recycling Machine’s Crushing Technology: Breaking Down Plastic Waste into Smaller Pieces

Crushing technology plays a vital role in plastics recycling by converting waste plastics into smaller pieces suitable for further processing. There are many different types of plastic crushers with different functions and applications. The following is a list of critical technologies of plastic crushers:

Blade types:

  1. Flat blades: Suitable for softer plastics such as film and bags.
  2. Curved blades: For more rigid plastics, such as bottles and buckets.
  3. Dual-axis blades: Two rotary blades operate in opposite directions to provide the finer crushing effect.

Rotation speed and torque

  1. Rotation speed and torque determine the crushing capacity of a plastic crusher.
  2. Higher speed and torque are suitable for more rigid plastics, while lower speed and torque are suitable for softer plastics.

Cooling System

  1. Heat is generated when crushing plastics, which may soften or melt the plastic and affect the crushing effect.
  2. A cooling system, such as water or air cooling, can help reduce the temperature and ensure optimum crushing performance.

Noise control

  1. The plastic crusher will generate noise during operation, which may impact the environment.
  2. Shredders with noise control devices can reduce noise levels and comply with environmental regulations.

Safe Design

  1. Plastic shredders involve high-speed rotating blades, so safety design is critical.
  2. Safety devices, such as safety barriers and emergency stop buttons, can prevent injuries during operation.

Proper selection of plastic crusher technology is critical to effectively recycling plastic waste. Using the right technology, such as blades, speed, and cooling system, will ensure optimum performance and efficiency of the plastic crusher.

 

Water washing technology for plastic recycling machines: removing impurities from plastic wastes

Plastic wastes inevitably contain a variety of impurities, such as soil, paper, metals, and organic matter, during the recycling process. To ensure the quality of recycled plastics, washing technology is essential to effectively remove these impurities and increase the purity and reuse value of the plastics.

Principle of water washing

  1. Plastic waste is immersed in a pool or sink, allowing the water flow to carry away the attached impurities.
  2. The strength and duration of the water flow are adjusted according to the type of plastic waste and the degree of contamination.
  3. The impurities, which have a relatively light specific gravity, float on the water’s surface and are collected and removed by the filtration system.

Water washing equipment

  1. Flotation Tank: Utilizing the buoyancy of the water flow, the impurities with lower specific gravity will be floated to the water’s surface.
  2. Spiral Washer: Utilizes spiral blades to agitate the water flow to promote the removal and floating of impurities.
  3. Centrifugal Dewaterer: Separate water and impurities by centrifugal force to improve the dryness of plastic waste.

Washing Process

  1. Plastic waste is fed into the washing system, soaked, and agitated to dissolve and strip off impurities.
  2. The impurities float to the water’s surface and are discharged through an overflow or collected using a filter.
  3. The washed plastic waste is dried in a centrifugal dryer to remove water and prepare it for subsequent crushing and pelletizing.

Washing Benefits

  1. Removes impurities from the plastic waste and improves the quality of the recycled plastic.
  2. Reduces wear and tear in the subsequent recycling process and extends the life of the equipment.
  3. Comply with environmental protection regulations and prevent impurities from entering the environment.

Water washing technology for plastic recycling machines: removing impurities from plastic wastes

Principle of water washingWashing equipmentWash processWashing benefits
Plastic waste is immersed in water, and the flow carries away the attached impurities.Flotation TankWe are utilizing the buoyancy of the current to float impurities to the water’s surface.Soak and agitate plastic waste to dissolve and strip away impurities.After floating to the water’s surface, the impurities are discharged through an overflow or collected through a filter.Removes impurities from plastic waste and improves the quality of recycled plastics.

Reduces wear and tear in the subsequent recycling process and extends equipment life.

Conforms to environmental regulations and prevents impurities from entering the environment.

The strength and duration of the water flow are adjusted according to the type of plastic waste and the degree of contamination.Spiral WasherWe use the spiral blades to stir the water flow to promote impurities’ detachment and floating.
Impurities are lightweight and float on the surface of the water.Centrifugal DehydratorsSeparate water and impurities by centrifugal force to improve the dryness of plastic waste.The washed plastic waste is dried in a centrifugal dryer to remove water.

 

Plastic Recycling Machine Pelletizing Technology: Converting Recycled Materials into Reusable Granules

Pelletizing is critical in plastics recycling, converting washed plastic debris into reusable pellets. Pelletizing technology in plastic recycling machines involves the following key steps:

  1. Putting the cleaned plastic chips into the pelletizer.
  2. heating the plastic chips to melt them into liquid plastic
  3. extruding the melted plastic through a mold to form small strips
  4. The plastic strips are cooled and cut into pellets.

The choice of pelletizing technology depends on the type of plastic to be processed and the required pellet size. Standard pelletizing techniques include:

  1. Underwater pelletizing: Underwater pelletizing extrudes melted plastic into the water to form small pellets. The pellets cool quickly to create dense, smooth pellets.
  2. Hot Air Pelletizing: Hot air pelletizing extrudes melted plastic into hot air to form pellets. The airflow cools the pellets to create rough, porous pellets.
  3. Air Circulation Pelletizing: Air Ring Cut Pelletizing extrudes melted plastic into an air ring, which generates a high-velocity air stream that cools the pellets. This technique produces uniform, spherical pellets.

By choosing the right pelletizing technology, plastic recycling machines can produce high-quality plastic pellets that can be used to make a wide range of new plastic products, thus enabling the sustainable reuse of plastic waste.

 

Drying Technology for Plastic Recycling Machines: Removing Moisture from Plastic Wastes

Water is one of the main impurities that need to be removed during the plastics recycling process as it affects the quality and reuse value of the recycled material. The following types of drying technology are mainly used in plastic recycling machines:

  1. Hot air drying: Hot air evaporates water from the plastic waste and is discharged through the ventilation system. Hot air drying is highly efficient but requires higher energy consumption.
  2. Microwave drying: using microwave energy to make the plastic waste’s water molecules rapidly vibrate, generating heat and evaporation of water. Microwave drying speed, but the equipment cost is higher.
  3. Vacuum drying: Plastic waste is placed in a vacuum environment to reduce the surrounding pressure so that water’s boiling point reduces and accelerates evaporation. Vacuum drying consumes less energy, but the drying time is longer.

In practice, the most suitable drying technology is usually selected according to the type of plastic waste, moisture content, and drying requirements. For example, hot air drying is ideal for plastic wastes with low moisture content, while microwave drying is suitable for materials with high moisture content that require fast drying.

In addition, parameters such as drying temperature, air flow rate, and drying time must be optimized for the specific situation to achieve the best drying results. The drying technology of plastic recycling machines is the most essential part of plastic recycling. By removing the water, the quality of the recycled material can be improved, making it more suitable for subsequent reuse, thus promoting the recycling of plastic waste and realizing the sustainable reuse of plastic waste.

 

Conclusion

Using plastic recycling machines, we can help reduce plastic waste in the environment by converting discarded plastics into valuable resources. These advanced machines utilize sophisticated technologies such as sieving, crushing, washing, and pelletizing to break plastic waste into reusable raw materials. Using these key technologies, plastic recycling machines play a vital role in creating a more sustainable and energy-efficient society.

 

FAQ

What types of plastics can be processed in a plastic recycling machine?

  • Plastic recyclers can process various plastics, including PET, PE, PP, PVC, and PS. These plastics commonly make bottles, containers, films, and other products.

How do plastic recyclers sort and classify plastics?

  • Plastic recyclers use advanced technologies such as optical sorters and metal detectors to sort and separate different types of plastics. These devices can recognize the type of plastic and sort it into groups to be further processed.

How does the pelletizing technology of a plastics recycling machine work?

  • Pelletizing in a plastics recycling machine is the process of converting washed plastic debris into homogeneous pellets. These pellets can be sold to manufacturers to make new plastic products such as bottles, containers, and automotive parts.
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