Purui PP Woven Bag Dewatering Granulator

Product Overview

The Purui PP woven bag dewatering granulator is a custom-designed vented granulation machine specifically for plastic materials after dewatering. It can be directly connected to the discharge of a dewatering machine, eliminating the need for an independent drying process and seamlessly integrating the washing line with the granulation workflow, thereby significantly optimizing the production of recycled plastic pellets. The equipment employs a vented single-screw extrusion process, precisely matching multi-material plastic feedstocks such as PE and PP that have been pre-treated by a screw-type dewatering machine to reduce moisture content to below 5%. The finished pellets achieve a moisture content of ≤0.3% and a size uniformity of ≥95%, supporting continuous, stable 7×24-hour operation. This effectively addresses the pain points of traditional granulation processes—high energy consumption, high defect rates, and cumbersome workflows—making it a core piece of equipment for plastic recycling and processing enterprises.

Technical Principle

This granulator operates on a vented single-screw extrusion principle, precisely tailored to plastic materials that have undergone physical dewatering via a pre-stage screw-type dewatering machine, achieving a moisture content of ≤5%. After the material is fed directly into the hopper and enters the barrel, segmented ceramic heating bands provide precise temperature control, while the shear friction generated by the screw ensures uniform melting and plasticization. A vacuum vent located in the middle section of the screw uses a negative pressure of ≥-0.08 MPa to extract residual free water, surface additives, and low-molecular volatile substances from the material, completely replacing the conventional pre-stage hot-air drying process. Following filtration through adjustable multi-stage screens ranging from 80 to 120 mesh to remove fine impurities, the extruded strands undergo water cooling and shaping, followed by high-precision pelletizing, ultimately producing uniform, dense recycled pellets without any additional drying step, enabling efficient direct granulation of wet materials.

Performance Parameters

1. Standard capacity: 100–2000 kg/h
2. Compatible materials: PE, PP, and other multi-material plastics with a moisture content of ≤5% after dewatering
3. Main motor power: 30–355 kW
4. Moisture content of finished pellets: ≤0.3%
5. Pellet size uniformity: ≥95%
6. Filtration precision: adjustable between 80 and 120 mesh
7. Operating mode: supports continuous, stable 7×24-hour operation
8. Screw and barrel material: 38CrMoAlA alloy or bimetallic material, nitrogen-treated
9. Heating method: electric heating or electromagnetic heating
10. Heater material: cast aluminum, cast copper, mica, or ceramic heaters
11. Motor brand: Siemens, ABB, Weg, or leading domestic brands
12. Pelletizing method: die-face pelletizing or strand-cutting pelletizing
13. Bearing brand: NSK, SKF, INA, FAG, or top domestic brands
14. Inverter brand: ABB, FUJI, Delta, or Siemens
15. Delivery time: 70–80 working days
16. Warranty period: 13 months from the bill of lading date
17. Trademark/brand: PURUI
18. Place of origin: NANTONG

Core Advantages

1. Seamless process integration: Directly connects to the discharge of the dewatering machine, eliminating the need for separate drying steps, efficiently linking the washing line with the granulation process, significantly shortening the production cycle and reducing floor space requirements.
2. Deep vacuum dehydration: Utilizing a negative pressure of ≥-0.08 MPa, thoroughly removes residual moisture and volatiles from the material, resulting in bubble-free pellets with excellent appearance; bubble rate controlled within 2%, and defect rate reduced by 80%.
3. Dramatic reduction in energy consumption: Compared to traditional drying-plus-granulation processes, no additional drying equipment or energy costs are required, cutting electricity expenses per ton of pellets by 25–30 yuan and saving over 100,000 yuan annually in drying energy costs per production line.
4. Stable, low-maintenance operation: With a mature single-screw design, the equipment features low failure rates and minimal maintenance requirements, supporting continuous, stable 7×24-hour operation and ensuring consistent production output.
5. Broad material compatibility: Adaptable to various types of dewatered materials, including films, woven bags, PET bottle flakes, rigid plastic fragments, non-woven fabrics, and more, meeting diverse needs across different plastic recycling and processing scenarios.

Core Value of the Product

1. Eliminates the need for separate hot-air drying, dramatically reducing production energy consumption and equipment investment costs; electricity expenses per ton of pellets drop by 25–30 yuan, with annual energy savings exceeding 100,000 yuan.
2. Vacuum venting technology ensures bubble-free finished pellets, reduces defect rates by 80%, enhancing the quality and market competitiveness of recycled pellets.
3. Shortens the production cycle by 30%, increases per-unit-time productivity by 25%, reduces factory floor space by 20%, and optimizes production layout.
4. Enables continuous, stable 7×24-hour operation; the single-screw structure boasts low failure rates, minimizing maintenance costs and risks of production interruptions.

Target Customer Groups

Plastic washing and granulation integrated plants, small and medium-sized recycled pellet factories, plastic recycling processors, renewable resource treatment enterprises, packaging film/woven bag manufacturers, and other businesses involved in plastic recycling and processing—all can customize suitable granulation equipment according to their specific production needs.

Application Scenarios

This equipment is primarily used for direct granulation of dewatered PE/PP films, woven bags, PET bottle flakes, rigid plastic fragments, and non-woven fabrics after washing. It can also be integrated into a complete washing–dewatering–granulation production line, enabling continuous, highly efficient production of recycled plastic pellets, particularly suited for plastic recycling scenarios where streamlining production processes and reducing energy costs are priorities.

Solving Industry Pain Points

1. Addresses the issue of requiring extra drying for wet materials after washing, which increases equipment investment and energy costs: eliminates the need for drying, removing the requirement to purchase and operate drying equipment, reducing per-ton processing costs by 25–30 yuan and saving over 100,000 yuan annually in energy expenses.
2. Tackles the problem of bubbles, broken strands, hollow pellets, and high defect rates when directly granulating moist materials: using a negative pressure of ≥-0.08 MPa for deep vacuum dehydration, keeps bubble rates below 2% and cuts defect rates by 80%, improving pellet quality.
3. Resolves the issue of lengthy production cycles and increased floor space, labor, and maintenance costs caused by drying processes: shortens the production cycle by 30%, reduces factory floor space by 20%, and lowers labor and equipment maintenance costs.
4. Overcomes the limitation of ordinary granulators being unable to handle dewatered materials with moisture levels above 5%, ensuring stable production: precisely adapts to dewatered materials with moisture content ≤5%, featuring a mature, stable single-screw structure that supports continuous 7×24-hour operation, guaranteeing steady production output.

Frequently Asked Questions (FAQ)

Q1: Does this granulator need to be used in conjunction with a drying unit?
A: No, this equipment is specifically designed for plastic materials with moisture content ≤5% after dewatering. Through the vacuum vent in the middle section of the screw, residual moisture is deeply removed, eliminating the need for pre-stage hot-air drying; direct granulation is possible.
Q2: What is the equipment’s capacity range? Can it be customized?
A: The standard capacity ranges from 100 to 2000 kg/h. This product is custom-made, allowing customers to specify models tailored to their production needs.
Q3: Which types of plastic materials does the equipment support?
A: It accommodates various materials—including PE/PP films, woven bags, PET bottle flakes, rigid plastic fragments, and non-woven fabrics—that have been dewatered to a moisture content of ≤5%.
Q4: How long is the warranty period?
A: The warranty lasts 13 months from the date of the bill of lading, during which relevant after-sales services are available.
Q5: Compared to traditional granulation processes, how much cost can this equipment save?
A: Compared to the drying-plus-granulation approach, electricity costs per ton of pellets drop by 25–30 yuan, and each production line saves over 100,000 yuan annually in drying energy costs. Additionally, defect rates decrease by 80%, reducing losses due to defective products.