Single-Double Screw Combination Modified Pelletizing Machine

Product Overview

The single-double screw combination modified pelletizing machine is a customized equipment specially designed for plastic recycling and modification production. It adopts a two-step pelletizing line structure combining a single screw and a double screw: the first-stage single screw efficiently completes coarse melting and impurity removal, while the second-stage double screw achieves deep mixing and modification, perfectly balancing recycling efficiency with high-end modification quality and offering outstanding cost-effectiveness. The standard capacity of the equipment ranges from 100 to 2000 kg/h, with finished pellet performance uniformity ≥95% and impurity content ≤0.8%. It can adapt to various general-purpose plastic recycling and modification needs, and can be custom-made according to customers’ production requirements, making it an ideal production device for mid-to-high-end recycled plastics enterprises as well as factories that handle both general recycling and modification production.

Technical Principle

This equipment employs a two-step process of “first-stage single-screw extrusion + second-stage double-screw mixing” to achieve integrated plastic recycling and modification production. The first-stage single screw is responsible for the preliminary melting and coarse filtration of waste plastics, transforming solid waste into uniform molten material—both completing initial waste treatment and effectively reducing the processing load on the second-stage equipment, thereby protecting core components. The molten material is directly fed into the second-stage co-rotating parallel double screw, where strong shear and intermeshing perform deep blending, vacuum degassing, and functional modification. Various additives can be added online to upgrade material properties, ultimately producing high-quality modified recycled pellets with uniform performance through a high-precision pelletizing system. This two-step design retains the high efficiency of the single screw in handling recycled materials while leveraging the excellent deep-modification capabilities of the double screw, enabling the equipment to simultaneously meet both general recycling and high-end modification demands.

Performance Parameters

1. Standard capacity: 100–2000 kg/h
2. Finished pellet performance uniformity: ≥95%
3. Impurity content: ≤0.8%
4. Total motor power: 45–355 kW
5. Applicable range: various general-purpose plastic recycling and modification needs
6. Screw and barrel material: 38CrMoAlA, bimetallic, nitrided treatment
7. Heating method: electric heating, electromagnetic heating
8. Heater material: cast aluminum, cast copper, mica, ceramic heaters
9. Motor brand: Siemens, ABB, Weg, or leading domestic brands
10. Pelletizing method: die-face pelletizing, strand-cutting pelletizing
11. Bearing brand: NSK, SKF, INA, FAG, or top domestic brands
12. Inverter brand: ABB, FUJI, Delta, Siemens
13. Delivery time: 70–80 working days
14. Warranty period: 13 months from the bill of lading date
15. Brand/trademark: PURUI
16. Place of origin: NANTONG

Core Advantages

1. Two-step process balances efficiency and quality: By adopting a combined design of first-stage single screw plus second-stage double screw, it delivers both the high recycling efficiency of the single screw and the superior modification effects of the double screw, meeting the dual needs of general plastic recycling and high-end modified material production—all within one machine.
2. High cost-effectiveness reduces procurement costs: Compared to pure double-screw equipment, procurement costs are reduced by approximately 35%, significantly lowering capital investment while ensuring modification quality, thus easing financial pressure on enterprises.
3. Flexible production covers a broader market: It can seamlessly switch between general recycling and modified material production modes, handling conventional recyclables such as films, woven bags, and rigid plastics, while also producing high-end modified PET bottle flakes and functionalized modified pellets, covering wider market demands and avoiding idle capacity.
4. Protection of core components extends service life: The coarse impurity removal process of the first-stage single screw effectively filters out contaminants before they enter the second-stage double screw, reducing wear on core parts; wear on the second-stage screws is reduced by 40%, greatly extending the lifespan of core components and lowering maintenance costs.
5. High-end configuration ensures stable operation: Core components can be optionally equipped with international top-tier brands such as Siemens, ABB, NSK, or SKF, ensuring stable operation, low failure rates, and 24-hour continuous production, with daily pellet output reaching up to 48 tons, thereby boosting production efficiency.

Core Value of the Product

1. Significant cost advantage: Compared to pure double-screw equipment, procurement costs are reduced by 35%, shortening the return-on-investment period by 30% and enabling rapid profitability.
2. Comprehensive market coverage: Simultaneously serving both the general recycling and high-end modification markets, capable of producing multiple categories of recycled pellets, increasing product gross margins by 25% and expanding enterprise profit margins.
3. Extended equipment lifespan: The first-stage coarse filtration effectively protects the second-stage core components, reducing screw wear by 40% and cutting maintenance costs and downtime, thereby improving overall equipment utilization.
4. Excellent production efficiency: Supports 24-hour continuous production, with daily pellet output up to 48 tons, balancing recycling efficiency with modification quality to meet large-scale production demands.

Target Customer Groups

Mid-to-high-end recycled plastics enterprises, factories that handle both general recycling and modification production, small and medium-sized modified plastics plants, and comprehensive resource utilization companies—these businesses not only need to process large volumes of conventional recycled plastics but also seek to produce high-end modified materials to expand their market reach. The multifunctional features of this equipment perfectly match their production needs.

Application Scenarios

This equipment is suitable for various plastic recycling and modification production scenarios, including integrated recycling and modification of films, woven bags, and rigid plastics; functionalized modification granulation of general-purpose plastics; high-end recycling and modification of PET bottle flakes; manufacturing of multi-functional recycled pellets; and small-to-medium batch production of various modified materials. Whether handling conventional recyclables or custom-producing high-end modified pellets, its two-step process ensures stable completion, meeting diverse production requirements.

Solutions to Industry Pain Points

1. Addresses the pain point of insufficient quality in pure single-screw equipment: Pure single-screw machines can only perform simple recycling and pelletizing, unable to achieve deep mixing and modification or produce high-end modified materials. This equipment’s second-stage double screw enables deep blending and functional modification, satisfying high-end material production needs.
2. Solves the pain points of high cost and low efficiency in pure double-screw equipment: Pure double-screw equipment has high procurement costs and suffers from low efficiency when processing impure recycled materials, with rapid component wear. This equipment’s first-stage single screw efficiently handles coarse processing, reducing the load on the second-stage double screw, while its procurement cost is 35% lower than that of pure double-screw equipment, balancing cost and efficiency.
3. Resolves the issue of single-line functionality: Traditional single lines can only produce either general recycled materials or modified materials, lacking flexibility and resulting in high idle capacity. This equipment allows quick switching between production modes, covering two production needs with one machine and improving capacity utilization.
4. Alleviates the financial burden of investing in multiple pieces of equipment: Purchasing separate recycling and modification equipment requires substantial funds and results in long return-on-investment periods. This equipment’s integrated design saves on the cost of acquiring separate units, shortening the return-on-investment period by 30% and easing financial pressure on enterprises.

Frequently Asked Questions (FAQ)

Q1: Can this single-double screw combination modified pelletizing machine be customized?
A: Yes, this equipment is a custom product with no fixed price. It can be tailored according to customers’ production volume requirements, matching the needs of enterprises of different scales.
Q2: How long is the warranty period?
A: The warranty period is 13 months from the date of the bill of lading. During the warranty period, if non-human-caused quality issues arise, corresponding repair services will be provided.
Q3: Which plastic raw materials can this equipment process?
A: The equipment can handle various general-purpose plastic recycling and modification needs, including films, woven bags, rigid plastics, PET bottle flakes, and other types of waste plastic raw materials.
Q4: What are the advantages of this equipment compared to pure double-screw equipment?
A: Compared to pure double-screw equipment, this equipment reduces procurement costs by about 35%, while retaining the high efficiency of the single screw in processing recycled materials. It can simultaneously address both general recycling and high-end modification production, shortening the return-on-investment period by 30% and reducing core component wear by 40%, thus extending service life.
Q5: What is the delivery time?
A: The delivery time is 70–80 working days, which may be adjusted based on the complexity of customization requirements.