Single–Double Screw Combination Granulator for Rigid Materials

Product Overview

The single–double screw combination granulator is a two-step granulation line that integrates a single-screw stage with a twin-screw stage. It is specifically designed for plastic recycling and modification, balancing high recycling efficiency with premium modification quality, offering outstanding cost-effectiveness. The first-stage single screw efficiently performs preliminary melting and impurity removal, while the second-stage twin screws achieve deep mixing and modification. This equipment can accommodate various general-purpose plastic recycling and modification needs, with standard capacities ranging from 100 to 2,000 kg/h. Finished pellets exhibit a uniformity of ≥95% and impurity levels ≤0.8%, making it an ideal production solution for mid- to high-end recycled plastics companies as well as factories that handle both general recycling and modification processes.

Technical Principle

This granulator employs a two-step process—“first-stage single-screw extrusion plus second-stage twin-screw mixing”—to simultaneously achieve efficient recycling and superior modification. The first-stage single screw handles initial melting and coarse filtration to remove impurities, transforming solid waste into a uniform molten stream. Not only does this provide preliminary waste treatment, but it also significantly reduces the processing load on the second-stage equipment, thereby minimizing wear on key components. The molten material is then fed directly into the second-stage co-rotating parallel twin screws, where intense shearing and intermeshing enable thorough blending, vacuum degassing, and functional modification. Various additives can be incorporated inline to enhance material properties, ultimately producing high-quality modified recycled pellets with consistent performance via a high-precision pelletizing system, meeting diverse application requirements.

Performance Parameters

1. Standard capacity: 100–2,000 kg/h
2. Uniformity of finished pellet properties: ≥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 materials: 38CrMoAlA alloy or bimetallic materials, nitrogen-treated
7. Heating methods: Electric heating, electromagnetic heating
8. Heater materials: Cast aluminum, cast copper, mica heaters, ceramic heaters
9. Motor brands: Siemens, ABB, Weg, or leading domestic brands
10. Pelletizing methods: Die-face pelletizing, strand-cutting pelletizing
11. Bearing brands: NSK, SKF, INA, FAG, or top domestic brands
12. Inverter brands: ABB, FUJI, Delta, Siemens
13. Delivery period: 70–80 working days
14. Warranty period: 13 months from the bill of lading date
15. Brand: PURUI
16. Country of origin: NANTONG

Core Advantages

1. Two-step process advantages: Combines the high recycling efficiency of the single screw with the excellent modification capabilities of the twin screws, enabling rapid processing of large volumes of recycled plastics while producing high-quality modified pellets to meet diverse production demands.
2. High cost-effectiveness: Compared to pure twin-screw equipment, procurement costs are reduced by approximately 35%, significantly lowering capital expenditure while maintaining product quality, thus saving enterprises substantial funds.
3. Strong production flexibility: Easily switch between general recycling and modification production, expanding market coverage, reducing idle capacity, and improving equipment utilization.
4. Protection of core components: The preliminary impurity removal stage effectively filters out contaminants, safeguarding the second-stage twin screws, reducing screw wear, extending the service life of critical parts, and lowering maintenance costs.
5. Stable and reliable configuration: Core components can be selected from internationally renowned brands, ensuring stable operation, low failure rates, continuous production, and minimized downtime for repairs.

Core Value of the Product

1. Optimization of costs and returns: Compared to pure twin-screw equipment, procurement costs are reduced by 35%, the investment payback period is shortened by 30%, and the product covers both general recycling and high-end modification markets, boosting gross margins by 25% and helping enterprises quickly recoup costs while increasing profitability.
2. Extended equipment lifespan: After preliminary filtration in the first stage, wear on the second-stage screws is reduced by 40%, prolonging the service life of core components, cutting replacement and repair expenses, and lowering long-term operating costs.
3. Efficient production output: With 24-hour operation, daily pellet production can reach up to 48 tons, balancing efficiency and quality to meet large-scale production demands and enhance the company’s market supply capacity.
4. Expanded market coverage: Flexible switching between different types of pellets allows coverage of general recycling, high-end modification, and other scenarios, helping enterprises broaden their customer base and strengthen market competitiveness.

Target Customer Groups

Mid- to high-end recycled plastics companies, factories engaged in both general recycling and modification, small and medium-sized modified plastics plants, and comprehensive resource utilization enterprises—all these businesses need to handle large quantities of recycled plastics while producing high-quality modified pellets. The characteristics of this equipment perfectly align with their specific production needs.

Application Scenarios

This equipment is suitable for a wide range of plastic production scenarios, including integrated recycling and modification of films, woven bags, and rigid materials; converting common waste plastics into high-quality recycled pellets; functional modification of general-purpose plastics through additive incorporation to upgrade material properties; high-end PET bottle flake recycling and modification to enhance performance for premium applications; manufacturing multi-functional recycled pellets tailored to various downstream products; and small-to-medium batch production of multiple types of modified materials, allowing flexible switching among different product lines to meet diverse order requirements.

Solving Industry Pain Points

1. Addressing the quality limitations of pure single-screw equipment: Pure single-screw systems cannot produce high-end modified materials, whereas the second-stage twin screws in this combined granulator enable deep mixing and modification, producing pellets that meet premium demands and filling the performance gap left by single-screw machines.
2. Improving cost and efficiency issues of pure twin-screw equipment: While twin-screw machines have high procurement costs and lower efficiency in handling recycled materials, this equipment’s two-step design retains the modification capability of twin screws while leveraging the single screw’s efficient processing to boost recycling efficiency and reduce procurement expenses.
3. Resolving idle capacity problems on single production lines: Single-line operations often struggle to balance general-purpose and modified materials, resulting in high idle rates. This equipment offers flexible production mode switching, allowing operators to adjust production types according to order requirements, fully utilizing available capacity and enhancing overall productivity.
4. Alleviating financial pressure from investing in multiple pieces of equipment: Investing in numerous separate units imposes heavy financial burdens and lengthy payback periods. By integrating recycling and modification functions into one machine, this equipment consolidates the work of several devices, reducing capital outlays and shortening the investment return cycle.

Common Questions FAQ

Q1: What types of plastics can this single–double screw combination granulator process?
A: The equipment is compatible with various general-purpose plastic recycling and modification needs, including films, woven bags, rigid materials, PET bottle flakes, and many other types of waste plastics, offering broad applicability.
Q2: What is the equipment’s capacity range?
A: The standard capacity ranges from 100 to 2,000 kg/h, with configurations customizable to suit specific production requirements. Under 24-hour operation, daily pellet output can reach up to 48 tons.
Q3: How does this equipment compare to pure twin-screw models in terms of cost-effectiveness?
A: Compared to pure twin-screw machines, this equipment reduces procurement costs by approximately 35% while shortening the investment payback period by 30%. It also supports both general recycling and high-end modification, boosting product gross margins, delivering clear advantages in both cost and revenue.
Q4: What is the warranty period for the equipment’s core components?
A: The warranty lasts 13 months from the bill of lading date. Core components can be selected from internationally renowned brands such as Siemens, ABB, NSK, SKF, or domestic top-tier brands, catering to diverse enterprise configuration needs.