Single–Double Screw Combination Recycling Pelletizer

Product Overview

The single–double screw combination recycling pelletizer is a customized machine specifically designed for the recycling and modification of waste plastics. It employs a two-step granulation process featuring a first-stage single-screw extruder followed by a second-stage twin-screw extruder, combining the high-efficiency coarse melting and impurity removal advantages of the single-screw with the deep mixing and modification capabilities of the twin-screw. This design perfectly balances recycling efficiency with high-end modification quality, while reducing procurement costs by approximately 35% compared to all-twin-screw equipment, offering outstanding cost-effectiveness. The standard production capacity ranges from 100 to 2,000 kg/h, making it suitable for various general-purpose plastic recycling and modification needs. Core components can be selected from top international brands such as Siemens, ABB, and NSK, ensuring stable operation with low failure rates, thus providing recycled-plastic enterprises with an efficient, flexible, and high-quality pelletizing solution.

Technical Principle

This equipment utilizes a two-step process—first-stage single-screw extrusion combined with second-stage twin-screw mixing—to achieve complete transformation of waste plastics from recycled materials into high-quality modified pellets. In the first stage, the single-screw extruder performs preliminary melting and coarse filtration to remove impurities, converting irregular solid waste into uniform molten material. This step not only effectively eliminates large particulate contaminants but also reduces the processing load on the second-stage twin-screw unit, laying the groundwork for subsequent advanced treatment. The molten material is then fed directly into the second-stage co-rotating parallel twin-screw extruder, where intense shear and intermeshing actions facilitate thorough blending, vacuum degassing, and functional modification. Various additives can be incorporated online to tailor material properties, ultimately producing high-quality modified recycled pellets with performance uniformity ≥95% and impurity content ≤0.8% via a high-precision pelletizing system, fully meeting the production requirements of mid-to-high-end plastic products.

Key Performance Parameters

1. Standard production capacity: 100–2,000 kg/h
2. Finished pellet performance uniformity: ≥95%
3. Finished pellet impurity content: ≤0.8%
4. Total motor power: 45–355 kW
5. Screw and barrel material: 38CrMoAlA alloy or bimetallic material, nitrided
6. Heating method: electric heating or electromagnetic heating
7. Heater material: cast aluminum, cast copper, mica heaters, ceramic heaters
8. Motor brand: Siemens, ABB, Weg, or leading domestic brands
9. Pelletizing method: die-face pelletizing or strand-cutting pelletizing
10. Bearing brand: NSK, SKF, INA, FAG, or top domestic brands
11. Inverter brand: ABB, FUJI, Delta, Siemens
12. Delivery period: 70–80 working days
13. Warranty period: 13 months from the bill of lading date

Core Competitive Advantages

1. Two-step process advantage: Combines the high recycling efficiency of the single-screw with the superior modification effects of the twin-screw, enabling rapid processing of large volumes of general-purpose recycled materials while producing modified pellets that meet high-end requirements—delivering dual productivity value in one machine.
2. High cost-effectiveness: Compared to all-twin-screw equipment, procurement costs are reduced by about 35%, significantly lowering initial investment while maintaining modification quality, thereby shortening the return-on-investment cycle.
3. High production flexibility: Easily switches between general-purpose recycling and modified-material production modes, covering broader market demands and avoiding idle capacity on a single production line, thus improving equipment utilization.
4. Protection of core components: The coarse impurity removal function of the first-stage single-screw effectively filters hard contaminants from the feedstock, reducing wear on the second-stage twin-screw and extending the service life of key components, thereby lowering long-term maintenance costs.
5. Stable and reliable configuration: Core components can be sourced from top international brands, ensuring robust operational stability and low failure rates, supporting 24-hour continuous production with daily pellet output up to 48 tons, guaranteeing enterprise productivity.

Core Product Value

1. Cost-control advantage: Saves 35% on procurement costs compared to all-twin-screw equipment, shortens the return-on-investment cycle by 30%, significantly easing financial pressure on enterprises and boosting return on investment.
2. Market-expansion capability: Simultaneously serves both the general-recycling and high-end-modification markets, meeting diverse customer needs, increasing product gross margins by 25% and enhancing corporate profitability.
3. Extended equipment lifespan: The coarse filtration process in the first stage reduces wear on the second-stage screws by 40%, significantly prolonging the service life of core components and minimizing downtime for maintenance and replacement parts.
4. Guaranteed production efficiency: Supports 24-hour continuous and stable operation, with daily pellet output reaching up to 48 tons, maximizing production capacity while ensuring finished-product quality.

Target Customer Groups

This equipment is specially designed for mid-to-high-end recycled-plastic enterprises, factories engaged in both general recycling and modification, small and medium-sized modified-plastic plants, and comprehensive resource-utilization companies. It meets these businesses’ multifaceted needs in terms of recycling efficiency, modification quality, cost control, and production flexibility, helping them enhance market competitiveness and profitability.

Typical Application Scenarios

1. Integrated production of thin films, woven bags, and rigid materials recycling plus modification: Handles various types of general-purpose waste plastics, completing the entire process from recycling and impurity removal to modified pelletizing, yielding high-quality recycled pellets.
2. Functional modification and pelletizing of general-purpose plastics: Incorporates various functional additives online to upgrade the performance of general-purpose plastics, producing modified pellets tailored to specific industry requirements.
3. High-end recycling and modification of PET bottle flakes: Performs deep processing and modification of PET bottle flake waste, producing recycled PET pellets that meet food-grade and packaging-grade high standards.
4. Multi-functional recycled-pellet manufacturing: Flexibly switches production modes to produce recycled pellets with different properties and grades, satisfying small-batch, multi-category market orders.
5. Small- and medium-scale multi-category modified-material production: Addresses the production characteristics of small and medium-sized modified-plastic plants, enabling efficient production of multiple categories of modified materials while reducing changeover costs and time.

Solutions to Industry Pain Points

1. Addressing the issue of insufficient quality in pure single-screw equipment: Pure single-screw machines can only perform basic recycling and pelletizing without achieving deep modification; this equipment’s second-stage twin-screw system enables thorough material blending and performance upgrading, meeting the demands of high-end modified materials.
2. Solving the problems of high cost and low efficiency associated with all-twin-screw equipment: All-twin-screw units have high procurement costs and relatively low efficiency when processing waste plastics; this equipment uses the first-stage single-screw’s efficient pre-processing to boost overall recycling efficiency, while reducing procurement costs by 35%, striking a balance between cost and efficiency.
3. Resolving the problem of idle capacity on a single production line: Traditional single-line operations can only produce either general-purpose or modified materials, leaving capacity underutilized during market demand fluctuations; this equipment allows flexible switching between production modes, covering more market demands and improving equipment utilization.
4. Alleviating the burden of investing in multiple pieces of equipment: Configuring both single-screw and twin-screw units requires substantial capital investment and has a long return-on-investment cycle; this equipment integrates both functions into a single production line, dramatically reducing initial outlays and shortening the payback period.

Frequently Asked Questions (FAQ)

Q1: Does this single–double screw combination recycling pelletizer support customization?
A: Yes, this equipment is custom-made with no fixed price; it will be tailored according to the customer’s production volume requirements to ensure full alignment between equipment capacity and production needs.
Q2: Which brands can be chosen for core components?
A: Core components can be sourced from top international brands. Motors may be selected from Siemens, ABB, or Weg; bearings from NSK, SKF, INA, or FAG; inverters from ABB, FUJI, Delta, or Siemens. Domestic top-tier brands are also available upon request.
Q3: What is the warranty period for the equipment?
A: The warranty lasts 13 months from the date of the bill of lading. During the warranty period, we provide free repair services and replacement parts to ensure stable operation.
Q4: What types of plastic waste can the equipment handle?
A: The equipment is compatible with various general-purpose plastic recycling and modification needs, including thin films, woven bags, rigid materials, PET bottle flakes, and other types of waste plastics.
Q5: Compared to all-twin-screw equipment, what are the advantages of this equipment’s return-on-investment cycle?
A: Compared to all-twin-screw equipment, this device saves 35% on procurement costs and shortens the return-on-investment cycle by 30%. At the same time, it covers both general-recycling and high-end-modification markets, increasing product gross margins by 25% and enabling enterprises to generate revenue more quickly.