Single-Double Screw Combination Granulator for Woven Bags

Product Overview

The single-double screw combination granulator for woven bags is a customized machine designed specifically for recycled plastic recovery and modification. It adopts a two-step granulation line structure featuring a first-stage single screw plus a second-stage twin screw, retaining the efficient recycling and impurity removal capabilities of the single screw while also offering the deep mixing and modification advantages of the twin screw. This design balances high-efficiency waste plastic recovery with premium modified product quality, delivering outstanding cost-effectiveness. The equipment’s standard capacity ranges from 100 to 2000 kg/h, with finished pellet uniformity ≥95% and impurity content ≤0.8%. It can accommodate various general-purpose plastic recycling and modification needs, supports online addition of diverse additives to upgrade material properties, and provides integrated recycling and modification solutions for recycled plastics enterprises.

Technical Principle

This equipment employs a two-step process—first-stage single-screw extrusion followed by second-stage twin-screw compounding—to efficiently transform waste plastics from recovered scraps into high-quality modified pellets. The first-stage single screw handles initial melting and coarse filtration to remove impurities, converting solid materials like woven bags into a uniform melt, thereby reducing the processing load on the second-stage twin-screw unit while pre-filtering most contaminants to protect core components. The molten material is then fed directly into the second-stage co-rotating parallel twin screws, where intense shearing and intermeshing achieve thorough blending, vacuum degassing, and functional modification. Depending on production requirements, various additives can be added online to tailor material properties, ultimately yielding uniformly performing, high-quality recycled modified pellets through a high-precision pelletizing system that meets diverse application needs.

Performance Parameters

1. Standard capacity: 100–2000 kg/h
2. Finished pellet uniformity: ≥95%
3. Impurity content: ≤0.8%
4. Total motor power: 45–355 kW
5. Compatible materials: Various general-purpose plastics
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-cut pelletizing
11. Bearing brands: NSK, SKF, INA, FAG, or top domestic brands
12. Inverter brands: ABB, FUJI, Delta, Siemens
13. Delivery time: 70–80 working days
14. Warranty period: 13 months from bill of lading date
15. Trademark/Brand: PURUI
16. Place of origin: NANTONG

Core Advantages

1. Two-step process balances efficiency and quality: Combining the high recycling efficiency of the single screw with the superior modification effects of the twin screw, this machine quickly processes recycled materials such as used woven bags while producing modified pellets meeting high-end demands, addressing the limitations of single-equipment operation.
2. Cost-effective solution reduces procurement expenses: Compared to pure twin-screw systems, purchase costs are reduced by approximately 35%, significantly lowering initial capital outlay while maintaining modification quality and boosting return on investment.
3. Flexible production covers multiple product categories: Easily switch between general recycling and modified-material production modes, broadening market coverage and avoiding idle capacity on a single production line, thus improving equipment utilization.
4. Protected core components extend service life: The first-stage single screw’s preliminary impurity removal effectively filters out most contaminants, safeguarding the second-stage twin-screw’s core parts, reducing screw wear by 40% and prolonging equipment lifespan, thereby cutting down on later maintenance costs.
5. High-end configuration ensures stable operation: Key components can be selected from world-class brands; motors, bearings, inverters, and other parts boast reliable quality, ensuring stable performance, low failure rates, and support for 24-hour continuous production, with daily output reaching up to 48 tons of pellets.

Core Value of the Product

1. Balancing cost and performance: Compared to pure twin-screw systems, procurement costs are reduced by 35%, shortening the payback period by 30% without compromising modification capacity, helping companies save money while accelerating capital recovery.
2. Expanding market reach: Simultaneously serving both general recycling and high-end modification markets, enabling production of multiple types of recycled pellets, enriching product portfolios and increasing gross margins by 25%.
3. Extending equipment lifespan: Preliminary filtration in the first stage effectively reduces wear on the second-stage screws, prolonging core component life, lowering subsequent maintenance costs and downtime losses.
4. Efficient, stable production: Supports 24-hour continuous operation, with daily output up to 48 tons of pellets, balancing production efficiency and product quality to meet large-scale manufacturing demands.

Target Customer Groups

This equipment primarily targets mid-to-high-end recycled plastics enterprises, factories engaged in both general recycling and modification, small and medium-sized modified-plastic plants, and comprehensive resource utilization businesses. These companies need to handle substantial volumes of waste plastic while also seeking to expand their market through high-end modified pellets. The equipment’s two-step design and flexible production mode perfectly align with their operational needs.

Application Scenarios

1. Integrated recycling and modification of films, woven bags, and rigid plastics: For used woven bags, plastic films, rigid plastics, and similar materials, this machine enables seamless processing—from waste collection and impurity removal to modified pellet production—yielding high-quality recycled pellets.
2. Functional modification of general-purpose plastics: For PP, PE, and other common plastics, online additive incorporation achieves functional modifications, producing pellets with special properties such as anti-aging, enhanced toughness, or flame retardancy.
3. High-end PET bottle flake recycling and modification: Processing recycled PET bottle flakes through deep blending and modification to enhance the performance of recycled materials, meeting the demands of high-end packaging applications.
4. Multi-functional recycled pellet production: Flexibly switch between producing different types of recycled pellets according to market demand, covering everything from general recycling materials to high-end modified products.
5. Small-batch, multi-category modified-material production: Supports switching between small batches of various modified materials, satisfying enterprises’ needs for multiple small orders and speeding up market responsiveness.

Solutions to Industry Pain Points

1. Addressing insufficient quality of pure single-screw machines: Pure single-screw equipment can only perform basic recycling and granulation, unable to achieve deep mixing and modification or produce high-end modified materials. The second-stage twin screw in this machine delivers advanced modification, meeting premium market requirements.
2. Solving the issues of high cost and low efficiency associated with pure twin-screw systems: Pure twin-screw machines have high procurement costs and suffer from low efficiency due to excessive impurities during waste processing. This equipment uses a first-stage single screw for efficient impurity removal, boosting recycling efficiency while reducing procurement costs by 35%, easing financial pressure.
3. Tackling idle capacity on single production lines: Single-line operations often face underutilization when market demand fluctuates. This equipment allows flexible switching between production modes, covering multiple product categories and enhancing equipment utilization.
4. Alleviating the financial burden of investing in multiple pieces of equipment: Purchasing separate recycling and modification machines entails significant upfront costs and long payback periods. This integrated design replaces several devices, reducing initial investment and shortening the return-on-investment timeline.

Frequently Asked Questions (FAQ)

Q1: Does this single-double screw combination granulator support customization?
A: Yes, this equipment is custom-made with no fixed price; it is tailored to each customer’s production volume requirements, accommodating the needs of businesses of varying scales.
Q2: What is the equipment’s capacity range? What is its maximum daily output?
A: The standard capacity ranges from 100 to 2000 kg/h, supporting 24-hour continuous operation, with a maximum daily output of 48 tons of pellets, suitable for production needs across different scales.
Q3: How long 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 world-class brands, ensuring stable operation and low failure rates, while the first-stage preliminary impurity removal effectively extends the lifespan of core parts.
Q4: Can the equipment process plastic waste other than woven bags?
A: Yes, it accommodates various general-purpose plastic recycling and modification needs, including films, rigid plastics, PET bottle flakes, and more, handling both recycling and modification tasks.
Q5: Compared to pure twin-screw systems, where does this equipment’s cost-effectiveness lie?
A: Compared to pure twin-screw machines, this equipment reduces procurement costs by about 35%, shortens the payback period by 30%, and still delivers the modification capabilities of twin screws while combining the efficient recycling ability of a single screw. It covers both general recycling and high-end modification markets, boosting product gross margins.