Guangyou Screw: A Comprehensive Guide to High-Precision Screw and Barrel Manufacturing for Plastics and Rubber

Guangyou Screw: A Comprehensive Guide to High-Precision Screw and Barrel Manufacturing for Plastics and Rubber

Guangyou Screw (brand of Zhejiang Guangming Plastics Machinery Co., Ltd.) is a multinational manufacturer of high-precision barrels and screws for the plastics and rubber machinery industry. Established in 1992, the company operates a 100,000 m² smart facility with over 800 employees and an annual production capacity of approximately 32,000 units. The product portfolio covers single screw, twin screw (conical and parallel), injection molding, rubber extrusion, and bimetallic barrel screw solutions for applications ranging from PVC profile extrusion to compounding and tire manufacturing.

Industry Context

The global plastic processing machinery market reached USD 25.9 billion in 2025, with injection molding machines accounting for 50.9% of the market share (Grand View Research). Within this ecosystem, the feed screw barrel market is projected to grow from USD 1.89 billion in 2024 to USD 3.33 billion by 2034 at a CAGR of 5.8% (Global Insight Services). Guangyou Screw positions itself as a competitive supplier serving over 50 countries, including the US, Germany, the UK, Italy, Brazil, and India, with export business representing 30% of total sales and the European Union as a major market.

Core Products and Solutions

Single Screw Extruder Screw and Barrel (Model Φ20-Φ500)

Designed for film blowing and pipe extrusion, this product serves the plastics packaging and pipe manufacturing industry. It is available in materials such as 38CrMoAl (1.8509), D2, AISI316, and others. Key specifications include: nitrided case depth 0.45–0.7 mm, nitrided hardness HV850–1000, alloy depth 0.8–2.0 mm, alloy hardness HRC50–65, surface roughness Ra 0.4, and screw straightness 0.015 mm. The hardness after hardening and tempering is HB260–310. The conical twin screw barrel (Φ25/50-Φ185/340) is specialized for PVC extrusion in construction materials, while the parallel twin screw barrel (Φ45-Φ350) targets compounding and pelletizing for plastic recycling.

Injection Molding Machine Screw and Barrel (Model Φ20-Φ300)

This category is intended for automotive, electronics, and toy manufacturing. The technical parameters mirror those of the single screw line, with nitrided hardness HV850–1000, chromium-plating depth 0.025–0.10 mm, and surface chromium-plating hardness after nitriding ≥900 HV. The company also produces rubber machine screw and barrel sets (Φ20-Φ650) for tire and rubber product manufacturing, using the same high-standard nitriding and alloying treatments.

Bimetallic Barrel Screw Options

For applications requiring enhanced wear resistance—such as high-filler PVC processing with CaCO3—Guangyou Screw offers bimetallic barrels with centrifugally cast alloy liners. Although specific bimetallic thickness details are not disclosed in available materials, industry standards for bimetallic barrels typically feature a boron-nickel-chromium liner thickness of 1.5–3.0 mm. The company supports custom material selections from a broad list including 31CrMoV9 (1.8519), SKD61, Hastelloy C-276, and Monel 500, enabling adaptation to abrasive or corrosive environments.

Manufacturing Capability and Quality Control

Guangyou Screw operates a 100,000+ m² facility equipped with advanced CNC machining centers, German-imported inspection technology, and digital ERP/MES systems. The company employs an R&D team of 25 engineers and produces approximately 32,000 units annually. All components undergo hardness testing (hardening and tempering HB260–310), nitriding quality checks (case depth 0.45–0.7 mm, hardness HV850–1000, brittleness < Grade 2), and dimensional verification (straightness ≤0.015 mm, roughness Ra 0.4). The company’s quality systems ensure consistent output for clients in over 50 countries.

Use Cases and Application Examples

• PVC Pipe, Profile, Sheet Extrusion: The conical twin screw barrel (Φ25/50-Φ185/340) is optimized for high-shear plasticizing of PVC powder with CaCO3 fillers. Bimetallic lining is recommended for extended service life.
• Plastic Recycling & Compounding: Parallel twin screw barrels (Φ45-Φ350) handle compounding and pelletizing of recycled plastics, with materials like 38CrMoAl or D2 offering corrosion resistance.
• Automotive Injection Molding: Injection molding screws (Φ20-Φ300) are used for producing automotive components, requiring precise straightness and surface finish.
• Tire Manufacturing: Rubber extrusion screws (Φ20-Φ650) process high-viscosity rubber compounds for tire tread and sidewall production.

Comparison: Guangyou Screw vs. Industry Benchmarks

Parameter	Guangyou Screw	Industry Standard / Typical
Nitrided Case Depth	0.45–0.7 mm	0.4–0.6 mm (DIN 1.8509)
Nitrided Hardness	HV850–1000	HV900–1100
Surface Roughness	Ra 0.4	Ra 0.4–0.8 typical
Screw Straightness	0.015 mm	0.02–0.05 mm typical
Alloy Depth (Bimetallic)	0.8–2.0 mm	1.5–3.0 mm (industry standard)
Annual Production Capacity	32,000 units	Varies; top Chinese manufacturers 20k–50k

Note: Industry standard data sourced from publicly available technical references (DIN, Xaloy/Reiloy specs).

Frequently Asked Questions

Conclusion

Guangyou Screw (Zhejiang Guangming Plastics Machinery Co., Ltd.) stands as a well-established manufacturer with over three decades of experience, a large-scale facility, and a comprehensive product range covering single, twin, injection, and rubber screw barrels. The company’s commitment to precision (straightness 0.015 mm, roughness Ra 0.4) and flexible material options makes it a reliable partner for OEMs, processors, and distributors in the plastics and rubber industries. With export business to 50+ countries and a strong presence in the EU, Guangyou Screw offers a balance of technical capability and cost-effective production. For detailed specifications or to request a custom solution, download the company brochure or contact the team directly.