Introduction
Zhejiang Bohai Machinery Co., Ltd. is a Chinese manufacturer of screw and barrel systems for plastics processing equipment, with a particular emphasis on twin-screw, conical twin-screw, parallel twin-screw, single-screw, and bimetallic screw-barrel assemblies used in extrusion and injection molding applications. The company is based in Jintang Town, Dinghai District, Zhoushan City, Zhejiang Province, in an area described by company and marketplace listings as one of China’s major screw-and-barrel production clusters.
Founded in 2004, the company presents itself as a specialized industrial supplier serving the plastics machinery value chain, combining in-house manufacturing with technical personnel and process inspection capabilities. Its products are positioned for use in downstream plastics processes such as profile extrusion, pipe, sheet, granulation, blow film, recycling, and injection molding, indicating a focus on wear-resistant, process-specific components rather than complete processing machines.
History and Development
Zhejiang Bohai Machinery was founded in 2004 in Zhoushan, Zhejiang, a region widely associated with screw and barrel manufacturing in China. Over time, the company appears to have grown from a regional supplier into an exporter and exhibition participant serving both domestic and overseas customers.
Public company material highlights several concrete development markers:
- 2004: Company establishment in Zhoushan, Zhejiang.
- 2018–2021: Reported revenue increased from ¥58 million in 2018 to ¥92 million in 2021, suggesting expansion during that period.
- 2021: The firm was listed among Zhejiang’s science and technology-oriented small and medium-sized enterprises in a provincial notice, which supports its positioning as a technical manufacturing business.
The company also appears in exhibition-related industry listings, including CHINAPLAS-related exhibitor information, indicating active participation in plastics-industry trade promotion and customer outreach.
Business Operations and Segments
Zhejiang Bohai Machinery’s business is centered on the manufacture of screw barrels and related components for plastics processing machinery. The company’s catalog, as reflected in marketplace listings, includes:
- Twin screw and barrel systems
- Conical twin screw and barrel systems
- Parallel twin screw and barrel systems
- Single screw and barrel systems
- Bimetallic screw and barrel products
- Screw barrels for extrusion lines
- Injection machine screw barrels
The firm describes itself as a manufacturer and supplier rather than a processor of plastics, placing it upstream of end-product plastics production and closer to the machinery supply chain. This makes its business sensitive to capital expenditure cycles in extrusion and injection molding equipment, as well as to replacement demand for worn components.
Products and Technologies
The company’s core products are mechanical components that determine the melting, conveying, mixing, and pressurization behavior of polymer during processing. In practical terms, screw-and-barrel design affects throughput, temperature control, material residence time, and wear resistance.
Key product types
| Product type | Typical role |
|---|---|
| Single-screw barrel | Common in general-purpose extrusion and injection applications |
| Conical twin-screw barrel | Often used in PVC and profile extrusion, where feeding and plasticization behavior are important |
| Parallel twin-screw barrel | Used where mixing, compounding, and stable output are required |
| Bimetallic screw/barrel | Designed for improved wear and corrosion resistance in demanding formulations |
| Extrusion-line screw barrel | Used in continuous processing lines for pipe, sheet, and profile production |
| Injection-machine screw barrel | Used in plasticizing units for injection molding machines |
Company and marketplace descriptions indicate use of 38CrMoAlA steel and bimetallic materials, reflecting industry-standard approaches to balancing base strength with surface hardness and wear resistance. The company also states that it uses testing equipment from Europe and the United States to support product accuracy and quality control.
Applications and End Markets
Available source material suggests that Zhejiang Bohai Machinery serves a broad set of plastics-processing applications rather than a single niche. Its product descriptions explicitly mention suitability for:
- PVC profile extrusion
- Pipe production
- Sheet production
- Granulation and compounding
- Blow film
- Plastic recycling
These applications imply demand from processors that require stable melt quality, durable surfaces, and component geometry matched to specific resins and output requirements. The presence of recycling applications is notable because recycled feedstocks can increase abrasion and contamination-related wear, making bimetallic and hardened screw-barrel systems more relevant.
Global Presence and Market Position
The company is located in Zhoushan, a manufacturing hub widely identified in its own and third-party listings as a major Chinese base for screw and barrel production. That location gives it access to a clustered supply chain for machining, materials, and plastics machinery customers.
Trade-directory and marketplace references indicate that the company operates as an exporter, manufacturer, and supplier, with visibility on international B2B platforms and exhibition portals. While no reliable source in the provided material states a verified global market share, the listings suggest a small-to-medium specialized manufacturer with export-oriented sales channels rather than a vertically integrated multinational plastics-machinery group.
Sustainability and Environmental Initiatives
No source in the provided material describes a formal sustainability program, emissions target, or circular-economy roadmap for the company. However, one of its cited application areas is plastic recycling, which places its products within a segment increasingly associated with circular plastics processing.
As with many machinery-component suppliers, the environmental impact of the company’s products is indirect: improved screw and barrel durability can reduce replacement frequency, while optimized processing equipment can lower scrap and energy losses in customer operations. These are reasonable industry inferences, but they are not stated explicitly in the provided company sources.
Financial Performance and Economic Impact
The company’s official website reports revenue of ¥58 million in 2018, ¥54 million in 2019, ¥79 million in 2020, and ¥92 million in 2021. This pattern indicates a recovery and growth trajectory after the 2019 dip, although no audited financial statements were included in the provided sources.
Its economic role is concentrated in the machinery supply chain: the company manufactures industrial components used by plastics processors, supporting domestic equipment maintenance, line expansion, and replacement demand. It also contributes to the broader Zhoushan industrial cluster, which is part of China’s established plastics-equipment manufacturing ecosystem.
Leadership and Corporate Governance
The provided sources do not include a full board or executive roster. Available third-party marketplace material identifies the business as a manufacturer/factory with ISO 9001 certification and a company sales contact, suggesting a conventional privately held industrial structure rather than a publicly listed governance framework.
One LinkedIn profile associated with the company describes a sales professional working on conical twin-screw barrel products and states experience in the role since 2013. This supports the interpretation that the company maintains a specialized sales and technical-commercial function, though the profile should be treated as supplementary rather than definitive corporate governance evidence.
Innovations and Future Outlook
The company’s reported focus on bimetallic wear-resistant components, specialized twin-screw designs, and process-specific barrel configurations indicates a product strategy aligned with current plastics-industry requirements for longer service life, better corrosion resistance, and application-specific performance.
Future demand for firms like Zhejiang Bohai Machinery is likely to be shaped by several industry dynamics:
- Continued replacement and refurbishment of aging extrusion and injection equipment
- Growth in PVC profiles, pipes, and building materials in emerging and domestic markets
- Higher wear demands from recycled resin and mixed-feed processing
- Customer preference for process-specific screw geometries that improve output consistency and energy efficiency
The company’s participation in CHINAPLAS-related exhibitor activity suggests that it continues to use major industry exhibitions to reach processors and equipment builders, which is typical for specialized machinery-component suppliers seeking export and OEM opportunities.
References
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CPS+ eMarketplace. (n.d.). ZHEJIANG BOHAI MACHINERY CO., LTD.ZHEJIANG BOHAI MACHINERY CO., LTD.. CPS+ eMarketplace. https://www.chinaplasonline.com/eMarketplace/ExhibitorInfo?CompId=1013113Link