Introduction
ZHOUSHAN DEMAJI INDUSTRIAL CO., LTD. (舟山德玛吉实业有限公司) is a Chinese manufacturer specializing in screws and barrels for plastics processing machinery, with a particular focus on extrusion and injection molding equipment. Based in Zhoushan, Zhejiang Province, the company supplies parts to domestic plastics machinery producers and exports to markets including India, Japan, South Korea, Indonesia, Russia, the Middle East, Africa, and Taiwan. Its product profile places it in the plastics machinery component segment, where screw-barrel design, metallurgy, wear resistance, and corrosion resistance are critical to processing performance and service life.
The company presents itself as a large-scale producer with in-house manufacturing and trade functions, and its product range includes conical twin screws and barrels, parallel twin screws and barrels, and single-screw injection/extrusion barrels. Available business listings indicate that the firm was established in 2006 and is headquartered in Zhoushan’s Jintang industrial area, a location associated with China’s plastics machinery supply chain. Publicly available exhibitor and supplier directories also describe the company as serving more than 100 domestic plastics machinery manufacturers, underscoring its role as a component supplier rather than a finished-machine brand.
History and Development
Zhoushan Demaji Industrial Co., Ltd. was founded in 2006, according to business and company-profile databases. Its development has been shaped by the growth of China’s plastics-processing equipment industry, especially the demand for durable replacement parts and customized screw-barrel assemblies for extrusion and injection applications.
A second milestone is the company’s continued expansion into export markets, with trade and exhibitor references showing shipments and commercial visibility in South and Southeast Asia, the Middle East, Europe, and other regions. This suggests that the company evolved from a domestic processing supplier into a broader international component exporter.
A third development is the firm’s emphasis on material engineering and wear-resistant product lines. Company descriptions mention cooperation with Swedish research engineers and the development of highly wear-resistant, corrosion-resistant screws, including branded series aimed at demanding PVC and filled-compound applications. These claims indicate a focus on technical differentiation in a segment where operating conditions can be severe and product lifetime is commercially important.
Business Operations and Segments
The company is described as both a manufacturer and a supplier, with in-house production and foreign-trade functions. Public listings identify its core business as the manufacture of special equipment parts for plastic processing, especially screw-barrel assemblies and related spare parts.
Its operating model appears to combine:
- Standard product manufacturing for common machine categories
- Custom processing based on customer samples and specifications
- Export-oriented sales, supported by an internal international trade function
This structure is typical of component manufacturers in the plastics machinery ecosystem, where fit, metallurgy, and process compatibility often require application-specific adaptation rather than mass-standardized output.
Products and Technologies
The company’s main products are screws, barrels, and related plastic-machine parts. Public product listings and supplier pages indicate coverage across several screw-barrel categories:
- Conical twin-screw barrels
- Parallel twin-screw barrels
- Single-screw barrels for injection and extrusion
- Injection molding screw-barrel assemblies
- Spare parts for plastic machinery
Technical descriptions published on the company’s product pages and marketplace listings point to the use of materials such as 38CrMoAlA, SKD61, and SACM645, along with nitriding and other surface treatments. For plastic machinery components, these are important because they influence wear resistance, corrosion resistance, and the ability to process aggressive formulations such as PVC, high-filler compounds, and wood-plastic composites.
The company also claims to have developed specialized product series for high-corrosion and high-wear operating conditions, including long-life screw designs intended for demanding extrusion markets. In practical terms, such products are relevant to processors handling:
- PVC pipe and profile
- Sheet and board
- Wood-plastic composites
- Recycled materials
- Filled and abrasive formulations
Applications and End Markets
Zhoushan Demaji’s products are used in plastics processing machinery, rather than in consumer end products directly. The company’s stated market focus includes extrusion and molding lines used for:
- PVC and WPC profiles
- Pipe and tube production
- Sheet and panel extrusion
- SPC-related applications
- Injection molding machinery
These applications are consistent with the needs of plastics processors that require stable plasticizing performance, consistent throughput, and long service intervals. Screw and barrel quality is especially important in sectors that process abrasive or corrosive materials, where premature wear can increase downtime and operating cost.
Global Presence and Market Position
Public sources indicate that the company has a meaningful footprint in both the domestic Chinese market and international trade channels. It is described as supplying more than 100 large Chinese plastics machinery manufacturers and exporting to multiple overseas markets.
Trade-data platforms also show recorded cross-border shipments associated with the company, supporting the view that it participates in the international aftermarket and component trade for plastics machinery. While those databases do not establish global market share, they do indicate that the company is active beyond a purely local or regional customer base.
In industry-directory listings, the company is positioned as a specialized supplier of plastic-machine components, with particular visibility in screw-barrel categories used by extrusion and injection equipment makers.
Sustainability and Environmental Initiatives
No comprehensive sustainability report was identified in the available sources. However, the company’s product positioning in long-wear and high-durability screw-barrel systems may have indirect operational benefits by extending service life and reducing replacement frequency. In plastics machinery, longer component life can reduce material consumption and downtime, although the environmental effect depends on product design, process efficiency, and end-user operating practices.
The company also states a quality-management orientation and references ISO 9001 certification in supplier and company listings. While quality certification is not itself an environmental program, it is relevant to manufacturing control, scrap reduction, and product consistency.
Financial Performance and Economic Impact
The available sources do not provide audited revenue, profit, or asset data. Public listings do indicate that the company operates a sizable manufacturing base and employs approximately 300 people in one supplier profile, suggesting material local economic activity in Zhoushan’s industrial cluster.
Its economic impact is concentrated in:
- Industrial employment in Zhejiang Province
- Supply-chain support for plastics machinery makers
- Export earnings through overseas sales of machinery components
As a component supplier, its business model is tied to capital spending in plastics processing equipment, aftermarket replacement demand, and the modernization of extrusion and injection lines.
Leadership and Corporate Governance
Publicly available corporate references identify Xu En as the company’s legal representative in one business-profile source. Other supplier and marketplace listings identify sales contacts and trade personnel, but do not provide a complete governance structure or board composition.
The company’s commercial organization appears to include a dedicated international sales function, which is consistent with its export-oriented profile. No detailed governance disclosures were found in the available sources.
Innovations and Future Outlook
The company’s main innovation theme is materials and surface engineering for screw-barrel durability. Its published product descriptions emphasize nitriding, wear-resistant alloys, and custom designs for corrosive or abrasive polymer formulations, which are central technical differentiators in the plastics machinery component market.
Future competitiveness for firms in this segment will likely depend on:
- Improved wear and corrosion resistance
- Better performance in recycled and filled polymers
- Greater process stability and component life
- Expansion of export channels and distributor networks
- Continued adaptation to higher-efficiency extrusion and molding platforms
Company and exhibitor listings suggest that Demaji has already sought broader international exposure through trade platforms and exhibitions, including European exhibitor directories. That pattern indicates an ongoing effort to expand beyond its domestic base and compete in higher-value component markets.
Summary
Zhoushan Demaji Industrial Co., Ltd. is a Zhoushan-based plastics machinery component manufacturer focused on screw-barrel systems for extrusion and injection molding. Founded in 2006, it has built a business around wear-resistant, corrosion-resistant, and application-specific components for plastics processors, with sales reaching both domestic machine builders and overseas markets.
References
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CPS+ eMarketplace. (n.d.). ZHOUSHAN DEMAJI INDUSTRIAL CO., LTD.ZHOUSHAN DEMAJI INDUSTRIAL CO., LTD.. CPS+ eMarketplace. https://www.chinaplasonline.com/eMarketplace/ExhibitorInfo?CompId=1025185Link