Introduction
ZHOUSHAN DINGHAI SHUANGLI PLASTICS MACHINERY FACTORY (舟山市定海双力塑料机械厂) is a Zhoushan-based manufacturer of plastic machinery components, focused primarily on screws and barrels for extrusion and injection-molding equipment. The company is part of the dense plastics machinery cluster in Dinghai District, Zhoushan, a region widely associated with screw and barrel manufacturing, and it presents itself as a producer of high-end, market-responsive products with an emphasis on innovation and durability.
According to its company materials, Shuangli has positioned itself around the development of wear-resistant and corrosion-resistant barrel technologies, including iron-based alloy barrels and, in 2009, vacuum-sintered nickel-based alloy barrels that the company says significantly extended service life compared with iron-based barrels. Its business profile places it within the upstream machinery and components segment of the plastics industry, where performance of screws and barrels directly affects processing efficiency, product quality, and equipment uptime.
History and Development
Shuangli’s public company descriptions do not provide a detailed corporate chronology, but several milestones are identifiable from its materials:
- The company states that it has long operated in Zhoushan, a location it describes as a major base for screw and barrel research and manufacturing.
- It reports that it was among the earlier domestic producers to develop and manufacture iron-based alloy barrels.
- In 2009, it says it successfully developed vacuum-sintered nickel-based alloy barrels (SBK5 series), describing the technology as filling multiple domestic gaps and improving service life substantially.
These milestones indicate a development path centered on materials engineering rather than on downstream plastics processing equipment as a whole.
Business Operations and Positioning
The company operates as a specialized industrial manufacturer serving plastics machinery producers and processors that require replacement or customized screw-and-barrel assemblies. Its listed address is in Xihou Industrial Zone, Jintang Town, Dinghai District, Zhoushan City, Zhejiang Province, placing it within the broader Zhoushan plastics-machinery ecosystem.
Its positioning appears to rely on three main factors:
- Specialization in wear-resistant and corrosion-resistant screw-barrel products.
- Process know-how in alloy selection, design, and precision grinding.
- Cluster advantages from Zhoushan’s concentration of related suppliers, machining capability, and logistics links.
Products and Technologies
Shuangli’s publicly visible materials emphasize screw and barrel systems and related parts for plastics machinery. The company indicates that it uses high-quality alloy steel, contemporary design concepts, and CNC screw root grinding to produce screws with stable quality and competitive value.
Technical characteristics highlighted by the company
- Iron-based alloy barrels for enhanced wear performance.
- Vacuum-sintered nickel-based alloy barrels introduced in 2009.
- Claims of extended service life for the SBK5 series, which the company says is more than eight times that of iron-based barrels.
- Use of precision machining and grinding equipment to improve dimensional stability and product consistency.
In industry terms, these products are core consumables and critical components for plastics-processing lines, where barrel wear, screw profile design, and metallurgy materially influence melt plasticization, output stability, and maintenance intervals.
Applications and End Markets
The company’s products are used in the machinery sector rather than sold directly as finished consumer plastics goods. Based on the nature of its product line, its customer base is most likely concentrated in:
- Injection molding
- Single-screw extrusion
- Twin-screw extrusion
- Replacement and maintenance markets for worn barrels and screws
This aligns with the broader Chinese screw-and-barrel manufacturing cluster, where suppliers serve plastics processors, equipment makers, and aftermarket users seeking higher wear resistance or corrosion resistance.
Global Presence and Market Context
Available sources identify the company primarily through its Chinese-language corporate site and trade-exhibition listings, which suggests a business centered on the domestic market with visibility through industry fairs and supplier directories. One exhibition-related listing records Shuangli as an exhibitor in the plastics machinery sector at industry events in China, indicating participation in trade promotion rather than a fully documented multinational footprint.
The company is based in Zhoushan, a city repeatedly described by industry sources as a major screw and barrel manufacturing hub, which has helped create a concentrated supplier ecosystem for plastics machinery components. That regional specialization is an important part of its market context and likely supports subcontracting, machining availability, and component trade.
Sustainability and Environmental Considerations
Shuangli’s available public materials do not provide detailed environmental reporting, emissions data, or formal sustainability targets. Its product strategy nonetheless has an indirect sustainability dimension: longer-lasting screws and barrels can reduce replacement frequency, material waste, and downtime in plastics processing.
At the same time, the company operates in a sector under broader pressure to improve energy efficiency, extend equipment life, and reduce the environmental burden associated with plastics manufacturing and maintenance. No public source in the provided results indicates specific environmental certifications or decarbonization programs for the company.
Financial Performance and Scale
No reliable public financial statements, revenue figures, or audited scale data were found in the provided sources. The company appears to be a specialized private manufacturer rather than a publicly listed enterprise, so its financial performance is not readily visible from standard market disclosures.
Leadership and Corporate Identity
The company’s public-facing materials identify it as 浙江精注机械有限公司 / 舟山市定海双力塑料机械厂, indicating that the factory brand is associated with a broader corporate identity used in its official materials. The available sources do not provide a complete public list of senior management or governance structure.
Innovations and Future Outlook
Shuangli’s technological emphasis suggests that its competitive path depends on continued progress in:
- Alloy metallurgy
- Surface hardness and wear resistance
- Corrosion resistance
- Precision machining and grinding
- Product life extension for demanding polymer-processing applications
In the plastics machinery supply chain, screw-and-barrel makers compete largely on durability, compatibility with processing conditions, and cost-performance balance. Shuangli’s stated focus on vacuum-sintered nickel-based alloys and CNC-based finishing indicates that it is pursuing the type of incremental engineering improvement that matters in this niche.
Summary
Shuangli is a specialized Zhoushan plastics machinery manufacturer focused on screws, barrels, and related components for extrusion and injection-molding applications. Its public materials emphasize materials innovation, particularly alloy-based wear-resistant and corrosion-resistant barrels, and place the company within the broader Zhoushan screw-and-barrel manufacturing cluster that is central to China’s plastics machinery supply chain.
References
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CPS+ eMarketplace. (n.d.). ZHOUSHAN DINGHAI SHUANGLI PLASTICS MACHINERY FACTORYZHOUSHAN DINGHAI SHUANGLI PLASTICS MACHINERY FACTORY. CPS+ eMarketplace. https://www.chinaplasonline.com/eMarketplace/ExhibitorInfo?CompId=1016652Link