Introduction
ZHOUSHAN FIVE-STAR MACHINERY MANUFACTURING CO., LTD. (舟山市五星机械制造有限公司) is a Chinese manufacturer specializing in screws and barrels for plastics processing equipment, particularly injection molding machines and extruders. The company is based in Jintang Town, Zhoushan, Zhejiang Province, a region widely associated with screw-and-barrel manufacturing, and it serves domestic and export markets with components used across plastics, rubber, and related machinery sectors.
The company’s core business is the design and production of plasticizing components—notably single-screw, parallel twin-screw, and conical twin-screw assemblies—along with matching barrels, feed cylinders, and related processing parts. Its product range is positioned for a broad machine size spectrum, including injection molding machines from 30 to 20,000 grams, single-screw extruders from Φ15 to Φ300 mm, parallel twin-screw extruders from Φ30 to Φ250 mm, and conical twin-screw extruders from Φ35/Φ75 to Φ92/Φ188. The company also states that it manufactures wear-resistant and corrosion-resistant variants, including bimetallic and nickel-based alloy screw and barrel assemblies, reflecting the technical demands of recycled materials, abrasive compounds, and chemically aggressive polymers.
As a component supplier, Five-Star sits in a critical part of the plastics value chain: the screw and barrel directly affect melting efficiency, mixing quality, pressure generation, output stability, and service life in downstream processing equipment. Its development has been tied to the growth of China’s plastics machinery cluster in Zhejiang, and industry listings describe it as an established producer with decades of experience in precision screw and barrel manufacturing.
History and development
The company’s development is generally described as beginning in the 1980s, with one company profile stating it was established in 1986 and later developed into a large-scale domestic manufacturer through accumulated technical experience and equipment upgrades. Another industry directory lists the registration year as 2001, which likely reflects a later legal registration or restructuring rather than the original founding date.
Key milestones commonly associated with the company include:
- Founding and specialization in screw-and-barrel production for injection molding equipment and extrusion machinery.
- Expansion into multiple machine categories, including single-screw, parallel twin-screw, and conical twin-screw systems, as well as rubber machinery, chemical fiber machinery, and petroleum-related equipment.
- Adoption of advanced surface engineering and alloy technologies, including nitriding, precision grinding, polishing, spray-welded bimetallic structures, and nickel-based alloy materials for higher wear and corrosion resistance.
The company’s location in Zhoushan’s Jintang Town has likely been strategically important, as the area is repeatedly identified in industry materials as a major Chinese center for screw and barrel production.
Business operations
Five-Star is described as a manufacturer rather than a trading company, with production focused on screw and barrel assemblies and related machining services. Its operations include:
- Manufacture of standard and customized screw-barrel sets.
- Processing and machining services for domestic and international equipment makers, universities, and research institutes.
- On-site measurement, design, repair, and retrofitting services for extrusion equipment.
- Export-oriented sales, with company materials describing a presence in overseas markets and participation in international industry listings.
The company’s business model is characteristic of specialized upstream equipment-component suppliers in plastics machinery: it combines OEM-style component manufacturing, custom engineering, and aftermarket service for wear parts and machine retrofits.
Products and technologies
Five-Star’s main products are screws and barrels for plastics processing equipment. These components are central to the plasticizing section of molding and extrusion systems, where resin is conveyed, compressed, melted, homogenized, and metered.
Main product categories
- Injection molding screws and barrels for domestic and imported machines.
- Single-screw extruder screws and barrels.
- Parallel twin-screw extruder screws and barrels.
- Conical twin-screw extruder screws and barrels.
- Rubber machinery components and parts for chemical fiber and petroleum machinery applications.
Materials and processing capabilities
The company states that its products are based on 38CrMoAlA steel, a common alloy used in screw and barrel manufacturing because of its balance of strength, machinability, and nitriding response. Its stated processing sequence includes:
- Quenching and tempering
- Normalization
- Nitriding
- Precision grinding
- Polishing
It also manufactures GH113 nickel-based alloy screw and barrel assemblies and offers spray-welded bimetallic variants. These material options are significant because they improve resistance to abrasion, corrosion, and wear in demanding applications such as glass-filled plastics, recycled resins, and chemically aggressive compounds.
Technical significance
In plastics machinery, the screw-and-barrel pair determines much of the machine’s processing behavior, including:
- melt quality and temperature control
- dispersive and distributive mixing
- output consistency
- wear life and maintenance intervals
Five-Star’s focus on wear-resistant and long-life designs aligns with market demand for processing recycled materials and filled compounds, where component wear is typically accelerated.
Applications and end markets
The company’s products are used in several downstream sectors:
- Injection molding
- Plastics extrusion
- Rubber processing
- Chemical fiber machinery
- Petroleum machinery
Within plastics processing, the components are relevant to applications such as packaging, consumer goods, construction products, pipes, profiles, sheet and film systems, and compounding lines, although the company’s source materials do not provide a detailed end-market breakdown.
Because screws and barrels are highly application-specific, the company’s ability to provide custom dimensions and alloy configurations is commercially important for processors handling abrasive, corrosive, or recycled feedstocks.
Global presence and market position
Publicly available profiles describe Five-Star as a long-established screw-and-barrel producer in China’s Zhoushan manufacturing cluster. Industry listings also present it as an exporter and a supplier with international market exposure, including appearances in plastics trade directories and exhibition platforms.
Its market position appears to be that of a specialized mid-to-large component manufacturer rather than a diversified conglomerate. The company’s competitive strengths, based on available information, include:
- specialization in a narrow but essential component category
- multi-machine compatibility
- custom engineering and retrofit services
- wear-resistant and corrosion-resistant material options
- location in a recognized manufacturing hub
Sustainability and environmental initiatives
The available sources do not provide a formal sustainability report or quantified emissions data for the company. However, some of its product positioning is relevant to sustainability trends in plastics processing.
Notably, the company highlights wear-resistant designs and longer service life, especially for recycled materials. In practical terms, longer-lasting screws and barrels can reduce replacement frequency, downtime, and material waste in processing operations. This is an operational durability benefit rather than a full environmental program, but it is consistent with industry efforts to improve resource efficiency.
Financial performance and economic impact
No audited financial statements or revenue figures were identified in the available sources. The company’s economic impact is therefore best understood through its role in supplying a foundational equipment component to plastics processors and machinery builders.
As a parts manufacturer in a machinery cluster, Five-Star contributes to:
- local industrial employment
- machining and metalworking activity
- support for China’s plastics machinery supply chain
- export-oriented manufacturing from Zhejiang’s industrial base
Leadership and corporate identity
Publicly accessible sources identify the company as a limited liability company and manufacturer, with contact information and an address in Xihou Industrial Cluster, Jintang Town, Zhoushan. However, detailed governance information, board structure, and executive biographies were not available in the provided material.
Innovations and future outlook
The company’s technology direction appears focused on durability, customization, and compatibility with diverse processing lines. In the plastics industry, these capabilities are increasingly important as processors face:
- greater use of recycled and contaminated feedstocks
- higher demand for corrosion-resistant tooling
- tighter process windows in extrusion and molding
- pressure to minimize downtime and maintenance costs
Its continued relevance is likely to depend on how effectively it advances alloy engineering, surface treatment, and application-specific screw geometry for modern polymer processing.
Summary
ZHOUSHAN FIVE-STAR MACHINERY MANUFACTURING CO., LTD. is a specialized Chinese manufacturer of screws and barrels for injection molding and extrusion machinery, with additional services in custom machining, repair, and retrofit support. Positioned in Zhoushan’s established screw-and-barrel manufacturing hub, the company serves an essential upstream niche in the plastics industry by supplying wear-critical components that affect processing efficiency, product quality, and equipment lifespan.
References
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CPS+ eMarketplace. (n.d.). ZHOUSHAN FIVE-STAR MACHINERY MANUFACTURING CO., LTD.ZHOUSHAN FIVE-STAR MACHINERY MANUFACTURING CO., LTD.. CPS+ eMarketplace. https://www.chinaplasonline.com/eMarketplace/ExhibitorInfo?CompId=1016162Link