Introduction
Zhoushan Dinghai Lucheng Screw Machinery Factory is a Zhoushan-based Chinese manufacturer of screw and barrel systems for plastics and rubber processing machinery, with a product range that includes single-screw barrels, conical and parallel twin-screw extruder components, and special-shaped plastic tube production lines. The company is located in Jintang, Dinghai District, Zhoushan, Zhejiang Province, within one of China’s best-known industrial clusters for screw and barrel manufacturing, and its published materials indicate a focus on precision production, materials engineering, and extrusion-related equipment serving plastics processors in domestic and export markets.
The factory’s business profile places it in the downstream machinery-supply segment of the plastics industry, where screw geometry, barrel metallurgy, surface treatment, and wear resistance strongly affect extrusion stability, throughput, mixing quality, and service life. Its product descriptions emphasize decades of process refinement, imported technical foundations, and a portfolio spanning extruder screws, injection-machine screws, rubber processing screws, planetary screws, pin screws, and bimetallic or nitrided barrel technologies.
History and Development
The company’s own materials describe it as a longstanding enterprise that has developed its production processes through “decades” of continual improvement after initially adopting technology introduced from abroad. Its presence in exhibition and supplier directories shows that it has been active in the plastics machinery supply chain for an extended period and has been listed as an exhibitor or supplier in industry-facing platforms for international buyers.
Several concrete development markers appear in the available records:
- The factory is documented as a specialist manufacturer of screw and barrel products, rather than a general machinery producer, indicating an early and sustained focus on a narrow but technically demanding niche.
- Its catalog expanded from standard extruder components to include taper-type and parallel-type twin-screw extruder parts and special-shaped plastic tube production lines, suggesting diversification beyond basic replacement parts into more application-specific equipment.
- Its listed export activity shows that the company has moved beyond a purely local role and has supplied products to multiple overseas markets, including customers across Europe and Asia according to its supplier description.
The company’s location in Jintang, Dinghai aligns with the broader development of Zhoushan as a manufacturing base for screw and barrel equipment, where many related firms cluster around shared machining, heat-treatment, and export logistics capabilities.
Business Operations and Segments
Lucheng’s core business is the manufacture of screws, barrels, and related extrusion-machine components for plastics and rubber equipment. Its published product scope suggests that it serves multiple subsegments of the polymer-processing equipment market:
- Extrusion components for single-screw extruders.
- Twin-screw extruder parts, including conical and parallel configurations.
- Injection molding machine screws and barrels.
- Rubber-processing screws and barrels.
- Special-purpose or customized tube-production lines.
The company’s positioning is consistent with a supplier that sells to machinery builders and processors rather than a maker of finished plastic products. In practical industry terms, that places it in the part of the value chain responsible for the wear-critical and performance-critical elements that determine how polymers are plasticized, conveyed, mixed, vented, and metered inside the machine.
Products and Technologies
Lucheng’s product information shows a strong emphasis on screw-barrel engineering, including mechanical design, metallurgy, and surface treatment. The company lists several product families and technical parameters that are common in industrial extruder-component manufacturing.
Main product lines
- Single-screw barrels with diameters from roughly 15 mm to 360 mm and \(L/D\) ratios in the range of 15–45 for extrusion applications.
- Parallel twin-screw barrels in sizes such as Φ50/2, Φ65/2, Φ80/2, Φ90/2, Φ105/2, Φ125/2, Φ130/2, Φ150/2, Φ180/2, and Φ200/2.
- Conical twin-screw barrel systems such as SJS 35, SJS 51, SJS 55, SJS 65, SJS 80, and SJS 92.
- Rubber screw and barrel sets for rubber extrusion equipment.
- Pin screws, cold-feed and hot-feed screws, and planetary screws for specialized compounding or processing equipment.
Materials and processing technologies
The company’s listed materials and treatments include:
- 38CrMoAlA alloy steel for general screw and barrel manufacture.
- Bimetallic and wear-resistant spray-coating processes for improved abrasion and corrosion resistance.
- Nitriding processes, with published figures indicating surface hardness and case depth targets suited to wear-critical service.
- Use of dual-phase stainless steel and powder metallurgy materials in certain product applications.
Technical characteristics
Published technical data indicate the company works with:
- Quenched and tempered hardness in the HB260–290 range.
- Nitrided hardness in the HV800–1050 range.
- Nitrided case depth of approximately 0.4–0.7 mm.
- Surface roughness targets around Ra 0.4 for selected parts.
These figures are consistent with the industrial requirement that screw and barrel surfaces withstand friction, corrosive additives, fillers, and thermal cycling while preserving dimensional accuracy and polymer-flow behavior.
Applications and End Markets
The company’s product set points to end markets in plastics extrusion, injection molding, and rubber processing. Its screw and barrel assemblies are relevant to a wide variety of polymer-processing lines, including:
- Pipe and profile extrusion
- Special-shaped tube production
- Pelletizing and compounding
- Injection molding machine rebuild and replacement
- Rubber extrusion and feed systems
Because screw geometry directly affects melting, mixing, pressure generation, residence time, and output stability, suppliers such as Lucheng serve a technically important role in the plastics manufacturing ecosystem. This role is especially significant in applications that use filled, recycled, or corrosive materials, where wear resistance and corrosion protection are critical to machine uptime and product consistency.
Global Presence and Market Position
Lucheng’s business materials describe its products as reaching customers across China and being exported to “more than ten” countries and regions in Asia and Europe. The company also appears in international sourcing directories and plastics exhibition listings, indicating participation in export-oriented trade channels rather than only regional domestic sales.
Its market position is best understood as that of a specialized mid-sized component manufacturer embedded in the Zhoushan screw-and-barrel cluster, where many competing firms concentrate on similar machinery parts for plastics and rubber processing. Within that environment, differentiation depends less on brand scale than on machining precision, material choices, customization capability, and reliability of wear performance.
Research and Development
The company states that its production process has been “further developed and optimized” through long-term effort and innovation, which suggests incremental in-house engineering rather than purely standard production. The breadth of its catalog also implies design capability for different polymer-processing requirements, including geometries for conical twin-screw, parallel twin-screw, single-screw, and specialty feed systems.
In practical terms, R&D in this segment commonly focuses on:
- screw-profile optimization,
- barrel alloy selection,
- bimetallic lining and spray coatings,
- nitriding depth control,
- and adaptation to specific resin systems or filler loads.
Lucheng’s published technical parameters and material listings indicate that these themes are present in its manufacturing approach.
Quality Management and Manufacturing Characteristics
The company’s profile emphasizes high-precision production machinery and a “perfect management” system as the basis for product quality. Its product specification sheets also disclose hardening, nitriding, and surface-finish targets, which are standard indicators of a process controlled for dimensional stability and service performance.
In the screw-and-barrel industry, quality control typically depends on metallurgical consistency, heat-treatment repeatability, and inspection of critical dimensions and surface condition. Lucheng’s published focus on these factors places it within the engineering-intensive portion of plastics machinery supply.
Sustainability and Environmental Considerations
For screw-and-barrel manufacturers, the main environmental issues generally relate to energy-intensive machining and heat treatment, metal consumption, and the service-life impact of wear-resistant components. Longer-lasting screw and barrel assemblies can reduce replacement frequency, which may lower material use and downtime in customer plants.
Lucheng’s publicly described use of nitriding, bimetallic coatings, and wear-resistant materials is relevant to that durability dimension, because extended component life can be an indirect efficiency benefit for plastics processors. At the same time, the broader plastics machinery sector is under pressure to improve compatibility with recycled resins, filled compounds, and energy-efficient processing, all of which place greater demands on screw design and barrel materials.
Industry Context
Zhoushan is widely recognized as a concentrated manufacturing base for screw and barrel production, and Lucheng operates within that industrial ecosystem rather than as an isolated producer. This cluster structure supports access to machining capability, specialist labor, and regional supply chains for alloy processing and finishing, while also intensifying competition among many similar manufacturers.
In that context, Lucheng’s significance lies in its role as a component supplier for plastics and rubber machinery, where performance is judged by wear resistance, processing stability, and customization rather than by consumer brand visibility.
References
- •
CPS+ eMarketplace. (n.d.). ZHOUSHAN DINGHAI LUCHENG SCREW MACHINERY FACTORYZHOUSHAN DINGHAI LUCHENG SCREW MACHINERY FACTORY. CPS+ eMarketplace. https://www.chinaplasonline.com/eMarketplace/ExhibitorInfo?CompId=1011297Link