Introduction
Donglong Plastic Machinery Co., Ltd. (Chinese: 泉州市东龙塑胶机械有限公司) is a Chinese manufacturer of plastics-processing machinery based in Quanzhou, Fujian Province. Established in 1994, the company develops and produces extrusion equipment for film production, plastic recycling, and general-purpose polymer processing.
Its product portfolio includes HDPE, LDPE, LLDPE, and PP blown-film machines, single-layer and multilayer co-extrusion systems, cast-film lines, recycling and pelletizing equipment, and extruders in several screw-diameter ranges. The company serves the machinery segment of the plastics value chain, supplying equipment used by converters to transform polymer resins into films, pellets, and other semi-finished products.
Donglong’s development reflects the expansion of China’s plastics-machinery manufacturing base since the 1990s. Its market relevance lies primarily in supplying configurable extrusion systems to domestic and international processors, with equipment capabilities spanning commodity packaging films, recycled materials, and specialized processing requirements.
History and Development
Donglong Plastic Machinery was established in 1994 in Quanzhou, a manufacturing center in Fujian with strong links to packaging, footwear, textiles, consumer goods, and export-oriented industry.
Key development milestones include:
- 1994: Establishment of the company and entry into plastics-machinery manufacturing.
- Subsequent expansion: Development of a broader extrusion portfolio covering blown-film, cast-film, recycling, pelletizing, and general extrusion equipment.
- Quality-system development: Adoption of an ISO 9001-certified quality-management system, supporting standardized production and quality-control procedures.
The company describes its development approach as combining domestic manufacturing experience with the introduction and adaptation of technologies from China and overseas. This has enabled it to offer equipment for both standard production lines and customer-defined processing requirements.
Business Operations and Segments
Donglong operates primarily as an equipment manufacturer for the plastics-conversion industry. Its activities can be grouped into four principal areas:
- Film-extrusion machinery: Equipment for producing mono-layer and multilayer plastic films.
- Cast-film systems: Machinery for producing flat films through a cast-extrusion process.
- Recycling and pelletizing: Lines that process plastic waste or production scrap into reusable granules.
- General-purpose extrusion: Extruders and related equipment for polymer compounding, profile processing, and other applications.
The company’s equipment range includes extruders with screw diameters reported from approximately 30 to 150 millimeters, while some product listings specify ranges extending from 30 to 90 millimeters for particular machine families. This range allows the manufacturer to address both smaller-scale production requirements and higher-throughput industrial applications.
Donglong also undertakes equipment configurations based on customer processing requirements. Such work may involve adapting extrusion capacity, die geometry, film structure, winding arrangements, recycling stages, or auxiliary equipment to suit a particular resin and product specification.
Products and Technologies
Blown-film machinery
Blown-film equipment is a central part of Donglong’s product portfolio. The process melts polymer resin in an extruder, forces the melt through an annular die, inflates it into a tubular bubble, cools the bubble, and collapses and winds the resulting film.
The company’s listed blown-film systems cover:
- HDPE film lines, commonly used for shopping bags, liners, packaging films, and industrial sacks.
- LDPE film lines, used where flexibility, sealability, and optical properties are required.
- LLDPE film lines, frequently used for stretch, agricultural, packaging, and heavier-duty films.
- PP film lines, used for packaging and other applications requiring different stiffness and thermal characteristics.
- Single-layer lines, intended for relatively straightforward film structures.
- Multilayer co-extrusion lines, which combine different polymers or grades in one film to balance properties such as stiffness, toughness, barrier performance, sealability, and cost.
Multilayer extrusion can provide a functional division between layers. For example, one layer may contribute mechanical strength, another may improve sealing, and a third may incorporate recycled or lower-cost material where the product specification permits.
Cast-film machinery
Donglong also supplies cast-film units. In cast extrusion, the polymer melt exits through a flat die and is rapidly cooled on a chilled roll or related cooling system. Compared with blown film, cast-film production can provide precise thickness control, high output, and a flat film format suited to downstream slitting, laminating, or packaging operations.
Cast-film lines may be used for flexible packaging films, industrial films, lamination substrates, and other products requiring controlled gauge and surface characteristics.
Recycling and pelletizing equipment
The company’s recycling machinery is intended to convert plastic scrap into reusable pellets. A typical recycling line can include:
- Feeders and conveying systems
- Cutting or size-reduction equipment
- Washing and drying stages where contaminated waste is processed
- Extruders for melting and homogenizing the material
- Melt filtration systems
- Pelletizers and cooling equipment
Recycling lines must accommodate variation in feedstock contamination, moisture, polymer type, and thermal history. Their performance therefore depends not only on the extruder but also on feed preparation, filtration, temperature control, degassing, and pelletizing configuration.
General-purpose extruders
Donglong produces extruders in multiple screw-diameter classes. These machines can be configured for different throughput levels and polymer-processing requirements. Important engineering variables include screw design, length-to-diameter ratio, drive power, temperature-control zones, die configuration, and auxiliary equipment.
General-purpose extrusion equipment may support the processing of thermoplastics into films, profiles, sheets, pellets, or other intermediate forms. The appropriate configuration depends on resin characteristics, production rate, melt temperature, pressure stability, and the required degree of mixing or homogenization.
Applications and End Markets
Donglong’s machinery serves processors operating across several plastics end markets:
- Flexible packaging: Bags, liners, wrapping films, and multilayer packaging structures.
- Industrial packaging: Heavy-duty sacks, protective films, and material-handling products.
- Agricultural films: Films used in crop production, soil management, greenhouse cultivation, and related applications.
- Consumer-goods packaging: Films for retail and household products.
- Recycling: Processing of post-industrial and selected post-consumer plastic waste into reusable pellets.
- Plastic-product manufacturing: Extruded semi-finished materials used in downstream conversion.
The company’s exposure to these markets is linked to broader demand for lightweight packaging, efficient material use, multilayer functionality, and recycling capacity. At the same time, film-machine manufacturers must respond to regulatory pressure concerning single-use plastics, recycled content, packaging design, and end-of-life management.
Global Presence and Market Position
Donglong is headquartered in Quanzhou, Fujian Province, at the Donghai Bincheng Industrial Park. Its location provides access to China’s machinery-manufacturing supply chains and to the export infrastructure serving Asian and international customers.
Company and industry-directory profiles describe Donglong as serving overseas as well as domestic customers. Its product range positions it within the highly competitive market for Chinese extrusion machinery, where manufacturers compete through equipment configuration, price, delivery capability, technical support, and after-sales service.
The company’s market position is best understood as that of a specialized extrusion-equipment supplier rather than a polymer producer or plastics converter. It participates in a segment populated by machinery manufacturers offering overlapping categories of blown-film lines, cast-film systems, recycling equipment, and extruders. Differentiation in this segment commonly depends on:
- Stability of film thickness and output
- Energy consumption and production efficiency
- Compatibility with multiple resin grades
- Degree of automation and process monitoring
- Ease of maintenance and availability of spare parts
- Ability to configure lines for customer-specific products
Research and Development
Donglong’s technology development is centered on the adaptation and improvement of extrusion equipment. Its product scope indicates engineering activity in several areas:
- Multilayer die and feed-block configurations
- Extruder and screw-design adaptation for different polymers
- Film cooling, collapsing, and winding systems
- Recycling and melt-filtration arrangements
- Equipment customization for special processing requirements
For film producers, technical development is closely associated with improved gauge uniformity, higher line speeds, more stable bubble control, reduced material waste, and lower energy use. For recycling applications, important development priorities include improved contaminant removal, melt stability, filtration performance, and reliable pellet quality.
The company’s stated willingness to undertake customer-provided processing requirements suggests an application-engineering model in which equipment is adapted to the intended resin, film structure, output target, and factory conditions.
Sustainability and Environmental Initiatives
Donglong’s sustainability relevance arises principally through the machinery it supplies rather than through the production of plastics resin itself. Its recycling and pelletizing equipment can support the recovery of plastic scrap and the reintroduction of recycled material into manufacturing streams.
The environmental value of recycling equipment depends on the quality and origin of the feedstock, the energy used during sorting, washing, drying, and extrusion, the achievable recycled-material quality, and the availability of suitable end markets. Mechanical recycling is generally more effective when waste streams are sufficiently sorted and when the recycled polymer can meet the technical requirements of the intended application.
Multilayer film machinery also presents a mixed sustainability picture. Multilayer structures can reduce material use or improve product performance, but some combinations of polymers can complicate recycling. Consequently, equipment development is increasingly connected with design-for-recycling principles, mono-material structures, downgauging, recycled-content integration, and improved process control.
Quality Management and Certifications
Donglong has been identified in company and industry-directory profiles as holding ISO 9001 certification. ISO 9001 provides a framework for quality-management processes, including documented procedures, process control, corrective action, and continual improvement.
For plastics machinery, quality management affects several stages of the equipment life cycle:
- Component procurement and inspection
- Machining and assembly
- Electrical and control-system integration
- Factory testing
- Installation and commissioning
- Technical documentation and after-sales support
Certification does not by itself establish the performance of every machine model, but it indicates the presence of a formalized quality-management framework.
Economic and Industrial Significance
Donglong contributes to the plastics industry as part of the machinery sector that enables polymer conversion. Its equipment connects resin producers with downstream film manufacturers, recyclers, packaging companies, and industrial processors.
The company’s economic significance is associated with several industrial functions:
- Supporting domestic production of plastics-processing equipment
- Enabling investment in film and recycling capacity
- Supplying machinery to small and medium-sized converters
- Creating demand for machining, electrical, automation, and fabrication services
- Facilitating the upgrading or replacement of older extrusion lines
The machinery sector is influenced by polymer prices, packaging demand, export conditions, energy costs, interest rates, environmental regulation, and the investment cycles of converters. Demand for new equipment can weaken when processors defer capital expenditure, but it can increase when producers pursue automation, higher productivity, new film structures, or recycling capability.
Innovations and Future Outlook
Donglong’s future development is likely to be shaped by the convergence of conventional film production and circular-economy requirements. Relevant technology directions include:
- Greater use of multilayer systems designed around recyclable material structures
- Improved integration of recycled resin into film production
- More efficient extruder drives and heating systems
- Automated thickness and process monitoring
- Higher-performance melt filtration for recycling applications
- Digital controls for production data, fault detection, and maintenance
- Equipment configurations that reduce start-up scrap and material losses
The market outlook for extrusion machinery remains connected to continuing demand for packaging and plastic products, but growth is increasingly conditioned by sustainability requirements. Machinery suppliers must therefore balance output, reliability, and cost with energy efficiency, recycled-content capability, regulatory compatibility, and the recyclability of finished products.
Summary
Donglong Plastic Machinery Co., Ltd. is a Quanzhou-based Chinese manufacturer of plastics-processing equipment established in 1994. Its principal activities include the production of HDPE, LDPE, LLDPE, and PP blown-film machinery, multilayer co-extrusion systems, cast-film lines, recycling and pelletizing equipment, and general-purpose extruders.
The company occupies a specialized position within the plastics value chain, supplying the industrial equipment required to convert polymer resins and recovered plastics into films, pellets, and other semi-finished materials. Its development has followed the broader expansion of China’s plastics-machinery industry, while its future prospects depend on technical reliability, customization, international service capability, energy efficiency, and the transition toward more recyclable and resource-efficient plastic products.
References
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CPS+ eMarketplace. (n.d.). DONGLONG PLASTIC MACHINERY CO., LTD.DONGLONG PLASTIC MACHINERY CO., LTD.. CPS+ eMarketplace. https://www.chinaplasonline.com/eMarketplace/ExhibitorInfo?CompId=1037249Link