Introduction
Zhejiang Sanlong Universal Machinery Co., Ltd. (浙江三龙通用机械有限公司) is a Chinese manufacturer of plastic processing machinery based in Aojiang Town, Pingyang County, Wenzhou, Zhejiang Province. The company is best known for equipment used in the production of PP and PE woven sacks, circular loom-based woven products, plastic tape extrusion, and related nonwoven and composite production lines.
Founded in 1979 according to the company website, and described in other business records as established in 1982, Sanlong is part of China’s long-established cluster of industrial machinery producers in Zhejiang. The company presents itself as a specialist manufacturer of complete production lines for PP/PE woven bag manufacturing and related plastic packaging equipment, with export activity across Africa, Asia, Eastern Europe, Europe, the Middle East, and other markets worldwide. Its product scope and market positioning place it within the broader machinery segment that supplies packaging, industrial textiles, and polymer processing equipment to downstream converters and bag producers.
Sanlong’s published profile also indicates that it operates as both a manufacturer and trading company, maintains ISO 9001 and other certifications, and has developed a patent portfolio reported by third-party business-intelligence sources to include 63 patents. On ChinaPlasOnline, the company is listed as a “Shining Niche” enterprise and as a government-recognized specialized and sophisticated SME, indicating a profile associated with focused technical capability rather than broad diversification.
History and development
Sanlong’s origin is described on its company website as beginning in 1979, under the earlier name Zhejiang General Packaging Machinery Factory (浙江通用包装机械厂), while other corporate and business databases record a formal establishment date of 20 October 1982. The difference likely reflects the distinction between an operating predecessor and the later registered corporate entity.
Key development milestones include:
- Founding and early specialization in machinery for woven bag and packaging production, with a later focus on PP and PE woven sack production lines.
- Expansion into export markets supported by foreign trade rights, with the company describing itself as a self-operated import-export enterprise serving overseas customers.
- Technology and product diversification into circular looms, tape extruders, lamination equipment, cutting and sewing systems, and nonwoven line equipment.
The company also reports a manufacturing base of 35,000 square meters of land area and 25,000 square meters of building area, together with approximately 220 employees on one official profile and a production capability claimed to reach 6,000 units annually. These figures suggest a mid-sized industrial machinery producer with a substantial installed production base relative to its specialized product range.
Business operations and segments
Sanlong’s business model centers on the design, manufacture, and sale of plastics machinery for woven packaging and related polymer-processing applications. Its official and marketplace profiles indicate the following principal business segments:
- Woven bag and sack production lines
- Circular loom systems
- Plastic tape extrusion and winding equipment
- Lamination and composite bag machinery
- Nonwoven fabric production lines
- Cutting, sewing, and finishing equipment
The company also lists plastic packaging machinery, construction machinery, and food machinery within its business scope in corporate registry information, although its public-facing product identity is concentrated mainly on plastics and woven packaging equipment.
Sanlong appears to serve a mixed customer base of domestic and international buyers. Public profiles identify markets in Africa, Asia, Europe, the Middle East, and Eastern Europe, and the company reports that 61%–70% of its business is export-oriented on some platform listings. This export intensity is consistent with the global demand for cost-effective machinery used in food, fertilizer, cement, agricultural, and industrial packaging.
Products and technologies
Sanlong’s product portfolio is built around equipment for converting polymer materials into woven and related packaging formats. Key product categories include:
| Product category | Typical function | Notes |
|---|---|---|
| Circular looms | Weaves polypropylene or polyethylene tapes into tubular woven fabric | Offered in multi-shuttle configurations, including high-speed variants. |
| Plastic tape extruders | Produces flat film or slit tape for woven sack manufacture | Listed as a core product and often paired with tape winders. |
| Tape winders | Winds produced tape for downstream weaving | Common auxiliary equipment in woven bag lines. |
| Lamination machines | Applies coatings or laminates to woven substrates | Relevant for barrier performance and printable sack surfaces. |
| Cutting and sewing machines | Converts tubular woven material into finished bags and sacks | Used in the final stage of bag fabrication. |
| PP spunbond and SMS nonwoven lines | Produces nonwoven fabrics and composite webs | Listed in company descriptions and product pages. |
The company’s product pages and distributor listings indicate a focus on machinery such as 8-shuttle circular looms, 4-shuttle looms, 6-shuttle high-speed looms, and high-speed flat film tape extruders. In woven sack production, the technical importance of such systems lies in output stability, tape uniformity, loom speed, and fabric consistency, all of which affect sack strength and production efficiency.
Sanlong’s association with PP spunbond nonwoven and SMS composite nonwoven equipment suggests an adjacent capability beyond woven sacks, extending into materials used in hygiene, medical, industrial, and filtration applications. That broader technical base is consistent with the company’s placement in the plastic machinery segment rather than a single-product niche.
Applications and end markets
Sanlong’s machinery is used in downstream industries that require polymer-based flexible packaging and industrial fabrics. Based on its product mix and market descriptions, major end markets include:
- Agricultural packaging, including sacks for grain, rice, and feed
- Fertilizer packaging
- Cement and mineral packaging
- Industrial bulk packaging, including woven sacks and jumbo bag-related systems
- Nonwoven textile applications, including spunbond and composite materials
- General flexible packaging production
Market listings associated with the company refer to customers such as food processors, fertilizer exporters, and rice millers, which is consistent with woven sack machinery used for bulk dry goods. The company’s machinery portfolio is therefore positioned at an important point in the plastics value chain: it supplies the equipment used to convert polymer resin into functional packaging and industrial textile products.
Global presence and market position
Sanlong reports active sales to more than one region and continent, including Africa, Asia, Europe, the Middle East, and Eastern Europe. Such a footprint is typical of machinery exporters serving regional bag manufacturers and industrial packaging converters rather than large integrated petrochemical producers.
On ChinaPlasOnline, the company is categorized as a plastic/rubber supplier and marked as a “Shining Niche” company, while a separate listing identifies it as a specialized and sophisticated SME recognized by the Chinese government. This positioning indicates a company that competes through specialization, product depth, and manufacturing know-how rather than by scale alone.
Third-party business data also indicate a patent base of 63 patents, suggesting ongoing product development and incremental engineering work. In the machinery sector, such portfolios often support process improvements, equipment configuration changes, and application-specific customization.
Sustainability and environmental initiatives
Sanlong’s public materials do not provide extensive detail on formal sustainability targets, emissions metrics, or circular-economy programs. However, its machinery focus intersects directly with broader sustainability issues in the plastics industry.
- Material efficiency: Woven sack and nonwoven production equipment can improve resin utilization through controlled extrusion and fabric formation.
- Product durability: Woven packaging often extends service life compared with lower-durability alternatives.
- Process optimization: Modern loom, extrusion, and lamination systems can reduce scrap and improve output consistency.
- Recyclability considerations: PP- and PE-based products may be recyclable depending on local collection and sorting systems, although actual outcomes vary by region and end-use.
Because the company does not publish detailed environmental performance data in the sources reviewed, any assessment of its sustainability profile should remain limited to its product-related role in process efficiency and material transformation.
Financial performance and economic impact
No audited public financial statements were identified in the reviewed sources, and Sanlong does not appear to be a listed company. As a result, revenue, profit, and margin analysis are not available from the sources used here.
Its economic relevance is nonetheless visible in three ways:
- It contributes to industrial employment in Wenzhou and the surrounding manufacturing base.
- It supports downstream packaging capacity in export-oriented and domestic manufacturing sectors.
- It participates in China’s broader equipment export ecosystem, especially for mid-range industrial machinery.
Leadership and corporate governance
Corporate registry data identify Ye Bo (叶波) as the legal representative, with the company registered as a limited liability company and a mixed private ownership structure. Public business databases also indicate a registered capital of RMB 66.16 million and approximately 100–199 employees in one dataset, with another source reporting 132 insured employees in 2025.
Sanlong’s governance profile, based on available sources, reflects a privately controlled machinery manufacturer with export operations and a formalized quality-management structure rather than a public-market governance model.
Innovations and future outlook
Sanlong’s future prospects are likely tied to several industry trends:
- Continued demand for woven packaging machinery in agriculture, fertilizers, and bulk logistics.
- Growth in automation and line integration, as buyers seek lower labor intensity and higher consistency.
- Ongoing interest in nonwoven and composite materials, especially in health, hygiene, and industrial applications.
- Competitive pressure from machinery suppliers that differentiate through speed, precision, energy efficiency, and after-sales support.
The company’s long operating history, patent base, and export orientation suggest a business model centered on incremental engineering and customer-specific solutions. Its standing as a specialized SME also implies that future performance will depend on maintaining product reliability, technical adaptability, and service capability in a price-sensitive machinery market.
Summary
Zhejiang Sanlong Universal Machinery Co., Ltd. is a specialized Chinese manufacturer of plastic processing and woven bag production machinery, with a core business in PP/PE woven sack lines, circular looms, tape extrusion, and related equipment. Rooted in Zhejiang’s machinery sector and active in export markets, the company occupies a focused but meaningful position in the plastics equipment ecosystem, where it serves the packaging, agricultural, and industrial materials industries.
References
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CPS+ eMarketplace. (n.d.). ZHEJIANG SANLONG UNIVERSAL MACHINERY CO.,LTD.ZHEJIANG SANLONG UNIVERSAL MACHINERY CO.,LTD.. CPS+ eMarketplace. https://www.chinaplasonline.com/eMarketplace/ExhibitorInfo?CompId=1016057Link