Fiber Grade Polyester/PET Chip serves as the fundamental raw material in the synthetic fiber industry chain, functioning as the critical intermediate for spinning polyester filament, staple fiber, and industrial yarn. Its quality directly determines the physical properties and processing stability of downstream textile products. Manufactured primarily from purified terephthalic acid (PTA) and monoethylene glycol (MEG) through direct esterification continuous polymerization, this product features uniform molecular weight distribution, stable melting points, and excellent color characteristics. It finds extensive applications in high-end garment fabrics, home textile products, and technical textiles. Ningbo Huaxing Technology Co., Ltd., as a major production base for Fiber Grade Polyester Chip and Fiber Grade PET Chip in China, leverages advanced polymerization-spinning integration technology to consistently deliver high-value differentiated polyester chips and downstream filament products to the global market.
Core Characteristics and Technical Specifications of Fiber Grade PET Chip
The industrial value of Fiber Grade PET Chip is reflected in its rigorous physicochemical index control system. Ningbo Huaxing Technology Co., Ltd. employs the advanced direct esterification "five-reactor" polymerization process developed by the China Textile Industry Design and Research Institute. This technology demonstrates superior performance in reaction efficiency and product quality stability. Combined with fully automated spinning and winding equipment imported from Barmag (Germany), the company ensures that every batch of products meets industry-leading standards.
The following table details the key technical specifications of Fiber Grade Polyester Chip, which serve as the core basis for evaluating spinning performance and finished fiber quality:
| Technical Parameter |
Typical Range |
Significance |
| Intrinsic Viscosity (IV) |
0.62 - 0.68 dL/g |
Determines molecular weight, affecting fiber strength and processing window |
| Melting Point |
255 - 265°C |
Reflects crystallinity and thermal stability, related to spinning temperature settings |
| Carboxyl End Group (COOH) |
≤ 30 mol/t |
Low COOH content reduces thermal degradation during spinning, improving spinnability |
| Diethylene Glycol (DEG) Content |
1.0% - 1.5% |
Affects dyeing performance and fiber softness |
| Color (b-value) |
≤ 3.0 |
Controls chip yellowing, ensuring fiber whiteness and dyeing brilliance |
| Moisture Content |
≤ 0.4% |
Excessive moisture causes melt hydrolysis, affecting spinning continuity |
The engineering technology center of Ningbo Huaxing Technology Co., Ltd. is equipped with a comprehensive testing system that monitors the above parameters throughout the entire production process. The company holds 9 independent patents and has developed proprietary intellectual property in polymerization process optimization, additive formulation, and melt filtration technology. These technical capabilities ensure the competitive advantages of Fiber Grade PET Chip in melt uniformity and spinning stability.
Production Capacity and Process Advantages of Ningbo Huaxing Technology Co., Ltd.
Formerly known as Ningbo Huaxing Tire Co., Ltd., the company was established in July 2001. After more than two decades of industrial development, it has evolved into a modern chemical fiber enterprise integrating research and development, production, and sales. The factory covers an area of 185,000 square meters with a building area of 186,000 square meters. The tree-shaded factory environment reflects the company's commitment to green manufacturing and sustainable development.
In 2012, Ningbo Huaxing Technology Co., Ltd. invested over 300 million RMB in comprehensive production line upgrades, establishing a modern production base with an annual capacity of 160,000 tons of high-quality POY pre-oriented polyester filament. This production scale ranks among the top tier of domestic peers, providing solid capacity assurance for the stable supply of Fiber Grade Polyester Chip and downstream filament products. In 2014, the company's sales revenue exceeded 1 billion RMB despite market headwinds, demonstrating strong market competitiveness and risk resilience.
In terms of talent development, the company has assembled more than 20 senior technical professionals across various fields and established a scientific and standardized management system. As a Ningbo municipal-level science and technology enterprise and a demonstration enterprise for information technology construction in Cixi City, Ningbo Huaxing Technology Co., Ltd. continues to invest in intelligent manufacturing and digital transformation, achieving full-process information control from raw material intake to finished product dispatch.
POY Polyester Filament: High-Value Extension of Fiber Grade PET Chip
Leveraging the raw material advantages of self-produced Fiber Grade PET Chip, Ningbo Huaxing Technology Co., Ltd. focuses on developing POY (Pre-Oriented Yarn) polyester filament series products. As the precursor material for DTY (Draw Textured Yarn), POY quality directly impacts the efficiency of subsequent texturing processes and the quality of finished yarns. The company currently offers nearly 20 specifications of conventional and flat yarns, covering mainstream market demands from 50D to 300D.
Fabric processed from POY filaments produced by Ningbo Huaxing Technology Co., Ltd. exhibits the following distinctive characteristics:
- Smooth Hand Feel: Optimized fiber cross-section morphology delivers high fabric surface smoothness and delicate skin contact
- Excellent Drape: Precise molecular orientation control enables natural fabric draping with fluid silhouettes
- Moisture Absorption and Wicking: Through profiled cross-section design and raw material modification, rapid moisture transport and evaporation are achieved
- Thermal Insulation: High fiber bulkiness with abundant static air content effectively blocks heat loss
- High Pilling Resistance: Reasonable matching of fiber tenacity and elongation reduces fuzz entanglement during wear
- Easy Dyeing with Stable Color Fastness: The low DEG content design of Fiber Grade PET Chip ensures uniform dye penetration and firm color fixation
- Unique Luster: Flat yarn series products present a soft silk-like sheen, enhancing the visual quality of fabrics
These performance advantages make the POY filaments of Ningbo Huaxing Technology Co., Ltd. ideal raw materials for high-end garment fabrics, premium blankets, and carpets. The products can partially replace imported equivalent materials, playing an active role in the localization process of domestic high-end chemical fiber materials.
Detailed Application Fields of Fiber Grade Polyester Chip
The downstream applications of Fiber Grade Polyester Chip demonstrate high specialization and segmentation. Ningbo Huaxing Technology Co., Ltd. positions its products in the high-value-added market, primarily serving the following three sectors:
| Application Field |
End Products |
Performance Requirements |
| High-End Garment Fabrics |
Suit linings, fashion womenswear, sportswear |
Soft hand feel, brilliant color, dimensional stability |
| Home Textiles |
Premium blankets, decorative carpets, bedding sets |
Bulky warmth, abrasion and pilling resistance, easy care |
| Technical Textiles |
Automotive interiors, filtration materials, geotextiles |
High strength, weather resistance, chemical stability |
In the high-end garment fabric sector, the differentiated fiber products of Ningbo Huaxing Technology Co., Ltd. achieve multiple style effects including cotton-like, wool-like, and silk-like textures through polymer formulation adjustment and spinning process parameter optimization. These innovations satisfy the diverse raw material demands of fast fashion and high-end customization markets. In the home textile sector, the company's products have become designated raw material suppliers for numerous renowned home textile brands, thanks to their excellent pilling resistance and stable dyeing performance.
Quality Control and Sustainable Development
Ningbo Huaxing Technology Co., Ltd. has established a full-chain quality traceability system from Fiber Grade PET Chip raw materials to POY filament finished products. Each batch of chip products retains critical data including melt index, color value, and agglomerate particle count, enabling downstream spinning customers to rapidly identify causes when process fluctuations occur. The direct esterification "five-reactor" polymerization process adopted by the company offers significant advantages in energy consumption control and batch consistency compared to traditional batch polymerization. While increasing single-line capacity, unit product energy consumption is reduced by approximately 15%.
In terms of environmental compliance, the company strictly adheres to national chemical fiber industry pollutant emission standards. The ethylene glycol recovery rate in the polymerization section exceeds 98%. Wastewater undergoes advanced treatment for recycling, and solid waste is classified, collected, and disposed of through resource recovery. These measures not only reduce production costs but also reflect the social responsibility of Ningbo Huaxing Technology Co., Ltd. as a responsible manufacturing enterprise.
Frequently Asked Questions
What is the fundamental difference between Fiber Grade PET Chip and standard bottle-grade PET chip?
Fiber Grade PET Chip is specifically optimized for spinning processes, with intrinsic viscosity controlled in the range of 0.62-0.68 dL/g, narrower molecular weight distribution, and extremely low ash and metal ion content to ensure melt fluidity and stability at spinnerets. Bottle-grade PET chip typically has higher viscosity (0.70-0.84 dL/g), with acetaldehyde controllers and thermal stabilizers added for injection blow-molding applications. The two grades are not interchangeable.
What is the annual production capacity of Fiber Grade Polyester Chip at Ningbo Huaxing Technology Co., Ltd.?
Following the 2012 production line upgrade, the company's integrated polymerization facility capacity matches its downstream 160,000-ton POY filament capacity, forming a polymerization-spinning vertical integration structure. This integration ensures raw material supply stability and quality consistency, eliminating batch variation risks associated with external chip procurement.
How do raw material requirements differ between POY and FDY filaments?
While both POY (Pre-Oriented Yarn) and FDY (Fully Drawn Yarn) can use Fiber Grade PET Chip as raw material, the FDY process imposes more stringent requirements on melt fluidity and thermal stability. FDY one-step spinning typically operates at 4000-5000 m/min, where melt completes stretching orientation within extremely short timeframes. Therefore, chips with lower carboxyl end group content and more stable melting points are required. The engineering team at Ningbo Huaxing Technology Co., Ltd. can adjust polymerization process parameters according to customer requirements to provide customized chip specifications.
How is the spinnability of Fiber Grade PET Chip evaluated?
Spinnability evaluation requires comprehensive examination of multiple indicators. First, melt rheological properties are measured using a capillary rheometer to determine viscosity variation curves across shear rate ranges. Second, thermal stability is assessed through repeated heating cycles measuring viscosity degradation and color variation. Finally, filtration performance is evaluated by simulating pressure build-up rates during spinneret component service life. The laboratory at Ningbo Huaxing Technology Co., Ltd. is equipped with complete testing facilities and can provide customers with detailed product application data packages.
Does the company offer customized services for differentiated and functional Fiber Grade PET Chip?
Yes. Ningbo Huaxing Technology Co., Ltd. holds 9 independent patents and maintains an engineering technology center with the technical capability to introduce functional additives during the polymer synthesis stage. The company has successfully developed and mass-produced various functional POY filaments including moisture-wicking, anti-static, and flame-retardant varieties. The raw material foundation for these products is Fiber Grade Polyester Chip modified through formulation adjustments. Customers may provide specific functional requirements and target specifications, and the company's R&D team will assess technical feasibility and develop customized solutions.
What is the approximate production cycle from Fiber Grade PET Chip to finished POY filament?
On the integrated polymerization-spinning production line of Ningbo Huaxing Technology Co., Ltd., the entire continuous production process from PTA and MEG raw material charging to POY package doffing typically completes within several hours. The polymerization section employs a "five-reactor" series process where esterification and polycondensation reactions proceed continuously. Melt is transported directly through melt transfer pipelines into the spinning cabinet, eliminating the chip remelting step. This significantly shortens the production cycle and reduces thermal degradation risks. This direct spinning process represents one of the company's core competitive advantages.