Compare with Dotted Insulation Paper (DDP) & Thermally Upgrade Nitrogen Diamond Dotted Insulating Paper (TUDDP)

Diamond Dotted Insulation Paper (DDP) & Thermally Upgrade Nitrogen Diamond Dotted Insulating Paper (TUDDP)

Diamond Dotted Insulation Paper (DDP) is a high-performance electrical insulation material widely used in the power equipment industry, featuring a unique diamond-patterned surface to enhance insulation, mechanical strength and heat dissipation. As an upgraded high-end variant, Thermally Upgrade Nitrogen Diamond Dotted Insulating Paper (TUDDP) is specifically optimized for transformer applications, with the core difference from ordinary DDP lying in the addition of nitrogen modification technology, which significantly improves its performance. Below is a detailed introduction of both materials, including the complete technical parameters of TUDDP.

1. Overview of Diamond Dotted Insulation Paper (DDP)

Diamond Dotted Insulation Paper, commonly abbreviated as DDP (also known as insulation DDP), is a specialized insulating paper with a unique diamond pattern on the surface. It is designed to enhance insulation performance, mechanical strength and heat resistance, making it an indispensable core material in the manufacturing of transformers, motors, reactors and other electrical equipment.

1.1 Production Process of DDP

The production and processing of insulation DDP involves a sophisticated, multi-step process, with strict quality control implemented at every stage-from raw paper selection to final packaging:

Raw Paper Selection: We adhere to stringent standards, exclusively utilizing imported long-fiber electrical-grade wood pulp sourced from frigid regions. This premium wood pulp boasts exceptional fiber strength, toughness, electrical insulation properties, and high-temperature resistance, serving as the cornerstone for the superior performance of our DDP products. Our dedicated raw paper inspection team conducts rigorous testing on the imported wood pulp (including fiber length, purity, moisture content, and electrical performance) to ensure only qualified raw materials proceed to the production line.

Manufacturing Procedures: Firstly, the imported electrical-grade wood pulp is subjected to pulping, refining, and screening processes to remove impurities, guaranteeing the uniformity and fineness of the pulp. Subsequently, the pulp is formed into base paper with consistent thickness and a smooth surface through advanced papermaking technology. Next comes the critical diamond dotting process: using state-of-the-art mechanical equipment, uniformly sized and distributed diamond-shaped dots are embossed on the surface of the base paper-these dots enhance friction with coils to prevent sliding during winding and improve heat dissipation. Finally, the paper undergoes high-temperature drying, calendering, and other finishing processes to further enhance its density, flatness, and insulation performance, ensuring it meets or exceeds national standards.

2. Comparison Between TUDDP (Thermally Upgrade DDP) and Ordinary DDP

The key distinction between TUDDP and ordinary DDP lies in nitrogen modification technology and insulation grade improvement, with detailed differences as follows:

Nitrogen Content: TUDDP contains nitrogen (a core advantage not found in ordinary DDP). In line with international practices, the nitrogen content of TUDDP is strictly controlled between 1.3% and 2.6% (typical value: 1.9%). This precise nitrogen modification optimizes the internal structure of the insulation paper, endowing it with superior anti-aging performance.

Anti-Aging Performance: In complex aging tests simulating long-term high-temperature and harsh working environments, ordinary DDP is prone to aging and degradation, leading to a gradual decline in key indicators. In contrast, TUDDP, benefited from its reasonable nitrogen content, maintains excellent stability-its insulation performance, toughness and other indicators remain well-preserved, effectively avoiding insulation failure and extending equipment service life.

Insulation Grade: Ordinary DDP typically meets Class A insulation standards, with a maximum long-term operating temperature of 105℃. Thanks to nitrogen modification and thermal upgrading, TUDDP is upgraded to Class E insulation, with a maximum long-term operating temperature increased to 120℃, expanding its application scope to high-demand scenarios (e.g., high-voltage transformers).

Common Advantages: TUDDP inherits the advantages of ordinary DDP, including the diamond-dot surface design (enhancing coil friction) and high-quality imported long-fiber pulp from frigid zones, making it more ideal for high-performance power equipment.

3. Industry Knowledge & Complete Technical Parameters of TUDDP

Thermally Upgrade Nitrogen Diamond Dotted Insulating Paper for Transformer (TUDDP) is a high-end upgraded version of traditional DDP, specifically developed for transformer insulation (especially oil-immersed distribution transformers and high-voltage transformers). It integrates nitrogen modification and thermal upgrading technologies, with outstanding heat resistance, insulation stability and service life.

3.1 Core Advantages of TUDDP

Superior Raw Materials: The base paper is made from imported long-fiber needle pine pulp from frigid regions, featuring excellent purity, high polymerization degree and outstanding insulating properties-longer fiber length, better toughness and higher crystallinity than ordinary wood pulp, ensuring mechanical strength and insulation reliability.

Advanced Technologies: Nitrogen modification optimizes the internal structure, enhancing chemical stability, anti-aging performance and reducing moisture absorption rate; thermal upgrading further improves heat resistance (maximum working temperature up to 130℃, thermal rating of Y 90), far exceeding traditional DDP.

Strict Quality Control: Jointly optimized with HongKong Nine dragon LeShan limited, TUDDP meets international standards (IEC 60641-3-2:2007, IEC 60317) and is exported globally, winning recognition from transformer manufacturers.

3.2 Production Process of TUDDP

TUDDP undergoes more precise and complex manufacturing procedures than traditional DDP: on the basis of the traditional diamond dotting process, it adds nitrogen modification and thermal upgrading links. After base paper formation, it is treated with nitrogen under strict temperature and pressure control to ensure uniform nitrogen distribution; then high-temperature thermal upgrading stabilizes the fiber structure and enhances fiber bonding force. The diamond dotting process adopts advanced embossing technology (dots: 9.5mm x 9.5mm, center spacing: 15.9mm) to improve winding tightness. Finally, finished products undergo strict testing (thickness, insulation, heat resistance, nitrogen content, etc.) to ensure qualification.

3.3 Complete Technical Parameters of TUDDP (Based on Data Sheet)

3.4 Product Specifications & Application of TUDDP

TUDDP covers a variety of thicknesses to meet different transformer insulation needs, including 0.08mm, 0.127mm, 0.18mm, 0.25mm, 0.38mm, 0.50mm, etc. Its surface diamond dots are coated with heat-curable epoxy resin-inert, dry and non-adhesive at normal temperature (below 30℃); when the temperature rises to 90℃, the resin melts and solidifies once, bonding the conductor and insulation paper into a solid unit (bonding strength up to 70 psl / ≥0.275 MPa at 100℃, meeting American standards). It is mainly used for insulation between transformer coils.

4. Cooperation, Packaging & Market Layout

4.1 Strategic Cooperation

We have established long-term and in-depth cooperation with HongKong Nine dragon LeShan limited, the largest insulating paper mill in China. As their largest insulating paper purchaser, we have jointly developed a new standard insulation paper specially for DDP (higher than the national standard), and applied mature DDP production and quality control experience to TUDDP R&D and production.

4.2 Packaging Standards

We pay equal attention to protection and convenience: each roll of DDP and TUDDP is wrapped with moisture-proof, dust-proof and anti-collision packaging materials; product information (thickness, specification, production date, batch number, etc.) is clearly marked. For large-volume orders, standardized packaging boxes and wooden pallets are used to ensure products are delivered in good condition.

4.3 Market Performance

All our efforts are centered on export and maintaining strong international competitiveness. Our DDP and TUDDP products are exported to many countries and regions, winning wide recognition and trust from overseas customers with high-quality products, professional services and competitive prices. In the future, we will increase R&D investment to meet changing market needs and maintain our leading position in the global market.

5. Frequently Asked Questions (FAQ) About DDP & TUDDP

To help global customers better understand the two materials, we sort out common questions and answers:

Q1: What is the main difference between DDP and ordinary insulating paper?

A1: The core difference is the unique diamond dot pattern on DDP's surface, which enhances friction with coils to prevent sliding during winding. Additionally, DDP uses imported long-fiber frigid zone electrical-grade wood pulp and undergoes a more complex production process, resulting in better insulation, mechanical strength and heat dissipation than ordinary insulating paper.

Q2: How to choose the right thickness of DDP for different applications?

A2: Selection depends on insulation requirements, operating temperature and winding tightness: 0.05mm-0.13mm for small motors/low-voltage transformers; 0.18mm-0.25mm for medium-voltage transformers/motors; 0.38mm-0.50mm for high-voltage transformers/reactors.

Q3: Are your DDP and TUDDP compliant with international standards?

A3: Yes. DDP meets and exceeds China's national standards, as well as IEC and ANSI standards. TUDDP complies with IEC 60641-3-2:2007 and IEC 60317 standards. All products pass strict quality testing to meet global power equipment manufacturers' requirements.

Q4: What is the main difference between TUDDP and traditional DDP?

A4: TUDDP uses imported long-fiber needle pine pulp (better purity and polymerization degree) and integrates nitrogen modification (1.3%-2.6% nitrogen content) and thermal upgrading technologies, upgrading insulation grade from Class A (105℃) to Class E (120℃), with superior anti-aging performance and heat resistance.