Electrical Insulation Creped Pressboard Material

Electrical insulation creped pressboard material, commonly known as crepe insulation paper, serves as an indispensable flexible insulation material for transformer coil wrapping processes. Its core difference from flat paper lies in fine crepe structures on the surface – these folds deliver tensile capacity with longitudinal elongation rates ranging from 20% to 30%. When wrapping curved, elliptical and other special-shaped sections of transformer coils, flat paper easily wrinkles and creates gaps, while crepe paper stretches and conforms seamlessly to conductor contours for smooth, gap-free wrapping. Fewer gaps reduce partial discharge probability and extend transformer service life and reliability.

A large power transformer manufacturer previously used flat paper for elliptical coil wrapping, encountering persistent wrinkling at corners causing uneven insulation thickness that kept partial discharge testing results marginally failing standards. We recommended crepe insulation paper, which easily conforms to elliptical shapes without corner wrinkling or gaps, enabling one-time pass of partial discharge testing. They now exclusively adopt our crepe paper for all special-shaped coils with stable monthly procurement of 1,000 kg. Comparative testing shows our crepe paper achieves a 25% elongation rate versus the industry average of only 15% – higher elongation delivers superior conformability for complex geometries. While crepe insulation paper represents a traditional mature product, precise high-quality manufacturing remains challenging.

• Wrapping insulation for special-shaped sections of transformer coils
• Insulation wrapping of transformer bushings
• Insulation cladding of cable joints
• Bandaging of motor coil ends
• All insulation scenarios requiring flexible wrapping performance

Crepe paper customization centers on three dimensions: thickness, width and crepe depth. Thickness ranges from 0.1mm to 0.5mm: thin grades suit tight winding of fine conductors, while thick grades apply to high-current thick conductors. Width spans full 1600mm width to custom-slit narrow strips with a minimum width of 10mm. Crepe depth is adjustable per your wrapping process requirements: deeper crepes deliver higher elongation and flexibility, while shallow crepes offer improved rigidity and strength. Flexible supply formats include rolls, strips and sheets. OEM labeling is fully supported with packaging specifications and label styles customized to your demands. The minimum order quantity is 500 kg, and free small samples are available to test wrapping performance.

Crepe paper is susceptible to moisture absorption and crushing, requiring specialized packaging addressing both risks. The inner layer is sealed with moisture-proof PE film to prevent moisture uptake during transit; rigid paper tubes form roll cores to avoid flattening of rolled products; the outer layer uses thickened corrugated cartons or wooden pallet reinforcement to resist collisions during long-distance transportation. Clear labels affixed to each package indicate product name, specifications, batch number, net weight and production date. Export orders receive reinforced packaging complying with ocean shipping standards to guarantee intact arrival at ports. Trade terms EXW and FOB are supported with convenient shipment from Wenzhou Port. Upon arrival, store goods in dry, ventilated warehouses avoiding direct contact with ground surfaces.

Two core indicators govern quality control of crepe paper: elongation rate and breakdown voltage. Both tests are mandatory for every batch, with batches rejected immediately for elongation rates below 20%. Real-time monitoring of embossing roller temperature and pressure during production ensures uniform crepe depth across all paper segments. Raw materials adopt high-purity sulfate wood pulp free of impurities with neutral pH to eliminate copper conductor corrosion risks. We also conduct moisture absorption rate testing to guarantee slow moisture uptake and stable insulation performance under standard environments. Testing equipment includes tensile strength testers, breakdown voltage testers and electrothermal blast drying ovens, with all data filed for traceability. The company holds ISO9001 certification, and quality control processes strictly comply with national standards.

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