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  • Kraft Paper Covered Wire
  • Kraft Paper Covered Wire
  • Kraft Paper Covered Wire
  • Kraft Paper Covered Wire
  • Kraft Paper Covered Wire
  • Kraft Paper Covered Wire
  • Kraft Paper Covered Wire
  • Kraft Paper Covered Wire
  • Kraft Paper Covered Wire
  • Kraft Paper Covered Wire
  • Kraft Paper Covered Wire
  • Kraft Paper Covered Wire
Paper Covered Wire

Kraft Paper Covered Wire

Kraft Paper Covered Wire is a high-quality conductor designed to provide reliable insulation protection for transformers, motors and electromagnetic coils. It is wrapped with high-toughness insulating kraft paper, offering excellent oil resistance and moisture resistance.

Copper / AluminumConductor
Round / RectangularProfile
Kraft PaperInsulation
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Product Overview

Conductor

Made from oxygen-free copper or electrical-grade aluminum, with high electrical conductivity after annealing.

Winding Requirements

 Available in various conductor dimensions and paper wrapping methods, including butt wrapping, overlap wrapping, and interlocking wrapping, to meet different transformer winding requirements.

Insulation

Wrapped with high-quality Kraft Paper to provide insulation protection, with excellent oil and moisture resistance.

Technical Specifications

Kraft paper covered wire – Conductor Dimensions

Parameter Range
Rectangular Conductor Thickness (a) 0.80 – 12.00 mm
Rectangular Conductor Width (b) 3.00 – 25.00 mm
Width-to-Thickness Ratio (b/a) ≤ 20
Maximum Cross-Sectional Area 200 mm²
Round Conductor Diameter 2.00 – 5.00 mm




Enameled Paper Covered Wire – Conductor Dimensions

Parameter Range
Rectangular Conductor Thickness (a) 1.00 – 3.00 mm
Rectangular Conductor Width (b) 5.00 – 18.00 mm
Round Conductor Diameter 2.00 – 5.00 mm




Paper Wrapping Methods

Wrapping Method Specification
Butt Wrapping Gap ≤ 0.5 mm
Overlap Wrapping Overlap width 2 – 4 mm
Interlocking Wrapping 50% mutual interlocking


Values shown are typical ranges — exact parameters are confirme.

Material Description

Conductor Materials

① Copper Conductor:
• Made from high-quality oxygen-free copper rods
• Oxygen content < 20 ppm
• Conductivity after annealing > 100% IACS 

 ② Aluminum Conductor:
• Made from high-quality electrical grade aluminum rods
• Conductivity after annealing > 62% IACS

Recommended Proof Strength (Rp0.2) for Semi-Hard Copper:

Grade Rp0.2 Range Resistivity Requirement
C1 100 – 180 N/mm² 1/58 Ω·mm²/m (when Rp0.2 < 200 N/mm²)
C2 180 – 220 N/mm² 1/57.5 Ω·mm²/m (when Rp0.2 > 200 N/mm²)
C3 220 – 260 N/mm²

Insulation Materials

We use premium insulation materials from domestic and international suppliers. Customers may specify preferred brands, models, and specifications:

  • Electrical kraft paper
  • High-elongation fiber paper
  • High-density insulation paper
  • Aramid paper (NOMEX)
  • Thermally upgraded insulation paper
  • PET film

Key Advantages

  • Long Continuous Length


    Kraft Paper Covered Wire can be produced in continuous lengths of up to 8,000 meters without joints, helping reduce winding interruptions and improve transformer production efficiency.

  • High-Conductivity Conductors


    Available with copper conductivity exceeding 100% IACS or aluminum conductivity exceeding 62% IACS, providing flexible conductor options for different transformer designs.

  • Wide Conductor Size Range


    Paper Covered Wire supports rectangular copper or aluminum conductors up to 12.00 mm in thickness, 25.00 mm in width, and 200 mm² in cross-sectional area, accommodating various winding requirements.

  • Flexible Paper Wrapping


    Butt wrapping, overlap wrapping, and interlocking wrapping are available, with overlap widths of 2–4 mm and 50% interlocking for different insulation configurations.

Typical Applications

Customization & Technical Support

Share your drawings and operating equiprements so ourteam can review the right specification.

Discuss Your Requirements
Conductor dimensions
Insulation requirements
Winding and processing needs
Packaging and delivery requirements

Why Choose Yuheng

Engineering Support

Work with us to select suitable materials and specifications for your application.

Quality & Traceability

Consistent manufacturing processes with material traceability.

Manufacturing

Flexible production to support different specifications and customer requirements.

Delivery Coordination

Work with our team on production scheduling and delivery arrangements.

Frequently Asked Questions

What is Kraft Paper Covered Wire used for?

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Kraft Paper Covered Wire is mainly used for power transformers, distribution transformers, reactors, and specialty transformers.

What conductor materials are available?

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We offer copper and aluminum conductors, with copper conductivity exceeding 100% IACS and aluminum conductivity exceeding 62% IACS after annealing.

What paper wrapping methods are available?

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Available methods include butt wrapping, overlap wrapping, and interlocking wrapping, which can be selected according to the required insulation structure.

Can Paper Covered Wire be customized?

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Yes. We offer customization of conductor material, dimensions, mechanical properties, insulation paper, wrapping method, and packaging.

What are the MOQ and lead time?

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The MOQ is 100 kg, with a standard lead time of 7–15 working days.

Related Products

Discuss This Product

Your inquiry will reference Enameled Round Copper Wire.

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