Fiberglass Sleeving Braiding Solutions
Professional braiding equipment for motor insulation, wiring harness protection, and high-temperature sealing
Fiberglass sleeving is widely used in motor insulation, wiring harness protection, and high-temperature environment sealing. Its braiding process has special requirements for equipment precision, tension control, and post-processing. Fengyan Machinery provides full-series fiberglass sleeving braiding solutions covering Class A to Class C insulation grades, meeting high-end applications from household appliances to aerospace.
Applicable Materials
E-glass alkali-free fiberglass (300-1200tex)
C-glass medium-alkali fiberglass
silane coupling agent sizing
polyurethane coating
silicone coating
PTFE coating
Braiding Process
Sizing Treatment
Glass fiber yarn must undergo sizing treatment (silane coupling agent or paraffin emulsion, 1.5-3.0% solids), increasing friction coefficient to 0.35-0.45, improving bundle cohesion and abrasion resistance. Drying temperature 80-100°C, time 15-20 minutes.
Precision Braiding
Using 24-32 carrier braiding machines, carrier speed controlled at 120-180rpm. Braiding angle 38°-42°, per-yarn tension 0.3-0.8N, inter-carrier variation ≤3%. For heavy-duty sleeving with wall thickness ≥1.5mm, use double-layer braiding process.
Heat Setting Treatment
Braided sleeving passes through a high-temperature oven (380-420°C, 30-60 seconds), allowing glass fiber molecular structure to rearrange, eliminating braiding internal stress and stabilizing dimensions. Post heat-setting shrinkage controlled within 1%.
Surface Coating and Curing
Coating selected by insulation class: Class F (155°C) polyurethane, Class H (180°C) silicone, Class C (>220°C) PTFE. Coating thickness 0.05-0.15mm, curing temperature 150-200°C, time 20-40 minutes.
Quality Inspection
Pass voltage withstand test (2kV/1min no breakdown), insulation resistance test (≥10¹² Ω·cm), tensile strength test (≥200N/10mm), abrasion resistance test, and flame retardancy test (UL VW-1).
Recommended Equipment
FY-24 High Speed Braiding Machine
Suitable for medium-diameter (6-16mm) standard insulation sleeving braiding
Config: Recommended options: low-tension control system, ceramic yarn guides, anti-static device
FY-32 High Speed Braiding Machine
Suitable for large-diameter (10-25mm) and double-layer braided sleeving
Config: Recommended options: double-layer carrier seat, precision pitch control, online wall thickness monitoring
Key Process Parameters
| Applicable Sleeving Diameter | 2-25mm |
| Braiding Carriers | 24/32 carriers |
| Spindle Speed | 120-180 RPM |
| Braiding Angle | 38°-42° |
| Per-Yarn Tension | 0.3-0.8N |
| Braiding Pitch | 15-60mm |
| Heat Setting Temperature | 380-420°C |
| Coating Curing Temperature | 150-200°C |
| Insulation Class | Class A/F/H/C |
| Voltage Withstand Class | 1-35kV |
Quality Control Standards
Voltage Withstand Test
IEC 60684: 2kV/1min no breakdown
Insulation Resistance
Normal ≥10¹² Ω·cm, after damp heat ≥10¹⁰ Ω·cm
Tensile Strength
Axial ≥200N/10mm width
Abrasion Resistance
Taber abrasion 1000 revolutions mass loss ≤5%
Flame Retardancy
UL VW-1 vertical burning standard
Thermal Aging
After 180°C/168h, tensile strength retention ≥80%
Frequently Asked Questions
Why does fiberglass sleeving braiding require low speed?
Glass fiber is brittle and breaks easily when bending radius is less than 3mm. Excessive carrier speed causes yarn tension fluctuations from increased centrifugal force, raising breakage risk. Additionally, glass fiber has low surface friction coefficient (0.15-0.25), and high-speed operation generates flyings that accelerate guide wheel wear and pollute the workshop.
What are the differences between coatings for different insulation classes?
Class F (155°C) uses polyurethane coating, lower cost, suitable for general motor insulation; Class H (180°C) uses silicone coating with better high-temperature performance and flexibility, suitable for high-temperature motors and transformers; Class C (>220°C) uses PTFE coating with best chemical corrosion resistance and non-stick properties, suitable for aerospace and nuclear power extreme environments.
How are inner and outer layer parameters configured for double-layer braided sleeving?
Inner layer uses finer count yarn (300-450tex) at smaller angle (35°-38°) for softness and conformability; outer layer uses coarser count yarn (600-900tex) at larger angle (42°-45°) for abrasion resistance and crush strength. Opposite braiding directions significantly improve anti-twist performance.
Related Products
FY-24 High Speed Braiding Machine
24 carriers | 260 RPM | 2.2kW
FY-32 High Speed Braiding Machine
32 carriers | 240 RPM | 3.0kW
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