Double Round Hole Pultrusion Die

Double round hole pultrusion die produces FRP profiles with two parallel circular holes through the cross-section, used for dual-tube cable carriers, structural beams with internal conduits, and specialty tubular profiles. The die end shows two large circular openings side by side.

Profile Design

The die cavity forms a rectangular outer profile with two circular holes running the full length. The holes are formed by internal mandrels that are precisely aligned to maintain concentricity and uniform wall thickness. Outer dimensions and hole diameters are custom-engineered to the customer's structural or cable-management requirements.

Construction Details

• Two precision-ground cylindrical mandrels forming the internal holes.

• Rectangular outer cavity with rounded corners for smooth glass flow.

• Heating system integrated into the die block.

• Bolt pattern for rigid mounting on the pultrusion line.

• Hardened and polished internal surfaces for wear resistance.

Applications

Double-hole FRP profiles serve as dual-compartment cable trays (separating power and signal cables), structural beams with built-in conduit routing, tubular handrails with integrated wiring channels, and support members for overhead piping. The non-conductive FRP material is ideal for electrical and substation applications where steel would corrode or conduct.

Manufacturing Capability

Dies can be designed for hole diameters from 10 mm to 100 mm, with center distances and outer dimensions customized. Wall thickness typically ranges from 3 mm to 8 mm. The die is produced in P20 or H13 tool steel and precision-ground to the cavity drawing.

Conclusion

The double round hole pultrusion die is a specialized tool that enables integrated cable management and structural function in a single FRP profile, reducing installation labor and material cost.