Rectangular Slotted Pultrusion Die

Rectangular slotted pultrusion die produces FRP profiles with a long rectangular through-slot, commonly used for cable tray side rails, structural beams with internal stiffening, and specialty hollow sections. The die is shown with a dark, polished exterior that indicates high-precision ground surfaces.

Profile Description

The die exit reveals a long rectangular slot running the full length of the die cavity. The profile produced is a rectangular hollow section with a central internal web or a large open slot, depending on the mandrel design. Wall thickness is uniform around the perimeter, and the slot dimensions are held to tight tolerances.

Die Features

• Precision-ground rectangular slot cavity for accurate profile dimensions.

• Internal mandrel (pin) that forms the slot, supported from the die entrance.

• Heating cartridges distributed along the die length for uniform cure.

• Polished internal surfaces for smooth profile ejection.

• Bolt holes for mounting on the pultrusion machine.

Applications

Slotted rectangular FRP profiles are used as cable tray rails, structural support beams, equipment enclosure frames, and custom hollow sections for corrosive environments. The open slot allows mounting of accessories, sensors, or electrical conductors inside the profile. They are also used in building facades as non-corroding window mullions and sunshade supports.

Material Options

Standard polyester resin for general corrosive environments; vinyl ester for strong acid or solvent service; epoxy for high-strength structural applications. Glass reinforcement includes continuous roving along the length and continuous filament mat for transverse strength.

Conclusion

The rectangular slotted pultrusion die is a specialized tool for producing open-slot FRP profiles. Accurate mandrel alignment and controlled heating are critical for uniform wall thickness and consistent profile quality.