Rectangular and Round Dual-size Pultrusion Die

Rectangular and round dual-size pultrusion die shows two die blocks side by side — one producing a rectangular hollow profile, the other a large round tube. This configuration demonstrates the range of die sizes and geometries that can be produced on the same pultrusion line.

Die Comparison

The left die is a compact rectangular hollow section die with a small square cavity. The right die is a larger round-tube die with a substantial circular opening and bolted flange. Together they illustrate the versatility of pultrusion tooling — from small instrument tubes to large structural pipes.

Key Features

• Both dies share the same mounting interface for quick line changeover.

• Heating cartridges integrated into each die block.

• Internal mandrels form the hollow cavities.

• Precision-ground cavities for dimensional accuracy.

• Durable steel construction for long production life.

Product Applications

The rectangular profile is used for structural framing, equipment supports, and cable management. The round tube is used for process piping, handrails, and structural columns. Having both die sizes available allows a fabricator to offer a full range of FRP profiles without investing in multiple pultrusion lines.

Die Changeover

Changing from the rectangular die to the round die typically takes 2–4 hours: removing the mounting bolts, swapping the die block, re-threading the glass rovings, and adjusting the heating and puller settings. Quick-change die mounting systems reduce this time further.

Conclusion

The rectangular and round dual-size pultrusion die set demonstrates the flexibility of pultrusion tooling. A well-equipped shop can produce a wide range of hollow FRP profiles by swapping die blocks on a single line.