Dies and Tooling

A die is a high-strength forming component. Its primary function is to give the molten and homogenized material the required geometry and dimensions as it exits the extruder.

Die Design and Types

Dies differ depending on the shape of the product:

• Flat dies. Used to produce films and sheet materials. They are flat plates with a slot-shaped opening, the width of which determines the sheet width, while the thickness is adjustable.
• Annular dies. Used to manufacture pipes, hoses, and blown film.
• Profile dies. Designed for products with complex cross-sections. They may be flat or streamlined. Streamlined designs with a gradually narrowing channel minimize dead zones and are better suited to heat-sensitive materials.

Mandrels are installed in the die to produce hollow products. A spiral mandrel provides uniform melt-flow distribution, smooths flow-joining lines, and increases the circumferential strength of the product. Adjustable mandrels allow the wall thickness to be changed without replacing the entire die head.

Hapro die types: for film extrusion, sheet, tubing, strands, capillaries, wire coating, and profiles.

Flat die:

Strand: