Flow Distributor (Manifold)

A flow distributor, commonly called a manifold in extrusion systems, is a critical component in die heads that receives molten polymer from a single inlet and divides it into multiple uniform streams. It ensures consistent flow distribution to each extrusion channel, maintaining uniform wall thickness and preventing flow imbalances that could cause product defects. The design incorporates flow channels with specific geometries to minimize pressure drops and residence time variations.

The manifold operates on fluid dynamics principles, using tapered or coat-hanger shaped channels to distribute molten polymer from a central feed to multiple outlets. It maintains constant pressure drop across all flow paths through carefully calculated channel cross-sections and lengths, ensuring each extrusion port receives equal flow rate and pressure. The design compensates for flow resistance differences between central and peripheral channels.