Coex blown film die has shorter flow paths.

"Upside-down conical flow paths in a new five- to seven-layer blown film die from Windmoeller & Hoelscher Corp., Lincoln, R.I., are said to greatly reduce melt inventory and residence time. In conventional conical dies, like W&H's Multicone model, the narrow part of the cone points upward. Melt enters at the bottom, widest point, and the flow-path circumference narrows at the top. But in W&H's new Maxicone die, the cone stands on its point. Flow enters at the center of the narrow bottom of the die through a spoke-like device, or "star distributor," and the cone widens from the bottom up to the die lip. In most conical dies, all layers are equal in diameter and are simply stacked one over another. In the Mexicone, each successive layer diameter is smaller than the one before.

This die is aimed at large bubbles where shorter residence time reduces degradation more significantly than in smaller dies. The first Mexicone die is for seven-layer film with an 86.5-in. layflat. Tel: [phone], www.whcorp.com