This paper emphasizes effects of wetted surface area and importance of consistent temperature around the die mandrels. Often wetted surface area and consistent temperature is ignored or overlooked when designing the co-extrusion package and attention is only paid in the standard design of a die. Wetted surface area plays an important role in determining the total pressure drop and residence time in a system, which effects final output and versatility. However, some relatively new and complex processes such as spiral design and internal details of the stackable die system still need to be investigated in order to gain a better understanding of the process and its optimization.
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