Method for controlling a polymer melt extrusion process

By determining the adhesion of polymer processing aids to the die surface and adjusting dosage in real-time, the method stabilizes polymer melt extrusion processes, addressing flow instabilities and optimizing productivity and quality.

WO2026146150A1PCT designated stage Publication Date: 2026-07-09SABIC GLOBAL TECHNOLOGIES BV
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
SABIC GLOBAL TECHNOLOGIES BV
Filing Date
2025-12-29
Publication Date
2026-07-09

AI Technical Summary

Technical Problem

Existing polymer melt extrusion processes face instability due to complex flow conditions, leading to fluctuations in productivity and product quality, with common solutions often resulting in overdosing of polymer processing aids.

Method used

A method for controlling polymer melt extrusion by determining the adhesion of polymer processing aids to the die surface, using a reference extrusion device, and adjusting the dosage in real-time based on measured relations between processing properties and aid efficiency, as described by the model of Jia et al.

Benefits of technology

Enables real-time control of melt fracture phenomena, reducing fluctuations in product properties and minimizing polymer usage, while maintaining high productivity and quality, thus optimizing process efficiency and reducing costs.

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Abstract

The invention relates to a method for controlling a melt extrusion process of a polymer composition using a melt extruder comprising a die, the method involving * determining in a reference extrusion device comprising a die of known geometry, during a reference polymer extrusion run using the polymer composition, the fraction of the inner surface of the die to which particles adhere of a given polymer processing aid that is dosed to the reference extrusion device, under known polymer flow parameters, under steady state operation; * determining the surface quality of the polymer article that is obtained from the reference polymer extrusion run; * determining a relation between a property of the polymer article and / or a processing property, and the polymer processing aid efficiency; and * determining the quantity of the polymer processing aid that is to be dosed to the melt extrusion process using the determined relation. Such method allows for providing a flexible means for operating an extrusion process, enabling real-time control of the occurrence of melt fracture phenomena, including flow instabilities.
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