Method for influencing a backflow length and / or a screw return speed, and injection molding machine

By metering plastic granules based on backflow length and screw return speed, the method addresses the limitations of existing control methods, improving melt quality and reducing torques in injection molding machines, ensuring consistent and high-quality plastic parts.

DE102020131424B4Undetermined Publication Date: 2026-06-25ENGEL AUSTRIA
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
ENGEL AUSTRIA
Filing Date
2020-11-27
Publication Date
2026-06-25

AI Technical Summary

Technical Problem

Existing methods for controlling the backflow length and screw return speed in plasticizing units of injection molding machines do not consider the backflow length parameter, leading to issues with high torques, component protection, melt quality, and consistency of injection-molded plastic parts, especially with residence time-critical plastic granules.

Method used

The method involves metering plastic granules based on desired backflow length and screw return speed, using under-feeding to adjust the backflow length and screw return speed in the plasticizing unit, allowing precise control of these parameters through sensors and a control device.

Benefits of technology

This approach reduces torques, improves melt quality, and enhances the consistency of injection-molded plastic parts by controlling residence time and minimizing material degradation, while maintaining stable processing conditions.

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Abstract

Method for influencing a backflow length (1) and / or a screw return speed (2) in an axially extending plasticizing cylinder (3) of a plasticizing unit (4) for an injection molding machine (15), with a plasticizing screw (6) displaceably and rotatably arranged in a cylinder bore (5) of the plasticizing cylinder (3), characterized in that a metering of plastic granules (7) supplied from the plasticizing unit (4) is carried out depending on the desired backflow length (1) in the plasticizing unit (4), wherein the plasticizing unit (4) is operated with underfeed, and wherein the backflow length (1) is determined via at least one sensor (9).
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