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

Application Number
DE102020131424P0
Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
Priority Date
2019-11-28
Filing Date
2020-11-27
Publication Date
2026-06-25
Estimated Expiration
2040-11-27

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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Citation Information

Patent Citations

  • Method for forming a double embossing structure

    US20110215469A1

  • Injection molding machine has casting resin supply amount adjuster that is provided to reduce amount of casting resin supply from casting resin material feeding unit, when screw resistor value is larger

    DE102013012067A1

  • Process for influencing the melt temperature in the plasticizing cylinder of a plasticizing unit

    DE102015010245A1

  • Injection molding compounder, method and program product

    EP2814654B1

  • Injection molding method

    US20110215496A1