Extrusion Die Radial Heat Insulation for Nozzle Clogging
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Solution Overview
Problem
The phenomenon of molten resin solidifying in nozzle holes inside a die during the extrusion process leads to clogging, which affects the performance and strength of the die and the quality of the pellets produced.
Innovation Solution
A die with a heat insulating layer composed of cavities that extend radially from the outer to the inner side of the die, combined with a specific cross-sectional shape for the heat insulating portions to enhance insulation while maintaining mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the heat insulating layer provided inside the die is large, then the effect of suppressing the phenomenon in which the resin solidifies in the nozzle hole is improved, but the strength of the die is reduced
Solution Approach 1:
The heat insulating layer is divided into multiple heat insulating portions arranged in a specific pattern (radially from outer peripheral side toward inner side). This segmentation allows the insulation function to be distributed across multiple smaller elements rather than requiring a single large continuous layer, thereby maintaining die strength while achieving sufficient thermal insulation to prevent resin solidification in nozzle holes
Solution Approach 2:
The heat insulating portions are strategically positioned to provide localized thermal insulation where most needed (near the nozzle holes and injection hole) rather than uniformly throughout the entire die. This allows effective clogging prevention in critical areas while minimizing the overall heat insulating layer volume to preserve die strength
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents clogging in the nozzles, ensures uniform pellet size, and improves the performance of the die and extrusion apparatus, resulting in higher-quality pellets.
Implementation Method 1
a plurality of first heat insulating portions provided inside the first member. The plurality of first heat insulating portions extend from an outer peripheral side of the first member toward an inner side of the first member in plan view
Data Source
AI summary
A die 6 includes a central member 6a, an injection hole formed from a surface of the central member 6a to an inside, a plurality of nozzles formed from an opposite surface of the central member 6a to the inside and connected to the injection hole, a heat source provided inside the central member 6a, and a plurality of heat insulating portions 31a provided inside the central member 6a. The plurality of heat insulating portions 31a extend from an outer peripheral side of the central member 6a toward an inner side of the central member 6a in plan view.