Strand Manufacturing Device with Gradient Flow Passage
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Solution Overview
Problem
The variation in outer diameter of strands manufactured using a die with multiple through holes leads to inconsistent weight of pellets, causing measurement failures and molding issues in thermoplastic resin products.
Innovation Solution
A strand manufacturing device with a flow passage member that includes an outflow port, an inflow port, a manifold section, and a slit section, where the slit section's dimension decreases gradually and the manifold section's cross-section decreases as distance from the inflow port increases, optimizing flow resistance and flow rate uniformity across all through holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a die with multiple through holes is used to manufacture strands collectively, then productivity is improved, but variation in outer diameter of strands increases
Solution Approach 1:
The flow passage member is designed with non-uniform thickness: the first region (near the inflow port) has a larger thickness than the second region (near the through holes). This local variation in geometry compensates for the different flow path lengths, ensuring uniform flow rates and outer diameters across all through holes while maintaining high productivity through collective strand manufacturing
2Ease of manufacture
If the flow passage has constant thickness, then ease of manufacture is improved, but flow rate uniformity across through holes deteriorates
Solution Approach 1:
The flow passage member incorporates a thickness gradient where the first region has greater thickness than the second region. This local geometric variation is designed to balance flow resistance across different paths, achieving uniform flow rates to all through holes while remaining manufacturable through standard machining or molding processes
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
This configuration reduces the variation in outer diameter of strands and pellets, ensuring consistent weight and size, thereby preventing molding failures.
Implementation Method 1
a flow passage member 19 that defines a flow passage 18 for supplying resin raw material 2 in a molten state to the plurality of through holes 20
Data Source
AI summary
A dimension in a Y-direction of a slit section (26) decreases gradually as a distance from an inflow port (23) in an X-direction increases. A cross-section of a manifold section (25) that is orthogonal to the X-direction decreases gradually as a distance from the inflow port (23) in the X-direction increases.