Hot Runner Nozzle Funnel Section for Striped Pattern Injection Molding
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Solution Overview
Problem
Existing hot runner nozzles for injection molding struggle to evenly distribute multiple types of molten resins, leading to uneven distribution and color mixing issues when forming striped patterns in molded products, which prevents the simultaneous production of striped molded products with the desired pattern.
Innovation Solution
A hot runner nozzle design featuring a first resin flow path with a funnel section and multiple second resin flow paths, each with discharge ports around the centripetal position, allowing for precise merging and distribution of molten resins into the nozzle gate, which is then fed into the metal mold cavity, along with a shut pin for controlling the nozzle gate, ensuring consistent striped patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a hot runner nozzle with separate resin flow paths for multiple types of molten resins is used, then the ability to form striped patterns is improved, but uneven distribution of molten resins occurs leading to color mixing
Solution Approach 1:
The hot runner nozzle is divided into multiple independent resin flow paths (first resin flow path and second resin flow paths) that are spatially separated throughout the flow path and only merge at the nozzle gate. This segmentation prevents premature mixing of different colored resins while maintaining the ability to form striped patterns, resolving the contradiction between pattern formation capability and distribution uniformity.
Solution Approach 2:
Different sections of the hot runner nozzle have different functional characteristics: the first resin flow path has a larger cross-sectional area for gathering resin, while the second resin flow paths have smaller cross-sectional areas for precise resin supply. The merge region at the nozzle gate is specifically designed to maintain separate flow streams until the last moment, ensuring both pattern formation and uniform distribution.
2Ease of manufacture
If multiple types of molten resins are fed through separate resin flow paths, then striped patterns can be formed, but the resin flow is affected by runner bends causing uneven distribution
Solution Approach 1:
The resin flow paths are segmented into distinct first and second paths that maintain spatial separation through the runner system. This segmentation isolates the resin flows from each other, preventing the flow instability caused by bends from affecting the mixing ratio, while still allowing both resins to reach the gate for pattern formation.
Solution Approach 2:
The separate resin flow paths act as intermediary channels that protect the resin flows from each other during transport through the runner system. This intermediary structure allows the resins to be transported independently without mutual interference, maintaining flow consistency despite runner bends.
3Device complexity
If a conventional hot runner nozzle structure is used, then the structure is simple, but it cannot achieve consistent striped patterns due to resin mixing
Solution Approach 1:
The nozzle structure is segmented into a first resin flow path and multiple second resin flow paths that are spatially separated. This segmentation adds some structural complexity but enables precise control over resin flow and mixing, achieving consistent striped patterns that outweigh the increased structural complexity.
Solution Approach 2:
The resin flow paths are arranged in different spatial dimensions and orientations, with the first resin flow path and second resin flow paths separated in space. This dimensional separation allows independent flow control while maintaining a relatively compact nozzle structure, achieving pattern consistency without excessive complexity.
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 ensures that multiple types of molten resins are evenly merged and fed into the mold, allowing for the production of striped molded products with consistent patterns, enabling the creation of novel designs and varied striped patterns by adjusting injection conditions.
Implementation Method 1
a first resin flow path and a plurality of second resin flow paths, each of the second resin flow paths having a discharge port facing and communicating with the funnel section, the discharge ports being disposed around the centripetal position
Data Source
AI summary
When a plurality of striped molded products are molded at a time, the molded products having a striped pattern and an outstanding design property are obtained by preventing part of molten resins from being unevenly distributed in an inappropriate manner when being fed into a cavity of a metal mold. A hot runner nozzle is provided with a first resin flow path and a plurality of second resin flow paths. The first flow path has a funnel section which continues with a nozzle gate at a centripetal position and which allows a first molten resin to be gathered at the centripetal position of the funnel section so as to feed the resin into the nozzle gate. The second resin flow paths have a plurality of corresponding discharge ports facing and communicating with the funnel section of the first resin flow path, each of the discharge ports being disposed around the centripetal position, so that the second molten resin different from the first molten resin is fed into the funnel section.