Single Level Manifold Melt Splitter for Injection Molding
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Solution Overview
Problem
Conventional injection molding systems face challenges in maintaining consistent melt stream temperature and shear history across cavities due to shear heating, leading to temperature differentials and imbalances in melt distribution, which affect the uniformity and quality of molded parts.
Innovation Solution
A single-level manifold with a melt splitter is introduced, where the upstream melt channel intersects with downstream channels in the same plane, dividing the melt stream into substantially equal volumes through trough-like recesses, ensuring each downstream channel receives an equal share of the melt stream, thereby minimizing shear heating and temperature differentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional multi-level manifold designs are used, then the melt stream can be directed to multiple cavities, but temperature differentials and shear heating cause imbalances in melt distribution between cavities
Solution Approach 1:
The manifold is divided into multiple independent melt channels, each with its own heater zone and flow control mechanism. This segmentation allows independent temperature and flow control for each cavity, eliminating the temperature differentials and shear heating imbalances that occur in conventional multi-level designs where melt flows through multiple levels and intersections.
Solution Approach 2:
The patent transitions from a conventional multi-level three-dimensional manifold structure to a single-level planar structure. By flattening the manifold into one level with all channels lying in the same plane, the design eliminates vertical level changes and complex three-dimensional intersections that cause shear heating and temperature differentials, while still achieving multi-cavity distribution through careful two-dimensional channel layout.
2Device complexity
If geometrically matching runner layouts are used, then the manifold structure is simplified, but shear heating at turns and level changes still causes melt stream imbalance
Solution Approach 1:
The manifold channels are segmented into straight sections separated by gentle curved transitions rather than sharp turns. Each channel is designed as a separate flow path with controlled geometry, allowing the structure to remain simple while eliminating the shear heating problems caused by abrupt directional changes in conventional designs.
Solution Approach 2:
By confining all melt channels to a single planar level, the design eliminates the need for complex three-dimensional level changes and vertical transitions. The channels are arranged in two dimensions with smooth curved connections, maintaining structural simplicity while preventing the shear heating that occurs at sharp turns and level changes in multi-level systems.
3Adaptability or versatility
If multiple level changes are incorporated in melt channels, then cavity distribution is achieved, but manufacturing complexity and potential for imbalance increase
Solution Approach 1:
The patent achieves multi-cavity distribution by arranging all melt channels in a single planar level rather than using multiple vertical levels. The channels are configured in two dimensions with various routing patterns (linear, radial, serpentine) to accommodate different cavity arrangements, eliminating the need for complex three-dimensional level changes while maintaining full cavity distribution capability and simplifying manufacturing.
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 design enhances the consistency and uniformity of the melt stream distribution, resulting in improved part-to-part consistency and reduced manufacturing complexity and energy efficiency by simplifying the manifold structure and reducing manufacturing steps.
Implementation Method 1
the melt stream experiences shear in the area adjacent to the bore or melt channel wall with a corresponding localized elevation of the temperature
Data Source
AI summary
An injection molding apparatus is disclosed having a single level manifold that utilizes a melt splitter. The manifold defines an inlet and a plurality of outlets with at least one upstream melt channel and a plurality of downstream melt channels that are situated between the inlet and the plurality of outlets. The upstream melt channel branches into the plurality of downstream melt channels with the upstream melt channel and each of the downstream melt channels longitudinally extending in the same plane. The melt splitter is at least partially positioned within the upstream melt channel where the upstream melt channel intersects with the plurality of downstream melt channels. The melt splitter divides a melt flow received from the upstream melt channel into substantially equal volumes and then directs each of the substantially equal volumes into a respective one of the plurality of downstream melt channels.