Floating Core Insert for Glass Overmolding Precision
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Solution Overview
Problem
Insert molding processes for electronic components often result in thick, unsuitable plastic parts with undesirable termination lines and issues like warping, gaps, and unsightly cosmetic edges, which are problematic for modern electronic devices demanding thinner and sleeker designs.
Innovation Solution
The use of a pressure-reinforced floating core insert in the molding process, where the polymeric material is injected through a runner plate wider than the core block, applying pressure to a glass or other substrate layer to eliminate flash and steps on major faces, ensuring a seamless and thin finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If insert molding is used to form complex shapes with dimensional control, then manufacturing precision is improved, but the plastic parts become thick with problematic termination lines and unsuitable for modern electronic devices
Solution Approach 1:
The mold is segmented into multiple cavities allowing simultaneous formation of multiple parts or variations, enabling precise dimensional control while optimizing part thickness for modern electronic device requirements
Solution Approach 2:
The patent introduces a floating core insert mechanism that operates in a separate dimensional space within the mold cavity, allowing dynamic adjustment of plastic flow and pressure distribution to achieve optimal thickness profiles while maintaining complex shape precision
2Shape
If conventional insert molding is used, then complex shapes can be formed, but gaps and unsightly cosmetic lines appear at the interface between polymer overmold and substrate
Solution Approach 1:
A floating core insert is pre-positioned in the mold cavity before polymer injection, creating a preliminary structural framework that guides plastic flow and prevents gap formation at the interface between the overmold and substrate
Solution Approach 2:
The floating core insert acts as an intermediary element between the polymer material and the substrate, mediating the interface formation process to eliminate gaps and cosmetic defects while preserving complex shape capabilities
3Adaptability or versatility
If plastic parts are made thinner for modern electronic devices, then adaptability to modern electronics is improved, but warping and structural integrity issues may occur
Solution Approach 1:
The patent modifies critical parameters including mold temperature distribution, injection pressure profiles, and cooling rates to achieve optimal thin-walled part formation that maintains structural integrity and resists warping while meeting modern electronic device thickness requirements
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 method eliminates gaps and unsightly cosmetic lines, allows for thinner electronic device designs, and prevents water, dust, and debris ingress by ensuring a secure, flash-free interface between the polymer overmold and the glass substrate.
Implementation Method 1
the polymeric material in the runner provides a loading force to a glass layer disposed in the cavity. Accordingly, this results in pressure pushing downward on the glass layer. The pressure closes any gaps or space between the floating core insert and the glass layer
Data Source
AI summary
A tool (1000) includes a mold defining a cavity (1002). The cavity can be for receiving a glass layer (402). A floating core insert (1001) can be placed in the cavity to apply a preloading force against a first major face of the glass layer, preclude an overmolding operation on the first major face, and allow overmolding only on minor faces of the glass layer when polymeric material (1100) is injected into runners (1018,1019,1020) of the tool.