Floating Core Insert for Glass Insert Molding
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Solution Overview
Problem
Insert molding processes for plastic parts with metal components often result in thick, unsuitable parts due to undesirable plastic termination lines, which are not suitable for modern electronic devices demanding smaller and thinner designs, and suffer from issues like warping, gaps, and unsightly cosmetic edges.
Innovation Solution
A pressure-reinforced floating core insert is used in the insert molding process, allowing the glass substrate to be seated within the cavity and ensuring the polymeric material only attaches to the minor faces, eliminating gaps and unsightly edges, and enabling thinner, sleeker designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If conventional insert molding process is used, then complex shapes can be formed, but the parts become thick with problematic plastic termination lines
Solution Approach 1:
The mold is segmented into multiple cavities allowing different regions to be molded separately. The glass substrate is positioned in a first cavity while the overmold is formed in a second cavity, enabling precise control over where plastic material is applied and eliminating unwanted plastic termination lines on the front surface.
Solution Approach 2:
The molding process applies different qualities to different regions: the front surface (first cavity) receives no plastic material to maintain glass clarity and cosmetic quality, while the back surface (second cavity) receives the overmold for structural support and functionality. This local differentiation resolves the termination line issue.
2Adaptability or versatility
If conventional insert molding process is used, then metal components can be integrated, but the parts are thick and unsuitable for modern electronic devices
Solution Approach 1:
The molding process is divided into two separate cavity operations: the glass substrate with metal components is formed in the first cavity, then the overmold is applied only to the back surface in the second cavity. This segmentation eliminates unnecessary plastic buildup on the front while maintaining component integration on the back, reducing overall part thickness.
Solution Approach 2:
The plastic overmold is applied only in the backward direction (second cavity) rather than enclosing the glass substrate on all sides. This dimensional approach allows metal components to be integrated while avoiding plastic material on the front surface, achieving thinner profiles suitable for modern electronics.
3Strength
If glass substrate is molded conventionally, then structural integrity can be achieved, but warping and gaps occur
Solution Approach 1:
The molding process separates glass substrate formation (first cavity) from overmold application (second cavity). This ensures the glass substrate achieves proper structural integrity in the first cavity without interference, then the overmold is precisely applied to the back surface in the second cavity, preventing gaps and warping at the interface.
Solution Approach 2:
The glass substrate is first formed with proper structural integrity in the first cavity before the overmold is applied. This preliminary formation ensures the substrate is stable and properly positioned, preventing subsequent warping and gaps when the overmold is added in the second cavity.
4Object-affected harmful factors
If plastic material is applied to cover glass substrate, then protection can be provided, but unsightly cosmetic edges and flash are created
Solution Approach 1:
The mold is divided into two cavities: the first cavity forms the glass substrate without plastic material to preserve cosmetic edge quality, while the second cavity applies the overmold only to the back surface for protection. This segmentation eliminates flash and unsightly edges on the front surface while providing necessary protection on the back.
Solution Approach 2:
Plastic overmold material is applied locally only to the back surface (second cavity) where protection is needed, while the front surface (first cavity) remains free of plastic material to maintain cosmetic quality. This local application eliminates flash and unsightly edges on visible surfaces.
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 results in flash-free and step-free major faces, preventing warping and ensuring reliability by eliminating gaps and cosmetic issues, allowing for the production of thinner and more suitable electronic device components.
Implementation Method 1
a floating core insert is placed in the cavity to apply a preloading force against a first major face of the glass layer to hold the glass layer in place
Implementation Method 2
polymeric material is introduced into the cavity by injection
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.