Adhesive Sealing Sequence to Prevent Smartphone Panel Squeeze-Out
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Solution Overview
Problem
Conventional sealing methods for smartphones using adhesives between housings and touch panels require spacers to maintain adhesive thickness, which reduces adhesion strength and can cause stress to the touch panel, and often result in adhesive being squeezed outside the housing, thickening it unnecessarily.
Innovation Solution
A sealing method involving dispensing an adhesive on the edge surface, hardening it to a predetermined state before assembly, and then triggering adhesion strength, allowing for wider adhesion without spacers or channels, thus maintaining adequate adhesive thickness and preventing adhesive squeeze-out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If spacers are provided on the edge surface to maintain adhesive thickness, then adhesive layer thickness is maintained, but adhesion width is reduced and adhesion strength is weakened
Solution Approach 1:
The adhesive is activated to a predetermined hardness before assembly, allowing it to maintain its thickness without requiring spacers. This preliminary hardening action enables the adhesive to support itself during the assembly process, eliminating the need for thickness-maintaining structures that would reduce adhesion width.
Solution Approach 2:
The adhesive undergoes a parameter change from soft to hardened state through activation before assembly. This change in physical state allows the adhesive to maintain its shape and thickness without external support, resolving the contradiction between maintaining thickness and maximizing adhesion width.
2Strength
If pressure is applied to bond the housing and touch panel, then bonding is achieved, but adhesive is squeezed outside the housing and thickness is increased
Solution Approach 1:
The adhesive is activated to a predetermined hardness before assembly, so that when pressure is applied during bonding, the hardened adhesive resists being squeezed out while still allowing proper bonding. This preliminary hardening prevents excessive adhesive extrusion and maintains the housing thickness.
3Manufacturing precision
If spacers are provided on the edge surface, then adhesive thickness is maintained, but stress is concentrated on the touch panel glass causing potential cracking
Solution Approach 1:
The spacers are completely removed from the system by using a different approach - activating the adhesive before assembly. This extraction of the problematic spacer element eliminates the stress concentration issue on the touch panel while still maintaining adequate adhesive thickness through the preliminary activation of the adhesive itself.
4Object-generated harmful factors
If channels are provided next to the edge surface to collect squeezed adhesive, then adhesive overflow is prevented, but housing thickness is increased
Solution Approach 1:
The channels are removed from the design by preventing adhesive squeeze-out at its source through preliminary activation. The adhesive is hardened to a predetermined hardness before assembly, so that when bonding pressure is applied, the adhesive maintains its shape and does not require channels to contain overflow, thereby eliminating the need for additional housing thickness.
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 enhances adhesion strength and waterproof reliability by maintaining a wider adhesive width without spacers or channels, reducing the thickness of the housing and preventing adhesive squeeze-out, while ensuring reliable bonding and reduced stress on the touch panel.
Implementation Method 1
performing a first activation for hardening the adhesive to a predetermined hardness
Implementation Method 2
performing a second activation for triggering appearance of adhesion strength of the adhesive
Data Source
AI summary
A sealing method includes dispensing an adhesive on an edge surface of a first part, performing a first activation for hardening the adhesive to a predetermined hardness, performing a second activation for triggering appearance of adhesion strength of the adhesive, assembling the first part and a second part, and pressing the first part and the second part against each other.