Waterproofing Backing Adhesive With Segmented Air Chambers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current waterproofing backing adhesives in electronic devices can form bubbles during assembly, which expand and contract, leading to gaps and potential water vapor leakage, especially in small devices like mobile phones, compromising the waterproof and dustproof IP standards.
Innovation Solution
A waterproofing backing adhesive structure with a backing adhesive main body featuring a plurality of air chambers, either formed by ribs or sockets, to accommodate and release pressure from bubbles, ensuring continuous adhesion and maintaining the waterproof function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the width of the backing adhesive is reduced to accommodate small device sizes, then the device becomes more compact and lightweight, but the adhesive becomes more susceptible to bubble expansion causing gaps and water vapor leakage
Solution Approach 1:
The backing adhesive is segmented into multiple regions by protruding ribs that extend from the first surface to the second surface. These ribs divide the adhesive into multiple compartments, preventing bubble expansion from creating continuous gaps. The segmentation maintains waterproof performance even in reduced-size devices by containing air bubbles within individual compartments rather than allowing them to form continuous leakage channels.
2Productivity
If bubbles are not fully expelled during adhesion, then the assembly process becomes faster and simpler, but bubbles expand and contract over time causing gaps and compromising waterproofing
Solution Approach 1:
The protruding ribs are pre-formed in the backing adhesive structure to provide air cushioning compartments before assembly occurs. These ribs create expansion spaces that accommodate bubbles that may form during or after assembly, preventing them from creating gaps between the adhesive and the first or second surfaces. This beforehand cushioning maintains waterproof reliability without requiring perfect bubble expulsion during assembly.
3Length of moving object
If the backing adhesive is made thinner to reduce device profile, then the device becomes more compact, but the adhesive has less capacity to accommodate expanding bubbles
Solution Approach 1:
The solution transitions from accommodating bubbles in the thickness dimension (which would require greater adhesive thickness) to accommodating bubbles in the lateral dimension through protruding ribs. The ribs create three-dimensional compartments within the adhesive layer, providing bubble accommodation capacity in a thin-profile adhesive by utilizing the width and depth dimensions created by the rib structures rather than requiring increased 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
Prevents the formation of gaps between the adhesive and the device components, maintaining the waterproof and dustproof integrity of electronic devices by allowing air from bubbles to enter air chambers, thus preventing water vapor ingress and ensuring the adhesive's effectiveness over time.
Implementation Method 1
the bubble will gradually expand and contract under air pressure due to expansion when it is hot, shrinkage when it is cold
Data Source
AI summary
A waterproofing backing adhesive structure is disclosed. The waterproofing backing adhesive structure is applied to an electronic device having a front cover and a display panel. The waterproofing backing adhesive structure includes an adhesive main body, an adhesive material, and a plurality of air chambers. The plurality of air chambers are formed on at least one of the surfaces of an upper surface or a bottom surface of the adhesive main body which is attached with the adhesive material for accommodating the air of a bubble generated when the adhesive main body is attached to the front cover or the display panel. The plurality of air chambers are for releasing the pressure of the bubble.