TPU Waterproof Tape with Light-Blocking Film for Mobile Terminals
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Solution Overview
Problem
Current waterproof adhesives in mobile terminals fail to effectively seal micro interstices, leading to water penetration and light leakage, which compromises the waterproof and light-tightness of these devices.
Innovation Solution
A waterproof tape comprising a thermoplastic polyurethane (TPU) film with a laminated light-blocking film containing carbon black and an attachment layer of adhesive or cohesive polymer resin, which provides both water resistance and light-blocking properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive tape is used to seal micro interstices, then components can be bonded together, but water penetrates through the adhesive tape and light leaks out
Solution Approach 1:
The patent uses a composite structure consisting of a waterproof film layer (providing water resistance) and a light-blocking film layer (providing light tightness) bonded together. This composite material approach allows the tape to simultaneously achieve waterproofing and light-blocking functions that a single material cannot provide, resolving the contradiction between bonding strength and waterproof reliability.
Solution Approach 2:
The waterproof tape is divided into distinct functional layers: a waterproof film layer for water resistance, a light-blocking film layer for light tightness, and an attachment layer for bonding. This segmentation allows each layer to optimize its specific function independently, ensuring both waterproofing and light-blocking performance while maintaining bonding capability.
2Ease of manufacture
If adhesive tape is used for sealing, then components can be attached, but micro interstices remain unsealed allowing water penetration
Solution Approach 1:
The patent employs a flexible waterproof film made of thermoplastic polyurethane (TPU) that can conform to the surface being sealed while providing effective water resistance. This thin film structure maintains ease of attachment and manufacturing while effectively blocking water penetration through micro interstices, resolving the contradiction between ease of manufacture and water penetration prevention.
3Object-affected harmful factors
If a light-blocking film is added to prevent light leakage, then light-tightness is improved, but the tape structure becomes more complex
Solution Approach 1:
The patent combines the waterproof film and light-blocking film into a single integrated tape structure where both functions are achieved within one compound material system. This merging approach prevents light leakage while avoiding the need for separate, complex assembly of multiple independent components, thus resolving the contradiction between light-tightness improvement and structural complexity.
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 tape effectively prevents water and light from entering mobile terminals, enhancing their waterproof and light-tightness while maintaining a slim profile and providing a certain level of shock absorption.
Implementation Method 1
a waterproof film that contains extruded or cast thermoplastic polyurethane (TPU)
Implementation Method 2
a light-blocking film that is laminated on the waterproof film and contains a colored substance. The colored substance may include carbon black.
Data Source
AI summary
There is provided a waterproof tape for preventing leakage of light including: a waterproof film that contains extruded or cast thermoplastic polyurethane (TPU); and a light-blocking film that is laminated on the waterproof film and contains a colored substance.