Composite Vibration Diaphragm Adhesion via Dual-Adhesive System
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Solution Overview
Problem
Conventional composite vibration diaphragms face issues with poor adhesion of reinforcing materials, leading to potential detachment during vibrations or environmental impacts, which compromises the acoustic properties of speakers.
Innovation Solution
A method involving the integration of reinforcing materials with a hot melt adhesive and thermosetting adhesive, where the reinforcing materials are first embedded in a gel-like hot melt adhesive and then mixed with a thermosetting adhesive, coated on a diaphragm, and cured in a baking process to ensure strong bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforcing material is mixed with thermosetting adhesive only, then the mixture can be applied and cured, but the reinforcing material exhibits poor adhesion and may drop from the diaphragm upon severe vibration or impact
Solution Approach 1:
The patent applies preliminary action by first mixing the reinforcing material with hot melt adhesive to form a pre-coated reinforcing material before combining it with the thermosetting adhesive mixture. This preliminary coating ensures that the reinforcing material is already bonded to the diaphragm surface before the final curing process, preventing detachment during vibration or impact.
Solution Approach 2:
The patent uses composite materials by combining hot melt adhesive and thermosetting adhesive in a dual-adhesive system. The hot melt adhesive provides immediate bonding to the reinforcing material, while the thermosetting adhesive provides structural strength and durability after curing, creating a composite adhesive system that overcomes the limitations of using either adhesive alone.
2Ease of manufacture
If reinforcing material is porous nano powder particles, then it can be mixed with adhesive, but it exhibits very poor adhesion to adhesive
Solution Approach 1:
The hot melt adhesive acts as an intermediary between the porous nano powder particles and the thermosetting adhesive. It first binds to the reinforcing material particles, creating a bridge that ensures strong adhesion, and then integrates with the thermosetting adhesive system, solving the poor adhesion problem of porous particles.
3Device complexity
If conventional single adhesive method is used, then the process is simple, but the reinforcing material may drop from the vibration diaphragm affecting acoustic properties
Solution Approach 1:
The patent applies preliminary action by first mixing the reinforcing material with hot melt adhesive to form a pre-coated reinforcing material before combining it with the thermosetting adhesive mixture. This preliminary coating ensures that the reinforcing material is already bonded to the diaphragm surface before the final curing process, preventing detachment during vibration or impact.
Solution Approach 2:
The patent uses composite materials by combining hot melt adhesive and thermosetting adhesive in a dual-adhesive system. The hot melt adhesive provides immediate bonding to the reinforcing material, while the thermosetting adhesive provides structural strength and durability after curing, creating a composite adhesive system that overcomes the limitations of using either adhesive alone.
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 effectively prevents the reinforcing materials from detaching, enhancing the strength and rigidity of the composite vibration diaphragm, thereby optimizing the acoustic performance of speakers.
Implementation Method 1
the internal hot melt adhesive that surrounds the reinforcing material will be melted and integrated with the thermosetting adhesive
Implementation Method 2
enabling the reinforcing material to be uniformly bonded to the vibration diaphragm
Implementation Method 3
the thermosetting adhesive will also be cured, enabling the reinforcing material to be uniformly bonded to the vibration diaphragm
Data Source
AI summary
A composite vibration diaphragm fabrication method includes the steps of: (a) mixing a reinforcing material with a hot melt adhesive to form a first mixture and to let the reinforcing material be wrapped in the hot melt adhesive uniformly, (b) mixing the first mixture with a thermosetting adhesive to form a second mixture, (c) coating the second mixture on a vibration diaphragm material and then heating the second mixture coated vibration diaphragm material, and (d) cooling down the coated vibration diaphragm material in which the second mixture is cured and bonded to the vibration diaphragm material. Thus, when baking the second mixture, the internal hot melt adhesive will be melted and integrated with the thermosetting adhesive, and the thermosetting adhesive will also be cured, enabling the reinforcing material to be uniformly bonded to the vibration diaphragm to reinforce the strength and rigidity of the composite vibration diaphragm.