Liquid Ejecting Head Adhesive Chelate Compound Bonding
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Solution Overview
Problem
In liquid ejecting heads, the bonding interface between metal flow path members can lead to metal ion elution into the flow path, reducing bonding strength and causing interfacial peeling.
Innovation Solution
A liquid ejecting head is designed with a nozzle, a first flow path member, a second metal flow path member, and an adhesive containing a water-insoluble chelate compound to bond these members, which suppresses metal ion elution and enhances bonding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal flow path member is bonded to a flow path member with an adhesive, then the bonding strength is initially sufficient, but metal ions are eluted into the liquid in the flow path over time, which decreases the bonding strength and causes interfacial peeling
Solution Approach 1:
A primer layer is introduced as an intermediary between the metal flow path member and the adhesive. The primer prevents metal ion elution from the metal surface into the liquid while maintaining bonding strength. The primer acts as a barrier layer that blocks the harmful interaction between the metal and the liquid without compromising the adhesive bonding.
Solution Approach 2:
The bonding structure is transformed from a simple metal-adhesive interface into a composite structure consisting of metal flow path member + primer layer + adhesive + flow path member. This composite structure combines the advantages of each layer: the metal provides structural integrity, the primer prevents ion elution, and the adhesive provides bonding strength.
2Ease of manufacture
If an adhesive is used to bond metal flow path members, then the assembly is easy to manufacture, but the bonding interface comes into contact with liquid and metal ions are eluted, reducing bonding strength
Solution Approach 1:
The primer serves as a thin intermediary layer that does not significantly complicate the manufacturing process while effectively preventing metal ion elution. The primer can be applied as a thin coating that cures quickly, maintaining the ease of manufacture while solving the bonding strength degradation problem.
Solution Approach 2:
The chemical composition of the bonding interface is changed by introducing the primer layer, which has different chemical properties than the metal or adhesive alone. This parameter change in the interface composition prevents metal ion elution while maintaining or enhancing bonding strength.
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 use of a water-insoluble chelate compound in the adhesive reduces metal ion elution and maintains bonding stability over time, improving the reliability of the bonding strength and preventing interfacial peeling.
Implementation Method 1
The adhesive contains a water-insoluble chelate compound... suppresses metal ion elution... improving the reliability of the bonding strength
Data Source
AI summary
A liquid ejecting head includes a nozzle configured to eject a liquid, a first flow path member that defines a portion of a flow path for supplying the liquid to the nozzle, a second flow path member that is bonded to the first flow path member to define a portion of the flow path and that is formed of a metal, and an adhesive that bonds the first flow path member and the second flow path member. The adhesive contains a water-insoluble chelate compound.