Liquid Ejecting Head Adhesive Layer Design
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Solution Overview
Problem
The adhesive force between substrates in liquid ejecting heads, particularly those made of resin, is compromised by components like sulfur and nitrogen in silicone-based adhesives, leading to reduced reliability due to inhibited curing and decreased bonding strength.
Innovation Solution
A configuration where a first substrate with a flow path is sealed by a second substrate made of resin, using a silicone-based adhesive layer and an additional epoxy-based adhesive layer to enhance bonding, with a third substrate adhering via a shared adhesive layer, and incorporating a curing acceleration catalyst like platinum and a co-catalyst layer of tantalum oxide to improve adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If silicone-based adhesives are used to bond the resin substrate, then ease of manufacture is improved, but adhesive force decreases due to catalyst poisoning by sulfur and nitrogen components
Solution Approach 1:
The adhesive system is segmented into two distinct layers: a lower silicone-based adhesive layer for ease of manufacturing and bonding, and an upper epoxy-based adhesive layer for high strength and reliability. This segmentation allows each layer to perform its specialized function without interference, resolving the contradiction between ease of manufacture and adhesive force.
Solution Approach 2:
The invention uses a composite adhesive structure combining silicone-based adhesive and epoxy-based adhesive in a layered configuration. This composite approach leverages the advantages of both materials: the silicone layer provides easy application and bonding, while the epoxy layer provides high strength and resistance to catalyst poisoning, thereby achieving both ease of manufacture and high adhesive force.
2Device complexity
If a single adhesive layer is used, then device complexity is reduced, but adhesive force decreases due to catalyst poisoning
Solution Approach 1:
The adhesive system is segmented into two distinct layers: a lower silicone-based adhesive layer for ease of manufacture and bonding, and an upper epoxy-based adhesive layer for high strength and reliability. This segmentation allows each layer to perform its specialized function without interference, resolving the contradiction between ease of manufacture and adhesive force.
Solution Approach 2:
The invention uses a composite adhesive structure combining silicone-based adhesive and epoxy-based adhesive in a layered configuration. This composite approach leverages the advantages of both materials: the silicone layer provides easy application and bonding, while the epoxy layer provides high strength and resistance to catalyst poisoning, thereby achieving both ease of manufacture and high adhesive force.
3Ease of manufacture
If resin substrates are used, then ease of manufacture is improved, but adhesive force decreases due to components acting as catalyst poison
Solution Approach 1:
The epoxy-based adhesive layer acts as an intermediary between the resin substrate and the external environment. It provides a protective barrier that prevents harmful components (sulfur and nitrogen) from the resin substrate from reaching and poisoning the catalyst in the silicone-based adhesive layer, thereby maintaining bonding strength while allowing the use of easy-to-manufacture resin substrates.
Solution Approach 2:
The invention uses a composite adhesive structure combining silicone-based adhesive and epoxy-based adhesive in a layered configuration. This composite approach leverages the advantages of both materials: the silicone layer provides easy application and bonding, while the epoxy layer provides high strength and resistance to catalyst poisoning, thereby achieving both ease of manufacture and high adhesive force.
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 configuration increases the reliability of the liquid ejecting head by maintaining adhesive force, preventing peeling, and enhancing the bonding strength between substrates, even under shear stress and linear expansion differences.
Implementation Method 1
the first substrate and the second substrate adhere to each other via a first adhesive layer which is laminated on the surface on the one side of the first substrate and which is made of a silicone-based adhesive and a second adhesive layer which is laminated on the first adhesive layer and which is made of an epoxy-based adhesive
Implementation Method 2
incorporating a curing acceleration catalyst like platinum and a co-catalyst layer of tantalum oxide to improve adhesion
Data Source
AI summary
Provided is a liquid ejecting head including: a first substrate in which a space serving as a flow path is formed in a state of having an opening on a surface of one side thereof; and a second substrate which seals the opening from the surface on the one side of the first substrate, divides the flow path, and is made of resin, in which the first substrate and the second substrate adhere to each other via a first adhesive layer which is laminated on the surface on the one side of the first substrate and which is made of a silicone-based adhesive and a second adhesive layer which is laminated on the first adhesive layer and which is made of an epoxy-based adhesive.