Inkjet Head Silane Coupling Agent Bonding
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Solution Overview
Problem
Inkjet recording apparatuses experience deterioration and separation of fixed portions between components due to temperature differences between ink passages and outer portions, leading to physical distortion and reduced performance during ink ejection.
Innovation Solution
An inkjet head design featuring a head chip, a wiring substrate, and a protective film, where a silane coupling agent is used in the adhesive to enhance bonding between these components, and internal heaters circulate heated ink to promote chemical bonding and reduce separation, ensuring stable fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the inkjet head heats the ink to a predetermined temperature for efficient ejection, then the ink ejection efficiency is improved, but the temperature difference between ink passages and outer portions causes physical distortion and deterioration of fixed portions
Solution Approach 1:
The adhesive is changed from a conventional single-cure-type adhesive to a dual-cure type adhesive that can be cured by both light irradiation and heating. This parameter change in the adhesive's curing mechanism allows it to maintain stability under temperature differences caused by ink heating, resolving the contradiction between ink ejection efficiency and fixed portion stability
Solution Approach 2:
The invention uses a composite curing approach combining light-curable and heat-curable properties in the adhesive. This composite material strategy enables the adhesive to form strong bonds that resist the physical distortion caused by temperature gradients during ink heating, while still allowing efficient ink ejection
2Temperature
If the inkjet head operates at elevated temperatures for phase transition ink ejection, then the viscosity of the ink is reduced and ejection is improved, but the fixed portions between components deteriorate and separate
Solution Approach 1:
The adhesive's curing characteristics are changed to include both light-curable and heat-curable properties. This allows the adhesive to be initially set by light curing and then further strengthened by heat curing during inkjet head operation, maintaining bonding strength at elevated temperatures required for phase transition ink ejection
Solution Approach 2:
The adhesive is first cured by light irradiation before the inkjet head operates at elevated temperatures. This preliminary curing action provides initial bond strength, and the subsequent heat exposure during operation further cures the adhesive, preventing deterioration and separation at high temperatures
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 solution effectively prevents separation of fixed portions between the head chip and the wiring substrate and protective film, maintaining inkjet head performance even when ejecting ink at elevated temperatures, thereby enhancing the overall reliability and longevity of the inkjet recording apparatus.
Implementation Method 1
a silane coupling agent is disposed at an interface between the head chip and the wiring substrate and at an interface between the head chip and the protective film
Implementation Method 2
circulation of the heated ink promotes a chemical reaction of the silane coupling agent
Implementation Method 3
ejecting ink which is heated to a predetermined temperature
Data Source
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AI summary
The problem of the present invention is to provide an ink jet head with which it is possible to suppress the occurrence of separation in a fastened part between a first member and a second member fastened to the first member when an ink heated to a prescribed temperature is discharged. The ink jet head is an ink jet head of an ink jet recording device for discharging an ink heated to a prescribed temperature, and is characterized in being provided with a first member and a second member fastened to the first member, with a silane coupling agent interposed the interface between the first and the second members.