Double-Sided Adhesive Tape for Ceramic Capacitor Lamination
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Solution Overview
Problem
In the process of manufacturing ceramic capacitors, the warp in green sheet laminates leads to peeling issues due to low pressure-sensitive adhesive strength, and conventional strongly adhesive tapes cause lateral displacement during lamination, affecting electrode accuracy.
Innovation Solution
A double-sided pressure-sensitive adhesive tape with a heat-releasable adhesive layer and a temporarily fixing adhesive layer, characterized by a tensile strength of 2.0 to 20 N/20 mm and an amount of displacement of 0.3 mm/20 mm or less, crosslinked with isocyanate or epoxy agents, is used to maintain adherend fixation and prevent lateral displacement during processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a strongly adhesive pressure-sensitive adhesive is used to suppress peeling caused by warp stress, then the adhesive strength is improved, but lateral displacement occurs during pressurization
Solution Approach 1:
The pressure-sensitive adhesive tape is divided into two distinct layers: a first pressure-sensitive adhesive layer for temporary fixing with moderate strength, and a second pressure-sensitive adhesive layer for strong adhesion to suppress warp stress. This segmentation allows each layer to perform its specific function without causing lateral displacement, resolving the contradiction between adhesive strength and manufacturing precision.
Solution Approach 2:
Different regions of the adhesive tape have different adhesive properties tailored to specific needs. The first layer provides localized temporary fixing with controlled strength to prevent displacement, while the second layer provides localized strong adhesion to counteract warp stress. This local differentiation of adhesive quality resolves the contradiction between preventing displacement and suppressing peeling.
2Reliability
If a pressure-sensitive adhesive tape is used to fix green sheets during lamination, then the green sheets can be held in position, but the tape itself may undergo lateral displacement under continuous pressing pressure
Solution Approach 1:
The adhesive tape is segmented into two layers with different functional properties. The first layer is specifically designed with moderate adhesive strength and low displacement characteristics to maintain positional stability during pressurization, while the second layer provides strong adhesion for overall fixation reliability. This segmentation resolves the contradiction between fixation stability and processing accuracy.
Solution Approach 2:
The first pressure-sensitive adhesive layer is applied first to provide preliminary temporary fixing with controlled displacement, creating a stable base before the second layer is applied. This preliminary action prevents lateral displacement during subsequent pressurization steps, ensuring processing accuracy while maintaining fixation stability.
3Strength
If conventional pressure-sensitive adhesive tapes are used, then they can provide adequate adhesion, but they cannot be easily released without damage after processing
Solution Approach 1:
The second pressure-sensitive adhesive layer is designed with temperature-dependent adhesive strength characteristics. At room temperature, it provides strong adhesion to suppress warp stress. When heated to 80°C or higher, its adhesive strength decreases, enabling easy release of the processed product. This parameter change with temperature resolves the contradiction between adhesive strength and release ease.
Solution Approach 2:
The second adhesive layer undergoes a phase transition in its adhesive properties when heated. The thermal energy causes a change in the adhesive's molecular structure or bonding characteristics, reducing its adhesive strength from a strong state during processing to a weak state for easy release. This phase transition resolves the contradiction between maintaining strong adhesion during processing and enabling easy release afterward.
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 suppresses warp-induced stress and prevents lateral displacement, ensuring accurate processing and easy release of the processed article without damage by heating.
Implementation Method 1
a heat-releasable pressure-sensitive adhesive layer containing a heat-expandable microsphere
Implementation Method 2
the pressure-sensitive adhesive layer for temporary fixing is crosslinked with an isocyanate or epoxy crosslinking agent
Data Source
AI summary
The present invention relates to a double-sided pressure-sensitive adhesive tape or sheet, containing a heat-releasable pressure-sensitive adhesive layer containing a heat-expandable microsphere on one side of a substrate, and a pressure-sensitive adhesive layer for temporary fixing on another side of the substrate, in which the pressure-sensitive adhesive layer for temporary fixing has a tensile pressure-sensitive adhesive strength of 2.0 to 20 N/20 mm in width and an amount of displacement of 0.3 mm/20 mm in width or less, and the pressure-sensitive adhesive layer for temporary fixing is crosslinked with an isocyanate or epoxy crosslinking agent.