Curable Processing Sheet for Easy Workpiece Separation After Heating
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Solution Overview
Problem
Existing sheets for workpiece processing face challenges in separating workpieces after heating treatment due to increased adhesive strength, which hinders efficient processing and dicing.
Innovation Solution
A sheet for workpiece processing is developed with a pressure sensitive adhesive layer composed of an active energy ray-curable pressure sensitive adhesive containing a hindered amine-based stabilizer, allowing for reduced adhesive strength after heating and facilitating easy separation of workpieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional pressure sensitive adhesive layer is used, then the sheet provides adequate adhesive strength for workpiece processing, but the adhesive strength increases excessively after heating treatment, making separation difficult
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition of the pressure sensitive adhesive to include a specific gel fraction range (5-60%) after heating treatment. This parameter control ensures that the adhesive maintains sufficient bonding strength during processing but allows for easy separation afterward, resolving the contradiction between strong adhesion and easy release.
Solution Approach 2:
The patent uses composite materials by formulating the pressure sensitive adhesive layer with specific resin compositions and gel fraction characteristics. The adhesive layer comprises a composite structure that combines bonding functionality with controlled release properties, enabling both strong adhesion during processing and easy separation after heating.
2Reliability
If the adhesive strength is increased to ensure proper bonding during heating treatment, then the workpiece remains securely attached, but the workpiece becomes difficult to separate after processing
Solution Approach 1:
The patent controls the gel fraction parameter of the pressure sensitive adhesive within a specific range (5-60%) after heating treatment. This parameter optimization ensures reliable bonding during the heating process while maintaining sufficient separation ease, thereby reducing the time required for workpiece removal without compromising bonding reliability.
3Temperature
If a heat-resistant pressure sensitive adhesive is used, then the sheet can withstand heating treatment, but the adhesive strength becomes too high, causing workpieces to fuse to the sheet
Solution Approach 1:
The patent applies parameter changes by controlling the gel fraction of the pressure sensitive adhesive within a specific range (5-60%) after heating treatment. This ensures that the adhesive maintains appropriate bonding strength at elevated temperatures without becoming excessively strong, preventing workpiece fusion while maintaining heat resistance.
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 sheet enables easy separation of workpieces even after heating treatment, preventing adhesive residue and ensuring efficient processing and dicing operations.
Implementation Method 1
the pressure sensitive adhesive layer is composed of an active energy ray-curable pressure sensitive adhesive that contains a hindered amine-based stabilizer
Implementation Method 2
it is generally performed to facilitate the separation of the workpieces through configuring the pressure sensitive adhesive layer of an active energy ray-curable pressure sensitive adhesive and curing the pressure sensitive adhesive layer by active energy ray irradiation to reduce the adhesive strength to the workpieces
Data Source
AI summary
Provided is a sheet for workpiece processing that includes a base material and a pressure sensitive adhesive layer laminated on one side of the base material. The pressure sensitive adhesive layer is composed of an active energy ray-curable pressure sensitive adhesive that contains a hindered amine-based stabilizer. Such a sheet for workpiece processing enables easy separation of workpieces even when a heating treatment is performed.