Thermocompression Resin Sheet Sticking Without Adhesive Transfer
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Solution Overview
Problem
The challenge lies in securing the sticking of a thermocompression bonding film and a protective film to each other while preventing the transfer of pressure sensitive adhesive from either film to a workpiece during peeling, particularly when the protective film is removed from the thermocompression bonding film after being stuck to the workpiece.
Innovation Solution
A resin sheet is designed with a thermocompression bonding film and a protective film that are peelably attached, featuring sticking sections on their inner surfaces, positioned to avoid overlapping with the region to be bonded to the workpiece, utilizing pressure sensitive adhesive or electrostatic forces for secure peeling without adhesive transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pressure sensitive adhesive layer is provided on the protective film to enable sticking, then the protective film can be attached to the thermocompression bonding film, but the pressure sensitive adhesive transfers to the thermocompression bonding film and subsequently to the workpiece during peeling
Solution Approach 1:
The patent applies local quality by providing pressure sensitive adhesive only in specific regions (marginal areas or peripheral portions) of the protective film rather than across the entire surface. This localized adhesive application enables sufficient sticking capability at the edges while preventing adhesive transfer to the central bonding region that contacts the workpiece, thereby resolving the contradiction between ease of manufacture and prevention of harmful adhesive transfer.
2Reliability
If the thermocompression bonding film is made flexible when heated for adhesion to the workpiece, then bonding capability is improved, but the film loses pressure sensitive adhesive property at normal temperature making protective film attachment difficult
Solution Approach 1:
The patent segments the functional requirements by separating the bonding function (achieved through thermocompression of the base material layer) from the protective film attachment function (achieved through pressure sensitive adhesive on the protective film). This segmentation allows the thermocompression bonding film to maintain its temperature-dependent adhesion properties while the protective film provides independent temperature-insensitive attachment capability, resolving the contradiction between reliable workpiece adhesion and ease of protective film application.
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 ensures secure peeling of the protective film from the thermocompression bonding film without transferring adhesive to the workpiece, maintaining cleanliness and adhesion integrity.
Implementation Method 1
The sticking section has a pressure sensitive adhesive
Implementation Method 2
The sticking section has a charged region for sticking the thermocompression bonding film and the protective film to each other by an electrostatic force
Implementation Method 3
the thermocompression bonding film exhibits a pressure sensitive adhesive property for adhesion to the workpiece by becoming flexible when heated
Data Source
AI summary
A resin sheet has a thermocompression bonding film that is to be thermocompression bonded to a workpiece. The resin sheet includes the thermocompression bonding film that is made of resin and has one surface which is to be thermocompression bonded to the workpiece, and a resin-made protective film that has an inner surface facing the one surface, is stuck to the thermocompression bonding film in a peelable manner, and protects the one surface. At least one of the one surface or the inner surface is provided with a sticking section for sticking the thermocompression bonding film and the protective film to each other. The sticking section is disposed in a region not overlapping, in a plan view, with a predetermined region of the one surface, the predetermined region being scheduled to be thermocompression bonded to the workpiece.