Transfer Film Segmented Release Layer Adhesion
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Solution Overview
Problem
Existing transfer films face challenges in achieving satisfactory transferability of the transfer layer without causing defective transfers such as tailing and burrs, especially when the adhesion between the transfer layer and the release layer is high.
Innovation Solution
A transfer film with a layered structure comprising a substrate, an adhesion layer, a release layer, and a transfer layer, where the transfer layer has a protective layer and an adhesive layer. The adhesion layer contains a cured binder resin to enhance adhesion between the substrate and the release layer, reducing irregular transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the adhesion between the transfer layer and the release layer is high, then the transfer layer can be securely held during handling, but irregular transfer occurs where the release layer is transferred together with the transfer layer
Solution Approach 1:
The invention divides the release layer into two distinct layers: a first release layer in contact with the transfer layer providing high adhesion for secure handling, and a second release layer adjacent to the substrate providing low adhesion to prevent irregular transfer. This segmentation allows each layer to perform its specific function independently, resolving the contradiction between holding strength and transfer precision.
2Ease of operation
If a release layer is provided between the substrate and the transfer layer, then transferability is improved, but the release layer may be transferred together with the transfer layer causing defective transfer
Solution Approach 1:
The invention applies local quality by giving different adhesive properties to different parts of the release layer structure. The first release layer has high adhesion to the transfer layer locally where contact occurs, while the second release layer has low adhesion to the substrate locally where contact occurs. This localized differentiation of properties enables both improved transferability and prevented defective transfer.
3Strength
If the protective layer is formed by curing an ionizing radiation-curable resin, then film cutting on transfer and durability are improved, but adhesion between the protective layer and the release layer increases causing irregular transfer
Solution Approach 1:
The segmented release layer structure isolates the cured protective layer from direct contact with the substrate. The first release layer can be designed with properties compatible with the cured protective layer, while the second release layer ensures low adhesion to the substrate. This segmentation allows the protective layer to achieve high durability through curing without causing irregular transfer to the substrate.
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 proposed transfer film ensures high durability and satisfactory transferability of the transfer layer, minimizing defective transfers and improving the mechanical and chemical durability of the printed surface.
Implementation Method 1
The adhesion layer contains a cured binder resin to enhance adhesion between the substrate and the release layer
Data Source
Figure 1
AI summary
The present invention provides a transfer film that allows a transfer layer to have satisfactory transferability and can provide a print with high durability. The present invention solves the above problem by a transfer film 100 in which an adhesion layer 7, a release layer 2, and a transfer layer 10 are provided in this order on a substrate 1, wherein the transfer layer 10 has a layered structure in which a protective layer 3 and an adhesive layer 5 are layered in this order from the side of the substrate, the protective layer 3 is allowed to contain an active ray-cured resin formed by curing an active ray-curable resin by an active ray, and the adhesion layer 7 is allowed to contain a cured binder resin which is a cured product of a binder resin and a curing agent.