Thermal Transfer Sheet Cellulosic Resin Receiving Layer

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Solution Overview

Problem

The challenge is to create a thermal transfer sheet that maintains satisfactory transferability over a wide energy range without thermal fusion between the substrate and the transfer layer, which is currently hindered by the decrease in receiving layer transferability when high thermal energy is applied.

Innovation Solution

The thermal transfer sheet incorporates a transfer layer with a receiving layer nearest to the substrate, containing a cellulosic resin such as cellulose acetate butyrate or cellulose acetate propionate, which enhances the transferability of the receiving layer, allowing it to remain on the outermost surface after transfer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If high thermal energy is applied to transfer the transfer layer, then the transferability of the transfer layer is improved, but thermal fusion occurs between the substrate and the transfer layer

Engineering Contradiction:

ImprovetransferabilityVSAvoidthermal fusion

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a receiving layer as an intermediary component between the substrate and the transfer layer. This receiving layer acts as a mediator that accepts the transfer layer through thermal energy without causing thermal fusion between the substrate and transfer layer, thus enabling reliable transfer while preventing harmful thermal fusion effects

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the material parameter of the receiving layer to contain a cellulosic resin with specific properties. This parameter change allows the receiving layer to maintain appropriate thermal characteristics that prevent thermal fusion while still enabling effective transfer under high thermal energy conditions

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If the receiving layer is located on the outermost surface for easy image formation, then the ease of operation is improved, but the transferability of the transfer layer decreases

Engineering Contradiction:

Improveease of image formationVSAvoidtransferability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent inverts the conventional arrangement by positioning the receiving layer on the substrate side rather than on the outermost surface. This inversion allows the transfer layer to be transferred onto the receiving layer, which is then positioned on the outermost surface after transfer, thus achieving both good transferability and ease of subsequent image formation

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent performs preliminary action by positioning the receiving layer on the substrate side before transfer, so that it is ready to receive the transfer layer. This preliminary arrangement ensures that after transfer, the receiving layer is on the outermost surface for easy image formation, while the transfer process itself benefits from the receiving layer's position during transfer

Inventive Principle:

Principle #10Preliminary action

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

This configuration ensures that the transfer layer can be accurately transferred onto a receiving article without thermal fusion, maintaining high transferability even with increased energy application, thereby preventing defects like incomplete peeling or layer integration.

Implementation Method 1

a transfer layer (10) provided on a substrate (1), wherein the transfer layer (10) has a layered structure in which two or more layers are layered, the transfer layer (10) includes at least a receiving layer (2), the layer located nearest to the substrate (1) of the layers constituting the transfer layer (10) is the receiving layer (2)

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS10737520B2Thermal transfer sheet

Publication Date: 2020.08.11 DAI NIPPON PRINTING CO LTD

AI summary

There is provided a thermal transfer sheet having satisfactory transferability when a transfer layer is transferred on a transfer receiving article over a wide energy range.A thermal transfer sheet 100 for obtaining a thermal transfer image-receiving sheet includes a substrate 1 and a transfer layer 10 provided on the substrate, wherein the transfer layer 10 has a layered structure in which two or more layers are layered, the transfer layer 10 includes at least a receiving layer 2, the layer located nearest to the substrate 1 of the layers constituting the transfer layer 10 is the receiving layer 2, and the receiving layer 2 contains a cellulosic resin.