Barrier Backing Layer Adhesion in Thermosensitive Recording Medium
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Thermosensitive recording media experience issues with adhesion between the support layer and the barrier backing layer, water resistance, and stability of the barrier backing layer coating, leading to curling problems even when an adhesive is applied.
Innovation Solution
A thermosensitive recording medium comprising a synthetic resin film support layer, a thermosensitive coloring layer with a leuco dye and developer, one or more protective layers, and a barrier backing layer containing polyvinyl alcohol with a degree of saponification of at least 70%, which enhances adhesion and reduces curling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a back layer is provided between the support and adhesive layer, then adhesion between back layer and support reduces, but peeling occurs from the portion at which adhesion is weakened
Solution Approach 1:
The invention changes the chemical composition parameters of the barrier backing layer by specifying polyvinyl alcohol with degree of polymerization 100-500 and saponification degree 70-99%, along with controlled amounts of plasticizer (5-20 parts by mass) and crosslinking agent (1-10 parts by mass), to achieve optimal balance between adhesion and peeling resistance
Solution Approach 2:
The barrier backing layer is formulated as a composite material system containing polyvinyl alcohol as base resin, plasticizer for flexibility, and crosslinking agent for strength, creating a multi-component system that simultaneously provides adhesion and prevents peeling
2Stability of the object's composition
If synthetic paper or plastic film having higher smoothness than that of paper is used as a support, then dimensional stability improves, but curling of the thermosensitive recording material occurs
Solution Approach 1:
The barrier backing layer acts as an intermediary between the smooth synthetic resin film support and the adhesive layer, providing a surface that maintains dimensional stability while preventing curling through its specific composition of polyvinyl alcohol with controlled plasticizer and crosslinking content
Solution Approach 2:
The invention changes the physical parameters of the barrier backing layer by controlling the degree of polymerization (100-500) and saponification degree (70-99%) of polyvinyl alcohol, along with plasticizer and crosslinking agent content, to achieve the right balance between dimensional stability and curl prevention
3Strength
If low molecular weight components such as plasticizer, tackifier, and emulsifier are contained in adhesive, then adhesion improves, but these components migrate into back layer or support, reducing adhesion with back layer
Solution Approach 1:
The invention converts the potential harm of plasticizer migration by controlling the plasticizer content (5-20 parts by mass) and type in the barrier backing layer, transforming it from a harmful migrating component into a beneficial element that provides flexibility and controlled adhesion without excessive migration
Solution Approach 2:
The invention changes the composition parameters by specifying exact ranges for plasticizer (5-20 parts by mass) and crosslinking agent (1-10 parts by mass) content in the barrier backing layer, optimizing the balance between initial adhesion and long-term adhesion stability
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 solution achieves excellent adhesion between the support layer and the barrier backing layer, improves water resistance and stability of the barrier backing layer coating, and significantly reduces curling, especially when an adhesive is applied.
Implementation Method 1
the barrier backing layer (20) contains a polyvinyl alcohol characterized by a degree of saponification of at least 70%... achieves excellent adhesion between the support layer and the barrier backing layer
Implementation Method 2
improves water resistance and stability of the barrier backing layer coating
Data Source
AI summary
A thermosensitive recording medium includes at least: a synthetic resin film support layer; a thermosensitive colouring layer which contains a leuco dye and a developer; one or more protective layers which is/are laid down on the thermosensitive colouring layer, on the opposite side with respect to the synthetic resin film support layer, and one barrier backing layer which is laid down on the synthetic resin film support layer, on the opposite side with respect to the thermosensitive colouring layer. The barrier backing layer contains a polyvinyl alcohol characterized by a degree of saponification of at least 70%.