Inkjet Precoat Layer Resin Curing for Adhesion
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Solution Overview
Problem
Aqueous inkjet inks face challenges with bleeding and insufficient adhesion on water-non-absorbing recording media, leading to potential cracking under high humidity storage.
Innovation Solution
A precoat layer is formed using a liquid containing a resin with functional groups that react with a curing agent and a curing agent, with controlled drying temperatures to enhance water resistance and ink penetrability, preventing bleeding and improving adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a treatment liquid containing polyvinyl alcohol and water is applied to a water-non-absorbing recording medium, then ink absorbability is enhanced, but adhesion remains insufficient
Solution Approach 1:
The patent changes the chemical parameters of the treatment liquid by incorporating specific resin components with functional groups that provide both ink absorbability and adhesion properties. The resin content and molecular weight are optimized to achieve the dual function of absorbing ink while bonding to the recording medium.
Solution Approach 2:
The treatment liquid uses a composite system combining polyvinyl alcohol with other resin components to achieve multiple functions. This composite approach allows the treatment layer to simultaneously provide ink absorbability, adhesion, and water resistance that single-component systems cannot achieve.
2Reliability
If a treatment liquid is applied to enhance ink absorbability, then bleeding is suppressed, but water resistance is insufficient causing cracks under high humidity
Solution Approach 1:
The patent modifies the chemical composition parameters of the treatment liquid by adding resin components with specific functional groups that provide water resistance. The molecular weight, concentration, and type of resin are optimized to prevent cracking under high humidity while maintaining bleeding suppression.
Solution Approach 2:
The treatment liquid employs a composite resin system that combines polyvinyl alcohol with additional resin components to simultaneously achieve bleeding suppression and water resistance. This composite material approach creates a treatment layer with enhanced stability under high humidity conditions.
3Strength
If a precoat layer is formed with resin and curing agent, then water resistance and adhesion are improved, but process complexity increases
Solution Approach 1:
The patent combines the precoat layer formation with the ink application process by incorporating all necessary components (resin, curing agent, and ink) into a single treatment liquid formulation. This merging eliminates separate coating and curing steps, reducing process complexity while maintaining adhesion benefits.
Solution Approach 2:
The treatment liquid is designed to self-cure through the interaction of resin and curing agent components within the layer itself, eliminating the need for external curing equipment or processes. This self-service approach simplifies the overall process while achieving the desired adhesion and water 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 method effectively suppresses bleeding and enhances image adhesion and water resistance, preventing cracks under high humidity conditions.
Implementation Method 1
the ink absorbability of the recording medium to which the treatment liquid is applied is enhanced
Implementation Method 2
a precoat liquid containing: a resin having a functional group that reacts with a curing agent; a curing agent
Data Source
AI summary
This inkjet image formation method has: a precoat liquid application step in which a precoat liquid is applied to a film substrate, the precoat liquid including a curing agent, a resin having a function group that reacts with the curing agent, and water; a precoat liquid drying step in which the precoat liquid applied to the film substrate is dried to form a precoat layer; an ink application step in which an ink is applied to the precoat layer by an inkjet method, the ink containing at least a coloring material, an organic solvent, and water; and an ink drying step in which the ink applied to the precoat layer is dried to form an image. The drying temperature T1, which is the highest temperature during the precoat liquid drying step, and the drying temperature T2, which is the highest temperature during the ink drying step, satisfy the condition T2 > T1.