Ink Set Peel Strength Resin Substrates
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Solution Overview
Problem
Ink jet recorded images on resin substrates often experience separation issues between the recording medium and lamination substrates due to interfacial peeling and cohesive failure, leading to poor peel strength in thermal fusion products used for decorative purposes like flooring or wall materials.
Innovation Solution
An ink set comprising an ink-jet color ink with a colorant, organic solvent, polymerizable compound, and photopolymerization initiator, and a clear ink with a vinyl chloride-vinyl acetate copolymer, where the mass content ratio of the copolymer in the clear ink is 0.40 or more, enhancing the peel strength between the recording medium and lamination substrate when thermally fused.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ink jet recording is used on resin substrates, then the recording process is simple, but separation occurs between the recording medium and lamination substrate due to interfacial peeling and cohesive failure
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weight and functional group content of the polymerizable compound in the ink composition. Specifically, the polymerizable compound has a molecular weight of 500 to 5,000 and contains 1 to 10 functional groups, which optimizes the balance between adhesion to the substrate and flexibility of the dried film, thereby improving peel strength without excessive complexity
Solution Approach 2:
The patent uses composite materials by combining the polymerizable compound with specific additives and colorants in the ink formulation. The polymerizable compound serves as a binder that creates a strong interface between the recording medium and lamination substrate, while the composite structure of the ink (polymerizable compound + additives + colorant) ensures both adhesion and flexibility, preventing interfacial peeling and cohesive failure
2Reliability
If the polymerizable compound molecular weight is increased to improve adhesion, then peel strength improves, but the ink becomes too viscous for proper jetting
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight of the polymerizable compound within the range of 500 to 5,000. This parameter optimization ensures that the compound has sufficient molecular weight to provide good adhesion and film formation, while remaining low enough to maintain appropriate viscosity for ink jetting operations. The patent also controls the functional group content (1 to 10 per molecule) to balance reactivity and viscosity
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 ink set produces a laminate with improved peel strength between the recording medium and lamination substrate, preventing separation and ensuring a strong thermal fusion product suitable for decorative applications.
Implementation Method 1
a photopolymerization initiator
Implementation Method 2
a lamination substrate may be further thermally fused onto the color image
Data Source
AI summary
An ink set includes an ink-jet color ink that contains a colorant, an organic solvent, a polymerizable compound, and a photopolymerization initiator and a clear ink which contains an organic solvent and a vinyl chloride-vinyl acetate copolymer and in which Mt2/Mt1 is 0.40 or more where Mt1 represents a total mass content of a nonvolatile component, and Mt2 represents a mass content of the vinyl chloride-vinyl acetate copolymer.