Inkjet Image Recording on Non-Porous Substrates Without Color Bleeding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image recording methods on non-permeable substrates face issues of bleeding between colors and dot embedding during multicolor image recording, which degrade the color gamut and image quality.
Innovation Solution
An image recording method involving a pretreatment liquid with water, an aggregating agent, and a resin, followed by specific inks with controlled parameters such as droplet volume, contact angle, acid value, solid content, and droplet spacing, is applied in a sequential order to suppress bleeding and dot embedding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pretreatment liquid containing water, an aggregating agent, and a resin is applied followed by ink jet inks onto a non-permeable substrate, then multicolor image recording is enabled, but bleeding between colors and dot embedding occur
Solution Approach 1:
The patent applies parameter changes by precisely controlling the contact angle θ of the first ink within 20-60 degrees and the droplet volume V1 within 0.5-5 pL. These parameter optimizations prevent both bleeding between colors and dot embedding while maintaining multicolor image recording capability on non-permeable substrates
Solution Approach 2:
The patent uses preliminary action by applying a pretreatment liquid containing water, an aggregating agent, and a resin before ink jet application. This pretreatment layer is applied in advance to prepare the non-permeable substrate surface, enabling subsequent ink deposition without bleeding or dot embedding issues
2Ease of operation
If conventional ink jet parameters are used on non-permeable substrates, then application simplicity is maintained, but color gamut decreases due to dot embedding
Solution Approach 1:
The patent changes the droplet volume parameter V1 to 0.5-5 pL and contact angle θ to 20-60 degrees, which prevents dot embedding and preserves color gamut while maintaining ease of operation through ink jet application on non-permeable substrates
3Device complexity
If ink droplet volume and contact angle are not controlled, then application process is simple, but bleeding between colors occurs
Solution Approach 1:
The patent controls the contact angle θ within 20-60 degrees and droplet volume V1 within 0.5-5 pL to prevent bleeding between colors. This parameter optimization achieves color separation precision without significantly increasing application process complexity
Solution Approach 2:
The patent employs feedback by measuring and controlling the contact angle θ of the first ink after pretreatment liquid application. This feedback mechanism ensures that the contact angle remains within the optimal 20-60 degree range, preventing bleeding while maintaining process simplicity
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 dot embedding, enhancing the color gamut and image quality on non-permeable substrates by optimizing ink application parameters.
Implementation Method 1
a multicolor image can be recorded by applying a pretreatment liquid containing water, an aggregating agent, and a resin
Implementation Method 2
θ represents a contact angle of the first ink at a time point when T seconds have elapsed after the first ink has landed on the region onto which the pretreatment liquid has been applied
Data Source
Figure 1~2
AI summary
An image recording method including a step of applying a pretreatment liquid, a first ink, and a second ink in this order onto a non-permeable substrate, in which a value (1) is 28.0 to 35.0 and a value (2) is -200 to 200. V1 represents a volume (pL) of a liquid droplet of the first ink, θ represents a contact angle (°) of the first ink, Av1 represents an acid value (mgKOH/g) of the first ink, Av2 represents an acid value (mgKOH/g) of the second ink, S1 represents a solid content amount (% by mass) of the first ink, S2 represents a solid content amount (% by mass) of the second ink, and T represents a droplet interval (seconds) between the first ink and the second ink. Value1=V11/3×1+cosθ×14 Value2=Av1/S1−Av2/S2×Av2−Av1/T