Radiation-Curable Inkjet Layering for Roll Unwinding Peelability

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Solution Overview

Problem

Existing inkjet recording methods face issues with image separation and marking during unwinding of rolled recording media due to adhesion of clear ink layers to non-recording surfaces, leading to damage and poor image quality.

Innovation Solution

A method involving the use of radiation-curable inks with controlled duty and lamination to form irregularities on the recording surface, reducing adhesion and improving peelability between recording and non-recording surfaces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a clear ink layer is formed as a solid image containing the entire region where the image is formed, then image completeness and coverage are improved, but adhesion to non-recording surfaces occurs during storage, causing image separation and marks

Engineering Contradiction:

Improveimage completenessVSAvoidadhesion stability

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent applies local quality by differentiating the treatment of recording and non-recording surfaces through selective ink ejection. The ink jet head selectively ejects ink only onto the recording surface, creating a clear ink layer that covers the entire recording region while deliberately leaving the non-recording surface without ink. This localized approach ensures complete image formation on the recording side while preventing adhesion problems on the non-recording side during roll storage.

Inventive Principle:

Principle #3Local quality

2Productivity

If the recording medium is wound into a roll shape and stored, then storage efficiency and compactness are improved, but the recording surface sticks to the non-recording surface, causing image damage during unwinding

Engineering Contradiction:

Improvestorage efficiencyVSAvoidsurface adhesion

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent extracts the harmful element (ink adhesion) from the non-recording surface by using selective ink ejection. The ink jet system is controlled to eject ink only onto the recording surface, completely excluding the non-recording surface from receiving any ink. This extraction prevents the harmful adhesion effect during roll storage while maintaining the benefits of compact storage.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of applying ink to both surfaces and then trying to prevent adhesion, the patent inverts the approach by applying ink only to the recording surface and leaving the non-recording surface blank. This inversion of the conventional approach fundamentally eliminates the adhesion problem rather than attempting to manage it.

Inventive Principle:

Principle #13The other way round (Inversion)

3Manufacturing precision

If clear ink is applied to the entire recording region, then image quality and gloss are improved, but marks remain on the attached portion during unwinding

Engineering Contradiction:

Improveimage qualityVSAvoidmarks on recording surface

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The patent applies local quality by restricting ink application to only the recording surface through selective ejection control. The ink jet head is precisely controlled to eject clear ink only onto the recording surface, creating a high-quality image layer while ensuring the non-recording surface remains free of ink. This localized application prevents mark formation on the non-recording side during unwinding while maintaining excellent image quality on the recording side.

Inventive Principle:

Principle #3Local quality

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

Enhances peelability and suppresses marks on the recording surface, maintaining image quality and texture while preventing ink adhesion to non-recording surfaces during storage and unwinding.

Implementation Method 1

a first ink, which is a radiation-curable ink jet composition, is adhered to a recording medium, and then radiation is irradiated to the first ink, producing a cured coating film

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Data Source

PatentEP4046816B1Method for producing recorded matter

Publication Date: 2026.04.01 SEIKO EPSON CORP

Figure 1~2

AI summary

A method for producing a recorded matter includes a first ejection step of ejecting a first ink, which is a radiation-curable ink jet composition, and adhering the first ink to a recording medium, a first irradiation step of irradiating radiation to the first ink adhered to the recording medium to obtain a cured coating film of the first ink, a second ejection step of ejecting a second ink, which is a radiation-curable ink jet composition, and adhering the second ink to the cured coating film of the first ink so that the duty is 1% or more and 20% or less, a second irradiation step of irradiating radiation to the second ink adhered to the recording medium to cure the second ink to obtain a recorded matter, and a lamination step of laminating, in the recorded matter, a recording surface to which the first ink and the second ink have been adhered, and a non-recording surface to which the first ink and the second ink have not been adhered, so that both surfaces face each other.