Printing Method Overhang Region Leveling
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Solution Overview
Problem
Conventional printing methods experience a reduction in image quality due to offsets between pretreatment liquids and colored inks caused by the leveling step, leading to edge portion sharpness issues and pretreatment liquid seepage.
Innovation Solution
The method involves applying a pretreatment liquid to a planned formation region and an overhang region on a target medium, moving a leveling member to spread the pretreatment liquid, and then applying printing liquid, with the overhang region adjacent and upstream of the planned formation region in the leveling member's movement direction, adjusting application densities and discharge patterns to prevent image quality reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a leveling step is performed to uniformly permeate pretreatment liquid, then uniformity of pretreatment liquid distribution is improved, but offset between pretreatment liquid and colored ink increases causing image quality reduction
Solution Approach 1:
The patent applies pretreatment liquid not only to the planned formation region but also to an overhang region upstream of the planned formation region in the leveling member movement direction. This preliminary extension of the pretreatment liquid application area compensates for the offset that occurs during the leveling step, ensuring that the pretreatment liquid and colored ink remain properly aligned and preventing image quality reduction.
2Reliability
If pretreatment liquid is applied to prevent inkjet head variation and viscosity changes, then reliability of printing is improved, but pretreatment liquid seepage occurs causing edge portion sharpness reduction
Solution Approach 1:
The patent reduces the application density of pretreatment liquid in the overhang region compared to the planned formation region. This localized variation in application density prevents excessive pretreatment liquid accumulation that would cause seepage and edge blurring, while still providing sufficient pretreatment liquid in the planned formation region to maintain printing reliability despite head variations and viscosity changes.
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
This approach effectively suppresses image quality reductions and prevents pretreatment liquid seepage by ensuring adequate pretreatment liquid distribution and maintaining edge portion sharpness.
Implementation Method 1
a leveling member (a leveling roller, a leveling blade, or a leveling squeegee) is moved on the pretreatment liquid image
Data Source
AI summary
A printing method is provided that includes: applying a pretreatment liquid to a planned formation region of a printing liquid image and an overhang region on a target printing medium to form a pretreatment liquid image with the pretreatment liquid; moving a leveling member on the pretreatment liquid image; and applying a printing liquid to the pretreatment liquid image to form the printing liquid image with the printing liquid. The overhang region is adjacent to and upstream of the planned formation region of the printing liquid image in a movement direction of the leveling member.