Multilayer Porous Body for Inkjet Image Texture Control
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Solution Overview
Problem
Inkjet recording systems face issues with image texture changes due to uneven stress applied by porous bodies during liquid component removal, leading to defects like bleeding and beading, which are not effectively addressed by existing techniques.
Innovation Solution
An inkjet recording apparatus and method utilizing a porous body with a multilayer structure, where the first layer's thickness is at least 0.08 times the average pore diameter of the second layer, to absorb liquid components from ink images, thereby controlling texture changes and suppressing bleeding and beading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a porous body is used to absorb liquid component from ink image, then liquid removal is achieved, but uneven stress is applied causing texture changes and image defects
Solution Approach 1:
The porous body is divided into multiple layers with different pore diameters. The first layer has larger pores for initial liquid absorption, while the second layer has smaller pores for fine-tuning and uniform stress distribution. This segmentation allows different regions of the porous body to perform specialized functions, preventing uneven stress concentration that causes image defects.
Solution Approach 2:
Different layers of the porous body have locally optimized properties - the first layer has larger average pore diameter for bulk liquid removal, while the second layer has smaller average pore diameter for controlled liquid absorption. This local differentiation ensures that stress is distributed uniformly across the ink image surface, preventing texture changes and bleeding defects.
2Quantity of substance
If porous body contacts ink image to absorb liquid, then liquid component is removed, but stress concentration causes bleeding and beading defects
Solution Approach 1:
The porous body is segmented into at least two layers with different pore structures. The first layer handles bulk liquid absorption while the second layer with smaller pores provides a cushioning effect that distributes stress uniformly, preventing stress concentration that leads to bleeding and beading defects in the ink image.
Solution Approach 2:
The multilayer porous body structure is designed beforehand to provide progressive cushioning against stress concentration. The larger pores in the first layer absorb liquid quickly while the smaller pores in the second layer act as a cushioning layer that prevents sudden stress changes, thereby preventing image defects before they occur.
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 solution effectively minimizes texture changes and image defects by ensuring uniform stress distribution during liquid absorption, improving the quality and stability of inkjet images.
Implementation Method 1
a porous body to be brought into contact with the ink image in order to absorb at least part of liquid component from the ink image
Data Source
AI summary
An inkjet recording apparatus according to the present invention includes an ink image forming unit for forming an ink image on an ink receiving medium by applying ink and reaction liquid for increasing viscosity of the ink onto the ink receiving medium and a liquid absorbing member having a porous body to be brought into contact with the ink image in order to absorb the liquid component from the ink image. The porous body of the liquid absorbing member includes a first layer having a first surface to be brought into contact with the ink image before liquid absorption and a second surface that is a rear surface relative to the first surface, and a second layer held in contact with the second surface of the first layer. The thickness of the first layer is not less than 0.08 times of the average pore size of the second layer.