Recording Medium Polymer Layer Thickness and Roughness
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Solution Overview
Problem
Existing recording media with polymer-coated base papers face challenges in achieving high turnability and opacity while maintaining the feel of silver halide photography, as reducing the thickness of the polymer layer can lead to poor winding and visibility of images on the back side through the front side in duplex recording.
Innovation Solution
A recording medium with a base paper thickness of 50 µm to 130 µm and a polymer layer thickness of 20 µm to 60 µm, featuring an arithmetic average surface roughness of 0.12 µm to 0.18 µm and a roughness curve element average length of 0.01 mm to 0.20 mm, which enhances opacity and winding without compromising image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the thickness of the polymer layer is reduced to improve turnability, then the rigidity of the recording medium decreases and turnability improves, but the opacity decreases and images on the back side become visible through the front side
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness of the polymer layer within the range of 20-60 μm and the base paper thickness within 50-130 μm. This optimization resolves the contradiction by finding the optimal thickness parameters that simultaneously provide sufficient opacity to prevent image visibility through the medium while maintaining reduced rigidity for improved turnability.
2Ease of operation
If the thickness of the base paper is reduced to improve turnability, then the rigidity decreases and turnability improves, but the winding quality deteriorates and deformation or breakage occurs
Solution Approach 1:
The patent resolves this contradiction by optimizing the base paper thickness parameter within the range of 50-130 μm. This parameter optimization achieves sufficient turnability through reduced rigidity while preventing deformation and breakage during winding processes, thereby maintaining high winding quality.
3Ease of operation
If the thickness of the polymer layer is reduced to improve turnability, then the rigidity decreases and turnability improves, but the texture similarity to photographic paper deteriorates and the feel of silver halide photograph is lost
Solution Approach 1:
The patent applies parameter changes by controlling the polymer layer thickness within 20-60 μm to maintain the texture and appearance characteristics similar to photographic paper while achieving sufficient turnability. This optimized parameter range preserves the visual and tactile qualities necessary for the silver halide photograph effect.
Data Source
AI summary
A recording medium includes a base paper (1), a polymer layer (2) disposed on the base paper, and an inkreceiving layer (3) disposed on the polymer layer. The base paper has a thickness of 50 µm or more and 130 µm or less. The polymer layer has a thickness of 20 µm or more and 60 µm or less. The polymer layer has an arithmetic average surface roughness Ra1 of 0.12 µm or more and 0.18 µm or less. The polymer layer has a roughness curve element average length RSm of 0.01 mm or more and 0.20 mm or less. The recording medium has an arithmetic average surface roughness Ra2 of 0.13 µm or less.