Recording Medium High Inorganic Content Coating
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Solution Overview
Problem
Conventional recording media face limitations in incorporating inorganic materials beyond 10% due to paper making machine constraints, necessitating a balance with organic materials to maintain opacity, strikethrough, and bulk, which restricts the potential for higher inorganic content.
Innovation Solution
The recording medium incorporates a specific ratio of organic to inorganic materials by applying coatings and adhesives to the core substrate, allowing for increased inorganic content while reducing organic material usage, with a mineral coating layer on both surfaces and a surface treatment layer to achieve desired properties like opacity and strikethrough.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If inorganic material is incorporated into conventional recording media, then the inorganic content can be increased, but the opacity, strikethrough, and bulk properties deteriorate
Solution Approach 1:
The patent uses a composite structure combining organic and inorganic materials in specific ratios (40-70% organic, 30-60% inorganic) within the base substrate, and additional inorganic mineral coating layers on the surface. This composite approach allows high inorganic content (up to 60% in the base, plus coating layers) while maintaining opacity, strikethrough, and bulk properties through the synergistic combination of material types
Solution Approach 2:
The patent applies different material compositions to different parts of the recording medium: the base substrate contains a specific ratio of organic and inorganic materials optimized for bulk and strength, while the mineral coating layers on the surfaces contain higher inorganic content optimized for opacity and strikethrough properties. Each layer has locally optimized quality to fulfill its specific function
2Quantity of substance
If paper making machine constraints are overcome to increase inorganic material, then the inorganic content can be increased, but the manufacturing process becomes more complex
Solution Approach 1:
The patent divides the recording medium into distinct functional layers: a base substrate layer with controlled organic-inorganic ratio, and separate mineral coating layers applied to the surfaces. This segmentation allows the base to be manufactured with standard equipment at controlled composition, while additional inorganic content is added in separate coating steps, avoiding the need for complex inorganic material integration in the paper making process itself
3Object-generated harmful factors
If organic material is reduced to achieve environmental advantages, then the environmental impact is reduced, but the opacity and bulk properties may deteriorate
Solution Approach 1:
The patent changes the compositional parameters by reducing organic material content in the base substrate to 40-70% (compared to conventional higher organic content) while compensating with increased inorganic material content and additional mineral coating layers. This parameter change achieves environmental advantages through reduced organic material while maintaining opacity and bulk properties through the compensated inorganic content and coating structure
Data Source
AI summary
A recording medium and a method for making the recording medium are disclosed. The recording medium includes a core substrate. The core substrate includes a base having two opposed surfaces. The base includes from about 40% to about 70% organic material and from about 30% to about 60% inorganic material. The core substrate also includes a mineral coating layer disposed on one or both of the two opposed surfaces of the base. The mineral coating layer has a water-soluble or water-dispersible binder and mineral materials. An adhesion layer is disposed on the mineral coating layer. A surface treatment layer is disposed on the adhesion layer, and the surface treatment layer includes organic fibrous material.