Coated Paperboard Opaque and Barrier Layers for Wet Brightness
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Solution Overview
Problem
Coated paperboards without a white fiber layer suffer from visibility issues and deteriorated optical properties when water is applied, leading to rejection or reduced pricing due to the visibility of brown layers through the coating.
Innovation Solution
A coated paperboard system comprising a base substrate with an opaque layer and a barrier layer, where the opaque layer is applied to cover the base substrate, and the barrier layer prevents aqueous fluids from contacting the opaque layer, maintaining optical properties even when wet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the white fiber layer is removed to lower cost, then manufacturing cost is reduced, but the brown layer becomes visible through the coating layer deteriorating optical properties
Solution Approach 1:
The coating is divided into two functional layers: an opaque layer containing white filler that provides brightness and hides the brown base substrate, and a barrier layer that prevents water penetration. This segmentation allows each layer to perform its specific function optimally without requiring a white fiber layer.
Solution Approach 2:
The coating uses a composite structure combining an opaque layer with white filler materials and a barrier layer with water-resistant properties. This composite approach achieves both optical properties (brightness and hiding power) and functional properties (water resistance) without using traditional white fiber layers.
2Ease of manufacture
If the white fiber layer is removed to lower cost, then manufacturing cost is reduced, but the coated paperboard is rejected or sold at reduced price due to poor optical properties
Solution Approach 1:
The coating is divided into two functional layers: an opaque layer containing white filler that provides brightness and hides the brown base substrate, and a barrier layer that prevents water penetration. This segmentation allows each layer to perform its specific function optimally without requiring a white fiber layer.
Solution Approach 2:
The coating uses a composite structure combining an opaque layer with white filler materials and a barrier layer with water-resistant properties. This composite approach achieves both optical properties (brightness and hiding power) and functional properties (water resistance) without using traditional white fiber layers.
3Ease of operation
If water is applied to the coating without a barrier layer, then the coating appears to function normally when dry, but the brown layer becomes visible when wet deteriorating optical properties
Solution Approach 1:
The barrier layer is applied in advance over the opaque layer to prevent water from reaching and penetrating the coating structure. This preliminary protective action ensures that the optical properties remain stable both when dry and when wet, as the barrier layer blocks water penetration before it can affect the opaque layer.
Solution Approach 2:
The coating uses a composite structure combining an opaque layer with white filler materials and a barrier layer with water-resistant properties. This composite approach achieves both optical properties (brightness and hiding power) and functional properties (water resistance) without using traditional white fiber layers.
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 system effectively retains the optical properties of the coated paperboard, ensuring a high brightness and minimal wet brightness drop, thus preventing the visibility of the base substrate and maintaining the paperboard's quality.
Implementation Method 1
a barrier layer covering the opaque layer; wherein the barrier layer substantially prevents aqueous fluids from contacting the opaque layer
Implementation Method 2
one or more opaque layers including a white filler, wherein the opaque layer covers the base substrate so that visibility of the base substrate through the opaque layer is substantially eliminated
Data Source
AI summary
A coated paperboard (100) comprising: a base substrate (102) having a brightness of about 65 or less measured using TAPPI T452 and a coating (104) on at least one side of the base substrate, wherein the base substrate comprises: one or more opaque layers (114) including a white filler, wherein the opaque layer covers the base substrate so that visibility of the base substrate through the opaque layer is substantially eliminated; a barrier layer (116) covering the opaque layer; wherein the barrier layer substantially prevents aqueous fluids from contacting the opaque layer, and wherein the coated paperboard has a brightness on the side of the base substrate with the coating of about 65 or more measured using TAPPI T452, and a wet brightness drop, on the side of the base substrate with the coating, of about 30 or less, measured using the wet brightness drop test.