Foamed Opacifying Element with Spacer Particles
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Solution Overview
Problem
Existing light-blocking articles, such as blackout curtains and shades, face challenges with weight, flexibility, launderability, and the risk of dark opacifying agents escaping during handling or stitching, leading to contamination and reduced reflectivity.
Innovation Solution
A foamed, opacifying element is created using a functional composition with inorganic or organic spacer particles, applied directly on an opacifying layer, which reduces sticking issues and enhances flexibility while maintaining light-blocking properties and coloration, and includes a method for preparing this element using a foamable aqueous composition with specific components like porous particles and a binder material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If thick foam coatings with light scattering pigments are used to create light-colored blackout curtains, then light scattering and light-blocking performance are improved, but weight increases
Solution Approach 1:
The patent uses a composite structure with a light-absorbing foam layer (carbon black or grey pigment) sandwiched between two light-scattering white foam layers. This composite material approach achieves effective light-blocking and light-scattering performance while reducing the overall thickness and weight compared to using only thick light-scattering coatings.
2Weight of moving object
If carbon black layer is used between two reflective layers to reduce weight, then weight is reduced, but carbon black becomes fugitive and soils other layers during puncture or tear
Solution Approach 1:
The patent extracts the carbon black layer from direct contact with the outer white foam layers by positioning it in the middle of the sandwich structure. This spatial separation prevents carbon black migration to soil the outer layers during handling, while still maintaining the light-blocking function.
Solution Approach 2:
The patent creates a nested three-layer structure where the light-absorbing carbon black layer is nested between two protective light-scattering white foam layers. The outer white layers act as protective shells that prevent the inner carbon black layer from migrating outward during puncture or tear.
3Stability of the object's composition
If multiple separate coating operations are used to create light-absorbing middle layer between reflective layers, then light-blocking performance is improved, but manufacturing productivity decreases and unit costs increase
Solution Approach 1:
The patent merges the light-absorbing layer and light-scattering layers into a single integrated foam structure formed by one coating operation. The foamed composition contains both light-absorbing and light-scattering pigments distributed throughout the foam matrix, eliminating the need for multiple separate coating operations and improving manufacturing productivity.
4Stability of the object's composition
If thick foam coatings are used to achieve light-blocking, then light-blocking performance is improved, but flexibility and launderability deteriorate
Solution Approach 1:
The patent uses a foamed latex composition that forms a thin, flexible film coating on the fabric substrate. The foam structure provides light-blocking performance through its pigmented matrix while the thin film nature and foam morphology maintain flexibility and allow the material to be laundered without cracking or degradation.
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 provides lighter, more flexible light-blocking materials with improved launderability and reduced risk of contamination, maintaining effective light-blocking and coloration without the escape of dark agents during handling or stitching.
Implementation Method 1
coating porous fabrics with light colored foams containing light scattering pigments such as titanium dioxide or clays
Implementation Method 2
sandwich a light-absorbing, foamed black or grey pigment, such as a carbon black layer between two foamed light scattering, white pigment-containing layers
Data Source
AI summary
A foamed, opacifying element useful as a light-blocking article has a substrate; an opacifying layer disposed on the substrate, and a functional composition disposed over the opacifying layer. The functional composition comprises: (i) inorganic or organic spacer particles having a mode particle size of at least 1 μm and up to and including 100 μm, and which inorganic or organic spacer particles resist melt flow at a pressure of up to and including 100 psi (689.5 kPa) and a temperature of up to and including 220°C. These foamed, opacifying elements can be prepared by applying a foamed (aerated) aqueous composition onto the substrate, followed by drying, densifying (crushing), and curing. The functional composition can be applied to the dried foamed aqueous composition and dried.