Low Density Gypsum Panel with Porous Core
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Solution Overview
Problem
There is a need for gypsum panels that are lightweight and low in density while maintaining desired mechanical and acoustical properties, as conventional panels often compromise on these characteristics.
Innovation Solution
A gypsum panel with a gypsum core that includes gypsum, a foaming agent, and optionally starch, featuring air voids with an average size of 50 microns or more, resulting in a density of 33 pcf or less and an NRC value of 0.2 or more, is developed, along with a method of making such panels by applying a gypsum slurry with a foaming agent and starch onto facing materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If conventional gypsum panels are used, then mechanical properties are maintained, but density and weight are higher than desired
Solution Approach 1:
The gypsum panel incorporates air voids with an average size of 50 microns or more throughout the gypsum core, creating a porous structure that reduces density to 33 pcf or less while maintaining mechanical integrity through the controlled void architecture
Solution Approach 2:
The invention changes the physical parameters of the gypsum panel by controlling void size (50 microns or more), starch content (less than 4 wt.%), and density (33 pcf or less), transforming conventional dense gypsum into a lightweight yet mechanically sound material
2Weight of moving object
If gypsum panel density is reduced, then weight decreases, but acoustical properties may deteriorate
Solution Approach 1:
The controlled porous structure with air voids of 50 microns or more provides sound absorption capabilities, achieving an NRC value of 0.2 or more while maintaining the lightweight characteristic of 33 pcf density or less
Solution Approach 2:
The gypsum panel combines gypsum with controlled air voids and limited starch (less than 4 wt.%) to create a composite material that simultaneously achieves lightweight properties and acceptable acoustical performance
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 resulting panels exhibit improved acoustical properties with higher NRC values compared to conventional panels, maintaining mechanical properties and handling characteristics while being lightweight and low in density.
Implementation Method 1
The gypsum core includes gypsum, a foaming agent, and optionally starch in an amount of less than 4 wt. % based on the weight of gypsum. The gypsum core includes air voids having an average void size of 50 microns or more.
Implementation Method 2
providing a gypsum slurry comprising stucco, a foaming agent, optionally starch in an amount of less than 4 wt. % based on the weight of stucco, and water onto the first facing material, providing a second facing material onto the gypsum slurry, and allowing the stucco to set
Data Source
AI summary
The present invention is directed to a gypsum panel and a method of making a gypsum panel. The gypsum panel comprises a gypsum core and a facing material. The gypsum core includes gypsum, a foaming agent, and optionally starch in an amount of less than 4 wt. % based on the weight of gypsum. The gypsum core includes air voids having an average void size of 50 microns or more. The gypsum panel has a density of 33 pcf or less, a weight of 1,800 lbs/MSF or less, and an NRC value of 0.2 or more.