Gypsum Panel Salt Sequestration Bond Strength

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Solution Overview

Problem

The presence of salt in gypsum panels can negatively affect their strength and the bond between the gypsum core and the panel facer material, leading to suboptimal performance in building applications.

Innovation Solution

Incorporating a halide salt sequestration agent, such as activated alumina or perlite, into the gypsum slurry to sequester halide salts, thereby improving the bond strength and reducing the impact of salt on panel performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If gypsum panels are manufactured using conventional gypsum slurry containing halide salts, then the manufacturing process is simple and cost-effective, but the bond strength between gypsum core and facer material deteriorates and panel performance is compromised

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidbond strength between gypsum core and facer material

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The harmful halide salts are extracted from the gypsum slurry by adding a salt sequestration agent that selectively binds and removes halide ions. This extraction process eliminates the harmful effect of salts on bond strength while maintaining the overall manufacturing process and gypsum panel production methodology

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

A salt sequestration agent is introduced as an intermediary substance between the gypsum slurry and the setting process. This agent mediates by binding to halide salts and preventing their harmful interaction with the facer material, thereby preserving bond strength without disrupting the manufacturing flow

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If halide salt sequestration agents are added to gypsum slurry, then bond strength and panel performance are improved, but the device complexity and manufacturing process become more complex

Engineering Contradiction:

Improvebond strength between gypsum core and facer materialVSAvoidmanufacturing process complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The salt sequestration agent is used as a consumable additive in small quantities during the slurry preparation stage. It performs its function of binding halide salts and is then incorporated into the final panel, eliminating the need for complex removal or recovery systems and keeping the manufacturing process relatively simple despite the added functionality

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 use of halide salt sequestration agents effectively enhances the bond strength between the gypsum core and the facer material, restoring performance levels comparable to panels without significant salt content, while also reducing environmental impact by trapping salts within the panel.

Implementation Method 1

a halide salt sequestration agent, such as activated alumina or perlite, into the gypsum slurry to sequester halide salts

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Data Source

PatentUS11136267B2Gypsum panels, methods, and systems

Publication Date: 2021.10.05 GEORGIA PACIFIC GYPSUM LLC

AI summary

Gypsum panels and methods of making gypsum panels are provided. A method of making a gypsum panel includes combining gypsum stucco and a halide salt sequestration agent with water to form a gypsum slurry and setting the gypsum slurry to form at least a portion of a gypsum core, wherein the halide salt sequestration agent is present in an amount effective to sequester at least a portion of halide salt present in the gypsum stucco. A gypsum panel includes a gypsum core that comprises set gypsum and a halide salt sequestration agent, wherein the halide sequestration agent sequesters at least a portion of halide salt present in the gypsum core.