Gypsum Slurry Ultrasonic Acceleration

Solution Overview

Problem

Conventional gypsum set accelerators lose efficiency when exposed to heat and moisture, leading to prolonged setting times in the production of gypsum plasterboard, and require additional coatings to maintain effectiveness.

Innovation Solution

The application of ultrasonic energy to the gypsum slurry, either directly or through a mixer outlet, in combination with a chemical accelerator like potassium sulphate, significantly reduces the setting time and prevents material buildup by accelerating crystallization and improving mixer efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If conventional gypsum set accelerators are used, then the setting time can be reduced, but the accelerators lose efficiency when exposed to heat and moisture, requiring additional coatings and increasing complexity

Engineering Contradiction:

Improvesetting timeVSAvoidaccelerator coating system

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The patent replaces chemical accelerators with ultrasonic energy application to accelerate gypsum setting. The ultrasonic vibration field directly acts on the gypsum slurry to promote crystallization without requiring chemical additives or their protective coatings, thereby eliminating the complexity of coating systems while achieving rapid setting.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the physical state and properties of gypsum through ultrasonic energy application. The ultrasonic vibration alters the crystallization process by providing mechanical energy that promotes nucleation and crystal growth, changing the setting characteristics without relying on chemical accelerators that require protective coatings.

Inventive Principle:

Principle #35Parameter changes

2Loss of time

If chemical accelerators are used, then setting time is reduced, but material buildup occurs in the mixer requiring frequent cleaning

Engineering Contradiction:

Improvesetting timeVSAvoidmixer maintenance

Core Design Contradiction:

Loss of timeVSEase of manufacture

Solution Approach 1:

The patent replaces chemical accelerators with ultrasonic energy to accelerate setting. This substitution eliminates the chemical reactions that cause material buildup in the mixer, thereby reducing maintenance requirements while still achieving rapid setting through physical ultrasonic energy application.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If accelerator quantity is increased to compensate for heat and moisture exposure, then setting acceleration is maintained, but the cost and complexity increase

Engineering Contradiction:

Improveaccelerator effectivenessVSAvoidaccelerator dosing system

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces chemical accelerators with ultrasonic energy application, eliminating the need for dosing systems and quantity control mechanisms. The ultrasonic energy provides consistent setting acceleration without the complexity of dosing systems or the reliability issues associated with accelerator degradation in heat and moisture.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

This method decreases the setting time of the gypsum slurry, reduces the need for excessive accelerator quantities, and enhances the manufacturing process by ensuring consistent and efficient production of gypsum plasterboard with improved density and compressive strength.

Implementation Method 1

The application of ultrasonic energy to the gypsum slurry, either directly or through a mixer outlet, in combination with a chemical accelerator like potassium sulphate, significantly reduces the setting time and prevents material buildup by accelerating crystallization

Methodology Applied

Scientific EffectUltrasonic energy: Ultrasound

Implementation Method 2

The application of ultrasonic energy to the gypsum slurry, either directly or through a mixer outlet, in combination with a chemical accelerator like potassium sulphate, significantly reduces the setting time and prevents material buildup by accelerating crystallization

Methodology Applied

Scientific EffectUltrasonic vibration: Ultrasonic Vibration

Data Source

PatentEP1951636B1Cementitious board manufacture

Publication Date: 2013.10.16 BPB LTD

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AI summary

A method of accelerating the setting reaction of calcium sulphate hemihydrafce and water comprises the steps of mixing water and calcium sulphate hemihydrate to produce a slurry adding an accelerator to said mixture applying ultrasonic energy to said mixture. Application of ultrasound to the plaster slurry accelerates crystallization and thus reduces the setting time. A further benefit is reduced density of the wall boards.