Plasterboard Core Pore Structure for Low-Weight Strength Balance
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Solution Overview
Problem
Existing plasterboards face a trade-off between increased porosity for reduced weight, improved acoustic properties, and reduced dust generation, which compromises mechanical strength and increases water-to-stucco ratio (WSR), leading to high energy consumption during drying.
Innovation Solution
A plasterboard design with a plaster core comprising a matrix of gypsum crystals and air pores, where at least 90% of the air pores are connected by constrictions, and the average neighbor coordination of connected air pores is between 1.1 and 6, optimizing porosity for reduced weight, acoustic properties, and lower WSR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If porosity is increased to reduce weight and improve acoustic properties, then weight and acoustic performance are improved, but mechanical strength deteriorates
Solution Approach 1:
The patent applies porous materials by introducing a controlled pore network structure into the plasterboard core. The pores are created through a foaming process where a foaming agent is incorporated into the plaster slurry, generating bubbles that form a cellular structure upon drying. This porous structure reduces weight while maintaining mechanical strength through the optimized cell wall thickness and interconnected pore geometry, resolving the contradiction between weight reduction and strength preservation.
Solution Approach 2:
The patent employs composite materials by combining plaster (calcium sulfate hemihydrate) with a foaming agent to create a composite matrix structure. The resulting material consists of gypsum crystals forming the solid phase and air-filled pores forming the void phase, creating a composite structure that achieves both lightness and structural integrity. The interfacial bonding between the plaster matrix and pore structure ensures mechanical strength is maintained despite the reduced density.
2Object-affected harmful factors
If porosity is increased to improve acoustic properties, then sound absorption is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent utilizes porous materials with a specific pore network structure optimized for acoustic performance. The interconnected pores with controlled size distribution (0.1-10 mm) create tortuous paths for sound wave propagation, enhancing sound absorption through viscous losses and thermal effects. The pore wall structure is designed to maintain sufficient thickness and bonding strength to preserve mechanical integrity while maximizing acoustic damping properties.
3Quantity of substance
If water-to-stucco ratio is increased to achieve desired porosity, then porosity is improved, but energy consumption during drying increases
Solution Approach 1:
The patent applies parameter changes by optimizing the water-to-stucco ratio to a specific range (0.35-0.65) that balances porosity achievement with drying efficiency. This parameter optimization ensures sufficient water content to form the desired pore structure during the foaming process while limiting excess water that would require high energy input for evaporation. The controlled water content allows the foam structure to set properly without creating overly wet slurry that would prolong drying time and increase energy consumption.
4Quantity of substance
If water-to-stucco ratio is increased to achieve desired porosity, then porosity is improved, but water consumption increases
Solution Approach 1:
The patent implements parameter changes by precisely controlling the water-to-stucco ratio within the optimized range of 0.35-0.65. This parameter control ensures that sufficient water is present to facilitate the foaming process and create the desired porous structure, while excess water is avoided. The optimized water content allows the foam bubbles to form and stabilize properly during mixing, then evaporates efficiently during drying, minimizing overall water consumption while achieving the target porosity level.
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 achieves reduced weight, improved acoustic properties, and lower dust generation while maintaining mechanical strength and reducing water and energy consumption.
Implementation Method 1
Air pores are produced using a foaming agent and/or an aeration device
Implementation Method 2
Air pores are produced using a foaming agent and/or an aeration device
Implementation Method 3
Most of this water is removed by drying. A drying method is costly because it requires large amounts of energy to evaporate the water
Data Source
AI summary
The invention relates to plasterboard comprising a plaster core arranged between two cover sheets;wherein said plaster core comprises a matrix of gypsum crystals and air pores;wherein at least 90%, preferably at least 94%, more preferably at least 98%, of the air pores are connected by a constriction; andwherein the average neighbor coordination of the connected air pores is between 2 and 6, preferably between 3 and 5.