Variable-Density Plaster Board for Edge Strength and Lower Weight
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Solution Overview
Problem
Conventional plaster boards have uniform density and strength, leading to excessive weight and potential uneven nail pull due to the addition of high-density skim coats, which can be pushed out of position during application.
Innovation Solution
A plaster board design with varying densities, featuring higher density edges and a lower density center, achieved by applying distinct plaster slurry lines with controlled densities during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a high density skim coat is applied to increase nail pull strength, then the strength is improved, but the weight of the plaster board increases
Solution Approach 1:
The patent applies different densities of plaster material to different locations on the board. High density plaster is applied only at the edges where nail pull strength is needed, while the center uses lower density plaster for reduced weight. This local differentiation resolves the contradiction by providing strength only where required rather than uniformly across the entire board.
2Strength
If a high density skim coat is applied to improve strength, then the strength is improved, but the skim coat can be pushed out of position during application
Solution Approach 1:
The patent applies a preliminary skim coat layer before applying the main layer of plaster material. This preliminary skim coat is then protected from being pushed out by the subsequent main layer application. The preliminary action of applying the skim coat first establishes the high-density edge structure that will provide nail pull strength, while the process prevents displacement issues.
3Weight of stationary object
If the density of plaster material is reduced to decrease weight, then the weight is reduced, but the strength of the plaster board becomes weaker
Solution Approach 1:
The patent uses lower density plaster material in the center portion of the board where full strength is not required, reducing overall weight. Meanwhile, high density plaster material is concentrated at the edges where structural strength and nail pull resistance are critical. This spatial differentiation of material density resolves the contradiction between weight reduction and strength maintenance.
Data Source
AI summary
The present disclosure relates to a plaster board comprising a first panel having an outer surface, an inner surface, a first edge, a second edge, and a center between the first edge and the second edge, a layer of hardened plaster material coupled to the inner surface of the first panel, wherein the hardened plaster material has a first density proximate the first edge of the first panel and a second density proximate the center of the first panel, the first density being greater than the second density, and a second panel having an outer surface, an inner surface, a first edge, a second edge, and a center between the first edge and the second edge, wherein the second panel is coupled to the hardened plaster material opposite the first panel.