Acoustical Ceiling Tile Composition Reducing Cutting Force
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Solution Overview
Problem
Existing ceiling tile compositions face challenges in achieving sound absorption, low density, flame resistance, and sag resistance while being cost-effective and compatible with existing manufacturing processes, with limited availability of recycled materials that meet these criteria without introducing undesirable characteristics.
Innovation Solution
A ceiling tile composition comprising 15.0 to 20.0 wt % mineral wool, 9.5 to 10.5 wt % starch binder, 12.0 to 14.0 wt % cellulosic fiber (newsprint), and 55.0 to 65.0 wt % perlite, with a starch to newsprint weight ratio of 0.7 to 0.9:1, processed through a water-felting method that excludes glass beads, clay, vermiculite, gypsum, calcium carbonate, and zinc pyrithione, to produce a harder core for easier cutting and improved appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If conventional starch binder and cellulosic fiber composition is used, then the ceiling tile can be manufactured with existing processes, but the core is too soft requiring excessive cutting force especially under humid conditions
Solution Approach 1:
The patent modifies the chemical composition parameters by specifying a starch binder content of 9.5-10.5 wt% and cellulosic fiber content of 12.0-14.0 wt%, with a starch to cellulosic fiber weight ratio of 0.7-0.9:1. These parameter changes optimize the core hardness to reduce cutting force while maintaining compatibility with existing water-felting manufacturing processes
Solution Approach 2:
The patent creates a composite material system combining starch binder, cellulosic fiber (newsprint), mineral wool (15.0-20.0 wt%), and perlite (55.0-65.0 wt%) in specific proportions. This composite formulation achieves the desired core hardness and cutability while maintaining sound absorption and other performance characteristics
2Quantity of substance
If recycled cellulosic fiber is used to reduce cost, then material cost decreases, but the fiber quality varies introducing undesirable characteristics
Solution Approach 1:
The patent specifies cellulosic fiber derived from newsprint with controlled properties: alpha-cellulose content of 70-90%, lignin content of 5-30%, and fibrillation index of 5-50. These parameter specifications ensure consistent fiber quality and performance while utilizing recycled newsprint material
Solution Approach 2:
The patent applies specific quality requirements to different aspects of the cellulosic fiber: alpha-cellulose content for structural integrity, lignin content for bonding properties, and fibrillation index for water retention and formation characteristics. This localized quality control ensures reliable performance despite using recycled material
3Strength
If mineral wool and perlite are used for sound absorption and low density, then acoustic performance improves, but the composition becomes difficult to cut cleanly
Solution Approach 1:
The patent formulates a composite material containing mineral wool (15.0-20.0 wt%) for sound absorption, perlite (55.0-65.0 wt%) for low density and acoustic performance, combined with starch binder (9.5-10.5 wt%) and cellulosic fiber (12.0-14.0 wt%) for core hardness. This composite achieves both sound absorption and improved cutability
Solution Approach 2:
The patent optimizes the starch to cellulosic fiber weight ratio to 0.7-0.9:1, which enhances the core hardness and binding strength, enabling cleaner cuts through the mineral wool and perlite composite while maintaining the acoustic performance benefits of these materials
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 composition achieves satisfactory sound absorption, mechanical properties, and reduced cutting force, enhancing energy and material efficiency in the manufacturing process while maintaining low density and improved cut tile appearance.
Implementation Method 1
The slurry may first be drained by gravity followed by vacuum suction to form a base mat
Implementation Method 2
The slurry may first be drained by gravity followed by vacuum suction to form a base mat
Implementation Method 3
The wet base mat is then pressed to the desired thickness between rolls to remove additional water
Implementation Method 4
The pressed base mat is then dried in ovens before the dried material is cut to the desired dimensions
Data Source
Figure 1~2
Figure 3
Figure 3.1~3.5
AI summary
An acoustical tile including: 8 to 25 wt % mineral wool, 9 to 15 wt % starch binder, 9 to 15 wt % cellulosic fiber, wherein preferably the cellulosic fiber is newsprint, and 40 to 65 wt % perlite, wherein the weight ratio of the starch to the cellulosic fiber is 0.6 to 1.3:1; and a process for making the acoustical tile.