Particulate Sound Absorption Board With Coated Sand Particles
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Solution Overview
Problem
Existing sound absorption materials, such as environmentally-friendly sandstone sound absorption boards, suffer from low porosity, unsatisfactory sound absorption coefficients, and high production costs due to their complex structure and unpredictable pore formation mechanisms, leading to inadequate sound absorption effects.
Innovation Solution
A particulate sound absorption board composed of binding agent-covered sound absorption particles with a specific angularity coefficient, featuring a skeleton and filling particle structure that forms interconnected micropores with an optimal diameter of 0.07 mm, enhancing sound absorption by promoting friction and heat energy conversion within the board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If natural sand and epoxy resin glue are pressed as the board after mixture to form the base layer, then the board structure is formed, but the porosity is low and sound absorption coefficient is low due to unpredictable pore formation mechanism
Solution Approach 1:
The patent applies preliminary action by pre-coating the surface of sand particles with binding agent before assembling them into the board structure. This pre-coating ensures that pores are formed between the coated particles rather than relying on random water evaporation, thereby controlling pore formation in advance and achieving both desired porosity and sound absorption performance
Solution Approach 2:
The patent explicitly designs a porous structure by using coated sand particles with controlled coating thickness (0.05-0.2mm) and specific particle arrangement. The pores are formed as interconnected spaces between the coated particles, creating a material with optimized porosity (40-60%) that enhances sound absorption while maintaining structural integrity
2Ease of manufacture
If the pore formation mechanism relies on water molecule evaporation, then the board can be manufactured, but the porosity is unpredictable and most pores are closed pores that can't ventilate and store air
Solution Approach 1:
The patent replaces the passive water evaporation process with an active pre-coating process where binding agent is applied to particle surfaces before assembly. This preliminary action ensures pores are formed between coated particles in a controlled manner, creating ventilated interconnected pores rather than random closed pores from evaporation
Solution Approach 2:
The binding agent coating serves as an intermediary layer on particle surfaces that controls pore formation. Instead of relying on water evaporation, the coating thickness and particle arrangement mediate the creation of uniform interconnected pores, improving both manufacturability and pore structure precision
3Manufacturing precision
If the dosage of binding agent is increased to cover the irregular external surface of sand, then the surface is covered, but the cost remains high
Solution Approach 1:
The patent optimizes the binding agent dosage by controlling coating thickness parameters (0.05-0.2mm) and selecting appropriate particle angularity coefficients (0.6-1.2). These parameter changes reduce the required binding agent quantity while maintaining adequate surface coverage and structural performance
Solution Approach 2:
The patent applies local quality by using particles with controlled angularity coefficients (0.6-1.2) that have more favorable surface characteristics for coating. This local optimization of particle geometry reduces the total binding agent needed compared to using highly irregular particles, while still achieving proper surface coverage
4Reliability
If four-layer structure is used with base layer, light material layer, gridding cloth layer and decoration surface layer, then the sound absorption board is formed, but the structure is complicated and manufacturing cost is high
Solution Approach 1:
The patent merges multiple functions into a single integrated structure. The coated sand particle board simultaneously provides structural support, sound absorption, and surface functionality, eliminating the need for separate base layer, light material layer, gridding cloth layer, and decoration surface layer. This consolidation reduces structural complexity while maintaining sound absorption performance
Solution Approach 2:
The coated particle board structure serves multiple functions universally: it provides mechanical strength as a structural layer, creates sound absorption through interconnected pores, and offers a finished surface. This multi-functionality replaces the specialized four-layer structure, simplifying the overall design while achieving the same or better performance
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 board achieves improved sound absorption coefficients and structural strength, offering better low and high-frequency sound absorption performance while reducing material costs through a controlled pore structure and binding agent usage.
Implementation Method 1
The external surface of sound absorption particle is covered with a layer of binding agent
Implementation Method 2
the entry of sound wave into the material pore will vibrate tiny fibers of air and material in the pore, and result in friction and viscous resistance, and sound energy is converted into heat energy and absorbed
Implementation Method 3
the entry of sound wave into the material pore will vibrate tiny fibers of air and material in the pore, and result in friction and viscous resistance, and sound energy is converted into heat energy and absorbed
Implementation Method 4
the latter flows into the pore between skeleton particles to form sound absorption pore
Data Source
AI summary
A particulate sound absorption board and its preparation method. The said particulate sound absorption board consists of binding agent and sound absorption particle; the external surface of sound absorption particle is covered with a layer of binding agent, and the angularity coefficient of particle covered with binding agent is less than 1.3; the said sound absorption particle consists of skeleton particle and filling particle, in which the former is used for sound absorption board skeleton, and the latter flows into the pore between skeleton particles to form sound absorption pore, and the average diameter of cross section of sound absorption pore is 0.07 mm. The two-stage manufacturing technology (i.e. coating, curing and then shaping) is adopted for the said preparation method to prevent the pore between particles from being blocked by excess binding agent, and further improve the angularity coefficient of particle.