Study On Particle-Palm Fiber Composite Acoustic Board

Based on the sound absorption principle of porous material and making use of good crimpness of factory particles and toughness of palm fiber, the sound absorption performance of the low density particleboard and the particles-palm fibre composite acoustic board was studied. The production technology of the particles-palm fibre composite acoustic board with double tiling composite was optimized, the influence of the different structure design and casing treatment on the particles-palm fibre composite acoustic board was studied. The results showed that the single and three layers low density particleboard, whose density were0.3g/cm3and thickness were2cm, had a good sound absorption performance and the average sound absorption coefficient in100-5000Hz were respectively0.435and0.414when the back cavity was0cm, but failed to reach the light fiberboard standard LYT1718-2007at static bending intensity(MOR)0.9and1.0MPa; compared with the low density particleboard, the particle-palm fiber composite acoustic board had not much difference in the sound absorption, but having better MOR, and the one with double tiling composite got the highest performance-to-price ratio, the average sound absorption coefficient being0.413in the same condition and the MOR reaching2.8MPa; as the core layer particle size was2-10mm, ratio of table layer to core layer particles ratio1:6, density0.35g/cm3, thickness2.5cm, each layer of palm fibre mortar40g/1000cm2, the particle-palm fibre board had the best comprehensive performance, was best at the average sound absorption coefficient0.451in100-5000Hz when the back cavity was0cm and reached the light fiberboard standard LYT1718-2007at MOR and the thickness expansion rate of water absorbing; under the same conditions, when opening rate of facing plate3-21%, the average sound absorption performance of specimen increased with the increasing of the opening rate, and does not change significantly after opening rate21%; and at the same opening rate, aperture size had on influence significantly on sound absorption performance; in0-5cm back cavity, the sound absorption coefficient of the composite board at low frequency increased with the increase of the back cavity, but increased more and more slowly; to design a grooved panel and make the resonance absorption structure and porous sound-absorbing structure composite, it was helpful to improve the sound absorption performance at low frequency and suppress the sound absorption performance at the medium-high frequency, when the back cavity was3cm, the average sound absorption coefficient of the grooved panel was0.415in100-2000Hz, better than the plain panel who was0.402.