On acoustical properties of novel foam-formed cellulose-based material

Jahangiri, Pouyan; Logawa, Banda; Korehei, Reza; Hodgson, Murray; Martinez, D. Mark; Olson, James A.

doi:10.3183/npprj-2016-31-01-p014-019

Cited by 19 publications

(18 citation statements)

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“…Furthermore, the research in the field of obtaining cellulose fibre materials using foam-forming method is in infancy. In recent studies are presented the foam-formed cellulose fibre materials 3,4 and cellulose non-woven fabric obtained from barkcloth and synthetic epoxy resin as binder 5 with good properties of thermal insulation and sound absorption. However, commercially cellulose fibre products, especially for sound absorption applications, exist only as perforated fibreboard panels, dry-laid recycled newsprint panels and sprayed natural fibre-based materials that contain a binder 6 or waste paper pellets mixed with starch and polypropylene expanded and extruded by water vapours.…”

Section: Introductionmentioning

confidence: 99%

“…This property can be explained by sound absorption coefficient in a specific frequency range that is defined as the percentage of incident sound energy that has been absorbed. 3 Comparing with other materials, those with high porosity have high sound absorption efficiency. When the porous fibre-based materials are used in sound insulation their performances are mainly influenced by the structural properties such as porosity, thickness, density, air flow resistivity or tortuosity of the cavities.…”

Section: Introductionmentioning

confidence: 99%

“…The fibres are locked between the foam bubbles and thus do not flock during transportation. In this way, a bulky and porous three-dimensional structure with open pores and unique properties is obtained 3,10 ( Figure 2). Important is the fact that in this extremely soft and porous fibrous network the structural integrity is maintained without other additives.…”

Section: Introductionmentioning

confidence: 99%

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Foam-formed cellulose composite materials with potential applications in sound insulation

Nechita

Năstac

2017

Journal of Composite Materials

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Use of foam-formed cellulose composite materials is a viable alternative that provides potential savings in terms of raw materials, energy and water compared with conventional methods for obtaining the fibrous composites. This new innovative manufacturing method leads to obtaining porous materials with low density and low environmental impact, which could replace the petroleum-based products in different industrial application fields like sound control. In this paper is presented a methodology for producing low-density cellulose composite materials in foam media. In this methodology a surfactant is mixed with cellulose fibres (from virgin pulp and recovered papers) at high shear velocity (2000 r/min) to entrain air, dewatered on Buchner funnel under low vacuum and air dried in non-restrained conditions. The obtained composite materials have been tested by sound insulation parameters (sound transmission loss and absorption coefficients) using two experimental impedance tubes with four-microphone configuration and anechoic termination. Three samples of foam-formed cellulose composites and one water-formed composite sample were obtained. Their sound insulation performances were compared with two different commercially available petroleum-based materials currently used in sound insulation applications (i.e. expanded/extruded polystyrene). The experimental results show comparable performances between foam-formed cellulose composites and polystyrene-based samples, but in terms of the environmental impact, these materials can be an appropriate green alternative which can cut the costs of recycling process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Foam-formed cellulose composite materials with potential applications in sound insulation

Nechita

Năstac

2017

Journal of Composite Materials

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“…Several studies suggest that paper pulp could be used to create sound-absorbing materials. Paper pulp was used to create a foam-like material that has similar properties to conventional foam [19]. In the paper [20], the air resistance and thermal conductivity of paper mill foam were tested.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Panels Made of Paper Sludge and Clay Composites

2021

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Studies on recycled materials emerged during recent years. This paper investigates samples’ sound absorption properties for panels fabricated of a mixture of paper sludge (PS) and clay mixture. PS was the core material. The sound absorption was measured. We also consider the influence of an air gap between panels and rigid backing. Different air gaps (50, 100, 150, 200 mm) simulate existing acoustic panel systems. Finally, the PS and clay composite panel sound absorption coefficients are compared to those for a typical commercial absorptive ceiling panel. The average sound absorption coefficient of PS-clay composite panels (αavg. in the frequency range from 250 to 1600 Hz) was up to 0.55. The resulting average sound absorption coefficient of panels made of recycled (but unfinished) materials is even somewhat higher than for the finished commercial (finished) acoustic panel (αavg. = 0.51).

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“…The effects of foam-forming parameters such as wet foam density or fibre consistency on the acoustical properties has been recently investigated. 18 In this article, we will concentrate on benchmarking the sound absorption and mechanical properties of the foam-formed softwood cellulose material against the most typical commercial acoustic materials used in the building and automotive industries. Second, we will show how the mechanical properties of the natural fibre materials can be adjusted through bio-based additives.…”

Section: Introductionmentioning

confidence: 99%

Benchmarking new wood fibre–based sound absorbing material made with a foam-forming technique

2016

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A new sound absorbing material made from 100% softwood fibres by means of a foam-forming technique is introduced. In foam forming, a wet foam is created by mechanically mixing water, fibres and a surfactant. The air bubbles keep the wet fibres separate, and a highly porous fibre network is formed during drying. The sound absorption of foam-formed structures was measured by means of an impedance tube. The results showed that foam-formed softwood materials possessed a competitive sound absorption coefficient compared to different types of commercial sound absorber materials. The material is based on 100% softwood fibres without added binders and is semi-rigid and does not completely recover from compression. Improvement in the strength properties of softwood material can be obtained by using starch or cellulose microfibrils. The material could be used in indoor applications, for example, in replacing mineral wool acoustic ceiling panels or polyester non-woven materials in office acoustics products.

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On acoustical properties of novel foam-formed cellulose-based material

Cited by 19 publications

References 0 publications

Foam-formed cellulose composite materials with potential applications in sound insulation

Foam-formed cellulose composite materials with potential applications in sound insulation

Acoustic Panels Made of Paper Sludge and Clay Composites

Benchmarking new wood fibre–based sound absorbing material made with a foam-forming technique

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