Design-driven integrated development of technical and perceptual qualities in foam-formed cellulose fibre materials

Härkäsalmi, Tiina; Lehmonen, Jani; Itälä, Jukka; Peralta, Carlos Ferreira; Siljander, Sanna; Ketoja, Jukka A.

doi:10.1007/s10570-017-1484-6

Cited by 19 publications

(19 citation statements)

References 20 publications

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“…The foam forming technique introduced here can be applied to produce a variety of structures from a range of fibre types, we have successfully produced similar structures using fibres from peat and spent grain. This will broaden the range of applications for such non-woven fibrous materials [Härkäsalmi et al, 2017]. The compressive strength of the structures can be greatly increased with the addition of a bonding agent (PVA) to the process as found in our preliminary work.…”

Section: Discussionmentioning

confidence: 83%

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Properties of lightweight fibrous structures made by a novel foam forming technique

et al. 2019

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We describe a novel method for the production of lightweight fibrous structures of densities as low as 8.8 kg.m −3. The method is based on the use of liquid foam as a carrier medium for dispersed Kraft fibres. Different to the process of foam forming, where the quick removal of the foam results in the formation of thin fibrous sheets, our samples are allowed to slowly drain and dry until all foam has disappeared. This procedure results in bulk samples whose height (up to 25 mm) and density are controlled by initial fibre concentration and liquid fraction of the foam. Above a minimum density, the compression modulus of elasticity of the samples increases linearly with density. Furthermore, we show compressive strength of the structures being controlled via the initial liquid fraction of the foam, making this an important process parameter for the fabrication of such structures.

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Section: Discussionmentioning

confidence: 83%

“…Non-woven fibrous structures made from natural materials find many applications, including thermal insulation [Poehler et al, 2017], acoustic dampening, and visually pleasing wall panels [Härkäsalmi et al, 2017]. Here we describe a novel technique for producing bulk materials from northern bleached softwood Kraft fibres.…”

Section: Introductionmentioning

confidence: 99%

Properties of lightweight fibrous structures made by a novel foam forming technique

et al. 2019

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“…foams and fibrous networks, find wide use in weight-sensitive applications. Their ability to sustain large deformations in compression (Miltz and Ramon 1990), and the large volume fraction of enclosed air, makes them particularly useful in energy absorption applications (Gibson and Ashby 1997), insulation from thermal and vibrational sources (Poehler et al 2017), filters, and architectural panels (Härkäsalmi et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Characterization and structural properties of bamboo fibre solid foams

2020

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In this work, cellulose fibres extracted from bamboo culms were used to fabricate two types of cellular materials: rigid foams and fibrous networks. A relatively simple and low-technology fabrication method is presented, using natural binders and blowing agents to manufacture rigid foams, and fibrillation by partial hydrolysis in H2SO4 to manufacture fibrous networks. The compressive response is related to the internal microstructure and processing parameters. In the case of fibrous networks, the achievable relative density range is determined by the length of initial fibres and extent of external fibrillation. The compressive properties are dictated both by the density of the network and strength of the fibrous bridges, showing a linear stiffness-density relationship due to the length of fibres, and an inverse relationship at increased external fibrillation. The rigid foams showed an orthotropic internal microstructure but nearly isotropic compressive response, due to the influence of the interpenetrating void structure on the deformation and fracture mechanisms. The results show the potential of bamboo-fibre porous materials as low cost, lightweight structural materials.

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“…The local yielding of amorphous materials, specifically foams, its observation and manipulation are hot topics involving basic science [1][2][3][4][5][6] and heavy industry. [7][8][9] Foams can be used to study the yielding of soft matter 10 and flow in complex geometries [11][12][13][14] as well as hidden correlations via hyperuniformity, a concept that reveals systems without long-range number density fluctuations from random (poissonian) ones. 15 The related industrial applications include topics from foam forming, 16 imbibition 17 and mass transport 18 covering significant industries in manufacturing, filtration and energy.…”

Section: Introductionmentioning

confidence: 99%