Foam forming of fiber products: a review

Hjelt, Tuomo; Ketoja, Jukka A.; Kiiskinen, Harri; Koponen, Antti; Pääkkönen, Elina

doi:10.1080/01932691.2020.1869035

Cited by 45 publications

(37 citation statements)

References 130 publications

(271 reference statements)

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“…Liquid foams are excellent model systems for complex cellular structures, and foams including elastic membranes as the one we describe here could have potential relevance for tissue growth [28]. Interactions between foams and flexible slender structures also occur in widely used fabrication techniques such as foam-forming of cellulose for the paper industry [29,30]. Finally, using a UV-curable system, we have proposed a way to mold materials with characteristic shapes and curves resulting from the elasto-capillary competition.…”

Section: Discussionmentioning

confidence: 99%

Elastocapillary deformation of thin elastic ribbons in 2D foam columns

Jouanlanne¹,

Egelé²,

Favier³

et al. 2021

Preprint

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The ability of liquid interfaces to shape slender elastic structures provides powerful strategies to control the architecture of mechanical self assemblies. However, elastocapillarity-driven intelligent design remains unexplored in more complex architected liquids -such as foams. Here we propose a model system which combines an assembly of bubbles and a slender elastic structure. Arrangement of soap bubbles in confined environments form well-defined periodic structures, dictated by Plateau's laws. We consider a 2D foam column formed in a square section cylinder in which we introduce an elastomer ribbon, leading to architected structures whose geometry is guided by a competition between elasticity and capillarity. In this system, we quantify both experimentally and theoretically the equilibrium shapes, using X-ray micro-tomography and energy minimisation techniques. Beyond the understanding of the amplitude of the wavy elastic ribbon deformation, we provide a detailed analysis of the profile of the ribbon, and show that such setup can be used to grant a shape to a UV-curable composite slender structure, as a foam-forming technique suitable to miniaturisation. In more general terms, this work provides a stepping stone towards an improved understanding of the interactions between liquid foams and slender structures.

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Section: Discussionmentioning

confidence: 99%

Elastocapillary deformation of thin elastic ribbons in 2D foam columns

Jouanlanne¹,

Egelé²,

Favier³

et al. 2021

Preprint

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“…This could contribute to the renewal of the paper and board industry. Using this process, it is possible to obtain of porous 3D shapes cellulose-based materials that extend the area of applications, from paper and light weight packaging as was above mentioned, to nonwoven fabrics, insulation, filtering or tissue engineering [ 24 , 36 , 37 ].…”

Section: Foam Forming Of Cellulose Based Materialsmentioning

confidence: 99%

“…This is an attractive alternative for protective and cushioning material in packaging [ 22 ]. Additionally, these materials are renewable and biodegradable, lightweight and appealing, and they have other important advantages; they can be fully recycled with regular paper and board streams and can have a large variety of end-use applications [ 23 , 24 ] (i.e., protective packaging, thermal packaging, sound and construction insulation, hydroponics etc.). A graphical illustration of these findings is presented in Figure 1 .…”

Section: Introductionmentioning

confidence: 99%

Overview on Foam Forming Cellulose Materials for Cushioning Packaging Applications

Nechita

Năstac

2022

Polymers

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Wet foam can be used as a carrier in the manufacturing of lightweight materials based on natural and man-made fibers and specific additives. Using a foam forming method and cellulose fibers, it is possible to produce the porous materials with large area of end-using such as protective and cushioning packaging, filtering, hydroponic, thermal and sound absorption insulation, or other building materials. In comparison with the water-forming used for conventional paper products, foam-forming method provides many advantages. In particular, since fibers inside the foam are mostly trapped between the foam bubbles, the formed materials have an excellent homogeneity. This allows for using long fibers and a high consistency in head box without significant fiber flocking. As result, important savings in water and energy consumptions for dewatering and drying of the foam formed materials are obtained. In cushioning packaging, foam-formed cellulose materials have their specific advantages comparing to other biodegradable packaging (corrugated board, molded pulp) and can be a sustainable alternative to existing synthetic foams (i.e., expanded polystyrene or polyurethane foams). This review discusses the technical parameters to be controlled during foam forming of cellulose materials to ensure their performances as cushioning and protective packaging. The focus was on the identification of practical solutions to compensate the strength decreasing caused by reduced density and low resistance to water of foam formed cellulose materials.

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“…In the short term, there is clear interest in the use of fibrous cellulosic materials, on all length-scales (nano to macrofibrillar), in applications such as improved-strength composite materials (Hubbe and Grigsby 2020). Paper-grade pulp, specifically, is finding rapid adoption in foam-forming (Hjelt et al 2021). A longer-term goal is the use of paper-grade pulp (Ma et al 2018;Kuura 2021) and perhaps even lower purity and recycled cellulosics in regenerated fibre production (Haslinger et al 2019).…”

Section: Main Textmentioning

confidence: 99%

Highly regioselective surface acetylation of cellulose and shaped cellulose constructs in the gas-phase

Koso

Beaumont

Tardy

et al. 2021

Preprint

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Gas-phase acylation of cellulose is an attractive method for modifying the surface properties of cellulosics. However, little is known concerning the regioselectivity of the chemistry, in terms of which cellulose positions are preferentially acylated and if acylation can be restricted to the surface, preserving crystallinities/morphologies. Consequently, we reexplore simple gas-phase acetylation of modern-day cellulosic building blocks – cellulose nanocrystals, pulps, regenerated fibre and aerogels. The gas-phase acetylation is shown to be highly regioselective for the C6-OH, is further supported with computational modelling. This contrasts with liquid-state acetylation, highlighting that the gas-phase chemistry is much more controllable, yet with similar kinetics to the uncatalyzed liquid-phase reactions. Furthermore, this method preserves both the native crystalline structure of cellulose and the supramolecular morphologies of even delicate cellulosic constructs (aerogel exhibiting retention of chiral cholesteric liquid crystalline phases). Therefore, we are convinced that this methodology will lead to more rapid adoption of precisely tailored and cellulosic materials

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Foam forming of fiber products: a review

Cited by 45 publications

References 130 publications

Elastocapillary deformation of thin elastic ribbons in 2D foam columns

Elastocapillary deformation of thin elastic ribbons in 2D foam columns

Overview on Foam Forming Cellulose Materials for Cushioning Packaging Applications

Highly regioselective surface acetylation of cellulose and shaped cellulose constructs in the gas-phase

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