Microplastics accumulate in various aquatic organisms causing serious health issues, and have raised concerns about human by entering our food chain. The recovery techniques for the most challenging colloidal fraction are limited, even analytical purposes. Here we show how a hygroscopic nanocellulose network acts as an ideal capturing material tiniest nanoplastic particles. We reveal that entrapment of particles from aqueous environment is primarily result network's nature - feature which...

Abstract Novel lightweight cellulose fibre materials containing various strength enhancing polymeric and fibrillar components were formed with the help of foam technology. Increasing inter-fibre bond local material density was attempted unique lignin-containing wood fines (V-fines), microfibrils (CMF), TEMPO-oxidized nanofibrils (TCNF), macromolecules such as cationic starch, polyvinyl alcohol (PVA), locust bean gum (LBG). The investigated fibres included both long hemp bast northern...

The foaming properties of typical chemithermo-mechanical (CTMP) and kraft pulp paper making formulations in the presence a series surfactants were investigated using lab-scale set u ...

Cellulose fiber materials suitable for filtering, insulation, protective, and hygiene applications can be formed using aqueous foam as a carrier phase. The subtle fiber–bubble interaction provides tool which utilized to alter both structural mechanical material properties. Earlier model surface studies have only indicated clear surface-bubble adhesion when the hydrophobicity tension of solution are high enough. In this work, we first show that silica surfaces these basic mechanisms similar...

This article focuses on the properties of paper samples made using foam-laid technology. The effects of three surfactants, namely sodium dodecyl sulphate (SDS), alkyl ether (SAES), ...

Wet foams were produced via agitation and compressed air bubbling of aqueous solutions carboxymethylated lignin (CML). Bubble size distribution assessed in situ optical microscopy. Foamability, bubble collapse rate, foam stability (half-life time) analyzed as a function CML concentration, temperature, pH, content. Dynamic changes the liquid monitored by light transmission backscattering. Cellulosic fibers different aspect ratios (long pine short birch fibers) suspended under (0.6% phase)...

Abstract Foam forming has recently attracted increasing interest due to the paper industry’s continual efforts find new possibilities minimize raw material consumption, and improve energy water efficiency. is also thought be a possible solution need widen its product portfolio with novel more valuable products. In foam forming, properties (air content, bubble size half-life) are obviously key process variables, but there only few studies in which their effect on sheet have been studied pilot...

Wet-laying is a mature technology that applied in large scale for the manufacture of nonwovens, including paper products. However, it usually uses volumes water and energy-intensive. Here we used foam-laying to substantially diminish volume consumed formation fiber networks (5-fold reduction) reduce content nonwovens produced before drying, achieving reduced energy demand. The prospects were evaluated by comparing foam-laid wet-laid webs two types wood fibers: stiff (lignin-containing) or...

Abstract Surfactant residues in foam forming are related to the circulation of surfactant foaming process, but they may also affect properties foam-formed product. In this work, an anionic surfactant, sodium dodecyl sulphate (SDS), products were studied. Two different methods applied for determination SDS: ICP-OES (Inductively Coupled Plasma Optical Emission Spectroscopy) and solvent extraction spectrophotometry. The dry matter content sample before drying step has a significant effect on...

Abstract Some paper and paperboard grades require strength also when rewetted. The purpose of this study was to investigate the impact web forming method, different foaming agents, polyamideamine-epichlorohydrin (PAE) wet resin, retention aids on development hand sheets. Only a slight, if any, improvement in dry tensile due PAE resin observed. improved water-laid sheets, systems had minor but positive impact. Although lower at given addition levels, trend similar with sheets foam-laid an...

This paper summarizes recent developments in foam forming that were mainly carried out pilot scale. In addition to improving the efficiency of existing processes and allowing better uniformity material, a wide variety raw materials can be utilized forming. The focus this is thin webs—papers, boards foam-laid nonwovens, along with scale results obtained at VTT Finland. For board grades, most direct advantage potential produce very uniform webs from longer coarser fibers obtain material...

Technology developed for computer-controlled mirror manufacturing is described. The polishing tool equipped with electromagnetic force actuators to regulate the local forces according measured errors. Optical testing interferometric modification of Hartmann test and a CCD-camera as detector allow accurate fast measurement high sampling frequency. Air turbulence vibration effects are minimized in workshop which blasted into bedrock good thermal insulation.

The use of polyvinyl alcohol (PVOH or PVA) as a foaming agent in foam formed paper was investigated. Polyvinyl is linear, nonionic water-soluble polymer. It has hydrophobic and hydrophilic parts that give it surface-active character. PVOH mainly characterized by degree hydrolysis molar mass. Degree given mol-% hydroxyl groups on the Molar mass measured indirectly measuring viscosity 4% solution. results show had strong effect foamability PVOH. Foamability decreased strongly when increased...

Abstract When studying the properties of cellulose nanofibrils (CNF) enriched fiber products, it is essential to be able determine retention and spatial distribution CNF inside end-product. That is, how much where has been attached. As fibers share same density chemical composition, labeling required distinguish them from each other. In this work, we have applied iron iron-cobalt -labeling. Labeling with more desirable because carcinogenic toxic cobalt chloride. The benefits our method are...

Abstract Microplastics accumulate to various aquatic organisms causing serious health issues, and they have raised concerns about human by entering our food chain. The recovery techniques for the most challenging colloidal fraction even analytical purposes are limited. Here we show how hygroscopic nanocellulose network acts as an ideal capturing material tiniest nanoplastic particles. We reveal that entrapment of particles from aqueous environment is a result network’s nature - feature which...

Normally, the main purpose of vanes installed in slice chamber a hydraulic headbox is to control tensile strength ratio by affecting mean fiber orientation suspension. The use inherently leads formation peculiar vortex structures, referred here as coherent flow structures (CS), downstream flow. These CS are believed produce non-homogeneity paper. Although geometrically three dimensional, their machine direction (MD) and cross (CD) components dominant, cf. Kármán street, have distinctive...

Article Paper physics: Determination of local strains and breaking behaviour wet paper using a high-speed camera was published on August 1, 2011 in the journal Nordic Pulp & Research Journal (volume 26, issue 3).