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Publications (57)
Twin-screw extrusion has recently seen its uses extended to the continuous green extraction of biomolecules. Here, it was successfully used for the extraction of antioxidants using subcritical water from two olive co-products, i.e., leaves (OL), and leaves plus branches (OLB). Extraction yields obtained were 52.5 % and 65.6 %, respectively, in prop...
In view of improving the circularity and sustainability of crop production, sunflower by-products were extracted using twin-screw extrusion (TSE) to produce sunflower extract, a plant biostimulant that alleviates plant shoot development under salt stress conditions. The TSE process is a thermo-mechano-chemical pre-treatment method for the separatio...
This study was carried out to investigate the continuous aqueous pretreatment of sugarcane bagasse (SCB) through twin-screw extrusion for a new integrated full valorization, where the solid residue (extrudate) was used for the production of bio-based materials by thermocompression and the filtrate for the production of high-value-added molecules. T...
This paper deals with the development of bio-based thermal insulation panels from sunflower pith particles, which are an agricultural by-product, in the view to compete with the current petroleum-based counterparts. Sunflower pith is glued to a native starch, then moulded and dried. Three different starchy binders were tested: potato starch, wheat...
Sunflower co-products (i.e., stalks and heads) were recently used to create a value chain of sunflower biomass. On the one hand, bioactive ingredients extracted through twin-screw extrusion can be valorized as ecologically friendly agricultural products. On the other hand, in this study, the remaining solid, i.e., the extrudate, was used for obtain...
The coriander press cake is the co-product obtained during the mechanical pressing of the seeds through twin-screw extrusion, a continuous operation that produces a fragrant vegetable oil now used in cosmetics and nutraceuticals. Due to its high protein content (27%), thermoplastic and adhesive properties, and high lignocellulose content (36%), it...
SAVASCO est un projet INTERREG V-A Espagne-France-Andorre (POCTEFA 2014-2020), qui vise à structurer une filière de construction innovante et éco-efficiente à base de tiges de maïs et de tournesol. Implantée sur le territoire transpyrénéen, le projet doit permettre de contribuer à la réduction des impacts environnementaux du secteur du bâtiment. Le...
Due to the ever-growing demand for bast fibres for technical and garment textiles, complementary sources to textile flax, whose cultivation in western Europe cannot really be extended, need to be proposed. In this study, the interest in harvesting and processing linseed flax straw is studied for geotextile applications. The main critical stages of...
This work compares the performance of pellets for adult Trout obtained in two different processing conditions. The first one consists of adopting the traditional Fish Feed process based on a preconditioning steam treatment step before twin-screw extrusion. The second one was a simplified process based only on a twin-extruder ensuring both the cooki...
L'invention concerne un produit pour l'agriculture ainsi que son procédé de fabrication, ledit produit étant solide, délitable et comprenant au moins un ingrédient actif pour l'agriculture et une matrice à base d'une matière d'origine végétale, ladite matrice ayant une teneur en protéines végétales d'au moins 30% en poids par rapport au poids sec d...
Co-product of sunflower cultivation, pith of stem has a little exploited insulating potential. Blocks in which pith particles are glued together using a starch-based binder have already been obtained. However, they are highly water-sensitive. Replacing this binder with others has been considered here. Polysaccharide-based binders were tested, chose...
Linseed flax is a multipurpose crop. It is cultivated for its seeds and particularly for its oil. The main contributors for this crop are Canada, France and Belgium. In general, straws of linseed flax are buried in the fields or burnt. However, these solutions are not good practices for the environment and from an economical point of view. In this...
This work was conducted to investigate the potential of fibers extracted from linseed flax straw for geotex-tile applications. Four different batches of linseed flax were studied, having different dew retting durations (i.e., from 0 to 14 weeks). Furthermore, a method comprising horizontal breaker rollers, a thresher and then a breaking card was us...
Nowadays, amaranth appears as a promising source of squalene of vegetable origin. Amaranth oil is indeed one of the most concentrated vegetable oils in squalene, i.e., up to 6% (w/w). This triterpene is highly appreciated in cosmetology, especially for the formulation of moisturizing creams. It is almost exclusively extracted from the liver of shar...
A versatile twin-screw extrusion process to provide an efficient thermo-mechano-chemical pre-treatment on lignocellulosic biomass before using it as source of mechanical reinforcement in fully bio-based fiberboards was developed. Various lignocellulosic crop by-products have already been successfully pre-treated through this process, e.g., cereal s...
Controlled-release fertilizers (CRF) are needed under current agriculture practice to decrease the environmental impact caused by fertilizer doses applied in excess of plants’ uptake rate. Commercial CRF are available. They are manufactured from mineral fertilizers encapsulated into a synthetic polymer matrix or coated by a polymer layer. However,...
Nowadays, amaranth appears as a promising source of squalene of vegetable origin for the cosmetic industry. Squalene represents up to 6% (w/w) of oil from seeds. It can be isolated from vegetable oil for subsequent use. This triterpene is highly appreciated in cosmetology, especially for the formulation of moisturing creams. Indeed, it has the abil...
This work describes a process approach to study the oil leakage phenomenon in feeds for large Trout. Using a pilot vacuum coater, four experimental coating parameters were studied (stirring speed, pressure, filling rate, and time needed to restore atmospheric pressure) through an experimental design. The properties measured on the coated pellets we...
Straw represents 60-80% of the aerial part of the coriander plant. Because of the increasing demand for vegetable oil from fruits for food, cosmetics or the chemical industry, the availability of straw will grow strongly in the future. Its high lignocellulose content (62%) makes this crop by-product an interesting raw material for producing bio-bas...
Amaranthus cruentus is a promising raw material for the biorefinery of whole plant. Stems are composed of (i) a bark on their periphery (76% w/w), and (ii) a pith in their middle (24% w/w). Both are usable for material applications. It is possible to separate mechanically and continuously these two fractions thanks to a fractionation process develo...
This work assesses the potential of nettle (Urtica dioica L.) fibers produced on contaminated lands for composite applications. The nettles studied in this work grew spontaneously and in a prevalent manner in poplar short rotation coppice planted for the phytomanagement of a land contaminated by traces of metals. Results show that the contaminant c...
Flax (Linum usitatissimum L.) has been grown since the antiquity for tis ability to provide fibres for the confection of clothes. It has also been used for the production of technical fabrics such as sails for example. In the 20th century, and particularly in Europe, the vegetal fibres such as flax were progressively replaced by synthetic fibres fr...
In western Europe, hemp is mainly cultivated for the seeds and the fibre rich straws, randomly aligned following the harvesting with a combine harvester. The straws are mainly valorised for low added value products such as pulp for paper and for insulation. They are also valorised in low property short fibre composites. With the view to use hemp fi...
Cultivated primarily for its seeds, oleaginous flax could also be valued for the different fractions that can be extracted from the straw. However, as the straws are not harvested with the same technique and care than for the textile flax, the classical scutching technique cannot be used. As a consequence, an “all fibre” device was used to perform...
In this study, fiberboards were produced from shives collected after continuous fiber mechanical extraction from oleaginous flax straw. Fiberboards were produced through thermo-pressing, and their mechanical and thermo-mechanical properties were studied, as well as their water resistance. The influence of one pretreatment for shives and lignin addi...
This work assesses the potential of stinging nettle (Urtica dioica L.) growing on trace element contaminated soils to produce fibres for material applications. The nettles studied in this work grew spontaneously and dominated the vegetation cover in poplar short rotation coppices planted for the phytomanagement of lands contaminated by trace elemen...
This work of a preliminary nature has for goal to investigate the potential of the linseed flax straw for industrial valorization in technical textiles. The impact of two extraction systems (“all fiber” extraction device and a scutching/hackling device) was investigated. In a first part of the paper, it was demonstrated that it is possible to extra...
Straw represents 60-80% of the aerial part of coriander. It is cheap (90 €/ton including harvesting, bunching and transportation) and has an availability of 250 tons/year. However, the latter will grow strongly in the next five years due to the increasing use of vegetable oil from the fruits for food, cosmetics or the chemical industry. Due to its...
Amaranth is an annual herb native to temperate and tropical regions. Cultivated by Native Americans for the nutritional properties of its seeds, the latter are very digestible and also an interesting source of starch and proteins. For the future, amaranth appears as a promising raw material for the biorefinery of whole plants, all parts of the plan...
Amaranth is an annual herb native to temperate and tropical regions. It is a promising raw material for the biorefinery of whole plants. Looking at the large amounts of starch, proteins and squalene inside its seeds, the latter could find applications in many fields like
the food, cosmetics and material industries. This study specifically investig...
The development of materials based on renewable and low-cost resources is today’s crucial interest for civil engineering. This work intends to investigate two new vegetable fibers as composite reinforcement for insulation application in the building industry. Miscanthus and sunflower stalk have mainly been selected for their high fiber content, low...
Dans cette étude, des panneaux agglomérés de fibres ont été produits à partir d’anas collectés après extraction mécanique des fibres libériennes de paille de lin oléagineux. Les panneaux ont été mis en œuvre par thermopressage. Leurs propriétés mécaniques et thermo-mécaniques ont été étudiées ainsi que leurs comportements vis-à-vis de l’eau. L’infl...
Cultivé principalement pour ses graines, le lin oléagineux pourrait également être valorisé pour les différentes fractions végétales qui peuvent être extraites de la paille. Cependant comme les pailles ne sont pas récoltées avec la même technique et le même soin que pour le lin textile, la technique classique de teillage ne peut pas être utilisée....
The objective of this study was to investigate the influence of fiber morphology and molding parameters on the mechanical and physical properties of fiberboards made from rice straw. The rice straw was thermomechanically treated with a twin-screw extruder. Three parameters were investigated: the amount of water added at molding (0–20%), lignin cont...
Biomaterials are an alternative to non-renewable materials. Hemp shives allowed developing an industrial sector favorable to sustainable development. Hence, hemp concrete is currently used as filling material in a timber frame (cast onsite, sprayed or precast). Nevertheless, hemp shiv, the reference biobased aggregate, has a limited availability. I...
In this study, coriander straw fiber was effectively incorporated as a reinforcing filler in polypropylene and biobased low-density polyethylene composite materials through twin-screw extrusion compounding and injection molding. Maleic anhydride-grafted copolymers were added as a coupling agent and effectively provided fiber/matrix compatibilizatio...
In this study, fiberboards were produced from shives collected after continuous fiber mechanical extraction from oleaginous flax straw. Fiberboards were produced through thermo-pressing, and their mechanical and thermomechanical properties were studied, as well as their water resistance. The influence of two pretreatments for shives and lignin addi...
Cultivated primarily for its seeds, oleaginous flax could also be valued for the different fractions that can be extracted from the straw. However, as the straws are not harvested with the same technique and care than for the textile flax, the classical scutching technique cannot be used. As a consequence, an “all fibre” device was used to perform...
The present work compares two different pretreatment technologies, i.e. twin-screw extrusion, and steaming digestion plus defibration, for producing a thermo-mechanical pulp from rice straw for fiberboard manufacturing. Five liquid/solid ratios from 0.43 to 1.02 were tested for twin-screw extrusion pretreatment, while liquid/solid ratios from 4 to...
Poly(vinyl alcohol-co-ethylene) was compounded with 2e10% post-harvest tomato (PHT) plant powder and processed by single-screw extrusion to yield composite films. Upon increasing the filler content, the values of the mechanical properties indicators were found to decrease as follows: Young's modulus from 1797 to 750 MPa, stress at yield from 36 to...
The aim of this study consisted of manufacturing renewable binderless fiberboards from coriander straw and a deoiled coriander press cake, thus at the same time ensuring the valorization of crop residues and process by-products. The press cake acted as a natural binder inside the boards owing to the thermoplastic behavior of its protein fraction du...
Post-harvest tomato plants were used to manufacture fireboards by thermopressing. Four plant materials were
investigated: exhausted tomato plants ground to 5-10 mm (PHTr), tomato (PHT) and maize (PHM) plants ground to <0.5 mm, composted tomato plants (CPHT). These materials had significantly different chemical composition, which significantly influ...
A deoiled press cake resulting from twin-screw extrusion of coriander fruits was used as a raw material for the production of self-bonded boards. The operating parameters for thermopressing were varied and include the applied pressure (19.6–39.2 MPa), molding time (60–300 s), and molding temperature (155–205 °C). The optimized process conditions (2...
Biorefinery of sunflower whole plant was performed successfully using a thermo-mechano-chemical twin-screw reactor. This led to the aqueous extraction of oil and other biopolymers like proteins, pectins and non pectic sugars. It resulted in the overall fractionation of biomass, thus allowing a complete valorization of the input. This biorefinery pr...
Single-screw extrusion allows obtaining composite films containing poly(ethylene-co-vinyl alcohol), hereinafter EVOH, and water-soluble lignin-like biopolymers (SLP) isolated from the alkaline hydrolysate of two materials sampled from an urban waste treatment plant. During extrusion, a condensation reaction occurs between the EVOH and SLP. The prod...
Biorefinery for Food, Fuels and Materials 2015 symposium - BFFM 2015, 15 June 2015 - 17 June 2015 (Montpellier, France)
The objective of this study was to manufacture new biodegradable fiberboards by thermo-pressing. The starting material was deoiled cake (only 0.9% oil content), generated during the biorefinery of sunflower (Helianthus annuus L.) whole plant in a co-rotating twin-screw extruder. All fiberboards were cohesive mixtures of proteins and lignocellulosic...
The aim of this project was to create a sandwich composite material from renewable sources combining good mechanical and thermal insulation properties. To this end, polyamide 11 (PA 11) was used as matrix and jute fiber as reinforcement. The PA 11 is a thermoplastic polymer from renewable sources, made from castor oil, known for its properties agai...
New insulation fiberboards from sunflower cake with improved thermal and mechanical properties were produced by pressing at ambient temperature. Best compromise between mechanical and heat insulation properties (λ = 77.6 mW/m K at 25°C) was a starch-based board with 20% binder content. Because of its promising heat insulation properties, this new f...
Electrically controllable glasses can be used to control daylight and solar energy in buildings and in automotives in order to improve quality of life and to save energy spent on lighting, cooling and heating. The paper discusses the case of switchable glazings using liquid crystal/polymer micro-composites. A comparison with other technologies (lik...
