Ramunas Tupciauskas- Dr.sc.ing
- Researcher at Latvian State institute of Wood chemistry
Ramunas Tupciauskas
- Dr.sc.ing
- Researcher at Latvian State institute of Wood chemistry
About
51
Publications
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Introduction
Ramunas Tupciauskas currently works at the Biorefinery Laboratory, Latvian State institute of Wood chemistry. Ramunas does research in Wood and Agricultural Plant Science, Engineering and Biocomposites Science. The current project is 'Processing of birch bark into ecological fibre biocomposites and value added products'. Engineering and testing of biocomposites in the form of panels: water swelling/absorption (EN317), MOR/MOE (EN310), IB (EN319), etc.
Current institution
Additional affiliations
July 2020 - October 2020
Education
October 2009 - May 2013
Publications
Publications (51)
This study investigates the fire resistance capabilities of newly developed loose-fill thermal insulation materials crafted from annual plants such as wheat straw, corn stalk, and water reed. Three processing methodologies were employed: mechanical crushing (raw, size ≤ 20 mm), chemi-mechanical pulping (CMP) using 4% sodium hydroxide, and steam exp...
The present study evaluates the mold fungal resistance of newly developed loose-fill thermal insulation materials made of wheat straw, corn stalk and water reed. Three distinct techniques for the processing of raw materials were used: mechanical crushing (Raw, ≤20 mm), thermo-mechanical pulping (TMP) with 4% NaOH and steam explosion pulping (SEP)....
The present study evaluates mold fungal resistance of newly developed loose-fill thermal insulation materials from wheat straw, corn stalk and water reed. Three different processing methods of raw materials was performed by mechanical crushing (Raw, ≤ 20 mm), thermal-mechanical pulping (TMP) using 4% NaOH and steam explosion pulping (SEP). An admix...
Lignocellulosic biomass (LCB)-based thermal insulation materials available in the market are more expensive than conventional ones and consist mainly of wood or agricultural bast fibers which are primarily used in construction and textile industries. Therefore, it is crucial to develop LCB-based thermal insulation materials from cheap and available...
Bone fractures and bone defects affect millions of people every year. Metal implants for bone fracture fixation and autologous bone for defect reconstruction are used extensively in treatment of these pathologies. Simultaneously, alternative, sustainable, and biocompatible materials are being researched to improve existing practice. Wood as a bioma...
Some industrial crops residuals like wheat straw, buckwheat husks and reeds were used in the study as raw lignocellulosic materials to evaluate their potential as thermal insulation material. Steam explosion (SE) pre-treatment was used to disrupt and convert the raw material smooth shape to foamy fibrous shape. Two level Factorial design was used t...
Kraft cooking of juniper wood with NaOH/Na2S aqueous solution has been used in the study for partial delignification at the temperature of 165°C for different residence time (0-40 min) following by thermal compression for densification under a pressure of 5 MPa at 100°C for 24 hours. The densified and natural juniper wood samples were characterized...
Climate change policy (European Comission, 2021) and the rising cost of energy resources force to look for new eco-effective thermal insulation materials. Although various thermal insulation materials are available on the market, 90% on the global market share are made from non-renewable materials, like plastic-or mineral-based fibres and foams (As...
An attempt to reduce, replace, or even eliminate the synthetic resins from wood-based panels alongside broadening the array of raw lignocellulosics is still essential and attractive. Many pretreatments of lignocellulosics have been studied, among which steam explosion (SE) resulted in superior physical-mechanical properties of the obtained binder-l...
Toxic formaldehyde emissions, and the necessity to reduce the consumption of petrochemicals, stimulates the development of environmentally friendly adhesives. The aim of this research was to study, for the first time, the possibility of using condensed tannins (CTs)-rich extracts from grey alder (Alnus incana) and black alder (Alnus glutinosa) bark...
In the current decade, based on the European Green Deal, new challenges of the wood-based panel industry have arisen, seeking for formaldehyde-free bio-based adhesives and broadening raw lignocellulosics. In order to contribute to the potential solution to the challenges, binder-less boards of steam-exploded (SE 220 °C/2 min) hemp shives and wheat...
Silver birch (Betula pendula) outer bark suberin can be used as a raw material to make an adhesive for particleboards (PBs). It is a promising formaldehyde-free alternative to traditional synthetic resins. However, the adhesive is acidic, which can catalyse furfural (FUR) formation from xylans in wood particles that are used for the preparation of...
The development of lignocellulosic-based binder-less boards is looking for suitable agricultural industrial crops to at least partially substitute wood making new composites without hazardous synthetic adhesives. The study aims a development of medium density binder-less boards from steam-exploded hemp (Uso31) shives and wheat straw; these crops ar...
Non-catalysed steam explosion (SE) pre-treatment was used to valorise agricultural residues of hemp shives and wheat straw obtaining fibre bundles with self-bonding property. Three industrial hemp varieties of Futura75, Uso31 and Finola were used in the study. The crops were pre-treated at SE conditions temperature (℃)/time (min) of 200/1, 200/3, 2...
Huge amounts of synthetic binders and polymers are used for the production of wood-based composites which are toxic to humans during the production and exploitation of products because of the risk of harmful vapor emissions. The bio-based society requires new value chains for the production of bio-based materials. Suberinic acids (SA) have a high p...
Steam explosion (SE) is one of the competitive technologies successfully introduced in the biorefinery platform capable to disrupt a lignocellulosic raw material to fibrous biomass with a self-bonding property. A huge quantity of agricultural residues like straw and woody shives are still available to be converted to value added products. The SE pr...
![Characteristics of the Lignins Used [36]](profile/Ramunas-Tupciauskas/publication/350212006/figure/tbl1/AS:1004178566565891@1616426235410/Characteristics-of-the-Lignins-Used-36_Q320.jpg)
Particleboards based on a mixture of grey alder (Alnus incana (L.) Moench) wood particles (sieve fraction
0.4-2 mm) and 15 or 25% of lignin powder obtained by hot pressing from four different industrial sources were
investigated. Their density, thickness swelling, water absorption, modulus of rupture, modulus of elasticity in
bending, and intern...
Wood-based panels (WBP) comprise a considerable part in the output of the European wood industry, GDP, and export. Over 30% of fibreboards and about 50% of other boards used in constructions and carpentry are produced in Europe. Industrially produced WBP contain synthetic adhesives determining mechanical properties and being made from oil are often...
Steam explosion (SE) pre-treatment was carried out for all raw materials (fraction 0.5-10 mm) at temperature range 200-240℃ during 1-3 min. Binder-less boards were fabricated from milled (sieve 2 mm) SE materials (fraction 0.05–2 mm) at a constant temperature of 175℃ and pressing rate of 1 min/mm at the density level of 900 kg/m3. The obtained boar...
In this study, the effect of the catalyzed pretreatment process parameters on the composition of the residue from birch plywood production-veneer shorts and bark-was studied. It is known that aluminum sulfate is less aggressive than the conventionally used catalyst-sulfuric acid. This suggests that the C-6 carbohydrates in the raw material could be...
The aim of this study is to determine the optimal aluminum sulfate catalyzed hydrolysis parameters for furfural production from birch inner bark using a central composite design coupled with the response surface methodology. The conditions of hydrolysis such as temperature (165-175 °C), catalyst concentration (12-16 %), catalyst amount (6-8 %), ste...
The main objective of the study was to obtain bio-composites from grey alder sawdust using a mixture of birch outer bark suberinic acids as a binder, and to test their mechanical properties. Ethanol-extracted birch outer bark was used as a raw material for the investigation. Characteristics (suberinic acids content, epoxy acids content and acid num...
Steam explosion (SE) is a well renowned pre-treatment method used for bio-refined material synthesis due to its simplicity in machinery and efficiency in resource and energy use in creation of high-value products. Used for separation of lignocellulose originated from wood and other sources, current research in wood-based lignocellulose has mainly f...
The preparation of self-binding lignocellulosic fibreboards has been investigated. Different high-density fibreboards (HDF) were hot-pressed based on a mixture of grey alder (Alnus incana L. Moench) wood chips processed by steam explosion auto-hydrolysis (SE) and 15% or 25% lignin content from three different industrial sources: softwood kraft lign...
The study of converting grey alder (Alnus incana) chips and silver birch (Betula pendula) flakes – residues from plywood manufacture – into blow-in insulation material by steam explosion (SE) is reported. The SE was conducted at temperatures between 200 and 235°C, for 0–5 min at pressures between 16 and 32 MPa. The severity parameters (logR0) of th...
Internet source for readers: http://www.rfbr.ru/rffi/ru/libsearch/o_1954399
For the first time a dependence of the technical lignin extractive substances yields on duration of steam-explosion treatments is investigated. Chemical composition of the extractive substances is analyzed by means of gas chromatographymass spectrometry method with the use...
Commercially, furfural is produced from pentosan-rich biomass using mineral acids as homogeneous catalysts. This study investigated a novel hydrolysis method that allows to obtain furfural from hemp shives with high yield and also to preserve the cellulose in the remaining biomass for other bioconversion processes. To date, hemp shives have not bee...
In the last two decades intensive grow of industry of building materials from renewable resources is observed. Such situation is related to some aspects: global warming, environmental pollution, impact on human health, environmental impact of materials at their end-of-life.
In current study development of thermal insulation materials from hemp and...
The objective of the study was to investigate the preliminary technological parameters for obtaining furfural and binder-less panels depending on hydrothermal pre-treatment temperature, steam explosion treatment and pressing conditions. If the pretreatment temperatures were 160–180 °C and the time 90 min, the yield of furfural was 64.8–67.2 % from...
![Fig. 1. Wood cell changes after SE processing [5].](profile/Martins-Andzs/publication/281367427/figure/fig1/AS:613949519183893@1523388380477/Wood-cell-changes-after-SE-processing-5_Q320.jpg)
The study shows development of an innovative bulk heat insulation material from grey alder (Alnus incana L. Moench) chips and birch (Betula pendula, Betula verrucosa) flakes as residues of plywood production. The research is actual for the plywood production companies and for producers that process grey alder chips to make an innovative products wi...
Due to their high amount of pentosans, hemp (Cannabis sativa L.) shives are suitable for the production of furfural-a platform chemical. However, after the catalytic hydrothermal pre-treatment process, 60-85 wt% of lignocellulose (LC) is leftover, which also requires a rational utilization to realize the biorefinery concept. In this study, the poly...
In Latvia industrial hemp cultivation is rapidly growing. A study of binderless panel made from hemp (Cannabis sativa L.) shives after hydrothermal pretreatment and steam explosion treatment is reported. The acoustic properties of the panels were determined by means of the sound absorption coefficient (αw) determined according to standards ISO 1053...
A study of self-binding fibreboards pressed without synthetic adhesives is reported. The board samples of steam-exploded grey alder (Alnus incana L. Moench) particles hot-pressed under a variety of conditions including moisture content of the mat (8% and 12%), temperature (150°C, 160°C, 170°C and 180°C) and pressure (0.2–8 MPa) are tested for moist...
Depletion of world recourses, increasing pollution, and climate change make us to shift from linear economy to system economy—an economy of technologies integrated to reach a system of non-polluting zero emissions production. Transition to renewable resources requires replacing the present crude oil refinery by biomass refinery. Along with conventi...
The structural changes induced in fiber lignin by steam explosion was studied to better understand the effect of steam explosion conditions on bonding mechanisms of lignin containing fibers in self-binding fiber boards. In all the steam exploded lignin samples, the main lignin inter-unit linkage after 1 min treatment was the β–O–4´ alkyl aryl ether...
Abstract. Experimental self-binding high-density fibreboard is produced of the grey alder (Alnus incana L. Moench) steam-exploded fibres without addition of synthetic adhesives. Milled grey alder chips are processed in steam-explosion unit by saturated steam under pressure of 3.2 MPa at temperature of 235 °C for 1 min in a 0.5 l batch reactor. The...
Abstract
Steam explosion pre-treatment of bi
omass presents one of advanced
techniques for transformation and
functionalization of the components
of natural polymers and allows to
extract easily hemicelluloses and
destructed fragments of lignin from the processed mass.
Depending on the treatment severity, the fibres of
cellulose are reduced t...
A batch steam explosion pretreatment (SE) was applied to grey alder (alnus incana (L.) Moench) chips to obtain self binding fibrous lignocelluloses’ complex. SE was generated by water vapours without any chemical catalyst. The structural impact of SE on the chips investigated by such aspects as: mass loss (depending on severity of SE, moisture and...
The present study is aimed at obtaining self-binding (without any additional binders) medium density board samples from steam-exploded grey alder (alnus incana (L.) Moench) chips. The chips used for steam explosion pre-treatment (SEP) were fractionated by crushing to different size from 0.4 mm to 20 mm. The SEP was done in a batch reactor at consta...
Self-binding high-density fibreboard is formed using grey alder (Alnus incana L. Moench) steam-exploded (SE) fibres without addition of synthetic adhesives. The self-binding high-density grey alder fibreboard and birch (Betula Pubescens) plywood with application of SE lignin shows sufficient mechanical properties comparing to commercial composites...
A study demonstrating the approach of zero‐waste technologies, a component of the Zero Emissions concept, and using lignin extracted from steam‐exploded wood as adhesive in hot‐pressed fibre boards and plywood to substitute phenol‐formaldehyde resins is reported. Properties of sample boards containing different amount of lignin adhesive are compare...
Experimental self-binding high-density fibreboard is produced of the grey alder (Alnus incana L. Moench) steam-exploded fibres without addition of synthetic adhesives. Milled grey alder chips are processed in steam-explosion unit by saturated steam under pressure of 3.2 MPa at temperature of 235 °C for 1 min in a 0.5 l batch reactor. The steam-expl...
Manufacturing of wood-based panels takes sufficient place in wood processing industry around the World. An application and demand for such materials has been growing up. Wood-based panels are competitive with other plate materials. Wood fibreboard represents 25 % of manufacturing of all the wood-based panels in Europe. Usually synthetic adhesives a...
Properties of self-binding and binder-less board samples of grey alder (alnus incana) wood are reported. The self-binding materials are obtained by steam explosion auto-hydrolysis (SEA) treatment of alder wood at 235 ºC temperature and 3.2 MPa pressure and fractioning of the exploded mass. Binder-less material have been prepared of raw shredded ald...
Questions
Question (1)
Hello! I am implementing Post-Doctoral project titled "Investigation of binder-less fibreboards made of steam-exploded wheat straw and hemp shives" where one of the outcomes must be a mobility measure at abroad scientific organisation. The goal of the mobility is training on and determination/characterization of volatile organic compounds (VOC) of wood-based panels (WBP) including binder-less fibreboards obtained from pre-treated hemp shives and wheat straw.
Please advise me which Scandinavian organisations having a deal on VOCs of WBP?
Thanks in advance!
