Athanasios H. Grigoriou

• PhD
• Aristotle University of Thessaloniki

This paper investigates the basic hygroscopic properties and formaldehyde content (FC) of particleboards produced with wood biomass from fruit tree branches and evergreen hardwood shrubs as substitute raw materials for fir particles. One-layer laboratory particleboards with two distinct target densities (0.63 g/cm3 and 0.69 g/cm3) were produced usi...

This paper investigates the potential of utilising wood biomass from fruit tree branches and evergreen hardwood shrubs as raw materials in the production of particleboards when mixed with Greek fir wood particles. The main mechanical properties of the boards made therefrom were determined and compared with those made of typical industrial wood (IW)...

The objective of this study was to investigate the possibility of using waste paper recovered from old corrugated containers (OCC) as substitute for wood particles in the production of particleboards. Three proportions of wood chips: waste paper flakes (100:0, 70:30, 50:50) were used in the production of one-layer and the core of three-layer experi...

The aim of the present paper was to study the effect of some particle recovery parameters on the quality of hydrothermally recycled particleboards. The research was carried out in two phases: rough evaluation of various recovery parameters and determination of the recycled particleboard properties. It was concluded that the optimum group of hydroth...

The aim of the present paper was to study the effect of a hydrothermal recovery process on the acidity, chemical composition and formaldehyde emission of wood particles recovered from laboratory and waste particleboards. The hydrothermal treatments were carried out with saturated steam for 10min at a temperature of 150°C, after water impregnating o...

Recycling today constitutes the most environmentally friendly method of managing wood waste. A large proportion of the wood waste generated consists of used furniture and other constructed wooden items, which are composed mainly of particleboard, a material which can potentially be reused. In the current research, four different hydrothermal treatm...

Recycling today constitutes one of the environmentally most respectable methods of managing waste particleboards. Hydrothermally recycled particleboards in which no fresh particles are added illustrate downgraded hygroscopic and mechanical properties due to thermal degradation. In the current research formaldehyde emission of hydrothermally recycle...

Oriented Strand Board is a Wood Based Panel which, although well known and widely used in many European countries is a rather new product for the Greek market resulting to its reduced application and -sometimes- improper use. Consequently, information about OSB properties is essential for its acceptance and proper use. The aim of the present work w...

The effects, on the properties of recycled particleboards made from recovered wood particles, when subjected to four different hydrothermal board treatments (2bar/ 119°C/ 480min, 4bar/ 140°C/ 120min, 6bar/ 156°C/ 45min, 8bar/ 167°C/ 20min) were investigated in the present work. Furthermore, the impact of a 2nd recycling process on the properties of...

Waste paper could potentially be used as raw material for fiber- or particle-based composites without resorting, deinking and decontamination required for paper manufacturing. The objective of this study was the evaluation of one-layer boards made of various ratios (0:100,15:85, 25:75, 50:50, 75:25 and 100:0) of waste paper flakes to wood particles...

The vine has been a traditional cultivation in Greece for many years. Every February after pruning, large quantities of vine prunings remain as byproducts in the field, non-utilized properly. The average amount of prunings per year reaches ≈5 t/ha, which is higher than the average yield of forests in temperate zones. The aim of the present work was...

Castor (Ricinus communis L.) stalks, which are a readily available by-product of this plant mainly cultivated for seed production, derived from experimental plantations grown in Northern Greece during the period April–October 1996 were assessed for their suitability as feed stocks for direct substitution of wood in particleboard. The average stalk...

A kenaf (Hibiscus cannabinus L.) plantation grown in N.Greece during the period June-October 1996 provided the raw material for experimental particleboards. After harvesting, the kenaf stems were storaged under shelter for a week, the core of each stem was separated from bark and both were dried at about 20% and 10% moisture content, respectively,...

In order to study the feasibility of utilizing wheat straw as an alternative raw material for panels, experimental one-layer particleboards were produced by mixing straw with industrial wood particles in various proportions (100:0, 75:25, 50:50, 25:75, 0:100). Three different adhesive systems were used for blending the raw materials: a UF resin (E2...

SUMMARY From a kenaf plantation (Hibiscus cannabinus L.) established in North Greece, a number of stem sections were taken from three positions (base, middle and top) and cell morphology, anatomical appearance under SEM and basic technical properties were observed and determined. Kenaf plants had a maximum height of 2.53 m, with a mean basal diamet...

and that of other species varied from 0.71 to 0.75 g/cm3. For the species examined, the mean cell dimensions ranged between 0.606–0.911 mm for fiber length, 0.250–0.404 mm for vessel length and between 0.033–0.046 mm for vessel width. The greater cell dimensions correspond to apple and the shorter to apricot trees. The dichloromethane soluble extra...

Straw particles as raw material for the surface layers of particle-boards offer certain advantages compared to industrial wood particles: their production requires less costly chipping and drying equipment, they are thinner and have a higher length to thickness and compaction ratios-, UF resin is ineffective in bonding surface layers containing eve...

Extractives taken with hot water from bark ofPinus halepensis Mill. were used as basic adhesive components for exterior grade particleboards. In order to make the extract solutions sprayable onto the wood chips their viscosity was reduced by adding 15% ethanol (on extracts solids) to 40% concentration extract and by supplementary stirring and heati...

This study demonstrates the degree of improvement in flexural properties and dimensional stability of composite panels made with an oriented Strandboard (OSB) core overlaid with veneer. Composite panel type A consisted of 7/16-inch-thick OSB overlaid with 1/8-inch-thick southern yellow pine veneers on both sides with the veneer grain parallel to th...

Zusammenfassung Auf griechischen Obstbaum-Plantagen (Pfirsichbaum, Apfelbaum, Birnbaum, Kirschbaum, und Aprikosenbaum) fallen durch die jhrlichen Winterstungen bedeutende Mengen Astholzes an, die groeteils keine rationelle Verwertung findet. Zweck dieser Arbeit war es, die Eignung dieses Astholzes als Rohstoff fr Spanplatten zu untersuchen. In der...

Reines, nicht modifiziertes, sowie mit handelsüblichem Harnstoff-Formaldehydharz modifiziertes Pinus-halepensis-Tanninharz wurden als Bindemittel für einschichtige Laborspanplatten eingesetzt. Der Zusatz von 10% Harnstoff-Formaldehydharz im Tanninextrakt verbesserte die üblichen Spanplatteneigenschaften (Biege- und Querzugfestigkeit, Dickenquellung...

Zusammenfassung Ziel der Untersuchungen war es, einen genaueren Einblick in das Durchbiegungsverhalten von Holzwerkstoffen zu erhalten, die hufig als Einlegebden fr Mbel eingesetzt werden Zu diesem Zweck wurde die Durchbiegung von sechs Holzwerkstoffarten (Rohspanplatte, beschichtete Spanplatte, furnierte Spanplatte, Tischlerplatte, Furnierplatte u...

Abstract Es wurde die Formaldehydabgabe aus der Gesamtflche, den Schmal- und Breitflchen, verschiedener Holzwerkstoffe (Rohspanplatten, Spanplatten beschichtet mit Furnier und melaminharz-imprgniertem Papier, mittelharte Rohfaserplatten, Furnierplatten und Tischlerplatten) untersucht. Formaldehyd tritt nicht nur aus unveredelten sondern auch aus ve...

Extractives were taken from the bark of Pinus halepensis, using water, 1% NaOH and 5% NaOH (with and without sulfonation), with resultant extract yields higher for the NaOH extracts than for those with water only. The NaOH extracts, however, showed lower reactivity. 30 days' storage in liquid or solid form had little influence on their viscosity, p...

Zusammenfassung Die mechanischen und physikalischen Eigenschaften von handelsblichen mittelharten Faserplatten (MDF-Platten) und spanplatten wurden untersucht und gegenbergestellt. Die Untersuchung ergab wesentlich hhere Biegefestigkeits- und Abhebefestigkeitswerte fr MDF-Platten im Vergleich zu Spanplatten. Bezglich Querzugfestigkeit und Schrauben...

An dreischichtigen Holzspanplatten wurde sowohl der Einfluß der Deckschicht-Holzart als auch der Einfluß des Deckschicht-Mittelschicht-Anteils auf die Qualität der Deckschichten untersucht. Dazu wurden sieben Holzarten für die Deckschicht und zwei Deckschicht-Mittelschicht-Verhältnisse gewählt. Es zeigte sich, daß die Qualität der Deckschicht vorwi...

The particleboard waste constitutes in our days an important part of urban waste stream. The management of such waste already troubles the modern societies. Nevertheless, via recycling it is possible for this material to constitute a valuable resource for the production of new wood based panels thus helping on one part in the partial satisfaction o...