The 3D printing process allows complex structures to be obtained with low environmental impact using biodegradable materials. This work aims develop and acoustically characterize 3D-printed panels three types of materials, each manufactured at five infill densities (20%, 40%, 60%, 80% 100%) internal configurations based on circular, triangular, corrugated profiles. highest absorption coefficient values (α = 0.93) were from the acoustic tests for polylactic acid material ground birch wood...

ABSTRACT In this article, poly(vinyl chloride) (PVC) sandwich‐structured hybrid composites with amorphous calcium carbonate and wood‐filled cores were obtained by compression molding. It has been determined that wood addition up to a weight ratio of 33% reported the total filler amount is beneficial in improving both inter‐filler filler‐matrix interfacial adhesion, which alongside promoting PVC matrix crystallization responsible for an increase 34% flexural strength composites, compared...

Sound-absorbing panels are widely used in the acoustic design of aircraft parts, buildings and vehicles as well sound insulation absorption areas with heavy traffic. This paper studied properties sound-absorbing manufactured three nozzle diameters (0.4 mm, 0.6 mm 0.8 mm) by 3D printing from types polylactic acid filaments (Grey Tough PLA; Black PLA Pro; Natural PLA) six internal configurations labyrinthine zigzag channels (Z1 Z2). The coefficient sample Z2 pattern, a 5.33 height, diameter...

Sustainable building materials with excellent thermal stability and sound insulation are crucial for eco-friendly construction. This study investigates biocomposites made from cellulose pulp reinforced beeswax, fir resin, natural fillers like horsetail, rice flour, needles. Eight formulations were obtained, their resistance, oxidation temperature, acoustic properties evaluated. Biocomposites exhibited significant improvements compared to conventional materials. Oxidation temperature onset...

The objective of this study was to investigate some the properties ash (Fraxinus excelsior L.) wood treated at a temperature 185 °C for 3 h. We tested samples’ physical properties, including their dimensional stability in form water absorption and radial/tangential swelling surface roughness, as well mechanical characteristics such Brinel hardness bending strength. Our results show that values samples improved, ranging from 27% 32% 21% 46%, respectively. Also, Brinell thermally registered...

The aim of this paper is to carry out a rheological study the pressing pine wood sawdust, after which obtaining briquettes from same material with hydraulic installation and analyzing their properties. In order know behavior during pressing, fractions resulting sorting sawdust 4 × 4, 3 3, 2 2, 1 mm2 sieves were used, respectively, six (the fraction larger than smaller one are added) specific device, placed on universal testing machine. results obtained in showed that density does not...

Fast-growing species have been increasingly developed in recent years, and among them, those cultivated to obtain combustible woody biomass shown rapid development. The purpose of this research study is highlight the properties briquettes pellets obtained from energetic willow compared oak biomass. Methodologies based on international standards were used find physical, mechanical, calorific two types pellets. results did not a significant difference between categories hardwood (energetic...

The first part of this paper is dedicated to obtaining 3D-printed molds using poly lactic acid (PLA) incorporating specific patterns, which have the potential serve as foundation for sound-absorbing panels various industries and aviation. molding production process was utilized create all-natural environmentally friendly composites. These composites mainly comprise paper, beeswax, fir resin, including automotive function matrices binders. In addition, fillers, such needles, rice flour,...

The aim of this study is to determine the effects heat treatment on some physical and mechanical properties beech plywood boards.The 3-layered boards with a thickness 3.9 mm were subjected for 1, 2 3 hours at temperatures 160, 180 200 °C.These tested such as density, water absorption swelling, property tests modulus rupture (MOR) Brinell hardness, mass loss rates according relevant standards.The results obtained show that hydrophobicity improved but strength weight are adversely affected,...

Large amounts lignocellulosic biomass in the form of straw is leftover after wheat harvesting that could be utilized for beneficial purposes. The latter has led to emergence new technologies make use this resource. One such technology currently turns into briquettes. In present study, we have prepared and evaluated physical, mechanical calorific properties two types briquettes made straw. were (i) hollow (ii) solid densities these obtained on a device with crank mechanism 1.169 kg/m3,...

The energetic fossil resources of the world have decreased drastically in recent decades, and quick efficient solution to replace them is use renewable biomass resources. This category also includes vegetable biomass, within it, sunflower seed shells an important contribution. present work aimed analyze pellets obtained from husks seeds, as lignocellulosic resulting production edible oil, for comparison, some beech sawdust were used. main physical properties (such moisture content, density,...

Torrefaction, a thermal treatment, was studied as means to increase calorific properties in sawdust biomass for some wooden species from southeast Europe. Torrefaction of wood material the form waste is known modify at chemical level, especially hemicelluloses. Four species, namely beech, spruce, larch, and oak, were thermally treated temperatures 200 °C, 220 240 260 280 300 °C different times 3 min, 5 10 min. The results indicated an value density with increased torrefaction temperature...

The paper aims to analyze and classified some exotic wood species from tropical Africa, on regard calorific features, in order view the ability of their biomass be a solid, natural renewable fuel. values wastes eight were determined using an oxygen bomb calorimeter. tested specimens conditioned at moisture content 10%, 20%, 50%. influence value density, heat release rate efficiency also analyzed. biggest high low obtained by Guaiac Rose (21200-20700 kJ/kg). Acajou had lowest (18929 18456...

The purpose of this work is to analyze heat-treated ash wood at temperature 185 ºC, in order its dimensional stability. For comparison, native ash/ not thermally treated wood, was be used. In some main properties such as water absorption, swelling thickness, roughness, Brinell hardness, modulus rupture and elasticity, color change toward black with CIELab space, many others were determined processed. results obtained after processing the experimental data have showed that had good physical...

The main purpose of this study was to find the optimal conditions for thermal treatment white wood pellets. Other goals were compare torrefied and pellets model process. Three types acquired from different manufacturing companies in pellet market, representing distinct species, at temperatures 160, 180, 200, 220 °C, 1, 2, 3 h. After treatment, properties treated determined, including their mass loss, calorific value, ash content, shear strength, compared with those non-torrefied value...

The paper aims to use the waste of sun-flower hulls in order obtain some lignocellulosic briquettes as renewable solid fuels. First, sunflower seed husks were ground, after that they sorted and only fractions corresponding pellets used. After obtaining stable there determined physical caloric properties manufactured from husks, potential alternative biofuels. moisture content, ash content density have been correlated with their calorific properties, namely value density. experimental results...

This study was done to determine the effects of beech sawdust torrefaction on pellets obtained in laboratory.Torrefied (Fagus sylvatica L.) used make pellets.This species chosen based existence a market for such micro-briquettes.Rigorous comparisons between torrefied and non-torrefied were conducted.It found that treating had both beneficial non-beneficial effects, but total effect is positive.Economical elements also considered, emphasizing use wood biomass as fuel.Theoretical experimental...

This research aimed to evaluate the calorific characteristics of two biomasses from larch and oak sawdust in form native or torrefied pellets. Some features these kinds biomasses, such as ash content, higher lower values, density many others were highlighted, allowing for a comparison between torrefied/not Installations methods used process torrefaction highlighting some also evaluated. As result experiments, it was demonstrated that pellets different terms density, but after thermal...

In a context where there is an increasing need for thermal treatments of wooden products, the current research contributes description torrefaction treatment two composite wood materials available on international market. The present paper presents importance process poplar plywood and medium-density fiberboard. this paper, positive aspects (decrease in water absorption, thickness swelling shrinkage, color) but also negative mechanical resistance to static bending are presented. Poplar (PW)...

Wooden hollow-core briquettes made of wooden waste represent an important category wood-based combustible materials used in heating chambers. This paper aims to determine some the characteristics these spruce and oak waste. The comparison classic types is order identify advantages disadvantages such briquettes. main are presented, starting from size, density, abrasion, compression ending with inferior superior calorific values, density ash content. obtained results show that there few...

The paper presents some forestry aspects of using Inger and Tordis willow clones to obtain woody biomass remedy degraded soils. methodological regarding the planting seedlings, evaluation survival rate, quantity enrichment soil are analyzed. results experiments showed that decreased viability rate cuttings by 16.6% for clone 35.8 clone. analysis samples it was enriched in nutrients after 2 years cultivation, decomposition fallen leaves on absorption substances from soil. Regarding amount...

Biomass is a natural vegetal component. As form of storing energy chemical sun, biomass one the most popular and universal resource on Earth. Today fuel can be used for various purposes from room heating to produce electricity cars. presented in energy, including biodegradable fraction products, remains waste agricultural, forestry industrial wood processing residues factories paste stationery paper, remnants industrial.

Wheat straw briquettes are high performance combustible products obtained by densification from the wheat biomass without use of additional adhesives or additives. The purpose paper is to analyze and detail physical properties (SR EN ISO / CEI 322 for moisture content method drying weighing, effective density according SR 323: 2005) calorific these (high low value ÖNORM M7135 using XRY-1C China Calorimeter ash ASTM D1102-84: 2013 18122: 2015) make a comparison between other wooden biomass....

In the industrial processing of logs, large amounts bark can be utilized as pellets. This study sought to establish conditions for efficient use bark, in form pellets, a solid, renewable fuel. First, physical properties (10% moisture content, 618-kg/m3densityfor aspen, and 749-kg/m3 density birch) pellets obtained from shredded were determined. Then, calorific (calorific value, density, ash content) native treated at 180 °C, 200 220 °C 1h, 2h, 3 h The sawdust samples that underwent...