Production of innovative hemp based three-layered particleboards with reduced raw densities and low formaldehyde emissions

Schöpper, Christian; Kharazipour, Alireza; Bøhn, Christian

doi:10.1504/ijmpt.2009.027842

Cited by 15 publications

(7 citation statements)

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“…However, lowering the board density does not always go hand in hand with lowering the costs of their production. Although it was possible to introduce many raw material substitutes for natural wood (both plant waste and new species of trees and other plants), the mechanical properties of such products are not satisfactory and differ from those of conventional products [5][6][7][8]. In addition to new wood raw materials, new binders have been introduced, the resin content has been increased, and the density profile of the product has been optimised [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Low-Density Particleboards Modified with Blowing Agents—Characteristic and Properties

et al. 2022

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Although lightweight particleboards have been commercially available for years, they still have a number of disadvantages, including difficulty to process, brittleness, low impact strength, and other mechanical resistance. The aim of the paper was to determine the possibility of producing particleboards of reduced density (dedicated for furniture industry) as a result of using blowing agents from the group of hydrazides, dicarboxamides, or tetrazoles, which were modifiers of the adhesive resin used for bonding the particles of the core layer of three-layer particleboards. The concept presents the possibility of producing low-density particleboards in a standard technological process by modifying the adhesive resin, which has not been practiced by others until now. Analysis of the results of testing the particleboards properties with various types of modifiers (blowing agents), glue content (high 10%/12% and low 8%/10%), differing in glue dosing method, and different particle sizes allowed concluding that the most satisfactory effect was found in particleboards made of the variant modified with p-toluenesulfonyl hydrazide. This variant was characterised by the highest mechanical properties (bending strength, modulus elasticity, and internal bond strength) with high dimensional stability. The presented technology proposal can be applied in the industry.

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Section: Introductionmentioning

confidence: 99%

Low-Density Particleboards Modified with Blowing Agents—Characteristic and Properties

et al. 2022

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“…At present some agricultural residues such as wheat and rice straws, sorghum stalks and some annual plants such as hemp and jute are used as raw materials for pulp and paper production (Rousu and Anttila 2002;Ashori 2006;Schöpper et al 2009). Moreover numerous studies have been performed to introduce new lignocellulosic resources for paper and wood industries.…”

Section: Introductionmentioning

confidence: 99%

“…In the past this material was only used as litter in animal stables. Especially in these studies the sheaves are used to produce particle boards (Karus 2005;Ohlhauser 2005;Cescutti and Müssig 2005;Schöpper et al 2009). Today the goal of hemp farming is to use it for the production of wood composites (Karus 2005;Ohlhauser 2005).…”

Section: Introductionmentioning

confidence: 99%

Comparative properties of bagasse, canola and hemp particle boards

et al. 2010

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Residues of Bagasse (Saccharum officinarum L.), canola (Brassica napus L.) and hemp (Cannabis sativa L.) as well as industrial wood chips in various proportions from 0-100% were used as raw materials for the main component of the middle layer in urea formaldehyde bonded particle boards.The results reveal that most of the investigated mechanical-technological properties of the boards achieved the requirements of EN 312-2 (2003). Only increasing the percentage of canola chips usage in the middle layer to more than 30% negatively affect the internal bond (IB) properties. Comparing the water absorption (WA) and thickness swelling (TS) values, the boards containing up to 50% bagasse and hemp reach similar values to the ones of the reference boards, while increasing the amount of canola leads to more and more disadvantageous WA and TS.In summary, the results reveal that agri-fibers can be used for making composite panels conforming to the standards (EN 312-2 2003). One possible application for these panels could be the production of furniture. Einsatz von Ernterückständen von Bagasse, Rapsstroh und Hanfschäben bei der Herstellung von dreischichtigen SpanplattenThis article is dedicated to Gerd Wegener on the occasion of his retirement as professor at the Technische Universität München.

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“…More recently, options to use resin or natural starch-type binders have been explored to produce even more environmentally friendly composites and boards from hemp shives, rice husks, sunflower stalk, mycelium, and nut shells [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ]. Such development is due to rising prices of resources worldwide and the need for more locally supplied stock.…”

Section: Introductionmentioning

confidence: 99%

Production of Particleboard Using Various Particle Size Hemp Shives as Filler

et al. 2022

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Research was performed into the use of hemp shive as a fast-growing and carbon-storing agricultural waste material in the production of particleboard for the construction industry. Hemp shives were acquired and prepared for board production with the use of milling and sieving to reach two target groups with 0.5 mm to 2 mm and 2 mm to 5.6 mm particle size ranges. The cold pressing method was used to produce hemp boards with Kleiberit urea formaldehyde resin as a binder. The boards were made as 19 mm thick single-layer parts with a density range of 300 ± 30 kg/m3, which qualifies them as low-density boards. Exploratory samples were made using milled hemp fibers with higher density. Additional components such as color pigments and wood finishes were added to test improved features over raw board samples. Tests were performed to determine moisture contents, density range, structural properties, and water absorption amounts. Produced board bending strength reached 2.4 MPa for the coarser particle group and thermal conductivity of 0.057 ± 0.002 W/(mK). The results were compared with existing materials used in the industry or in the development stage to indicate options of developed board applications as indoor insulation material in the construction industry.

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Production of innovative hemp based three-layered particleboards with reduced raw densities and low formaldehyde emissions

Cited by 15 publications

References 0 publications

Low-Density Particleboards Modified with Blowing Agents—Characteristic and Properties

Low-Density Particleboards Modified with Blowing Agents—Characteristic and Properties

Comparative properties of bagasse, canola and hemp particle boards

Production of Particleboard Using Various Particle Size Hemp Shives as Filler

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