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 lignin (SWKL), soda wheat straw lignin (SoWhStL) and hydrolysis wheat straw lignin (HWhStL). Density, thickness swelling (TS) after immersion in water for 24 h, modulus of rupture (MOR), modulus of elasticity (MOE) and strength of internal bond (IB) of the board samples were determined. The amount (15% or 25%) and moisture content (MC) (18±1% or 5±2%) of the added lignin affected all the tested properties of the HDF except for density. However, the kind of the added lignin affects the obtained fibreboard more significantly compared to the control sample made without an admixture of lignin. In some cases, the tested values were diminished to half. The tested properties of the HDF samples produced with SoWhStL or HWhStL are compatible with standard requirements for medium-density fibreboard (MDF) for general use under dry conditions (EN 622-5, MDF), however, it depends on the lignin amount and MC.
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 compared between themselves and with the EU standards for fibre boards. A strong correlation of density and form stability under humid conditions with the lignin content is found. Results of testing mechanical properties of the boards suggest that effect of lignin on mechanical strength depends on the size of particles and hot‐pressing temperature. Steam explosion and hot‐pressing technologies tested in the study are shown to have potential of utilizing low‐quality wood and waste from forest industry to make value‐added products. Complementing a saw mill they represent a model of integrated technologies cluster in accordance with the concept of Zero Emissions facilitating environmental protection by reducing pollution and eliminating waste. Mixtures of commercial phenol‐formaldehyde resins containing 10% lignin by weight, tested as plywood binders under conditions of factory production, show satisfactory cohesion. Santrauka Ligninas, išgautas garo sprogdinimo būdu, atstoja rišamaja medžiaga medienos plaušo plokštese ir dedamas kaip dalinis pakaitalas i fenolformaldehido klijus, gaminant klijuotaja fanera. Tai beatliekes technologijos pavyzdys igyvendinant bendraja beatliekes gamybos koncepcija. Analizuojamos eksperimentiniu medienos plaušo plokščiu, kurioms naudota skirtingas lignino kiekis, savybes, palyginti su Europos Sajungos standartizuotu medienos plaušo plokščiu savybemis. Nustatyta gera eksperimentiniu plokščiu su lignino priedu tankio ir atsparumo vandeniui koreliacija. Bandymu rezultatai rodo plokščiu stiprio priklausomybe nuo medienos daleliu dydžio ir presavimo temperatūros. Išanalizavus akivaizdu, kad taikant minetaja technologija galima dideles pridetines vertes produktu gamyba iš nekokybiškos medienos ir medienos apdirbimo atlieku. Šiu technologiju taikymas lentpjūvese būtu integruotu technologiju grupes, veikiančios pagal beatliekes gamybos principa, pavyzdys. Bandant klijuotaja fanera, kuria gaminant kaip dalinis pakaitalas fenolformaldehido klijams paruošti naudojamas garo sprogimo procese išgautas ligninas, nustatyta patenkinama kohezija. Резюме Изучено применение лигнина, выделенного из древесной массы после парового взрыва, в качестве связующего компонента в древесноволокнистых плитах и добавки к фенолоформальдегидным клеям для производства многослойных фанер, что является примером безотходных технологических решений в рамках общей концепции безотходного производства. Сравнены свойства образцов плит, полученных горячим прессованием древесной массы с разным содержанием лигнина, и их соответствие техническим требованиям к изделиям. Обнаружена хорошая корреляция плотности и водостойкости плит с содержанием лигнина. Испытания механических свойств полученных образцов свидетельствовали о зависимости прочности от размера древесных частиц и температуры при прессовании. Использованные технологии выявили потенциальные возможности для создания ценных продуктов из низкокачественной древесины и отходов деревообработки. В дополнение к лесопильням они представляют собой образец кластера интегрированных технологий по принципу безотходного производства. Смесь фенолоформальдегидных смол, содержащих 10% лигнина, выделенного из древесной массы после парового взрыва, показывает удовлетворительную адгезию в условиях производства.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.