Molding of wood powder with a natural binder

Kajikawa, Shohei; Horikoshi, Masaya; Tanaka, Soichi; Umemura, Kenji; Kanayama, Kozo

doi:10.1016/j.proeng.2017.10.747

Cited by 7 publications

(5 citation statements)

References 4 publications

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“…It can be effective to add sugar as a wood powder binder to improve its thermal fluidity. Kajikawa et al (2017) carried out a fundamental investigation on the injection moldability of wood powder with the sugar sucrose, and they confirmed that adding sucrose improves the moldability and thermal fluidity. Further enhancement of the thermal fluidity is needed for stable production without molding defects.…”

Section: Introductionmentioning

confidence: 80%

Fabrication of naturally derived wood products by thermal flow molding of wood powder with sucrose and citric acid

Kajikawa

Horikoshi

Kuboki

et al. 2020

BioRes

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Thermal flow molding of wood powder was carried out with a natural binder consisting of sucrose and citric acid (SC binder) for fabricating wood products without synthetic resins. The testing of thermal flow and molding of the wood powder with SC binder was done to analyze the effect of added SC binder, as well as to optimize the molding conditions, such as temperature, binder content, and mixture ratio of the sucrose and citric acid. The wood powder with SC binder flowed successfully at an optimum temperature of 180 °C in the thermal flow test. In addition, it was possible to form a composite wood plate by molding with thermal flow, and the moldability was improved by increasing the sucrose ratio in the SC binder. Density, bending strength, and thickness swelling after water immersion of the plate molded under the optimum molding conditions were 1.4 g/cm3 to 1.5 g/cm3, 28 MPa to 37 MPa, and 7% to 10%, respectively. These results indicated a possibility

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Section: Introductionmentioning

confidence: 80%

Fabrication of naturally derived wood products by thermal flow molding of wood powder with sucrose and citric acid

Kajikawa

Horikoshi

Kuboki

et al. 2020

BioRes

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“…There are important criteria for these feedstock, for example, low density, strength properties, flexibility and cost effectiveness are the main criteria for using wood powder in composite products [120]. The binding agents of wood powder composites are adhesive i.e., UF (urea formaldehyde) [117,[121][122][123][124][125], epoxy-resin [126], PF (phenol formaldehyde) [127,128]; thermoplastic i.e., polyethylene, polypropylene, polystyrene, polyvinyl chloride, polyethylene-terephthalate [108,113,118,120,[129][130][131][132][133][134][135][136][137][138][139][140][141]; natural adhesive [142,143] and Portland cement [144][145][146][147][148][149][150][151]. There is no need for binding agents in particleboards from wood powder [152].…”

Section: Raw Materials For Compositesmentioning

confidence: 99%

Production and characterisation of pine wood powders from a multi-blade shaft mill

Das¹

2023

Acta Universitatis Agriculturae Sueciae

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Wood is an important raw material for the manufacture of consumer products and in achieving societal goals for greater sustainability. Wood powders are feedstock for many biorefining and conversion techniques, including chemical, enzymatic and thermochemical processes and for composite manufacture, 3D printing and wood pellet production. Size reduction, therefore, is a key operation in wood utilisation and powder characteristics, such as shape, particle size distribution and micromorphology play a role in powder quality and end-use application. While in a green state, the native chemical composition and structure of wood are preserved. Powders are commonly produced from wood chips using impact mills, which require pre-sized, pre-screened and pre-dried chips. These steps necessitate repeated handling, intermediate storage and contribute to dry matter losses, operation-based emissions and the degradation of the wood chemistry. This thesis investigated a new size reduction technology, known as the multi-blade shaft mill (MBSM). The MBSM performance was studied through the milling of Scots pine (Pinus sylvestris L.) wood using a designed series of experiments and through modelling with multi-linear regression (MLR) analyses. Light microscopy combined with histochemical techniques were used to investigate particle micromorphology and distribution of native extractives in powders. The aim was to evaluate the technical performance of the MBSM with relation to operational parameters, to characterise the produced powders and to evaluate the technology through comparison with impact milling. The results showed that the MBSM could effectively mill both green and dry wood. Produced powders showed distinct differences compared to those obtained using a hammer mill (HM). The specific milling energy of the MBSM was lowest for green wood and within the range of other established size reduction technologies. However, much narrower particle size distributions were observed in MBSM powders and they had significantly greater amounts of finer particles. Particles with high aspect ratio and sphericity were a characteristic of MBSM powders and this Production and characterisation of pine wood powders from a multi-blade shaft mill was true for wood milled above and below its fibre saturation point. MBSM powders from green wood showed evidence of higher specific surface area, larger pore volume and greater micropore diameter than those from HM powder. Preliminary microscopic examination suggested that cell walls in MBSM powders showed evidence of retaining their original native wood structure. Consequently, their extractive content appeared intact. This was in contrast to HM powder and it may reflect the differences between the two size reduction mechanisms. According to the produced MLR models, the results suggest that MBSM milling is more akin to a sawing process and opposite to that of impact-based mills.

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“…Natural binders differ in melt flow rate, impact properties, hardness, vapour permeability, and friction and decomposition coefficient. The water absorption of the bio-binder will also vary depending on the chemical composition of the bio-binder’s processing conditions [ 28 ]. The production of bio-based polymers using renewable materials has gained significant attention in recent decades because of the United Nation’s Sustainable Development Goals’ achievement.…”

Section: Introductionmentioning

confidence: 99%

Towards Next-Generation Sustainable Composites Made of Recycled Rubber, Cenospheres, and Biobinder

et al. 2021

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The utilisation of industrial residual products to develop new value-added materials and reduce their environmental footprint is one of the critical challenges of science and industry. Development of new multifunctional and bio-based composite materials is an excellent opportunity for the effective utilisation of residual industrial products and a right step in the Green Deal's direction as approved by the European Commission. Keeping the various issues in mind, we describe the manufacturing and characterisation of the three-component bio-based composites in this work. The key components are a bio-based binder made of peat, devulcanised crumb rubber (DCR) from used tyres, and part of the fly ash, i.e., the cenosphere (CS). The three-phase composites were prepared in the form of a block to investigate their mechanical properties and density, and in the form of granules for the determination of the sorption of water and oil products. We also investigated the properties’ dependence on the DCR and CS fraction. It was found that the maximum compression strength (in block form) observed for the composition without CS and DCR addition was 79.3 MPa, while the second-highest value of compression strength was 11.2 MPa for the composition with 27.3 wt.% of CS. For compositions with a bio-binder content from 17.4 to 55.8 wt.%, and with DCR contents ranging from 11.0 to 62.0 wt.%, the compressive strength was in the range from 1.1 to 2.0 MPa. Liquid-sorption analysis (water and diesel) showed that the maximum saturation of liquids, in both cases, was set after 35 min and ranged from 1.05 to 1.4 g·g -1 for water, and 0.77 to 1.25 g·g-1 for diesel. It was observed that 90% of the maximum saturation with diesel fuel came after 10 min and for water after 35 min.

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Molding of wood powder with a natural binder

Cited by 7 publications

References 4 publications

Fabrication of naturally derived wood products by thermal flow molding of wood powder with sucrose and citric acid

Fabrication of naturally derived wood products by thermal flow molding of wood powder with sucrose and citric acid

Production and characterisation of pine wood powders from a multi-blade shaft mill

Towards Next-Generation Sustainable Composites Made of Recycled Rubber, Cenospheres, and Biobinder

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