Improvements in the production of wood fiber insulation boards using hot-air/hot-steam process

Kirsch, A.A; Ostendorf, Kolja; Euring, Markus

doi:10.1007/s00107-018-1306-z

Cited by 20 publications

(19 citation statements)

References 16 publications

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“…With an increasing proportion husks, the internal bond strength values stabilized at values corresponding to boards consisting of 80% husks. Similar results were achieved in the work [23]; however, wood fibers were used in this work. If we compare our result with high density binderless insulation boards made from coconut husks and bagasse in work [24], it can be seen that results in this work are very similar.…”

Section: Resultssupporting

confidence: 84%

“…The water uptake was also reduced with the number of husks added. The measured results are comparable, for example, to wood fiber-based materials with the addition of a mediator (low molecular weight material 4-hydroxybenzoic acid (HBA) with a chemical purity of 99%) specified in the work of Kirsch et al [23]. Due to inconclusive evidence, we decided to express the water uptake as a proportion of the board dry matter, and the results can be seen in Figure 6 right.…”

Section: Resultsmentioning

confidence: 71%

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Waste Utilization: Insulation Panel from Recycled Polyurethane Particles and Wheat Husks

et al. 2019

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This study provides a solution for the utilization of two waste materials, namely the residues of soft polyurethane foam from the production of mattresses and winter wheat husks. Thermal insulation panels with a nominal density of 50–150 kg/m3, bonded one-component moisture curing polyurethane adhesive, were developed, and the effect of the ratio between recycled polyurethane foam and winter wheat husk on internal bond strength, compressive stress at 10% strain, water uptake, coefficient of thermal conductivity, and volumetric heat capacity was observed. The developed composite materials make use of the very good thermal insulation properties of the two input waste materials, and the coefficient of thermal conductivity of the resulting boards achieves excellent values, namely 0.0418–0.0574 W/(m.K). The developed boards can be used as thermal insulation in the structures of environmentally friendly buildings.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 71%

Waste Utilization: Insulation Panel from Recycled Polyurethane Particles and Wheat Husks

et al. 2019

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“…So far, only marginal efforts have been made to investigate natural adhesives for the production of wood fiber insulation boards to produce more natural and sustainable products. Examples in this context are enzymatic activation of wood fibers [ 7 , 8 , 9 ], protein adhesive based on blood albumin [ 10 ] or an adhesive based on crude glycerol and citric acid [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…Mansouri et al [ 29 , 30 ] studied a mixture of glyoxalated and hydroxymethylated lignin-solutions with PF-resin and polymeric diphenylmethane diisocyanate (pMDI) which can save amounts of these costly resins. Kirsch [ 7 ] and Kirsch et al [ 9 ] showed a possible reduction of pMDI quantities by enzymatic pre-treatment of wood fibers with Laccase-Mediator-Systems (LMS) for the production of wood fiber insulation boards.…”

Section: Introductionmentioning

confidence: 99%

On the Feasibility of a pMDI-Reduced Production of Wood Fiber Insulation Boards by Means of Kraft Lignin and Ligneous Canola Hulls

et al. 2021

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The thermal insulation of buildings using wood fiber insulation boards (WFIBs) constitutes a positive contribution towards climate change. Thereby, the bonding of wood fibers using mainly petrochemical-based resins such as polymeric diphenylmethane diisocyanate (pMDI) is an important measure to meet required board properties. Still there is a need to reduce or partial substitute the amount of these kinds of resins in favor of a greener product. This study therefore focusses on the feasibility of reducing the amount of pMDI by 50% through the addition of 1% BioPiva 395 or Indulin as two types of softwood Kraft-Lignin and lignin rich canola hulls together with propylene carbonate as a diluent. A panel density of 160 kg/m3 and a thickness of 40 mm was aimed. The curing of these modified pMDI was investigated by using two types of techniques: hot-steam (HS) and innovative hot-air/hot-steam-process (HA/HS). The WFIBs were then tested on their physical-mechanical properties. The equilibrium moisture content (EMC) was determined at two different climates. An exemplary investigation of thermal conductivity was conducted as well. The WFIBs did undergo a further chemically based analysis towards extractives content and elemental (C, N) composition. The results show that it is feasible to produce WFIBs with lower quantities of pMDI resin and added lignin with enhanced physical-mechanical board properties, which were lacking no disadvantages towards thermal conductivity or behavior towards moisture, especially when cured via HA/HS-process.

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“…Different types of insulation materials are available, the ones made with polymeric foams and the ones made with fibers. Those made with fibers can be classified into two subgroups: Inorganic (e.g., glass fiber, amorphous fiber (rock wool), ceramic fiber) and organic (e.g., hemp fiber, cotton fiber, wood fiber) fibers [5]. Recently, the use of natural, sustainable, renewable, and environmentally friendly materials has gained interest because of increasing environmental awareness.…”

Section: Introductionmentioning

confidence: 99%

Thermo-Mechanical Properties of a Wood Fiber Insulation Board Using a Bio-Based Adhesive as a Binder

et al. 2020

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The goal of the present study was to develop a low-density thermal insulation board using wood fibers and a bio-based adhesive as a binder, which was prepared from a crude glycerol and citric acid mixture. The physical and mechanical properties of insulation boards manufactured using two ratios of crude glycerol and citric acid (1:0.66 and 1:1 mol/mol) and two adhesive contents (14% and 20%) were evaluated. The results show that the insulation boards with a range of density between 332 to 338 kg m−3 present thermal conductivity values between 0.064 W/m-K and 0.066 W/m-K. The effect of adhesive content was very significant for certain mechanical properties (tensile strength perpendicular to surface and compressive strength). The tensile strength (internal bond) increased between 20% and 36% with the increased adhesive content. In contrast, the compressive strength decreased between 7% and 15%. The thermo-mechanical properties obtained of insulation boards such as thermal conductivity, traverse strength, tensile strength parallel and perpendicular to surface, and compressive strength are in accordance with the requirements of the American Society for Testing and Materials C208-12 standard for different uses. The results confirm the potential of crude glycerol and citric acid mixture to be used as an adhesive in the wood fiber insulation boards’ manufacturing for sustainability purposes.

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Improvements in the production of wood fiber insulation boards using hot-air/hot-steam process

Cited by 20 publications

References 16 publications

Waste Utilization: Insulation Panel from Recycled Polyurethane Particles and Wheat Husks

Waste Utilization: Insulation Panel from Recycled Polyurethane Particles and Wheat Husks

On the Feasibility of a pMDI-Reduced Production of Wood Fiber Insulation Boards by Means of Kraft Lignin and Ligneous Canola Hulls

Thermo-Mechanical Properties of a Wood Fiber Insulation Board Using a Bio-Based Adhesive as a Binder

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