A New Process for Manufacturing Straw Particleboard by Impregnating and Enzyme Treatment

2011 ◽  
Vol 221 ◽  
pp. 140-145 ◽  
Author(s):  
Chao Qi ◽  
Wei Hong Wang ◽  
Wen Jing Li
Keyword(s):  
Wheat Straw ◽  
Internal Bond ◽  
Phenolic Resin ◽  
Bending Strength ◽  
Enzyme Treatment ◽  
Spray Application ◽  
Thickness Swelling ◽  
New Process ◽  
Wheat Straw Particleboard ◽  
Novel Method

However, the wheat straw surface was difficult to be penetrated by adhesive due to the wax layer existed on its surface. It is a key point that how to manufacture straw particleboard with traditional resin. This paper explored a novel method to solve this problem by pre-treating straw particles with enzyme and impregnating with resin. Different from conventional spray application, straw was impregnated with phenolic resin (PF). Part of these straws was pretreated with xylanase and lipase before impreanating to improve the bonding between adhesive and straw. The results indicated that when straw was pretreated with lipase and and then applied 10% PF by impregnating, the properties of wheat straw particleboard were optimal, bending strength was 13.81 MPa, elastic modulus was 2.67GPa, internal bond strength was 0.113MPa and 2h thickness swelling was 16.74%.

Revisiting hardboard properties from the fiber sorting point of view

Holzforschung ◽  
2015 ◽  
Vol 69 (5) ◽  
pp. 627-632 ◽  
Author(s):  
Elena Tikhonova ◽  
Mark Irle ◽  
Michael Lecourt
Keyword(s):  
Linear Regression ◽  
Specific Surface ◽  
Internal Bond ◽  
Production Cost ◽  
Bending Strength ◽  
Point Of View ◽  
Thickness Swelling ◽  
Fiber Size ◽  
Board Performance ◽  
Fiber Dimensions

AbstractThis study investigates the effects of fiber dimensions on hardboard properties. Fiber size is determined by the amount of energy applied during refining, and fiber size affects board properties; that is, production cost and board performance are closely related. Therefore, in the present paper, the effects of fiber dimensions on hardboard performance have been investigated. To optimize the hardboard process, fiber size was varied via screening, and the screen fractions were further classified using a Bauer-McNett apparatus. Hardboards were produced with mixtures of classified fibers. Bending strength, internal bond, and thickness swelling of the final boards were evaluated according to EN 310, EN 319, and EN 317, respectively. The effects of fiber size on the investigated properties were analyzed by means of multivariate linear regression. Generally, a higher proportion of small fibers appears to improve board performance presumably due to the higher specific surface area of fibers, which facilitate interfiber bonding.

Dimensional stability and mechanical properties of bio-based composites produced from hydro-thermal treated wheat straw

BioResources ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. 7901-7915
Author(s):  
Ümit Büyüksarı ◽  
Ömer Özyürek
Keyword(s):  
Mechanical Properties ◽  
Thermal Treatment ◽  
Wheat Straw ◽  
Dimensional Stability ◽  
Internal Bond ◽  
Steam Explosion ◽  
Modulus Of Rupture ◽  
Thickness Swelling ◽  
Wood Particles ◽  
Particle Ratio

Bio-composites were produced from untreated (UT) and hydro-thermally treated (HTT) wheat straw (WS) particles and wood, and their dimensional stability and mechanical properties were investigated. The HTT treatment consisted of subjecting the WS particles to a steam explosion process for 8 min at 180 °C. The HTT and UT WS particles were mixed with the wood particles at 10, 20, 30, and 40% ratios. The physical properties, including density, water absorption (WA), and thickness swelling (TS), were determined for the bio-based composites. The mechanical properties evaluated included the modulus of rupture, modulus of elasticity, and internal bond strength. Statistical analyses showed that the hydro-thermal treatment and the WS ratio had significant effects on the dimensional stability and mechanical properties of the bio-composites. The WA of the composites after 2-h and 24-h rose significantly when the HTT WS particle ratio was increased from 10 to 40%. The 2-h and 24-h WA values of HTT-10 were 6.3% and 5.3% lower than those of UT-10, respectively. Improvements in the 2-h TS value were achieved by the HTT WS particles at the 10% ratio, and in the 24-h TS value at the 10 and 40% ratios. The mechanical properties of the composites were higher in the HTT group, but decreased in both the UT and HTT groups as the WS ratio increased.

Utilization of lignin powder for manufacturing self-binding HDF

Holzforschung ◽  
2017 ◽  
Vol 71 (7-8) ◽  
pp. 555-561 ◽  
Author(s):  
Ramunas Tupciauskas ◽  
Janis Gravitis ◽  
Janis Abolins ◽  
Andris Veveris ◽  
Martins Andzs ◽  
...  
Keyword(s):  
Wheat Straw ◽  
Internal Bond ◽  
Lignin Content ◽  
Control Sample ◽  
Kraft Lignin ◽  
Modulus Of Rupture ◽  
Thickness Swelling ◽  
Medium Density Fibreboard ◽  
Dry Conditions ◽  
Softwood Kraft Lignin

Abstract 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.

scholarly journals EFFECTS OF POLYMER ADDITIVES ON SOME MECHANICAL AND PHYSICAL PROPERTIES OF CEMENT BONDED PARTICLEBOARDS

Wood Research ◽  
2021 ◽  
Vol 66 (3) ◽  
pp. 331-340
Author(s):  
HASAN HÜSEYİN TAŞ ◽  
BİLGE ARSLAN ◽  
HÜLYA KALAYCIOĞLU
Keyword(s):  
Bond Strength ◽  
Water Absorption ◽  
Internal Bond ◽  
Bending Strength ◽  
Physical And Mechanical Properties ◽  
Bending Stiffness ◽  
Internal Bond Strength ◽  
Polymer Additives ◽  
Thickness Swelling ◽  
Cement Mixture

The effects of some polymer additives, also called super plasticizers, on selected physical and mechanical properties of cement bonded particle board were investigated. Two different kinds of poly carboxylic ether (PF300, DX40) and a melamine based polymer (300M) were added to the wood cement mixture. The ratios of polymer additives to the wood cement mixture were 1%, 1.2% and 1.4%. Cement bonded particleboards were manufactured with wood/cement (w/w) ratio of 1:3; target density of 1300 kg.m-3, and CaCl2 content of 5%. The cement bonded particleboards were tested for water absorption (2 and 24 hour), thickness swelling (2 and 24 hour), bending stiffness and strength and internal bond strength. Results of the study showed that most of the polymer addition decreased water absorption and thickness swelling of the boards. Replacement of cement with polymers increased internal bond strength and bending stiffness of the boards while bending strength was slightly reduced. Use of small amount of super plasticizers significantly improves most of the board properties.

Mechanical Properties of Wheat Straw Particleboard Using Composite Adhesives

2010 ◽  
Vol 113-116 ◽  
pp. 2096-2099 ◽  
Author(s):  
Yan Hua Zhang ◽  
Ji You Gu ◽  
Ying Feng Zuo ◽  
Ming Wei Di ◽  
Hai Yan Tan ◽  
...  
Keyword(s):  
Wheat Straw ◽  
Modulus Of Elasticity ◽  
Bonding Strength ◽  
Wood Products ◽  
Modulus Of Rupture ◽  
Great Promise ◽  
Internal Bonding ◽  
Thickness Swelling ◽  
Wheat Straw Particleboard ◽  
Internal Bonding Strength

The purpose of the study was to use a cheap wheat straw to manufacture particleboard. Wheat straws offer great promise and new challenges as replacement for wood in processed wood products. The particleboard was produced using composite adhesive which the urea-formaldehyde (UF) adhesives modified by emulsifiable polymeric methylene diphenyl diisocyanate (EPU). The properties of the particleboard was evaluated by measuring internal bonding strength(IB), thickness swelling, modulus of rupture(MOR), modulus of elasticity (MOE) and formaldehyde emission. The optimal condition was chosen at density of 0.75g/cm3, UF/EPU ratio of 70/30, adhesive amounts of 10% based on the dry amounts of wheat straw. The test results showed that maximum dry internal bonding strength, wetting internal bonding strength, modulus of rupture, modulus of elasticity was 0.45MPa, 0.072MPa, 31.50MPa and 4564MPa, respectively. The thickness swelling (TS2h) and thickness swelling (TS24h) was 3.51% and 11.1%, respectively. The free formaldehyde of wheat straw particleboard reached E0-type national standards.

scholarly journals Eco-Friendly, High-Density Fiberboards Bonded with Urea-Formaldehyde and Ammonium Lignosulfonate

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 220
Author(s):  
Petar Antov ◽  
Viktor Savov ◽  
Ľuboš Krišťák ◽  
Roman Réh ◽  
George I. Mantanis
Keyword(s):  
Mechanical Properties ◽  
Bending Strength ◽  
Urea Formaldehyde ◽  
Physical And Mechanical Properties ◽  
High Density ◽  
Thickness Swelling ◽  
Formaldehyde Content ◽  
Uf Resin ◽  
Natural Wood ◽  
European Standards

The potential of producing eco-friendly, formaldehyde-free, high-density fiberboard (HDF) panels from hardwood fibers bonded with urea-formaldehyde (UF) resin and a novel ammonium lignosulfonate (ALS) is investigated in this paper. HDF panels were fabricated in the laboratory by applying a very low UF gluing factor (3%) and ALS content varying from 6% to 10% (based on the dry fibers). The physical and mechanical properties of the fiberboards, such as water absorption (WA), thickness swelling (TS), modulus of elasticity (MOE), bending strength (MOR), internal bond strength (IB), as well as formaldehyde content, were determined in accordance with the corresponding European standards. Overall, the HDF panels exhibited very satisfactory physical and mechanical properties, fully complying with the standard requirements of HDF for use in load-bearing applications in humid conditions. Markedly, the formaldehyde content of the laboratory fabricated panels was extremely low, ranging between 0.7–1.0 mg/100 g, which is, in fact, equivalent to the formaldehyde release of natural wood.

Preparation and Properties of SiC/Phenolic Resin for the Heat of LED

2016 ◽  
Vol 848 ◽  
pp. 454-459
Author(s):  
Cong Wu ◽  
Kang Zhao ◽  
Yu Fei Tang ◽  
Ji Yuan Ma
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Powder Metallurgy ◽  
Phenolic Resin ◽  
Bending Strength ◽  
Experimental Results ◽  
Low Thermal Conductivity ◽  
Industry Standard ◽  
Insulation Performance

In order to solve the problem that low thermal conductivity of the plastics for the heat of LED, SiC/Phenolic resin for the heat of LED were fabricated combining powder metallurgy. The effects of particles diameters, content and adding nanoparticles on thermal conductivity of the fabricated composites were investigated, the mechanical properties were also characterized. The experimental results showed that the materials were obtained, and the insulation performance of the fabricated SiC/Phenolic resin was higher than the industry standard one, the thermal conductivity reached 4.1W/(m·k)-1. And the bending strength of the fabricated composites was up to 68.11MPa. The problem of low thermal conductivity of the material is expected to be solved. In addition, it is meaningful for improving LED life.

scholarly journals Processing parameters optimization of cotton stalk (Gossypium hirsutum L.) particleboards with emulsifiable polymeric isocyanate adhesive

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 4149-4170
Author(s):  
Thanh Tung Nguyen ◽  
Adam Redman ◽  
William Leggate ◽  
Luigi-j Vandi ◽  
Henri Bailleres ◽  
...  
Keyword(s):  
Particle Size ◽  
Internal Bond ◽  
Fine Particles ◽  
Processing Parameters ◽  
Parameters Optimization ◽  
Modulus Of Rupture ◽  
Cotton Stalk ◽  
Thickness Swelling ◽  
Surface Particle ◽  
Polymeric Isocyanate

The compaction behavior of cotton stalk particle mats, temperature profile inside the particle mats, and influence of surface particle size were studied relative to the properties of three-layered cotton stalk particleboards. Modulus of rupture (MOR), modulus of elasticity (MOE), internal bond, and thickness swelling were used as a measure for mechanical and physical performance. Two types of cotton stalk particleboard were manufactured. Results indicated that compression stiffness of the particle mat increased with increasing particle size; however, it decreased with increasing mat moisture content and temperature. At mat moisture contents of 12% and 18%, the plateau temperature at the centerline was not significantly different between boards having coarse and fine particles. However, the plateau time of boards with coarse particles was significantly lower than that of boards with fine particles. Additionally, thickness swelling of boards with a surface particle size of 2 mm was significantly lower than that of boards with surface particle size of 4 mm. Boards with a surface particle size of 2 mm had MOR and MOE values 15% and 10% higher, respectively, than boards with surface particle size of 4 mm. Internal bond decreased 6.5% with decreasing surface particle size from 4 mm to 2 mm.

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