Sugarcane (Saccharum officinarium L.) bagasse binderless particleboard: Effect of hot pressing time study

2020 ◽  
Vol 31 ◽  
pp. 313-317
Author(s):  
Wan Noor Aidawati Wan Nadhari ◽  
Norani Abd Karim ◽  
Jia Geng Boon ◽  
Kushairi Mohd Salleh ◽  
Asniza Mustapha ◽  
...  
Keyword(s):  
Hot Pressing ◽  
Time Study ◽  
Pressing Time

scholarly journals Environmentally-Friendly High-Density Polyethylene-Bonded Plywood Panels

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1166 ◽  
Author(s):  
Pavlo Bekhta ◽  
Ján Sedliačik
Keyword(s):  
Mechanical Properties ◽  
Hot Pressing ◽  
High Density Polyethylene ◽  
Phenol Formaldehyde ◽  
Urea Formaldehyde ◽  
Physical And Mechanical Properties ◽  
Core Layer ◽  
High Density ◽  
Pressing Pressure ◽  
Pressing Time

Thermoplastic films exhibit good potential to be used as adhesives for the production of veneer-based composites. This work presents the first effort to develop and evaluate composites based on alder veneers and high-density polyethylene (HDPE) film. The effects of hot-pressing temperature (140, 160, and 180 °C), hot-pressing pressure (0.8, 1.2, and 1.6 MPa), hot-pressing time (1, 2, 3, and 5 min), and type of adhesives on the physical and mechanical properties of alder plywood panels were investigated. The effects of these variables on the core-layer temperature during the hot pressing of multiplywood panels using various adhesives were also studied. Three types of adhesives were used: urea–formaldehyde (UF), phenol–formaldehyde (PF), and HDPE film. UF and PF adhesives were used for the comparison. The findings of this work indicate that formaldehyde-free HDPE film adhesive gave values of mechanical properties of alder plywood panels that are comparable to those obtained with traditional UF and PF adhesives, even though the adhesive dosage and pressing pressure were lower than when UF and PF adhesives were used. The obtained bonding strength values of HDPE-bonded alder plywood panels ranged from 0.74 to 2.38 MPa and met the European Standard EN 314-2 for Class 1 plywood. The optimum conditions for the bonding of HDPE plywood were 160 °C, 0.8 MPa, and 3 min.

Physical Performance of Bamboo Strips-Oil Palm Trunk Veneers Composite Lumber at Different Layer Orientations and Hot Pressing Times

2012 ◽  
Vol 545 ◽  
pp. 325-329 ◽  
Author(s):  
Wan Nor Raihan Wan Jaafar ◽  
Shahril Anuar Bahari
Keyword(s):  
Physical Performance ◽  
Oil Palm ◽  
Hot Pressing ◽  
Cold Water ◽  
Phenol Formaldehyde ◽  
Hot Water ◽  
Compression Performance ◽  
Oil Palm Trunk ◽  
Pressing Time ◽  
Composite Lumber

In this study, composite lumber from a combination of bamboo strips and oil palm trunk veneers was produced and physically tested. The bamboo strips and oil palm trunk veneers were laid-up together alternately with two different types of layer orientation, such as parallel and cross orientations to each other. The composite lumber was pressed using hydraulic hot pressing machine at two different pressing times, such as 12 and 15 minutes. Phenol formaldehyde (PF) adhesive was used in the lamination process. Physical performance tests such as cold water delamination (CWD), hot water delamination (HWD), flexural and compression were conducted based on Japanese Agricultural Standard for LVL JAS: SE-10 [1]. Results showed that longer pressing time has increased the physical performance, except for flexural and compression performance of parallel orientation composite lumber. Cross orientation has increased the bonding strength behaviour between bamboo strips and oil palm trunk veneers, thus influenced the low delamination percentage and good modulus of elasticity value of composite lumber. Generally, this study has increased the understanding on physical performance of bamboo strips-oil palm trunk veneers composite lumber at different layer orientations and hot pressing times.

The Technology on Producing the First Class Plywood Using Fast Growing Eucalyptus Timber

2012 ◽  
Vol 193-194 ◽  
pp. 496-499 ◽  
Author(s):  
Kai Fu Li ◽  
Kai Meng Xu
Keyword(s):  
Production Technology ◽  
Hot Pressing ◽  
Bonding Strength ◽  
Key Factors ◽  
Pressing Temperature ◽  
Fast Growing ◽  
Pressing Time

There were three key factors including glue quantity of veneer, hot-pressing time, hot-pressing temperature to be researched on the effect of plywood performance, which gave a effective conclusion about technology parameter. The results indicated that the three factors obviously were related to the bonding strength and ranked as hot-pressing time > glue quantity of veneer > hot-pressing temperature in sequence. The best groups for production technology were that glue quantity of veneer was 320 g/m2 with hot-pressing time and temperature of 1.2 mm/min and 135 °C respectively.

Study on Structural Plywood Production Technology from Eucalyptus/poplar

2012 ◽  
Vol 476-478 ◽  
pp. 1547-1552 ◽  
Author(s):  
Li Hong Yao ◽  
Xi Ming Wang ◽  
Ben Hua Fei
Keyword(s):  
Bond Strength ◽  
Production Technology ◽  
Hot Pressing ◽  
Rapid Development ◽  
Practical Significance ◽  
Pressing Pressure ◽  
Poplar Plantation ◽  
Pressing Temperature ◽  
Pressing Time ◽  
The Difference

With the rapid development of wooden structure buildings in China, the demand for structural plywood enlarges significantly. Eucalyptus and poplar plantation is a very wide area of growth in china, therefore, there is practical significance to use eucalyptus and poplar plantation to produce wooden structural plywood. This study uses orthogonal test on pressing temperature, pressing time, pressing pressure, veneer glue spread - four factors influence the bond strength of structural plywood from Eucalyptus/poplar, and has obtained the superior technology. The results show that hot pressing temperature, pressing time, pressing pressure, veneer glue spread –four factors affect the bond strength of the structure plywood significantly, but the difference among the three veneer glue spread levels is not significantly. The better production technology is hot pressing temperature 135 °C, pressing time 24 min, pressing pressure 1.2 Mpa, veneer glue spread 320 g/m2.

Study on the Optimum Hot-Pressing Process and Surface Decoration of Waste Tetra Pak/Sawdust Composite Board

2013 ◽  
Vol 710 ◽  
pp. 147-151 ◽  
Author(s):  
Xiao Sun ◽  
Qiu Hui Zhang
Keyword(s):  
Hot Pressing ◽  
Resin Content ◽  
National Standard ◽  
Mass Ratio ◽  
Pressing Temperature ◽  
Composite Board ◽  
Pressing Time ◽  
Pressing Process ◽  
Surface Decoration ◽  
Tetra Pak

To improve the way of efficient recycling of waste Tetra Pak package, save wood materials and develope new packaging materials, this article studied on the optimum hot-pressing process and surface decoration of waste Tetra Pak/sawdust composite board. Using the orthogonal experimental method, we studied the effect of that four factors, such as resin content, hot-pressing temperature, hot-pressing time and Tetra Pak/sawdust mass ratio, on MOR, MOE, TS for 2h of waste Tetra Pak/sawdust composite board. And according to the measurement and analysis of these three test indicators of the board, we obtained the optimum hot-pressing process of waste Tetra Pak/sawdust composite board. The results showed the optimization of process parameters for the board was that: resin content for 14%, hot-pressing temperature for 150°C, hot-pressing time for 420s and Tetra Pak/sawdust mass ratio for 4:6 were suitable to product this board. At this point, the maximum MOR of the board was up to 23.1MPa, the maximum MOE of the board was up to 2917MPa, the minimum TS for 2h of the board was down to 6.1%. In the processing of PVC surface decoration, by using comparison tests, the results figured out that hot-pressing temperature for 50°C-60°C, hot-pressing time for 10s-20s, hot-pressing pressure beyond 0.02MPa were good for PVC to decorate this kind of board. The formaldehyde emission of this veneer composite board was 0.3mg/L, the surface abrasion resistance of it could reach 900r, besides, its performance of surface pollution resistance has reached the national standard.

The effect of hot pressing time on the microstructure and properties of Laves phase NbCr2 alloys

2008 ◽  
Vol 485 (1-2) ◽  
pp. 80-85 ◽  
Author(s):  
X. Xiao ◽  
S.Q. Lu ◽  
P. Hu ◽  
M.G. Huang ◽  
X.W. Nie ◽  
...  
Keyword(s):  
Hot Pressing ◽  
Laves Phase ◽  
Microstructure And Properties ◽  
Pressing Time

Heat Transfer Hot-Pressing Model of Medium Density Fiberboard

2014 ◽  
Vol 875-877 ◽  
pp. 1083-1086
Author(s):  
Hong Peng Li ◽  
Xing Jian Wang ◽  
Chun Rui Zhang
Keyword(s):  
Heat Transfer ◽  
Temperature Difference ◽  
Hot Pressing ◽  
Medium Density Fiberboard ◽  
Medium Density ◽  
Pressing Time ◽  
The Relationship

This by ratiocinating the theoretical formations of the pressing time of Cylindrical fiberboard and analyzing the relationship between the pressing time and Temperature difference and wood-based radius.

PHASE TRANSFORMATION OF BN NANOPARTICLES UNDER HIGH PRESSURE LOW TEMPERATURE CONDITIONS

2005 ◽  
Vol 19 (15n17) ◽  
pp. 2663-2668 ◽  
Author(s):  
Z. CHEN ◽  
Z. F. LAI ◽  
K. LI ◽  
D. L. CUI ◽  
N. LUN ◽  
...  
Keyword(s):  
High Pressure ◽  
Phase Transformation ◽  
Low Temperature ◽  
Boron Nitride ◽  
Hot Pressing ◽  
Cubic Boron Nitride ◽  
Strong Interactions ◽  
Hot Press ◽  
Temperature Conditions ◽  
Pressing Time

Phase transformation of BN nanoparticles under high pressure (580~860MPa) and low temperature (270~325°C) hot press conditions was investigated. It was found that the contents of orthorhombic boron nitride (oBN) and cubic boron nitride (cBN) increased with the increase of temperature and the prolonging of hot pressing time under high pressure conditions. At the same time, because of the intergrowth of hBN, oBN and cBN. there are strong interactions among these three phases.

scholarly journals Structure and characteristics of the hot pressed hydroxyapatite/poly-L-lactide composite

2002 ◽  
Vol 34 (1) ◽  
pp. 79-93 ◽  
Author(s):  
Nenad Ignjatovic ◽  
Edin Suljovrujic ◽  
Z. Stojanovic ◽  
Dragan Uskokovic
Keyword(s):  
Hot Pressing ◽  
Three Dimensional ◽  
Dispersion Analysis ◽  
Degree Of Crystallinity ◽  
Time Interval ◽  
Scanning Calorimetry ◽  
Pressing Time ◽  
Ir Study ◽  
Electron Dispersion ◽  
The Degree Of Crystallinity

Hydroxyapatite/poly-L-lactide (HAp/PLL) composite biomaterial can be obtained by different processing methods. Three-dimensional blocks of HAp/PLLA composite biomaterial with mechanical characteristics close to the natural bone tissue can be obtained by hot pressing procedure. Effects of synthesis and compacting on the structure and characteristics of the HAp/PLLA composite biomaterial were studied in this work. Using wade angle X-ray structural analyses (WAXS), differentially scanning calorimetry (DSC), thermogravimetric analysis (TGA) and infrared (IR) spectroscopy, the changes occurring in the material during synthesis and hot pressing were monitored. Surface microstructure was analyzed by scanning electronic microscopy (SEM) coupled with electron-dispersion analysis (EDX). The results obtained indicate a possible decrease in the degree of crystallinity with hot pressing time increase. A block of HAp/PLLA composite biomaterial with 1.6 times lower crystallinity of the polymer phase was obtained by hot pressing in a given time interval with a maximum of 60 minutes. Results of TG analysis show that PLLA stability decreases with increasing hot pressing time, and vice versa. IR study proved that neither destructive changes in constituents nor formation of new phases occurred during hot pressing.

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