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.

scholarly journals The Performance Optimization of Oriented Strand Board Veneer Technology

Coatings ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 511 ◽  
Author(s):  
Xianqing Xiong ◽  
Qingru Ma ◽  
Jie Ren
Keyword(s):  
Performance Optimization ◽  
Hot Pressing ◽  
Bonding Strength ◽  
Oriented Strand Board ◽  
Penetration Rate ◽  
Pressing Temperature ◽  
Processing Technologies ◽  
Pressing Time ◽  
Surface Bonding ◽  
Unit Pressure

Oriented strand board (OSB) veneer technology and its performance have been widely studied in order to expand the range of OSB substrates. In this paper, OSB was a modified composite with boards as substrates, Myanmar old mahogany bark as the veneer material, and a cornstarch adhesive. Under such conditions, the optimal veneer technology was studied, and the index of the surface bonding strength and the veneer penetration rate were utilized in order to determine the performance. Two different processing technologies, cold pressing and hot pressing, were experimentally compared and hot pressing showed better performance. Subsequently, experiments were performed on the surface bonding strength and veneer penetration rate. The results show that the veneer performance of OSB is best when the unit pressure is 1.0 MPa, the hot-pressing temperature is 90 °C, and the hot-pressing time is 240 s. Furthermore, the magnitude of influence of the factors affecting the bonding strength is as follows: unit pressure > hot-pressing temperature > hot-pressing time. The research results have prospective significance for the performance optimization of OSB veneer technology.

Study on Preparation and Properties of Recycled Plastic-Poplar Plywood

2011 ◽  
Vol 121-126 ◽  
pp. 2917-2921
Author(s):  
Fang Zhao ◽  
Kun Lin Song ◽  
Wei Gao ◽  
Shuang Bao Zhang
Keyword(s):  
Hot Pressing ◽  
Bonding Strength ◽  
Formaldehyde Emission ◽  
Optimum Process ◽  
Process Conditions ◽  
Plastic Film ◽  
Pressing Temperature ◽  
Pressing Time ◽  
Recycled Plastics ◽  
Peak Value

In this paper, traditional adhesives were replaced by recycled plastics to make poplar plywood by hot-pressing. The results showed that the amount of recycled plastics made no obvious effects on the bonding strength, and the dry bonding strength reached the maximum with the amount of plastic film of 100g/m2. When the hot temperature was 150°C, the bonding strength no longer increased with the temperature, or even decreased. When the pressing time was 5 minutes, the bonding strength achieved the peak value, and then declined along with the extending of time. After testing, formaldehyde emission was found to be very low or zero. The new plywood is a kind of green and environmentally friendly wood-based panels. Above all, it could be concluded that the amount of plastic film of 100g/m2, the hot pressing temperature of 150°C and the hot pressing time of 5 minutes were the optimum process conditions in this experiment.

Investigation of Soybean/PF Resin Based Adhesive Applying on Plywood

2010 ◽  
Vol 113-116 ◽  
pp. 2007-2011 ◽  
Author(s):  
Qiang Gao ◽  
Rui Dang ◽  
Zi Tao Sang ◽  
Shi Feng Zhang ◽  
Jian Zhang Li
Keyword(s):  
Thermal Behavior ◽  
Hot Pressing ◽  
Bonding Strength ◽  
Formaldehyde Emission ◽  
Wood Composites ◽  
Pressing Temperature ◽  
Technical Parameters ◽  
Pressing Time ◽  
Environmental Friendly ◽  
Optimum Formula

For developing high bonding strength and environmental-friendly wood composites, a soybean/PF resin based (SP) adhesive was investigated and applied in the manufacture of plywood. Formula of the adhesive, the thermal behavior of the adhesive, and the optimum technical parameters of the plywood manufacture were investigated. The bonding strength and formaldehyde emission of plywood bonding by the adhesive were tested according to Chinese Standards methods. The result shows: the optimum formula of SP adhesive was: soy-based adhesive was 70%, PF resin was 30%; the optimum technical parameters of the plywood manufacture were: hot-pressing temperature was 160 °C, hot-pressing time was 80 s/mm, pressure intensity was 1.2 MPa, and glue content was 160 g /m2; Properties of plywood made under the optimum technical parameters were: the bonding strength was 1.30 MPa, the formaldehyde emission was 0.32 mg/L. It completely meets the type Ⅰ plywood requirement and level E0 of formaldehyde emission.

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.

Production Process and Nondestructive Testing of Soybean Stalks Particleboard

2012 ◽  
Vol 430-432 ◽  
pp. 1339-1342
Author(s):  
Wei Lu ◽  
Jia Yao ◽  
Ping Han ◽  
Wan Jiang Wu ◽  
Chuang Liu
Keyword(s):  
Mechanical Properties ◽  
Hot Pressing ◽  
Time Distribution ◽  
Process Analysis ◽  
Orthogonal Experiment ◽  
Flexural Vibration ◽  
Modulus Of Rupture ◽  
Process Conditions ◽  
Pressing Temperature ◽  
Pressing Time

Orthogonal experiment of four factor and three level has been adopted, through the process analysis of the various factors on mechanical properties, the best process conditions of soybean stalks particleboard are chosen as: density is 0.7g/cm3, glue content is 12%, and hot pressing time distribution is 3+4 minutes, hot pressing temperature is 175°C. The Ef (the dynamic elastic modulus of NDT) of soybean stalks particleboard has been examined by flexural vibration method of FFT(Fast Fourier Transform), the regression between Ef and MOE(modulus of elasticity), MOR(modulus of rupture) is significant and existing high relevance degree, so using FFT method for NDT of composite materials is feasible.

High Compressive Strength of Palm Oil Empty Fruit Bunches (Elaeis guineensis) Composites

2014 ◽  
Vol 896 ◽  
pp. 557-561 ◽  
Author(s):  
Ida Sriyanti ◽  
Lina Agustina ◽  
Iftita Selviana ◽  
Leni Marlina
Keyword(s):  
Compressive Strength ◽  
Silica Nanoparticles ◽  
Hot Pressing ◽  
Elaeis Guineensis ◽  
Pressing Pressure ◽  
Mass Ratio ◽  
Pressing Temperature ◽  
Pressing Method ◽  
Empty Fruit Bunches ◽  
Pressing Time

Simple mixing and hot pressing methods were used to make high strength and light-weight composite from oil palm empty fruit bunches (OPEFB) using PVAc as an adhesive and silica nanoparticles as a filler. The mechanical strength of the composite was examined in term of compressive strength. The simple mixing method was used to mix composition with PVAc and silica nanoparticles. Silica nanoparticles were added as filler. Hot pressing method was used to press the mixed composites at a pressing pressure of 85 MPa, pressing temperature of 150 °C, and pressing time of 20 minutes. The optimum composition in term of compressive strength for the strongest composite had a mass ratio of OPEFB/PVAc of 13 : 2 and obtained a compressive strength of 82,88 MPa. Higher compressive strength of 100,39 MPa was obtained by adding the silica nanoparticles at a mass ratio of OPEFB/PVAc/silica nanoparticles of 13 : 2 : 0,75. At pressing pressure of 100 MPa, pressing temperature of 150 °C, and pressing time of 20 minutes, we found compressive strength of 115,35 MPa. Data analysis of XRD showed that the used silica nanoparticles were in amorphous phase or had broad pattern. The compressive strength data showed that the composites were stronger than the composites made by Masturi and Kumagizuri, and also stronger than the ordinary wood-based composites. Thus, the composites are feasible to be used to replace wood-based composites, especially in furnishings.

Manufacturer Technology of Dense Chinese Fir Laminated Veneer Lumber (LVL)

2012 ◽  
Vol 542-543 ◽  
pp. 363-366
Author(s):  
Chi Qiang Yao ◽  
Li Yu ◽  
Yan Jun Li ◽  
Shi Ke Xu ◽  
Lan Xing Du
Keyword(s):  
Mechanical Properties ◽  
Hot Pressing ◽  
Phenol Formaldehyde ◽  
Chinese Fir ◽  
Water Soluble ◽  
Technological Parameters ◽  
Pressing Temperature ◽  
Laminated Veneer Lumber ◽  
Pressing Time ◽  
Processing Factors

Dense Chinese Fir LVL was manufactured from Chinese Fir veneer which was impregnated with laboratory prepared water soluble phenol formaldehyde(PF) resin. The influences of various processing factors on properties of dense Chinese Fir LVL were explored. It is showed that the mechanical properties of dense Chinese Fir LVL first increase and then decrease with the increase of drying temperature and hot-pressing time. Plank performance becomes higher with the increase of compressibility and hot-pressing temperature. The optimum technological parameters for LVL process are set.

Technics and Properties of Plywood Manufacture with Modified Urea-Formaldehyde Resin

2012 ◽  
Vol 602-604 ◽  
pp. 743-746 ◽  
Author(s):  
Xiao Mei Wang ◽  
Jian Zhang Li ◽  
Ji Zhi Zhang ◽  
Qiang Gao
Keyword(s):  
Hot Pressing ◽  
Urea Formaldehyde ◽  
Formaldehyde Emission ◽  
Urea Formaldehyde Resin ◽  
Formaldehyde Resin ◽  
Hot Press ◽  
Pressing Temperature ◽  
Technical Parameters ◽  
Pressing Time ◽  
Modified Urea

In this study, urea-formaldehyde resin was modified and used to bond three-ply plywood. The effect of hot press parameters on properties of plywood bonded by the modified urea-formaldehyde resin adhesive was investigated by an L(43) experimental design. The optimum technical parameters of hot press were obtained. Conclusions were as follows: (1) After modification, the free formaldehyde content of the urea-formaldehyde resin and the formaldehyde emission of resulting plywood were reduced by 74% and 70%, respectively; (2) The optimum technical parameters were 140°C of hot-pressing temperature, 80s/mm of hot-pressing time, 300g/m2 of glue content, and 0.8% of curing agent; (3) Under the optimum technical parameters, the bond strength and the formaldehyde emission of the plywood was 1.17MPa and 0.47mg/L, respectively.

scholarly journals Further Exploration of Sucrose–Citric Acid Adhesive: Investigation of Optimal Hot-Pressing Conditions for Plywood and Curing Behavior

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1996 ◽  
Author(s):  
Zhao ◽  
Sakai ◽  
Wu ◽  
Chen ◽  
Zhu ◽  
...  
Keyword(s):  
Citric Acid ◽  
Hot Pressing ◽  
Heating Temperature ◽  
National Standard ◽  
Endothermic Reaction ◽  
Spread Rate ◽  
Pressing Temperature ◽  
Pyrolysis Gas ◽  
Curing Behavior ◽  
Pressing Time

In previous research, sucrose and citric acid were used to synthesize an eco-friendlyplywood adhesive. Herein, further research was performed to determine the optimal hot-pressingconditions and curing behavior of a sucrose-citric acid (SC) adhesive. The results of dry and wetshear strength measurements showed that the optimal hot-pressing temperature, hot-pressing time,and spread rate of plywood samples bonded by the SC adhesive were 190 °C, 7 min, and 140 g/m2,respectively. When plywood was bonded at the optimal hot-pressing conditions, the wet shearstrength met the requirements of the China National Standard GB/T 9846-2015. Thermal analysisshowed that the thermal degradation and endothermic reaction temperatures of the SC 25/75adhesive were lower than either sucrose or citric acid individually. In addition, the insoluble massproportion increased with the heating temperature and time. The Pyrolysis Gas Chromatographyand Mass Spectrometr (Py-GC/MS) analysis confirmed that the SC adhesive was cured by thereaction between furan compounds, saccharide, and citric acid, and the resulting polymer appearedto be joined by ether linkages.

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