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.

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.

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.

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.

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.

The Experimental Studies on Self-Heat Conserving Facade Panel with Waste Fibers

2011 ◽  
Vol 415-417 ◽  
pp. 1521-1524
Author(s):  
Hong Cao Wang ◽  
Yong Ling Yu ◽  
Li Hua Lv
Keyword(s):  
Hot Pressing ◽  
Experimental Studies ◽  
Raw Material ◽  
National Standard ◽  
Optimum Process ◽  
Process Conditions ◽  
Insulation Property ◽  
Pressing Temperature ◽  
Plastic Composite ◽  
External Insulation

This paper introduces the studies of self-heat conserving facade panel with abandoned polypropylene fiber. The optimum process conditions were studied. The tensile properties, bending and impact properties of external insulation panel were tested. The results show that when the hot-pressing temperature is 180°C , the tensile, bending and impact of external insulation panel are best. The optimum process is hot-pressing temperature of 180 °C, hot pressure of 10MPa, hot-pressing time 12 Min. The physico-chemical properties were tested. The results show that the data of each test is up to the china national standard .The heat insulation property was tested, the results show that the panels have good insulation performance. The wallboard is light and easy to transport. Because the raw material adopts recycled polypropylene fibers, the price is low and the insulation is good. Recycled fiber-plastic composite is filled with bright future prospects.

Properties of Particleboard Manufactured with Modified Urea-Formaldehyde Resin

2010 ◽  
Vol 150-151 ◽  
pp. 1135-1138
Author(s):  
Ji Zhi Zhang ◽  
Jian Zhang Li ◽  
Shi Feng Zhang
Keyword(s):  
Hot Pressing ◽  
Urea Formaldehyde ◽  
Formaldehyde Emission ◽  
Modulus Of Rupture ◽  
Formaldehyde Resin ◽  
Pressing Temperature ◽  
Technical Parameters ◽  
Pressing Time ◽  
Uf Resin ◽  
Modified Urea

This study modified urea-formaldehyde (UF) resin with a modifier, and focused on properties of particleboard manufactured with the modified UF resin. The orthogonal design was used to analyze the effects of different levels of hot-pressing temperature, hot-pressing time, glue content, and waterproof agent content on the modulus of rupture (MOR), internal bonding strength (IB), and formaldehyde emission (FE) of the particleboard, and thus determined the optimum technical parameters of hot-pressing. The conclusions were as follows: (1) the modifier used in this study could significantly reduce the free formaldehyde content of UF resin and the formaldehyde emission of particleboard; (2) the optimum hot-pressing technical parameters of particleboard manufactured with the modified UF resin were hot-pressing temperature 180°C, hot-pressing time 50s/mm, glue content 12%, and waterproof agent content 0.6%. The MOR and IB under the optimum technical parameters could reach 20.7 and 0.47 MPa, and the FE was 0.85 mg/L.

Study of Amino Polymer Modified Soy Protein Adhesive

2011 ◽  
Vol 71-78 ◽  
pp. 3165-3169 ◽  
Author(s):  
Ying Ying Qiu ◽  
Cheng Li ◽  
Ji Zhing Zhang ◽  
Jin Xue Jiang ◽  
Shi Feng Zhang ◽  
...  
Keyword(s):  
Soy Protein ◽  
Hot Pressing ◽  
Bonding Strength ◽  
Ph Value ◽  
Formaldehyde Emission ◽  
Molar Ratio ◽  
Preparation Technology ◽  
Pressing Time ◽  
Soy Protein Adhesive ◽  
Pressing Technology

For improving the bonding strength and water resistance of plywood bonded with soy protein adhesive (SPA), an amino polymer (AP) was synthesized using polyamines, and the AP was used to modify SPA to prepare a modified soy protein adhesive (MSPA) in this paper. The plywood was prepared using MSPA, and the effects of preparation technology of amino polymer and hot-pressing technology of plywood on the bonding strength of plywood were investigated. The results showed that the optimization preparation technologies of AP were as follow: the molar ratio of polyamine/modifying agents was 0.25/1, the pH value was 5, the reaction temperature was 70 °C, and the reaction time was 1.5 h. The optimization preparation technologies of plywood were that the hot-pressing temperature was 150 °C and the hot-pressing time was 60 s/mm. The bonding strength of plywood made from MSPA on the optimization preparation technology was 1.03 MPa, which meets the requirement of plywood type II (³0.7MPa). The MSPA bonded plywood had a rather low formaldehyde emission, which is close to that of wood itself.

Manufacture and Properties of Metasequoia-Based Three-Layer Parquet Flooring

2021 ◽  
Vol 71 (2) ◽  
pp. 144-149
Author(s):  
Huimin Zhang ◽  
Zhanguang Wang ◽  
Quan Li ◽  
Cuixiang Lu
Keyword(s):  
Hot Pressing ◽  
Bending Strength ◽  
Urea Formaldehyde ◽  
Reference Value ◽  
Formaldehyde Emission ◽  
Formaldehyde Resin ◽  
Pressing Pressure ◽  
Pressing Temperature ◽  
Frequency Condition ◽  
Pressing Time

Abstract Metasequoia-based three-layer parquet flooring (MPF) was prepared under the following conditions: hot-pressing temperature of 95°C, hot-pressing time of 7 minutes, hot-pressing pressure of 9 kg·cm−2, and addition of 200 g·m−2 urea-formaldehyde resin adhesive. The results showed that the moisture content, density, formaldehyde emission, static bending strength, and elastic modulus of the three kinds of parquet flooring were not much different than poplar-based multilayer parquet flooring (PPF) or fir-based three-layer parquet flooring (FPF) on the market. The thermal conductivity of the MPF was 0.195 W·m−1·K−1, which was the lowest among the three kinds of parquet flooring. The sound absorption coefficient of MPF under 11 frequency conditions in the range of 0.2 to 2 kHz was higher than that of PPF and FPF under the same frequency condition. The research results provide a reference value for the efficient use of low-quality M. glyptostroboides wood.

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.

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