An Environmentally Friendly Composite Composed of Short-Cut Grass and Starch

2014 ◽  
Vol 525 ◽  
pp. 3-6
Author(s):  
Chuan Bao Wu ◽  
Xiang Hui Zeng
Keyword(s):  
Tensile Strength ◽  
Hot Pressing ◽  
Raw Materials ◽  
Environmentally Friendly ◽  
Tensile Fracture ◽  
Water Medium ◽  
Pressing Temperature ◽  
Pressing Method ◽  
Pressing Time ◽  
Processing Factors

Short-cut grass and starch were selected as raw materials to prepare environmentally friendly composite by hot-pressing method. Results indicated that short-cut grass and starch were easily mixed uniformly by water medium and adapt to hot-pressing process. Hot-pressing time and hot-pressing temperature influenced the performances of composites. The strength and elongation first increase and then decrease with the increase of two processing factors. Tensile strength and strength at fracture reach 2.3 MPa and 1.2 MPa respectively when hot-pressing was performed at 140 °C for 10 min. The tensile strength is always higher than strength at tensile fracture and the elongation at fracture is always higher than that at maximum force. This indicates that the fracture of composite is ductile fracture. The hardness of composite is uneven. Long hot-pressing time resulted in not too obvious decrease of hardness.

Composite of Shortcut Grass and Poly(vinyl alcohol): Preparation and Performance

2014 ◽  
Vol 881-883 ◽  
pp. 1179-1182
Author(s):  
Chuan Bao Wu ◽  
Yu Jun Zhou
Keyword(s):  
Tensile Strength ◽  
Hot Pressing ◽  
Vinyl Alcohol ◽  
Raw Materials ◽  
Raw Material ◽  
Tensile Fracture ◽  
Poly Vinyl Alcohol ◽  
Pressing Temperature ◽  
Pressing Method ◽  
And Performance

The environmentally friendly composite of poly (vinyl alcohol) (PVA) and shortcut grass were prepared by hot-pressing method. First, dry grass was cut into 1.5 cm long segments. Then, shortcut grass was mixed with PVA by using water as medium. The mixed uniformly raw materials were hot-pressed at different temperatures for different times. The effects of raw material ratio, hot-pressing temperature and hot-pressing temperature on composites performance were studied. Results showed that composites tensile strength increases with the increase of PVA content. Tensile strength reaches 3.59 MPa at 50% of PVA content. The tensile fracture stretch increases with PVA content and reaches 25.28% when PVA content is 50%. The tensile strength first increases and then decreases with the increase of hot-pressing temperature and hot-pressing temperature. The hardness of composite is uneven. Hardness at 20% of PVA content is lower slightly than that at other PVA contents.

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.

scholarly journals A Process Optimization and Performance Study of Environmentally Friendly Waste Newspaper/Polypropylene Film Layered Composites

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 413
Author(s):  
Neng Guan ◽  
Chuanshuang Hu ◽  
Litao Guan ◽  
Weiwei Zhang ◽  
Hong Yun ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Flexural Strength ◽  
Water Absorption ◽  
Hot Pressing ◽  
Environmentally Friendly ◽  
Process Conditions ◽  
Layered Composites ◽  
Performance Study ◽  
Polypropylene Film ◽  
Pressing Temperature

Waste newspaper are currently used in a single way and have low utilization rates. In this paper, the optimal process of preparing environmentally friendly layered composites by using waste newspaper combined with polypropylene film lamination was studied. The effects of hot-pressing temperature, hot-pressing time and paper content on the properties of the composites were analyzed. The results showed that under the process conditions of hot-pressing temperature 180 °C, compression time 20 min and paper content 66.7%, the obtained composite material had a flexural strength of 126 MPa, a tensile strength of 95 MPa, an impact strength of 5.3 kJ/m2 and a water absorption thickness expansion ratio of 3.2%. Tensile performance increased by 164% compared to the original waste newspaper. Compared to our previous work, the hot processing time had been cut in half and costs were lower. In terms of creep properties, the unrecoverable strain rate was reduced by 57.5% compared to pure polypropylene. The results show that the material can maintain excellent flexural strength, tensile strength and water absorption performance while making good use of waste newspaper.

scholarly journals Fabrication of (SiC-AlN)/ZrB2 Composite with Nano-Micron Hybrid Microstructure via PCS-Derived Ceramics Route

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 334
Author(s):  
Aidong Xia ◽  
Jie Yin ◽  
Xiao Chen ◽  
Zhengren Huang ◽  
Xuejian Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Flexural Strength ◽  
Hot Pressing ◽  
Raw Materials ◽  
Secondary Phase ◽  
Pressing Temperature ◽  
Xrd Pattern ◽  
Mean Grain Size ◽  
The Mean

In this work, a (SiC-AlN)/ZrB2 composite with outstanding mechanical properties was prepared by using polymer-derived ceramics (PDCs) and hot-pressing technique. Flexural strength reached up to 460 ± 41 MPa, while AlN and ZrB2 contents were 10 wt%, and 15 wt%, respectively, under a hot-pressing temperature of 2000 °C. XRD pattern-evidenced SiC generated by pyrolysis of polycarbosilane (PCS) was mainly composed by 2H-SiC and 4H-SiC, both belonging to α-SiC. Micron-level ZrB2 secondary phase was observed inside the (SiC-AlN)/ZrB2 composite, while the mean grain size (MGS) of SiC-AlN matrix was approximately 97 nm. This unique nano-micron hybrid microstructure enhanced the mechanical properties. The present investigation provided a feasible tactic for strengthening ceramics from PDCs raw materials.

URSS/PVA/WP Composite Materials: Preparation and Performance

2014 ◽  
Vol 968 ◽  
pp. 80-83
Author(s):  
Chuan Bao Wu ◽  
Bo Qiao
Keyword(s):  
Tensile Strength ◽  
Composite Materials ◽  
Rice Straw ◽  
Hot Pressing ◽  
Vinyl Alcohol ◽  
Tensile Elongation ◽  
Environmentally Friendly ◽  
Waste Paper ◽  
Poly Vinyl Alcohol ◽  
And Performance

A novel kind of environmentally friendly composite materials containing upper part of rice straw segments (URSS), poly (vinyl alcohol) (PVA) and waste paper (WP) were prepared by hot-pressing at 140°C for 10 min. The tensile strength, tensile elongation and hardness of composites were measured. Results showed that the tensile strength and the strength at tensile break of the composites first increased and then decreased with increasing PVA content. Tensile strength was higher than the strength at tensile break at different PVA contents, indicating that URSS/PVA/WP composite materials had certain toughness. Otherwise, URSS/PVA/WP composite materials had higher tensile strength than URSS/PVA composites. The tensile strengths of them were respectively 9.25 MPa and 3.9 MPa when prepared at PVA content of 40%. The hardness of composites lay between 90 and 96. Negligible difference exists in every composite.

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 Season Factor in the Preparation of PVA/RS Composite

2014 ◽  
Vol 881-883 ◽  
pp. 1171-1174
Author(s):  
Chuan Bao Wu
Keyword(s):  
Tensile Strength ◽  
Rice Straw ◽  
Hot Pressing ◽  
Vinyl Alcohol ◽  
Tensile Fracture ◽  
Poly Vinyl Alcohol ◽  
Comparison Results ◽  
Winter Sample ◽  
Summer Sample

The effect of season factor on the performances of poly (vinyl alcohol)/rice straw (PVA/RS) composites prepared by hot-pressing was studied. Two forms of RS, including shortcut RS and RS wires, were used to prepare composite. For PVA/ shortcut RS composites, samples of winter showed higher tensile strength and strength at tensile fracture at different PVA contents than that of summer. When PVA content is 50%, tensile strength of winter sample is 136% higher than that of summer sample and strength at tensile fracture of winter sample is 320% higher than that of summer sample. In addition, samples of winter showed lower tensile stretch and higher hardness at different PVA contents than that of summer. For PVA/RS wire composites, the comparison results are similar. These indicated that season is an important factor for preparing plant based composite with PVA as adhesive.

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.

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