scholarly journals Effects of Hot-Press Temperature and Mix Proportions on Mechanical Behaviours of Hybrid Coconut Fibre Particleboard

2021 ◽  
Vol 1153 (1) ◽  
pp. 012019
Author(s):  
D N Tawasil ◽  
E Aminudin ◽  
H A S Lim ◽  
L P Chung ◽  
N M Z N Soh
Keyword(s):  
Hot Press ◽  
Press Temperature ◽  
Mechanical Behaviours ◽  
Coconut Fibre

Investigation on the microstructural characteristics and quasi-static puncture resistance of both domesticated and wild silkworm cocoons

2020 ◽  
Vol 90 (23-24) ◽  
pp. 2714-2726
Author(s):  
Xuanxuan Zhou ◽  
Wenfang Song ◽  
Yehu Lu
Keyword(s):  
Fractal Theory ◽  
Fractal Dimensions ◽  
Linear Increase ◽  
Hot Press ◽  
Antheraea Mylitta ◽  
Puncture Resistance ◽  
Press Temperature ◽  
Puncture Force ◽  
Wild Silkworm ◽  
Silkworm Cocoon

The very thin and lightweight silkworm cocoon has outstanding mechanical properties attributed to its specific composite microstructure. However, the microstructures of the cocoons have not been studied quantitatively, and their anti-puncture performance has not been examined as well. In this study, both domesticated ( Bombyx mori) and wild silkworm cocoons ( Antheraea pernyi, Antheraea mylitta and Samia canningi) were investigated for their microstructures using fractal theory, and their quasi-static puncture resistance was tested and compared. In addition, the effects of cocoon layers and hot-press treatments on the puncture resistance of two cocoon types ( B. mori and A. pernyi) were investigated. The three wild cocoons demonstrated significantly higher fractal dimensions, higher fiber intersectional densities and low porosities, indicating their structures are more optimized. They also displayed better puncture resistance than B. mori. Increased layer numbers could significantly increase the puncture resistance of both cocoon types and A. pernyi showed more remarkable increases. Moreover, the two cocoon types showed optimum puncture resistance after heat treatment with hot-press temperature of 135℃ and pressure of 25 MPa, and A. pernyi showed better puncture resistance after such treatment. Finally, both the maximum puncture force and puncture energy of cocoons displayed a linear increase with the increasing fractal dimensions. The new insights can guide the development of novel protective fiber composites with desirable and predictable anti-puncture performance.

Effect of hot press temperature on β-phase, dielectric and ferroelectric properties of solvent casted Poly(vinyledene fluoride) films

2019 ◽  
Vol 6 (9) ◽  
pp. 095306 ◽  
Author(s):  
Sakti Prasanna Muduli ◽  
S Parida ◽  
S K Rout ◽  
Shailendra Rajput ◽  
Manoranjan Kar
Keyword(s):  
Ferroelectric Properties ◽  
Hot Press ◽  
Press Temperature ◽  
Β Phase

Microstruciture and Properties of Intermetallic Matrix Composites Produced by Reaction Synthesis

1994 ◽  
Vol 350 ◽  
Author(s):  
D. E. Alman ◽  
J. A. Hawk ◽  
C. P. Dogan ◽  
M. Ziomek-Moroz ◽  
A. V. Petty
Keyword(s):  
Alkaline Solutions ◽  
Reaction Synthesis ◽  
Matrix Composites ◽  
Reaction Products ◽  
Hot Press ◽  
Press Temperature ◽  
Intermetallic Matrix ◽  
Microstructural Evaluation ◽  
Intermetallic Matrix Composites

AbstractIn this US Bureau of Mines study, a variety of TiAl based composites were produced in situ by reaction synthesis. Mixtures of elemental Ti, Al and B and Ti, Al, and Si powders were reactive hot-pressed to form TiAl reinforced with 10, 20, 25 or 60 vol. pct. TiB2 or Ti5Si3. Microstructural evaluation of the resultant composites confirmed that the reaction products were primarily TiAl and TiB2 or Ti5S3, with a small amount of Ti3Al. The hot-press temperature and pressure had a significant effect on the density of the composites. In general, higher temperatures and initiating the reaction under pressure promoted dense composites. Room temperature biaxial flexure strength tests indicated that the addition of the reinforcing phases can improve the strength of TiAl. Potentiodynamic experiments revealed that TiAl, TiAl+TiB2 and TiAl+Ti5Si3 composites display active-passive corrosion behavior in both acidic and alkaline solutions.

Investigation of a formaldehyde-free cottonseed flour-based adhesive for interior plywood

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 5546-5557
Author(s):  
Nairong Chen ◽  
Jian Huang ◽  
Kaichang Li
Keyword(s):  
Hot Pressing ◽  
Water Resistance ◽  
Weight Ratio ◽  
Wood Adhesive ◽  
Hot Press ◽  
Cottonseed Flour ◽  
Press Temperature ◽  
Pressing Time ◽  
Effects Of Ph ◽  
Pot Life

A new formaldehyde-free wood adhesive, primarily composed of defatted cottonseed flour (CF) and polyamine-epichlorohydrin (K736) resin, was investigated for the preparation of interior plywood. Sodium hydroxide was an essential component of the adhesive. The effects of pH values of the CF-K736 adhesive, the CF/K736 weight ratio on the pot life of the adhesive, and the water resistance of the resulting plywood panels were investigated in detail. The hot-pressing temperature and time were optimized in terms of the water resistance of the resulting plywood panels. The resulting 5-ply plywood panels met the industrial water resistance requirements for interior application under the following conditions: pH > 11, CF/K736 weight ratio in the range of 8/1 to 5/1, hot-press temperature ≥ 120 °C, and hot-pressing time > 4 min. The pot life of the adhesive was approximately 3 h when the pH was 12 and the CF/K736 weight ratio was 8/1. The curing mechanism of the adhesive is discussed.

Optimization of Processing Variables in Wheat Straw Particleboard for Manufacturing Pallets

2012 ◽  
Vol 200 ◽  
pp. 335-338 ◽  
Author(s):  
Peng Luo ◽  
Chuan Min Yang ◽  
Hong Wei Ji
Keyword(s):  
Wheat Straw ◽  
Steam Explosion ◽  
High Performance ◽  
Low Cost ◽  
Urea Formaldehyde ◽  
National Standard ◽  
Hot Press ◽  
Board Density ◽  
Press Temperature ◽  
Uf Resin

The goal of this work was to make particleboards for manufacturing pallets from wheat straw using low cost urea formaldehyde (UF) resin adhesive. The wheat straws were subject to steam explosion pretreatment to improve bondability with UF resin. Particleboards were obtained from the steam explosion pretreated wheat straws with UF resin. Particleboard manufacturing parameters, such as pressing time, temperature and board density, were optimized to achieve high performance panel board for pallets. The optimum parameters were found to be: hot press temperature 170 °C, hot press time 40 s/mm, resin application ratio 10%, and straw particle size 12 mm. Under the optimum conditions particleboards met the mechanical requirements for the industrial use particleboards based on the Chinese National Standard for Particleboard and were able to make pallets.

Understanding and manipulating the intrinsic point defect in α-MgAgSb for higher thermoelectric performance

2016 ◽  
Vol 4 (43) ◽  
pp. 16834-16840 ◽  
Author(s):  
Zihang Liu ◽  
Huiyuan Geng ◽  
Jun Mao ◽  
Jing Shuai ◽  
Ran He ◽  
...  
Keyword(s):  
Point Defect ◽  
First Principles ◽  
Thermoelectric Performance ◽  
Intrinsic Point Defect ◽  
First Principles Calculations ◽  
Recovery Effect ◽  
Hot Press ◽  
Defect Engineering ◽  
Press Temperature

Thorough first-principles calculations reveal that an Ag vacancy is the dominant intrinsic point defect in α-MgAgSb. Point-defect engineering can be realized via rationally controlling the hot press temperature due to the recovery effect.

Poly (Lactic Acid)/Wood Fibers Biodegradable Composites

2010 ◽  
Vol 44-47 ◽  
pp. 2283-2287
Author(s):  
Ming Hui Guo ◽  
Yuan Yuan
Keyword(s):  
Lactic Acid ◽  
Water Resistance ◽  
Wood Fiber ◽  
Poly Lactic Acid ◽  
Flexural Properties ◽  
Wood Fibers ◽  
Hot Press ◽  
Press Temperature ◽  
Biodegradable Composites ◽  
Properties Of Composites

In our research, a commercial poly (lactic acid) (PLA) film was used in combination with wood fiber matrix to generate biodegradable composites by a film stacking technique and hot-press. The results showed the flexural properties and water resistance increased with the increasing of PLA addition. Silane-treated wood fiber composites significantly improved the flexural properties compared to untreated composites. In experiment range, the physical and mechanical properties of composites were better in higher hot-press temperature. The optimal parameters are determined by PLA addition 20%, silane addition 3%, the hot-press temperature 190°C, the hot-press time 10min.Under these parameters, the flexural properties of composites exceeded the requirement of the outdoor boards’ standard, but the water resistance was a little low.

A New Interior Plywood Adhesive Based on Oil -Tea Cake

2011 ◽  
Vol 194-196 ◽  
pp. 2183-2186 ◽  
Author(s):  
Dong Bin Fan ◽  
Te Fu Qin ◽  
Fu Xiang Chu
Keyword(s):  
Shear Strength ◽  
Phenol Formaldehyde ◽  
Low Cost ◽  
Hot Press ◽  
Standard Requirement ◽  
Press Temperature ◽  
Industry Standard ◽  
Optimum Formulation ◽  
Press Time ◽  
Addition Level

The oil-tea cake, as the major byproduct of tea oil production, was used with phenol-formaldehyde (PF) resin to prepare a mixed interior plywood panel adhesive (TC-PF adhesive). The optimum formulation of this adhesive and the optimum hot-press conditions for making plywood panels were investigated in this work. The results showed that wet shear strength value of TC-PF adhesives increased when the addition level of PF resin increased. TC-PF adhesive with 50% PF resin addition had a relatively low cost, and moreover pass the bonding strength requirement of China Industry Standard for interior plywood panels. Hot-press temperature and hot-press time had obvious influence on bonding performances of plywood panels. When the hot-press temperature was in the range of 140°C-160°C, the wet shear strength value of panels bonded with the adhesives passed the China Industry Standard requirement. At 3-5min of hot-press time, the plywood panels had satisfactory wet shear strength.

Fast Curing Phenol-Formaldehyde Resin Catalyzed by a Complex Catalyst

2010 ◽  
Vol 113-116 ◽  
pp. 2124-2128 ◽  
Author(s):  
Shi Feng Zhang ◽  
Jian Zhang Li ◽  
Xiao Ying Liu ◽  
Yan An Ou ◽  
Qiang Gao
Keyword(s):  
Bonding Strength ◽  
Phenol Formaldehyde ◽  
Formaldehyde Emission ◽  
National Standards ◽  
Curing Temperature ◽  
Formaldehyde Resin ◽  
Hot Press ◽  
Scanning Calorimetry ◽  
Complex Catalyst ◽  
Press Temperature

For increasing the curing rate and decreasing the curing temperature, modified phenol-formaldehyde (PF) resins were synthesized under a complex catalyst. The bonding strength and formaldehyde emission of the plywood bonded by them were measured according to Chinese National Standards methods. The curing behavior was conducted by differential scanning calorimetry (DSC) measurement. The results indicate that PF resins catalyzed by the complex catalyst show more moderate pH values, lower curing temperature and shorter gel time comparing with control ones. Plywood bonded with modified PF resins shows good bonding strength and low formaldehyde emission even at low hot press temperature (110 °C), which is closed to the plywood bonded with normal control PF resin at high hot press temperature (130 °C).

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