scholarly journals Tensile Strength and Dispersibility of Pulp/Danufil Wet-Laid Hydroentangled Nonwovens

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3931
Author(s):  
Chao Deng ◽  
R. Hugh Gong ◽  
Chen Huang ◽  
Xing Zhang ◽  
Xiang-Yu Jin
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Fiber Length ◽  
Water Jet ◽  
Pulp Fibers ◽  
Wet Strength ◽  
Blend Ratio ◽  
Sewage Systems

Wet-laid hydroentangled nonwovens are widely used for disposable products, but these products generally do not have good dispersibility and can block sewage systems after being discarded into toilets. In this study, both pulp fibers and Danufil fibers are selected as we hypothesize that the high wet strength and striated surface of Danufil fibers would allow us to produce nonwovens with better dispersibility while having enough mechanical properties. The wet strength and dispersibility of nonwovens are systematically studied by investigating the influence of the fiber blend ratio, fiber length, and water jet pressure. The results indicate that the percent dispersion could be as high as 81.3% when the wet strength is higher than 4.8 N, which has been improved greatly comparing the percent dispersion of 67.6% reported before.

scholarly journals Thermal and Mechanical properties of epoxy-jute fiber composite

2014 ◽  
Vol 27 (2) ◽  
pp. 77-82 ◽  
Author(s):  
H Ahmad ◽  
MA Islam ◽  
MF Uddin
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Tensile Strength ◽  
Fiber Length ◽  
Epoxy Composite ◽  
Fiber Composite ◽  
Young Modulus ◽  
Fiber Content ◽  
Jute Fiber ◽  
Elongation At Break

Chopped jute fiber-epoxy composites with varying fiber length (2-12 mm) and mass fraction (0.05-0.35) had been prepared by a heat press unit. The cross-linked product was characterized in terms of specific gravity, thermal conductivity, tensile strength, Young modulus and elongation at break. The transverse thermal conductivities for randomly oriented fibers in the composite were investigated by Lees and Charlton’s method. The tensile strength, Young modulus and elongation at break were investigated by a Universal Tensile Tester. With an increase in the fiber content (irrespective of the fiber length), the thermal conductivity of the composite decreases; the decreasing rate being highest for the fiber length of 2 mm followed by that for the fiber length of 6 and 12 mm. The decreasing rate of the thermal conductivity of the jute-epoxy composite is comparatively higher to that reported in literature for acrylic polymer hemp fiber composite. The tensile strength also decreases with the increase of the fiber content in the composite. The fiber length does not show to have significant effect on the tensile strength of the composite; the variation in strength being masked within experimental error. The Young modulus increases with the increase of fiber content within elastic limit; showing the highest values for the fiber length of 6 mm followed by those for the fiber length of 2 mm and 12 mm. The elongation at break shows slightly increasing trend up to 15% fiber content, but beyond that it decreases drastically. The specific gravity decreases with the increase in the fiber content and thus the recalculated specific tensile strength is found to keep at a stable level of 36MPa up to the fiber content of 20%, and beyond that the specific tensile strength decreases with the increase in the fiber content. It is concluded that jute fiber-epoxy composite could be used as a good heat-insulating material. Further investigation is recommended on the improvement of the thermal insulation keeping the mechanical properties unchanged or even improved. The TGA study is also required to ascertain the field of application of the material. DOI: http://dx.doi.org/10.3329/jce.v27i2.17807 Journal of Chemical Engineering, IEB Vol. ChE. 27, No. 2, December 2012: 77-82

The effect of fiber dimensions on fiber network activation and tensile strength

Holzforschung ◽  
2012 ◽  
Vol 66 (1) ◽  
Author(s):  
Iiro Pulkkinen ◽  
Ville Alopaeus
Keyword(s):  
Tensile Strength ◽  
Wall Thickness ◽  
Fiber Length ◽  
Fiber Quality ◽  
Pulp Fibers ◽  
Fiber Network ◽  
Network Activation ◽  
Fiber Wall ◽  
Technical Properties ◽  
Comparison Of The Results

Abstract The objective of this work was to check the fiber network activation parameter developed earlier by the authors for eucalypt pulp fibers to predict technical properties of paper. The fiber size analyses were performed with an optical fiber analyzer that applies 2D image analysis techniques on single fibers. The effects of fiber length, fiber width, fiber wall thickness, and fiber curl distributions on the quality potential of eucalypt fibers were evaluated. Fiber curl and fiber wall thickness based parameters were found to have a high potential for evaluation of eucalypt fiber quality. The variations in technical properties of paper were explained with differences in fiber wall thickness and fiber curl distributions. When the model was tested against industrial long fiber pulps, a further modification for fiber length was needed. The Page tensile strength model and the shear-lag theory were applied for comparison of the results obtained by the network activation model. With the approach presented in this article, the strength characteristics of hardwood and softwood pulps can be easily evaluated based on fiber geometry and water retention value.

scholarly journals Sifat Mekanik Beton Serat Ijuk yang Terendam Air Laut

2019 ◽  
Vol 5 (2) ◽  
pp. 102
Author(s):  
Chaeril Anwar ◽  
Erniati Bachtiar ◽  
Nur Khaerat Nur
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Fiber Length ◽  
Sea Water ◽  
Optimum Length ◽  
Normal Concrete ◽  
Split Tensile Strength ◽  
Fiber Concrete ◽  
Research Challenge

This research aims to determine the value of mechanical properties in fiber fibers which are submerged in seawater and to find out the optimum length of fiber fibers to the mechanical properties of fiber fibers which are submerged in sea water. The method used is an experimental method carried out in the laboratory by varying the length of the fibers, which is 25 mm; 50 mm; 75 mm; and 100 mm with 4% fiber addition. Tests of mechanical properties carried out in the form of compressive strength, split tensile strength, and flexural strength. The results of the research challenge the palm fiber-concrete that the longer the fibers used in the concrete, the mechanical properties decrease. Fiber concrete submerged in seawater has higher mechanical properties than normal concrete. Optimum fiber length length in fiber concrete from the results of this study is 25 mm.

scholarly journals Improvement of the Mechanical Properties of Hibiscus Esculentus (Okra) Fiber Reinforced Polymer Composite

2019 ◽  
pp. 249-259
Author(s):  
D. I. Chukwuma ◽  
E. N. Ikezue ◽  
E. O. Onu ◽  
J. O. Ezeugo
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Fiber Length ◽  
Natural Fiber ◽  
Volume Fraction ◽  
Fiber Surface ◽  
Fiber Volume ◽  
The Matrix ◽  
Two Parameters ◽  
Okra Fiber

Natural fiber and their composites are the emerging trends in material science. They are speedily gaining grounds in the replacement of synthetic reinforcements. This is due to their low density, high specific mechanical strength, ultimate availability and disposability and less processing requirements. Most plant based fibers have become centers of research. This work is based on Okra fiber. Okra fiber was used as reinforcement in vinyl ester polymer matrix. Okra fiber was chemically treated using NaOH to clean fiber surface, modify the surface to increase the surface roughness and in general enhance bond strength between fiber and matrix. Reinforcement of the matrix using Okra fiber increases mechanical properties of the composite. But for optimal result, certain parameters were considered and varied. The two parameters considered were: fiber length, and proportion or volume fraction. Different variations of fiber length considered were: 10mm, 30mm and 50mm while the different fiber volume fractions considered are 10%, 30% and 50%. This work has analyzed how these parameters can be best combined for optimum values of tensile properties of the composite. The tensile strength of composite was highest at fiber length of 50mm and volume fraction of 10% at ultimate tensile strength of 214MPa.

scholarly journals Assessment of NR/EPDM Blend Ratio using Graphical Method

2019 ◽  
Vol 8 (12) ◽  
pp. 2358-2362
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Approximate Solution ◽  
Mechanical Characteristics ◽  
Graphical Method ◽  
Ethylene Propylene Diene Monomer ◽  
Electrical Characteristics ◽  
Blend Ratio ◽  
Elongation At Break ◽  
Weathering Resistance

In this proposed work, Natural Rubber (NR) and Ethylene Propylene Diene Monomer (EPDM) are blended using Graphical method in 50:50 ratio. The blends are characterized by electrical characteristics like surface resistivity, arc resistance and mechanical properties such as comparative tracking index, elongation at break and tensile strength as per standard ASTM and IEC. Graphical method type of blending overcomes the drawback of Optimal Blend Ratio (OBR) which gives an approximate solution. The composite blended gives good electrical, mechanical characteristics with good weathering resistance.

Effect of Fiber Parameters on the Mechanical Properties of Banana-Glass Fiber Hybrid Composites

2014 ◽  
Vol 592-594 ◽  
pp. 202-205
Author(s):  
V. Santhanam ◽  
M. Chandrasekaran ◽  
N. Venkateshwaran
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Glass Fiber ◽  
Fiber Length ◽  
Natural Fiber ◽  
Volume Fraction ◽  
Hybrid Composites ◽  
Natural Fibers ◽  
Weight Ratio ◽  
Synthetic Fiber

Composite materials are widely used for their superior properties such as high strength to weight ratio, high tensile strength, low thermal expansion, low density etc. Due to environmental issues the eco-friendly composites are being explored. Natural fibers as reinforcement for polymer composites are widely studied. But natural fibers lack better mechanical properties when compared with synthetic fibers. Hence mixing the natural fiber with a synthetic fiber such as glass fiber will improve mechanical properties of the composites. In this study banana fiber is mixed with glass fiber, and the mixture is used as reinforcement in epoxy matrix. The composite specimens were prepared using hand layup technique, the fibers were randomly oriented. Further the fiber length was varied as 10, 15, 20 and 25mm and volume fraction as 10%, 15%, 20% and 25%. Experiments were conducted to find the effect of fiber length and volume fraction on tensile strength, flexural strength, water absorption properties of the composites. It is observed that a fiber length of 20mm and 20% fiber volume fraction gave better mechanical properties.

scholarly journals The Effect of Fiber Length on Tensile Properties of Polyester Resin Composites Reinforced by the Fibers of Sansevieria trifasciata

2014 ◽  
Vol 8 ◽  
pp. 7-13 ◽  
Author(s):  
Palla Hari Sankar ◽  
Y.V. Mohana Reddy ◽  
K. Hemachandra Reddy ◽  
M. Ashok Kumar ◽  
A. Ramesh
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Tensile Properties ◽  
Tensile Testing ◽  
Fiber Length ◽  
Polyester Resin ◽  
Resin Composites ◽  
Elongation At Break ◽  
Polyester Composites ◽  
Scanning Electron

This paper presents the study of the tensile properties of Sansevieria trifasciata – fiber (here after called STF) reinforced polyester composites. The composite sample was fabricated with five different fiber lengths of STF (2, 4, 6, 8 and 10 mm). The fabrication was made by hand lay-up technique. Mechanical properties were determined using tensile testing. An interact between fiber and matrix was observed from the SEM (scanning electron microscope) micrographs. The study reveals that the tensile strength increased with fiber length without effecting the elongation at break of the composite.

scholarly journals An Investigation on Adding Polypropylene Fibers to Reinforce Lightweight Cement Composites (LWC)

2012 ◽  
Vol 7 (4) ◽  
pp. 155892501200700 ◽  
Author(s):  
Roohollah Bagherzadeh ◽  
Hamid Reza Pakravan ◽  
Abdol-Hossein Sadeghi ◽  
Masoud Latifi ◽  
Ali Akbar Merati
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Flexural Strength ◽  
Fiber Length ◽  
Lightweight Concrete ◽  
Physical And Mechanical Properties ◽  
Splitting Tensile Strength ◽  
Hardened Concrete ◽  
Polypropylene Fibers ◽  
Cement Composites

The influence of polypropylene fibers has been studied in different proportioning and fiber length to improve the performance characteristics of the lightweight cement composites. Fibers used in two different lengths (6mm and 12mm) and fiber proportions (0.15% and 0.35%) by cement weight in the mixture design. Hardened concrete properties such as: 7- and 28-day compressive strength, splitting tensile strength, flexural strength, water absorption, and shrinkage were evaluated. Fiber addition was seen to enhance the physical and mechanical properties of lightweight concrete. Compared to unreinforced LWC, polypropylene (PP) reinforced LWC with fiber proportioning 0.35% and 12 mm fiber length, caused 30.1% increase in the flexural strength and 27% increase in the splitting tensile strength. Increased fiber availability in the LWC matrix, in addition to the ability of longer PP fibers to bridge on the micro cracks, are suggested as the reasons for the enhancement in mechanical properties.

Repulping of wet strength paper towel with potassium monopersulfate

TAPPI Journal ◽  
2020 ◽  
Vol 19 (9) ◽  
pp. 463-470
Author(s):  
R. YANG ◽  
C. LUETTGEN
Keyword(s):  
Sodium Hypochlorite ◽  
Fiber Length ◽  
Equivalent Amount ◽  
Pulp Fibers ◽  
Wet Strength ◽  
Fines Content ◽  
Physical Strength ◽  
Paper Towel

Potassium monopersulfate (KMPS) was used in repulping of polyamide-epichlorohydrin (PAE)-containing paper towel. The effectiveness of the repulping aid was compared with that of sodium hypochlorite. Addition of a 2.4% KMPS repulping aid achieved complete repulping of the paper towel, resulting in 88% screen yield and about 5% rejects. To reach a similar pulping result, two times the oxidative equivalent amount of sodium hypochlorite had to be used. Compared to the pulp fibers obtained from sodium hypochlorite repulping, those obtained from KMPS repulping had higher physical strength, longer fiber length, and lower fines content. This study demonstrated that KMPS was superior to sodium hypochlorite in repulping of PAE-containing paper towel in terms of effectiveness and pulp quality.

Phase Transformations in Ti-7w/oMo-3w/oMe Alloy

1974 ◽  
Vol 32 ◽  
pp. 514-515
Author(s):  
S. Fujishiro
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Transmission Electron Microscopy ◽  
Tensile Strength ◽  
Mechanical Processing ◽  
Ray Method ◽  
X Ray ◽  
Transmission Electron ◽  
Water Quench ◽  
Alpha Beta

The mechanical properties of three titanium alloys (Ti-7Mo-3Al, Ti-7Mo- 3Cu and Ti-7Mo-3Ta) were evaluated as function of: 1) Solutionizing in the beta field and aging, 2) Thermal Mechanical Processing in the beta field and aging, 3) Solutionizing in the alpha + beta field and aging. The samples were isothermally aged in the temperature range 300° to 700*C for 4 to 24 hours, followed by a water quench. Transmission electron microscopy and X-ray method were used to identify the phase formed. All three alloys solutionized at 1050°C (beta field) transformed to martensitic alpha (alpha prime) upon being water quenched. Despite this heavily strained alpha prime, which is characterized by microtwins the tensile strength of the as-quenched alloys is relatively low and the elongation is as high as 30%.

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