The Effects of Thermal Consolidation Methods on PET Nonwoven Composites for Thermal Insulation Use

2008 ◽  
Vol 55-57 ◽  
pp. 405-408 ◽  
Author(s):  
Ching Wen Lou ◽  
Ching Wen Lin ◽  
Chia Chang Lin ◽  
S.J. Li ◽  
I.J. Tsai ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Energy Consumption ◽  
Thermal Insulation ◽  
Aluminum Foil ◽  
Nonwoven Fabric ◽  
Nonwoven Fabrics ◽  
Available Energy ◽  
Needle Punching ◽  
Thermal Consolidation ◽  
Pet Fibers

As available energy sources have grown increasingly scarce, people have started paying attention to their energy consumption. Although many methods for power generation are being actively investigated, efficient methods for solving energy problems must be based on reducing energy consumption. Thermal insulation can decrease heat energy loss and conserve energy waste, especially in the construction, transportation and industrial fields. In this study, polyester (PET) hollow fibers were blended with various ratios of low-melting-point PET fibers (10%, 20%, 30%, 40% and 50%). The fibers were blended using opening, carding, laying and needle punching (150 needles/cm2, 225 needles/cm2 and 300 needles/cm2) to prepare PET nonwoven fabrics. The PET nonwoven fabrics were thermally plate pressed (TPP) and air-through bonding (ATB). Thermal conductivity, physical properties and air permeability were investigated to identify the influence of manufacturing parameters on the PET nonwoven fabrics. The experimental results show that needle punching density, TPP and ATB would influence the thermal conductivity of PET nonwoven fabric, because the structure of PET nonwoven fabric was changed. The optimal parameters of PET nonwoven fabric clipped with an aluminum foil was used to evaluate the influence of aluminum foil on thermal conductivity. The PET nonwoven composite in this study can be used in industrial thermal insulation applications.

scholarly journals Experimental and Modelling Studies on Thermal Insulation and Sound Absorption Properties of Cross-Laid Nonwoven Fabrics

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Tao Yang ◽  
Lizhu Hu ◽  
Xiaoman Xiong ◽  
Michal Petrů ◽  
Sundaramoorthy Palanisamy ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Absorption Coefficient ◽  
Thermal Insulation ◽  
Sound Absorption ◽  
Nonwoven Fabric ◽  
Sound Absorption Coefficient ◽  
Absorption Properties ◽  
Nonwoven Fabrics ◽  
Significant Difference ◽  
Modelling Studies

Abstract Nonwoven fabrics are widely used for thermal insulation and sound absorption purpose in construction and automobile fields. It is essential to investigate their thermal conductivity and sound absorption coefficient. Five cross-laid nonwoven fabrics are measured on the Alambeta device and Brüel & Kjær impedance tube. Bogaty and Bhattacharyya models are selected to predict the thermal conductivity, and Voronina and Miki models are used to predict the sound absorption coefficient. The predicted thermal conductivity shows a significant difference compared with the measured values. It is concluded that Bogaty and Bhattacharyya models are not suitable for high porous nonwoven fabric. In addition, the results of Voronina and Miki models for sound absorption prediction are acceptable, but Voronina model shows lower mean prediction error compared with Miki model. The results indicate that Voronina model can be used to predict the sound absorption of cross-laid nonwoven fabric.

scholarly journals A Study on the Entanglement and High-Strength Mechanism of Spunlaced Nonwoven Fabric of Hydrophilic PET Fibers

2013 ◽  
Vol 8 (4) ◽  
pp. 155892501300800 ◽  
Author(s):  
Hong Wang ◽  
Jingjing Zhu ◽  
Xiangyu Jin ◽  
Haibo Wu
Keyword(s):  
Tensile Strength ◽  
High Strength ◽  
Nonwoven Fabric ◽  
Fiber Content ◽  
Nonwoven Fabrics ◽  
Pull Out ◽  
Fundamental Research ◽  
Pet Fibers ◽  
Set Up

Spunlaced nonwoven fabrics have been widely used recently, but fundamental research on the spunlaced nonwoven process is relatively weak. It is inexplicit until now how fibers are entangled with each other during the hydroentangling process. In this paper, a pull-out experiment designed to study the entanglement properties of spunlaced nonwoven fabrics using common and hydrophilic PET fibers as objects is described. It was found that the broken fiber content can be used to represent the entanglement intensity of the spunlaced nonwoven fabrics. In addition, a formula was set up to calculate the tensile strength of the spunlaced nonwoven fabric based on its pull-out behavior.

scholarly journals Structural Applications of Thermal Insulation Alkali Activated Materials with Reduced Graphene Oxide

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1052
Author(s):  
Wu-Jian Long ◽  
Can Lin ◽  
Xiao-Wen Tan ◽  
Jie-Lin Tao ◽  
Tao-Hua Ye ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Graphene Oxide ◽  
Energy Consumption ◽  
Reduced Graphene Oxide ◽  
Thermal Insulation ◽  
Expanded Polystyrene ◽  
Information Modeling ◽  
Reduced Graphene ◽  
Structural Applications ◽  
Alkali Activated

Development of low thermal conductivity and high strength building materials is an emerging strategy to solve the heavy energy consumption of buildings. This study develops sustainable alkali activated materials (AAMs) for structural members from waste expanded polystyrene (EPS) beads and reduced graphene oxide (rGO) to simultaneously meet the thermal insulation and mechanical requirements of building energy conservation. It was found that the thermal conductivity of AAMs with 80 vol.% EPS and 0.04 wt.% rGO (E8–G4) decreased by 74% compared to the AAMs without EPS and rGO (E0). The 28-day compressive and flexural strengths of E8–G4 increased by 29.8% and 26.5% with the addition of 80 vol.% EPS and 0.04 wt.% rGO, compared to the sample with 80 vol.% EPS without rGO (E8). In terms of compressive strength, thermal conductivity, and cost, the efficiency index of E8–G4 was higher than those of other materials. A building model made from AAMs was designed using building information modeling (BIM) tools to simulate energy consumption, and 31.78% of total energy consumption (including heating and cooling) was saved in the building operation period in Harbin City, China. Hence, AAMs made of waste EPS beads and rGO can realize the structural and functional integrated application in the future.

Using unwrapped filament tows to strengthen sandwich composites: Puncture and bursting resistance

2018 ◽  
Vol 49 (10) ◽  
pp. 1374-1388
Author(s):  
Jia-Hsun Li ◽  
Ching-Wen Lou ◽  
Jing-Chzi Hsieh ◽  
Jia-Horng Lin
Keyword(s):  
Mechanical Performance ◽  
Nonwoven Fabric ◽  
Efficient Production ◽  
Sandwich Composites ◽  
Puncture Resistance ◽  
Nonwoven Fabrics ◽  
Multiple Parameters ◽  
Needle Punching ◽  
Custom Made ◽  
Single Pattern

The combination of appropriate materials and structural design can compensate for flaw of a single pattern, providing the products with better functionalities. In this study, the custom-made nonwoven fabric machine can unwrap the filament tows before needle punching stage. Sandwich composites are proposed, consisting of two nonwoven fabrics as surface layers and laminated loops of filaments as the core. The puncture resistance of the sandwich composites are examined in terms of weight of filament loops and needle-punching depth, examining their influences. The employment of filaments has a remarkable influence on the mechanical performance of the composites. GF4G has static puncture resistance, dynamic puncture resistance, and bursting strength that are 89%, 30%, 88% higher than those of GF1G; 332%, 127%, and 500% higher than those of 2G; and 671%, 400%, and 1260% higher than those of G. Using filaments to reinforce nonwoven fabrics only requires simple equipment and easy operation. Furthermore, based on the requirements of different final products, diverse filaments and multiple parameters can be combined, thereby providing the composites with efficient production, solid reinforcement, and broad applications.

scholarly journals Investigation about the Effect of Manufacturing Parameters on the Mechanical Behaviour of Natural Fibre Nonwovens Reinforced Thermoplastic Composites

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2560 ◽  
Author(s):  
Imen Gnaba ◽  
Peng Wang ◽  
Damien Soulat ◽  
Fatma Omrani ◽  
Manuela Ferreira ◽  
...  
Keyword(s):  
Mechanical Behaviour ◽  
Areal Density ◽  
Nonwoven Fabric ◽  
Natural Fibre ◽  
Thermoplastic Composites ◽  
Reinforced Composites ◽  
Nonwoven Fabrics ◽  
Composite Scale ◽  
Needle Punching ◽  
Manufacturing Parameters

To date, nonwoven fabrics made with natural fibres and thermoplastic commingled fibres have been extensively used in the composite industry for a wide variety of applications. This paper presents an innovative study about the effect of the manufacturing parameters on the mechanical behaviour of flax/PP nonwoven reinforced composites. The mechanical properties of nonwoven fabric reinforced composites are related directly to the ones of dry nonwoven reinforcements, which depend strongly on the nonwoven manufacturing parameters, such as the needle-punching and areal densities. Consequently, the influence of these manufacturing parameters will be analysed through the tensile and flexural properties. The results demonstrated that the more areal density the nonwoven fabric has, the more the mechanical behaviour can be tested for composites. By contrast, it has a complex influence on needle-punching density on the load-strain and bending behaviours at the composite scale.

Visualization of a pillar-shaped fiber bundle in a model needle-punched nonwoven fabric using X-ray micro-computed tomography

2016 ◽  
Vol 87 (11) ◽  
pp. 1387-1393 ◽  
Author(s):  
Tatsuya Ishikawa ◽  
KyoungHou Kim ◽  
Yutaka Ohkoshi
Keyword(s):  
Fiber Bundle ◽  
Three Dimensional ◽  
Nonwoven Fabric ◽  
Fiber Bundles ◽  
Dimensional Structure ◽  
Micro Computed Tomography ◽  
X Ray ◽  
Needle Punching ◽  
Pet Fibers ◽  
Polyethylene Fibers

In the needle-punching process, the barbs of a needle catch fibers and orient them along the thickness direction of the fabric. The oriented fibers form a pillar-shaped fiber bundle, which acts as a bonding point of the fabric. The structure of the pillar-shaped fiber bundle thus governs the mechanical properties of needle-punched nonwoven fabric, and both are largely affected by the needle-punching conditions. However, the three-dimensional structure of pillar-shaped fiber bundles and their development under different needle-punching conditions have not been revealed. In the present study, we visualized the three-dimensional structure of a pillar-shaped fiber bundle in needle-punched nonwoven fabric, employing X-ray micro-computed tomography (XCT) on the basis of the difference in the X-ray absorption coefficient between polyethylene terephthalate (PET) and polyethylene fibers. For a material density ratio of less than 1.4 and PET fibers having a diameter of 40 µm, the pillar-shaped bundles of PET fibers were visualized by erasing 20-µm polyethylene fibers in XCT images. Furthermore, we investigated the effects of the penetration depth of the needle on the development of pillar-shaped fiber bundles. The number of fibers constituting a pillar largely increased at a penetration depth of 19.0 mm, and pillars protruded from the bottom surface of the fabric and formed a stitch structure. The XCT applied in this study is thus effective in analyzing the structure of pillar-shaped fiber bundles quantitatively without affecting the structure of the nonwoven fabric.

Mechanical and Electrical Properties of the Polyaniline (PANI)/Polylactic Acid (PLA) Nonwoven Fabric

2013 ◽  
Vol 365-366 ◽  
pp. 1074-1077 ◽  
Author(s):  
Chin Mei Lin ◽  
Ching Hui Lin ◽  
Yu Tien Huang ◽  
Ching Wen Lou ◽  
Jia Horng Lin
Keyword(s):  
Mechanical Properties ◽  
Electromagnetic Wave ◽  
Melting Point ◽  
Polylactic Acid ◽  
Nonwoven Fabric ◽  
Consumer Products ◽  
Layer Number ◽  
Nonwoven Fabrics ◽  
Mechanical And Electrical Properties ◽  
Needle Punching

Technical development and rapid telecommunication create convenient consumer products, but produce electromagnetic radiation that hurts the human body, which makes the development of antistatic and electromagnetic-wave-resistant textiles important. This study combines polylactic acid (PLA) fibers and low melting point polylactic (LPLA) fibers by needle punching to make PLA nonwoven fabrics. The lamination layer number is then changed to explore its influence on the mechanical properties of the PLA nonwoven fabrics. Next, the nonwoven fabrics are spray-coated with polyaniline (PANI) to form the PANI/PLA nonwoven fabrics. The PANI/PLA nonwoven fabric with a lamination layer number of 5 has the optimum tensile and tear strength. A coating of PANI can reduce the surface resistivity.

scholarly journals Development of Needle-Punched Nonwoven Fabrics from Natural Fibers for Sound Absorption Behavior

2021 ◽  
Author(s):  
K Savitha ◽  
Grace S Annapoorani ◽  
V R Sampath
Keyword(s):  
Thermal Conductivity ◽  
Sound Absorption ◽  
Fiber Strength ◽  
Natural Fibers ◽  
Areal Density ◽  
Fiber Layer ◽  
Nonwoven Fabrics ◽  
Sesbania Grandiflora ◽  
Needle Punching ◽  
Needle Punching Machine

: The natural fibers prepared from plant waste have parameters like fiber strength, length, and chemical composition which are suitable to fabric and the fibers into nonwoven. The selected plants were identified from their botanical names by comparing the collected samples with those of known identity in the herbarium of a botanical survey in India with their names as Sesbania grandiflora, Mutingia Calabura, and Bauhinia Purpurea. A novel Portable multi-fibre decorticator machine was fabricated and used to extract the fibers from the plant stem and barks. The extracted fibers are done physical characterization and their properties are investigated. The extracted fibers are blended with other natural fibers like jute and flax in appropriate proportions 45:45:10 and nonwoven fabrics were prepared by the needle-punching method. Three and four-layer nonwovens are produced using a needle punching machine. The developed nonwovens are tested using standard apparatus and the effect of natural fibers in areal density, thickness; bulk density, porosity, and air permeability are analyzed. In addition, thermal conductivity and sound absorption behaviour are also investigated. The sound absorption property increases concerning areal density and fabric thickness. The thermal conductivity increased by increasing the fiber layer in the fabric to evaluate its potential as a protective barrier material in non-woven face masks.

Evaluation of Mechanical Properties of Dimpled PET Fiber Fabricated by Electrospinning Method

2018 ◽  
Vol 940 ◽  
pp. 8-14
Author(s):  
Kazuto Tanaka ◽  
Ryota Kawasaki ◽  
Tsutao Katayama ◽  
Yusuke Morita
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Stent Graft ◽  
Porous Scaffold ◽  
Fiber Surface ◽  
Nonwoven Fabric ◽  
Nonwoven Fabrics ◽  
Electrospinning Method ◽  
Pet Fibers ◽  
High Humidity Environment

Insufficient endothelialization of stent grafts tends to cause a problem of thrombosis formation. Because the structure of nanofibers, generally defined as fibers with a diameter below 1 μm, resembles the structure of an extracellular matrix, nanofibers are applied to scaffolds for regenerative medicine. Using nanofibers as the covering material of the stent graft can be expected to solve the problem of the stent graft. Previous studies have shown that a porous scaffold offers better surfaces to anchor and culture endothelial cells than a nonporous scaffold. Therefore, fibers with nanoorder dimples are expected to promote endothelialization. As a method of forming the dimple shape on the surface of the PET fiber, there is a method utilizing a difference in the volatilization rate of the solvent in the high humidity environment in the electrospinning method. For practical application of the stent graft to artificial blood vessels, the mechanical properties of the dimpled PET fiber should be clarified. In this study, the mechanical properties of single nanofibers and nonwoven fabrics of PET fibers with dimples on their surface were evaluated by tensile test. By forming the dimple shape on the fiber surface, the tensile strength of single PET fibers with dimples was 90 % lower than that of single PET fibers with a smooth surface. In the fabrication process of nonwoven fabric, the addition of EG delayed the volatilization of the PET solution, and the fibers adhered to each other. The bonding between the fibers contributed to the tensile strength of the nonwoven fabric.

scholarly journals The Influences of Hydrophilic Finishing of PET Fibers on the Properties of Hydroentangled Nonwoven Fabrics

2010 ◽  
Vol 5 (4) ◽  
pp. 155892501000500 ◽  
Author(s):  
Wang Hong ◽  
Pang Lianshun ◽  
Jin Xiangyu ◽  
Yin Baopu ◽  
Wu Haibo
Keyword(s):  
Nonwoven Fabric ◽  
Polyester Fiber ◽  
Nonwoven Fabrics ◽  
Polyester Fibers ◽  
Pet Fibers

Common polyester fibers are hydrophobic in nature. Thus it is hard to process the fibers in the hydroentangled nonwoven process and the resultant nonwoven fabric is hydrophobic as well. In this paper, two kinds of polyester fibers treated with different hydrophilic finishing agents and one common polyester fiber were formed into nonwoven fabrics by using hydroentanglement process. The influences of the hydrophilic and friction properties of the PET fibers on the properties of hydroentangled nonwoven fabrics were studied.

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