23 results on '"Lou, Ching-Wen"'
Search Results
2. Preparation and mechanical properties characterization: plasma‐modified expanded vermiculite/fabric‐reinforced foam composite materials.
- Author
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Li, Ting‐Ting, Yang, Yandong, Dai, Wenna, Wang, Hongyang, Wang, Jie, Lou, Ching‐Wen, and Lin, Jia‐Horng
- Subjects
COMPOSITE materials ,FOAM ,IMPACT loads ,CUSHIONING materials ,DYNAMIC testing ,PLASMA materials processing - Abstract
Expanded vermiculite (EV) powder was treated with a plasma, and the organic material polyurethane (PU) was combined with the inorganic material EV powder and fabric by means of particle reinforcement and surface reinforcement to prepare a PU cushioning composite material. EV was processed with plasma treatment beforehand. The resulting PU foam cushioning composites were evaluated for static compression performance and dynamic buffering performance, thereby examining the influences of plasma treatment time and fabric type. According to the correlation between the structure and compression performance, the presence of EV provides more nucleation sites during the foaming, which in turn increases the cell density and the compression performance of the PU cushioning composites. In particular, after plasma treatment of 800‐mesh EV for 20 and 30 min, the resulting composite foam had reduced cell diameter and increased density, and enhanced mechanical properties. Besides, in terms of surface reinforcement, covering the surface with fabric will make the foam enter the densification stage in advance, and its compression performance will be enhanced. As for the dynamic cushioning test, the surface‐covering fabric can increase the impact performance, and the foam cushioning material covered with double‐sided fabric is better. Specifically, PU foam covered with warp‐knitted spacer fabric on both sides exhibits a maximal dynamic compression performance as the impact load is attenuated to 5941 N, suggesting an energy absorption of 96.20%. © 2021 Society of Chemical Industry [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
3. Plastic packaging materials of laminated composites made of polymer cover sheets and a nonwoven interlayer.
- Author
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Lin, Mei-Chen, Lin, Jia-Horng, Lin, Jan-Yi, Lin, Ting An, and Lou, Ching-Wen
- Subjects
PACKAGING materials ,LAMINATED materials ,PLASTICS ,PLASTICS in packaging ,COMPOSITE materials ,LAMINATED plastics ,THERMOPLASTIC composites ,POLYPHENYLENETEREPHTHALAMIDE - Abstract
This study aims to improve the mechanical properties, stabilized structures, and light weight plastic packaging materials to realize diverse applications. A sheet extrusion machine is used to fabricate sandwich-structured composites, which are composed of two polymer cover sheets and a nonwoven interlayer. The samples are prepared in two batches with different cover sheets: thermoplastic polyurethane and polypropylene. Moreover, low-melting-point polyester (LMPET) fibers and Kevlar fibers are fabricated into a LMPET/Kevlar nonwoven interlayer. The laminated composites are evaluated in terms of morphologies, mechanical properties, combustion rates, and thermal behavior. Kevlar fibers are flame resistant and mechanically strong. LMPET fibers promote the interfacial bonding between layers. Thus, the laminated composites are good candidates as packaging materials, and they can be made with rigid or soft materials, depending on specified requirements. Rigid materials can provide higher strengths, and the distribution of fibers thus helps the PP-based laminated composites to obtain higher crystal stability. Moreover, using TPU with flexibility contributes to high extensibility, which grants the laminated composites with high toughness, light weight, and low restriction against the morphology. Such manufacturing is also efficient and economical, thereby satisfying the requirements of plastic packaging materials. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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- View/download PDF
4. Manufacturing techniques and property evaluations of sandwich-structured composite materials with electromagnetic shielding, flame retardance, and far-infrared emissivity.
- Author
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Lin, Ting An, Lin, Jia-Horng, Lin, Ting Ru, Lin, Jan-Yi, Lin, Mei-Chen, and Lou, Ching-Wen
- Subjects
ELECTROMAGNETIC shielding ,EMISSIVITY ,COMPOSITE materials ,HEAT treatment ,HOT pressing ,THERMAL conductivity ,HYGROTHERMOELASTICITY - Abstract
This study aims to produce sandwich-structured composite boards with flame retardance, far-infrared emissivity, and electromagnetic shielding effectiveness using nonwoven, weaving processes, and heat treatment. Needle punching and roller-type hot pressing are used to improve their tensile strength, tensile elongation, puncture strength, and burst strength. The limiting oxygen index is 30 regardless of whether the flame retardance/far-infrared emissivity/electromagnetic shielding effectiveness composite board is stainless steel (SS), SS+Ni–Cu (nickel-coated copper), or SS+Ni–Cu+Cu (copper) composite fabrics. SS+Ni–Cu and SS+Ni–Cu+Cu composite boards both have optimal thermal conductivity at the eighth test hour. SS–B composite board exhibit far-infrared emissivity of 0.81; moreover, they have optimal electromagnetic shielding effectiveness of −41dB at 2450 MHz when they are laminated into three layers at a 90° lamination. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
5. Processing techniques and properties of metal/polyester composite plain material: Electromagnetic shielding effectiveness and far-infrared emissivity.
- Author
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Lin, Jia-Horng, Lin, Ting An, Lin, Ting Ru, Jhang, Jia-Ci, and Lou, Ching-Wen
- Subjects
ELECTROMAGNETIC shielding ,COMPOSITE materials ,YARN ,EMISSIVITY ,WOVEN composites ,POLYESTERS ,POLYESTER fibers - Abstract
In this study, a composite plain material is composed of woven fabrics containing metal wire with shielding ability and polyester filament that can provide flexibility and far-infrared emissivity. Furthermore, a wrapping process is used to form metal/far-infrared–polyester wrapped yarns, which are then made into metal/far-infrared–polyester woven fabrics. The effects of using stainless steel wire, Cu (copper) wire, or Ni–Cu (nickel-coated copper) wire on the wrapped yarns and woven fabrics are examined in terms of tensile properties, electrical properties, and electromagnetic shielding effectiveness. Moreover, SS+Cu+Ni-Cu woven fabrics have maximum tensile strength, while SS+Ni-Cu woven fabrics have the maximum elongation and SS+Cu+Ni-Cu woven fabrics have the lowest surface resistivity. Stainless steel composite woven fabrics have far-infrared emissivity of 0.89 when they are composed of double layers. electromagnetic shielding effectiveness test results indicate that changing the number of lamination layers and lamination angle has a positive influence on electromagnetic shielding effectiveness of woven fabrics. In particular, SS+Cu+Ni-Cu woven fabrics exhibit electromagnetic shielding effectiveness of −50 dB at a frequency of 2000–3000 MHz when they are laminated with three layers at 90°. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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- View/download PDF
6. Mechanical and functional evaluations of flaming-retardant/far-infrared composite nonwoven fabrics.
- Author
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Lin, Jia-Horng, Lin, Ting An, Lin, Ting Ru, Lin, Jan-Yi, Lin, Mei-Chen, and Lou, Ching-Wen
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MECHANICAL behavior of materials ,FIREPROOFING agents ,NONWOVEN textiles ,COMPOSITE materials ,POLYETHYLENE terephthalate - Abstract
This study aims to investigate the mechanical properties, far-infrared (FIR) emissivity, and limiting oxygen index (LOI) of FIR ray/low-melting-point (LM) nonwoven fabrics, flame retardant (FR)/LM nonwoven fabrics, and FIR/FR/LM composite nonwoven fabrics, which are with or without heat treatment and also investigating the effect of heat treatment on the LM polyethylene terephthalate (PET) fibers. Test results show that for FIR/LM nonwoven fabrics, applying heat treatment leads to the better mechanical properties and FIR emissivity of 0.90. For FR/LM nonwoven fabrics, unheat-treatment samples have greater mechanical properties and an LOI of 34. For FIR/FR/LM composite nonwoven fabrics, the unheat-treated samples exhibit greater tensile properties, but the heat-treated samples exhibit greater puncture resistance, burst strength, and FIR emissivity. The structural parameters of the composite nonwoven fabrics can be adjusted according to the demand of users in terms of FIR emissivity and flame retardancy, and the composite nonwoven fabrics are thus expected to be used as construction materials for medical systems. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
7. Structural improvement of laminated thermoplastic polyurethane/low‐melting polyester/kevlar composites.
- Author
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Lin, Mei‐Chen, Lou, Ching‐Wen, Lin, Jan‐Yi, Lin, Ting An, and Lin, Jia‐Horng
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THERMOPLASTIC composites , *POLYURETHANES , *POLYESTER fibers , *TENSILE strength , *COMPOSITE materials - Abstract
Laminated composites are subject to delamination. This study aims to address this drawback and obtain structurally stable, lightweight, thin laminated composites through a novel manufacturing method that involves blending thermoplastic polyurethane (TPU), low‐melting polyester (LMPET), and Kevlar. Nonwoven LMPET/Kevlar fabrics are first processed through a nonwoven technique and then combined twice with TPU sheets through the sheet extrusion method. The mechanical properties, thermal behavior, and combustion resistance of the laminated TPU/LMPET/Kevlar composites are then evaluated. Results show that LMPET fibers strengthen adhesion between TPU and nonwoven laminates, and the addition of a small amount of TPU increases the peeling strength of the laminated TPU/LMPET/Kevlar composites by 1.9‐fold. The distribution of Kevlar fibers enhances the tensile properties and flame resistance of the laminated composites. Specifically, the tensile strength of the laminated TPU/LMPET/Kevlar composites reaches 18.85 MPa, and their combustion rate is significantly reduced. The proposed manufacturing design efficiently reduces delamination, thus extending the application range of laminated TPU/LMPET/Kevlar composites. POLYM. COMPOS., 40:E550–E558, 2019. © 2018 Society of Plastics Engineers [ABSTRACT FROM AUTHOR]
- Published
- 2019
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- View/download PDF
8. Investigation on structure and impact-resistance property of polyurethane foam filled three-dimensional fabric reinforced sandwich flexible composites.
- Author
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Huang, Shih-Yu, Lou, Ching-Wen, Yan, Ruosi, Lin, Qi, Li, Ting-Ting, Chen, Yueh-Sheng, and Lin, Jia-Horng
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POLYURETHANES , *LAMINATED materials , *VELOCITY , *COMPOSITE materials , *FLEXIBLE couplings - Abstract
This study investigates the static-bursting and low-velocity impact property of the sandwich flexible composites. The sandwich flexible composites were composed of a three-dimensional (3D) fabric filled flexible polyurethane (PU) foam core, and two compound laminates as face sheet. Foam filled fabric reinforced sandwich flexible structure were designed to explore the effect on the static-bursting and low-velocity impact properties of the sandwich flexible composites. The results represent that the static-bursting strength of the foam could increase to 324% by reinforced with the filling-resistant 3D fabric. The fiber blending ratio of the filling resistant 3D fabric had a prominent influence on the static-bursting strength. Finally, the sandwich flexible composites with the filling resistant 3D fabric have great elongation that is favorable to the low-velocity impact strength. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
9. Effects of needle punching and hot pressing on mechanical properties of composite geotextiles.
- Author
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Lin, Jia-Horng, Hsieh, Jing-Chzi, Huang, Chen-Hung, Hsing, Wen-Hao, Huang, Chien-Lin, Tan, Hsueh-Jen, and Lou, Ching-Wen
- Subjects
MECHANICAL behavior of materials ,HOT pressing ,GEOTEXTILES ,COMPOSITE materials ,RECYCLED products ,NONWOVEN textiles - Abstract
This study proposes to make geotextiles from recycled materials. Polyester fibers, recycled polyester fibers, and low melting point polyester fibers are blended and needle punched to make the polyester fabrics, the mechanical properties of which are then evaluated to determine the optimal parameters. The polyester nonwoven fabrics are needle punched with various densities. Afterwards, the resulting polyester nonwoven fabrics, glass fiber woven fabrics, and polypropylene selvages are combined, needle punched, and hot pressed to form geotextiles, the properties of which are tested by tensile strength, tearing strength, burst strength, puncture strength, and water resistance tests. The test results show that polyester fabrics containing 50 wt% of polyester fibers have the optimal mechanical properties. Furthermore, needle punching at 90 needles/cm
2 results in a greatest increase in mechanical properties of the polyester nonwoven fabrics. The tensile strength, tearing strength, and water resistance of the geotextiles increase as a result of hot pressing, and the bursting strength and puncture resistance are primarily associated with the needle punching densities. This study successfully creates composite geotextiles with reinforced mechanical properties by needle punching and hot pressing recycled polyester fabrics and polypropylene selvages. [ABSTRACT FROM AUTHOR]- Published
- 2017
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10. Puncture-resisting, sound-absorbing and thermal-insulating properties of polypropylene-selvages reinforced composite nonwovens.
- Author
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Lin, Jia-Horng, Li, Ting-Ting, and Lou, Ching-Wen
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ABSORPTION of sound ,THERMAL insulation ,POLYPROPYLENE ,NONWOVEN textiles ,POLYESTER fibers ,COMPOSITE materials - Abstract
In order to realize recycling of polypropylene selvages, polypropylene nonwoven selvages with different plied orientation were inserted between Kevlar/Nylon/low-melting polyester nonwoven fabrics forming composite nonwoven. Low-melting polyester content of nonwoven fabric and hot-pressing temperature of composite nonwoven were both optimized after static and dynamic puncture resistances. Moreover, effects of hot-pressing and plied orientation on static and dynamic puncture resistances, sound absorbing and thermal insulating properties of composite nonwoven were discussed respectively. Result shows that, optimal low-melting polyester fiber content was 30%, and best hot-pressing temperature for composite nonwoven was 180°C. Polypropylene nonwoven selvages improved static puncture resistance, sound absorbing and thermal insulating properties. Hot-pressing slightly increased puncture resistance and obviously improved thermal insulation, but decreased sound absorption coefficient significantly. Plied orientation affected static and dynamic puncture resistance insignificantly, but influenced on sound-absorbing and thermal-insulating properties significantly. When composite nonwoven was plied with 90°/90° polypropylene selvages and hot-pressed at 180°C, the static and dynamic puncture resistances reached 120 N and 80 N, respectively, and thermal conductivity was 0.047 W/mK. Five layers of composite nonwoven before hot-pressing had sound absorption coefficient of above 0.94 at frequency of higher than 1890 Hz. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
11. Preparation technique and antibacterial evaluation of high-absorbent composite fabrics.
- Author
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Lin, Jia-Horng, Chen, An-Pang, Li, Ting-Ting, Ho, Tsing-Fen, Lin, Mei-Chen, and Lou, Ching Wen
- Subjects
ANTIBACTERIAL agents ,COMPOSITE materials ,SURGICAL dressings ,SILVER nanoparticles ,CHITOSAN ,ESCHERICHIA coli - Abstract
Better-performance wound dressing has substitute for traditional wound healing materials in medical field. This study purposes to prepare high-absorbent composite fabric by compounding Tencel®/high-absorbent nonwoven fabrics and silver nanoparticles antibacterial agent. Nonwoven fabrics with different contents of high-absorbent fibers are discussed in terms of burst property and water absorption. Antibacterial agent is formed using 10 wt% chitosan and 100 mM silver nitrate solution after reaction for 6 h. Result showed that, 30 wt% high-absorbent fibers in nonwoven fabrics had 184 N burst strength and 38 times water absorption. Swelling dynamic result displayed that nonwoven fabric absorbed water within 5 min and water absorption presented saturation condition after 10 min. SEM observations showed that blood cells were attached on the surface of fiber and fibrin was formed around the blood cell after blood absorption evaluation of high-absorbent nonwoven fabrics. Antibacterial evaluations of composite fabrics revealed obvious inhibition zone to E. coli after incorporation of 9.7 mg/mL antibacterial agent. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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- View/download PDF
12. Impact properties of flexible composites made of nylon/high-resilience non-woven fabric with an inter/intra-ply hybrid structure.
- Author
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Lou, Ching-Wen, Huang, Shih-Yu, Huang, Chien-Lin, Yan, Ruosi, and Lin, Jia-Horng
- Subjects
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NYLON , *COMPOSITE materials , *NONWOVEN textiles , *IMPACT loads , *IMPACT testing , *URETHANE foam - Abstract
This study examines how inter/intra-ply hybrid structures influence the impact load of sandwich-structured flexible composites determined by static or low-velocity impact tests. The flexible composites are composed of nylon/high-resilient non-woven polyester fabrics as the surface sheet and polyurethane foam as the core layer. The polyurethane foam layer has a specified thickness and density, while the surface layers comprise various fiber blending ratios, different blending methods, different lamination procedures and lamination orders. The test results show that the flexible composites have an optimal impact absorption of 1901 N for a static impact when the nylon/high-resilient polyester non-woven fabrics are composed of an inter-ply hybrid structure. In contrast, they have an optimal impact absorption of 8255 N for a low-velocity impact when the nylon/high-resilience polyester non-woven fabrics are composed of an intra-ply hybrid structure. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
13. Structure design and property evaluation of silver/stainless steel composite fabric.
- Author
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Hwang, Po-Wen, Chen, An-Pang, Li, Ting-Ting, Lou, Ching Wen, and Lin, Jia-Horng
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SILVER ,STAINLESS steel ,POLYETHYLENE terephthalate ,COMPOSITE materials ,ELECTROSTATICS ,STRUCTURAL design - Abstract
This study presents a fabrication method for functional commingled yarns and prepared conductive knitted fabrics for shielding electromagnetic waves and electrostatic discharge. Stainless steel filament was used as core yarn, polyethylene terephthalate filament or silver yarn was used as wrapped yarn producing polyethylene terephthalate/polyethylene terephthalate/stainless steel filament or silver/silver/stainless steel filament commingled yarns via filaments hollow spindle spinning system and then knitting into silver/stainless steel composite fabric. The effects of cycle number and metal content on air permeability, surface resistance, and electromagnetic shielding properties of resultant knitted fabrics were discussed. Besides, influences of number of layers and lamination angle on electromagnetic shielding were also investigated intensively. The result shows that, conductive composite fabrics made by silver/silver/stainless steel filament commingled yarns and 450D polyethylene terephthalate plied filaments had higher surface resistance of 3.4 Log(Ω/sq) and 5.6 Log(Ω/sq), respectively, in coursewise and walewise directions. Electromagnetic shielding varied with number of layer, lamination angle, cycle number, and metal content. When six layers of conductive knitted fabrics were laminated with 45°, electromagnetic shielding reached 15 dB at 1–3 GHz frequency. The highest air permeability, 317.6 cm
3 /cm2 /s, occurred at single-layer conductive composite fabric. [ABSTRACT FROM AUTHOR]- Published
- 2016
- Full Text
- View/download PDF
14. Compressive properties of high-resilience thermal-bonding cushioning inter/intra-ply hybrid composites.
- Author
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Yan, Ruosi, Wang, Rui, Lou, Ching-Wen, and Lin, Jia-Horng
- Subjects
COMPOSITE materials ,THERMAL stability ,COMPRESSIVE strength ,REINFORCED concrete ,DELAMINATION of composite materials ,CUSHIONING materials - Abstract
In this study, hybrid composites composed of high-resilience fiber and reinforced with glass fabric were successfully prepared by needle punching and thermal bonding process. The effects of areal density, needle punching depth, and fiber blending ratio of the composites on delamination, cushioning, hardness, support factor, and hysteresis loss were investigated, and the relevant mechanisms were elucidated. Experimental results indicated that the hybrid composites exhibit high cushioning properties under multidrop-weight impact. The factors studied considerably influenced the cushioning properties of the composites. Hardness and support factor improved with increasing areal density and needle punching depth but decreased with increasing crimp hollow fiber ratio because of compression stress relaxation. Hybrid composites with various areal densities exhibited contrasting effects on the hysteresis behaviors of compression and indentation force deflections; these effects are attributed to the dissipation of support and energy in the materials surrounding the indentation. Instantaneous compression and recovery processes yielded no significant effects on fiber slippage; however, hysteresis loss was slightly affected by compression stress relaxation. The high-resilience thermal-bonding hybrid composites proposed in this work exhibited high cushioning and compression resistance properties. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
15. Manufacturing and mechanical characterization of perforated hybrid composites based on flexible polyurethane foam.
- Author
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Lou, Ching‐Wen, Huang, Shih‐Yu, Yan, Ruosi, and Lin, Jia‐Horng
- Subjects
COMPOSITE materials ,URETHANE foam ,MICROFABRICATION ,MECHANICAL properties of polymers ,FIREPROOFING agents - Abstract
ABSTRACT This study focused on the fabrication and mechanical evaluation of nonwoven reinforced flexible polyurethane foam composites. Effects of perforation ratio, aperture size, and perforation depth on bursting and low-velocity impact responses of perforated composite panels were investigated. The nonwoven fabric used for cover sheet was composed of flame retardant polyester, low-melting point polyester, and recycled Kevlar staple fibers. Blending ratio of Kevlar fiber was confirmed to have relation to mechanical mechanism of cushioning layer. The highest mechanical strength value was obtained at 5 wt % of Kevlar ratio because of the highest cohesive force among recycled Kevlar, flame retardant polyester, and low-melting point polyester fibers was provided at the blending ratio. The perforated high-density flexible polyurethane foam composites panel was adhered with intra-ply hybrid laminates with various areal densities on each face to form sandwich structural composites. The results revealed that perforation ratio and aperture significantly influenced the bursting and low-velocity impact resistance behaviors of the perforated composites panel. Perforated composites with 10% perforation ratio and 4 mm aperture lead to maximum bursting strength of 437 N. Additional hybrid laminates significantly promoted the maximum bursting strength of the semiperforated hybrid composites by 212%. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42288. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
16. Evaluation of high-modulus, puncture-resistance composite nonwoven fabrics by response surface methodology.
- Author
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Li, Ting-Ting, Wang, Rui, Lou, Ching Wen, and Lin, Jia-Horng
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COMPOSITE materials ,NONWOVEN textiles ,TEMPERATURE effect ,PARAMETER estimation ,HOT pressing ,PROTECTIVE clothing ,STRENGTH of materials ,INDUSTRIAL textiles - Abstract
Recycled high-modulus Kevlar fibers were blended with Nylon 6 staple fibers and biocomponent low-Tm/high-Tm polyester fibers to form high-modulus puncture-resistance nonwoven fabrics via opening, mixing, carding, lapping, needle-punching, as well as hot-pressing processes. In this paper, biocomponent low-Tm/high-Tm polyester fiber content, needle-punching density, and hot-pressing temperature were changed to evaluate the tensile strength, bursting strength and static puncture resistance of resulting nonwoven fabrics as related to aforementioned three parameters based on response surface methodology. The result shows that the tensile strength is highly related to needle-punching density and hot-pressing temperature; but the bursting strength and static puncture resistance are significantly involved with the aforementioned three parameters. The tensile strength, bursting strength, and static puncture resistance all present increasing and then decreasing trend with increase of its respective concerning parameters. Moreover, the static puncture resistance strength has linear dependence on bursting strength. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
- View/download PDF
17. Effect of Process Parameters on Puncture Resistance of Composites by Needle Punching and Thermal Bonding Techniques.
- Author
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Wang, Rui, Li, Ting-Ting, Lou, Ching-Wen, Lin, Jan-Yi, and Lin, Jia-Horng
- Subjects
GLASS fibers ,COMPOSITE materials ,PARAMETERS (Statistics) ,THERMAL analysis ,POLYESTERS ,CHEMICAL bonds ,PUNCHING (Metalwork) - Abstract
This article presents the effect of process parameters on both static and puncture resistance properties of composites that were made of glass fabric and nonwovens through needle-punching and thermal bonding techniques. The experiments were conducted under varying process parameters, namely, low-Tmpolyester content, needle-punched density, and nonwoven plied orientation and glass fabric angle. The significance of the process parameters is determined by analysis of variance (ANOVA). It is found that the needle-punched density and low-Tmpolyester fiber content impact on the static puncture resistance interactively and significantly. Also, both nonwoven plied orientation as well as glass angle have effect on the dynamic puncture resistance, but only the former significantly influences the static puncture resistance. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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- View/download PDF
18. Multifunctional, Polyurethane-Based Foam Composites Reinforced by a Fabric Structure: Preparation, Mechanical, Acoustic, and EMI Shielding Properties.
- Author
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Wang, Hongyang, Li, Ting-Ting, Wu, Liwei, Lou, Ching-Wen, and Lin, Jia-Horng
- Subjects
COMPOSITE materials ,ELECTROMAGNETIC shielding ,ELECTROMAGNETIC interference ,MATERIALS compression testing ,STRENGTH of materials ,MECHANICAL behavior of materials ,ABSORPTION of sound - Abstract
This study proposes multifunctional, fabric-reinforced composites (MFRCs) based on a bionic design, which are prepared by two-step foaming and a combination of different fabric constructs. MFRCs are evaluated in terms of sound absorption, compression resistance, electromagnetic interference shielding effectiveness (EMI SE), and drop impact, thereby examining the effects of fabric structures. The test results indicate that the enhanced composites have superiority functions when combined with carbon fabric in the upper layer and spacer fabric in the lower layer. They have maximum compression resistance, which is 116.9 kPa at a strain of 60%, and their compression strength is increased by 135.9% compared with the control specimen. As a result of the fabric structure on the cell morphology, the maximum resonance peak shifts toward high frequency when using spacer fabric as the intermediate layer. The average sound absorption coefficient is above 0.7 at 1000–4000 Hz. The reinforced composites possessed EMI SE of 50 dB at 2 GHz; an attenuation rate of 99.999% was obtained, suggesting a good practical application value. Furthermore, the cushioning effect of the MFRCs improved significantly, and the maximum dynamic contact force during the impact process was reduced by 57.28% compared with composites without any fabric structure. The resulting MFRCs are expected to be used as sound absorbent security walls, machinery equipment, and packaging for commercial EMI shielding applications in the future. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
19. Using 3D Composite Electrode Materials for Electricity Generation from Swine Wastewater in a Dual-Chamber Microbial Fuel Cells.
- Author
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Lai, Mei ‐ Feng, Lou, Ching ‐ Wen, and Lin, Jia ‐ Horng
- Subjects
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COMPOSITE materials , *ELECTRODES , *MICROBIAL fuel cells , *INDUSTRIAL wastes , *ORGANIC compounds - Abstract
Swine wastewater has a high concentration of organic matter, suspended solids, and higher ammonia nitrogen, odor, complex polluting ingredients, and large emissions. A two-chambered cubic microbial fuel cell ( MFC) was used to evaluate the effect of a novel three-dimensional ( 3D) electrode made of 3D iron composites and 3D stainless composites on the electricity generation. Swine wastewater with a total chemical oxygen demand ( TCOD) of 3688 ± 300 mg/L was used as the feedstock in the anode chamber. The MFC reactor was incubated with an initial pH of 7.0 in an air shaker with a temperature of ~35°C and 100 rpm in the fed-batch mode. A fixed external resistance ( R) of 100 Ω was connected between the electrodes, and the closed-circuit potentials of the MFCs were recorded every 5 min. The results showed that using an iron-carbon fiber composite 3D electrode resulted in a peak electricity generation of 321 mV on the first 2 days and maintained a stable voltage of 163 mV during the second to sixth days. The COD removal efficiency could reach 75%. Using a stainless-carbon fiber 3D electrode could generate a peak voltage of only 29.5 mV and a stable voltage of 15.2 mV with a COD removal efficiency of 54%. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
20. Low-velocity impact and static behaviors of high-resilience thermal-bonding inter/intra-ply hybrid composites.
- Author
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Yan, Ruosi, Wang, Rui, Lou, Ching-Wen, and Lin, Jia-Horng
- Subjects
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COMPOSITE materials , *CHEMICAL sample preparation , *CUSHIONING materials , *THERMAL analysis , *SLIDING friction - Abstract
This study prepared inter/intra-ply hybrid composites reinforced with sandwich-structure recycled Kevlar nonwoven/glass woven compound fabric. Negative-depth needle punching and thermal bonding were applied to strengthen the structure with two compound cover plies and a fluffy cushioning center ply. The effects of center ply areal density, needle punching depth, and fiber blending ratio on the static and dynamic impact resistance behaviors of the composites were investigated. The results indicated that areal density significantly influenced the static and dynamic impact behaviors, which were both enhanced by the promotion of thermal-bonding points. As the needle punching deepened, the static and dynamic puncture resistances represented opposite tendencies because of different failure mechanisms. Static friction was the dominant factor for static puncture resistance, whereas kinetic friction was the dominant factor for dynamic puncture resistance. A similar phenomenon was observed when fiber blending ratio was varied. In terms of the non-penetrating dynamic cushioning test, areal density was the most distinct influence factor on cushioning behavior and the hybrid composites sample with an areal density of 700 g/m 2 could eliminate up to 66.5% of the incident force. Therefore, the inter/intra-ply hybrid composites showed high impact resistance and excellent dynamic cushioning property. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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- View/download PDF
21. Preparation of flexible, highly conductive polymer composite films based on double percolation structures and synergistic dispersion effect.
- Author
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Li, Ting‐Ting, Wang, Yuxiao, Wang, Yanting, Sun, Fei, Xu, Jiawen, Lou, Ching‐Wen, and Lin, Jia‐Horng
- Subjects
- *
CONDUCTING polymer films , *CONDUCTING polymer composites , *COMPOSITE materials , *PERCOLATION , *CARBON nanotubes , *DOUBLE walled carbon nanotubes , *DISPERSION (Chemistry) - Abstract
We studied for the first time the synergistic dispersion effect of the carbon nanotube (CNT)/graphene (Gr) and polypropylene (PP)/polycarbonate (PC) (1:1) double percolation structures on conductive polymer composites (CPCs). PP/PC/CNT/Gr films with different CNT/Gr ratios are prepared by melt blending and hot pressing. Results showed that a CNT/Gr ratio of 1:1 facilitated the creation of co‐continuous double percolation structures of matrices, and the electronic conductivity reached 33.11 S/m, which was five times greater than that of the matrices containing only CNT. Results showed that the synergistic dispersion effect and the co‐continuous double percolation structures provided the matrices with conductivity through an additive effect. Meanwhile, PP/PC/CNT/Gr composite films possessed good thermal stability and hydrophobicity. They also did not exhibit thermal degradation at 300°C and had a water contact angle of 94.5°. However, PP and PC were incompatible, causing considerable brittleness of composite films macroscopically, and the films can hardly curve. To respond to this downside and improve the flexibility, a small amount of thermoplastic polyurethane (TPU) was added to the system. The presence of TPU helped combining the two materials in different phases, thereby strengthening the continuity. However, the presence of TPU adversely affected the double percolation structures and dispersion state of fillers, and subsequently decreased the conductivity. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF
22. Tensile, electromagnetic, and far‐infrared properties of stainless steel/far‐infrared polyester composite materials.
- Author
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Lin, Ting An, Shiu, Bing‐Chiuan, Lin, Jia‐Horng, and Lou, Ching‐Wen
- Subjects
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STAINLESS steel , *COMPOSITE materials , *LAMINATED materials , *ELECTROMAGNETIC shielding , *POLYESTERS - Abstract
In this study, a continuous‐forming wrapping process simultaneously feeds far‐infrared ray polyester (FIR‐PET) filaments and stainless steel (SS) wire to prepare functional SS/FIR‐PET composite wrapped yarns. The wrapped yarns are made into functional SS/FIR‐PET composite woven fabrics. The cover factor, tensile properties, electromagnetic shielding effectiveness (EMSE), FIR emissivity, and air permeability of the wrapped yarns and woven fabrics are evaluated, examining the influences of the combinations of diameter of SS wires (0.05 and 0.08 mm are referred as 005SS and 008SS) and wrapped count (7, 10, and 13, turns/cm). For SS/FIR‐PET composite wrapped yarns, 005SS‐7 (0.05‐mm SS with wrapped counts 7 turns/ cm) and 008SS‐7 (SS/ FIR‐PET composite wrapped yarns with 0.08‐mm SS and wrapped counts 7 turns/ cm) have the optimal tensile strength and tenacity, while 008SS‐13 has the optimal elongation and work of rupture. For SS/ FIR‐PET composite woven fabrics, 008SS‐W (W regarded as woven fabric) has the optimal tensile properties; 008SS‐W‐10 has the maximum stress at break of 27.01 MPa along the weft direction; and 008SS‐W‐13 has the maximum elongation at break of 29.83% along the weft direction. The EMSE test results confirm that changing the number of lamination layers and changing the lamination angles have a positive influence on the EMSE of the woven fabrics. The EMSE of 008SS‐W reaches −40 dB when the number of lamination layers is 3 and the lamination angle is 90°. Moreover, the EMSE of 008SS‐W reaches 0.85 when the number of lamination layers is 3. It is expected to apply functional SS/FIR‐PET woven fabric in practical domains, which that can be regarded as the middle layer of laminated composite fabric or health‐care textile. The functional SS/FIR‐PET woven fabric can give traditional laminated composite fabric with the electromagnetic‐shielding ability and FIR emissivity, and thus highly enhance the additional value of traditional composite fabrics. POLYM. COMPOS., 40:2219–2230, 2019. © 2018 Society of Plastics Engineers [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
23. Weaving carbon fiber/recycled polypropylene selvages to reinforce the polymer‐based protective composite fabrics: Manufacturing techniques and electromagnetic shielding effectiveness.
- Author
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Lin, Ting An, Chuang, Yu‐Chun, Lin, Jan‐Yi, Lin, Mei‐Chen, Lou, Ching‐Wen, and Lin, Jia‐Horng
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CARBON fiber-reinforced plastics , *POLYPROPYLENE , *COMPOSITE materials , *MANUFACTURING processes , *ELECTROMAGNETIC shielding , *FABRICATION (Manufacturing) - Abstract
This study aims to investigate the effect of carbon fibers (CFs), recycled polypropylene (PP) selvages, and glass fibers (GFs) on the electromagnetic shielding effectiveness and mechanical properties of composite polyester (PET)‐wrapped yarns and composite PET woven fabrics. The PET/PP‐, PET/PP/CF‐, and PET/PP/GF‐wrapped yarns are manufactured via a rotor twister with various rotary rate. A looming machine is used to fabricate the mentioned wrapped yarns into woven fabrics, and thus the electromagnetic shielding effectiveness and mechanical properties are examined. The results show that various rotary rates influence the diameter and wrapped angle of the wrapped yarns, as well as their tensile strength and elongation. Woven fabrics that are composed of the wrapped yarns with a small diameter have a dense fabric structure, which in turn results in a decrease in air permeability and an increase in tensile strength. The woven fabrics are composed of PET yarns and CFs, in an attempt to be used in industrial or everyday protective clothes that secure the safety and standard of living. POLYM. COMPOS., 40:E1910–E1917, 2019. © 2018 Society of Plastics Engineers [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
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