Papers by Keyword: Nylon

Abstract: To dehydrate technical suspensions, diverse in composition, the filter baffle plates made from synthetic fibres (nylon, polyethylene terephthalate (lavsan), tetrafluorethylene (tephlon), ftorlon) are used. High retention capacity of the filter baffle plates on the dispersion phase of the suspension is one of the major requirements. The article represents the assessment of the filter properties the double-layer baffle plates have: cotton, consisted of filter diagonal art. 2074 (substrate) and coarse calico (base), and synthetic nylon, consisted of the fabric art. 56027 (substrate) and the fabric 56159 (base). The kinetics of the filtration process of the different in composition dispersion suspension particles of the red mud has been studied. The formation conditions of the initial filter layer have been described.

Abstract: An experimental study was carried out to investigate the behaviour of short column confined by waste plastic bags and nylon strips and findings of this study are presented in this paper. Eight reinforced concrete (RC) short columns were casted. Among them two specimens were named as control, while remaining six specimens were divided into three groups [two specimens for each group] based on different confinement techniques investigated in this study. In retrofitting technique 1 (RT-1), RC short columns were externally confined by full wrap of plastic bags, while in retrofitting techniques 2 (RT-2) and 3 (RT-3), confinement was provided to the short columns by stirrups of nylon and plastic bags with 25 mm clear spacing, respectively. The testing under compression loading was performed on UTM of 100T capacity. From the results obtained, seismic parameters such as ductility, fracture energy before peak and after peak, factor k* and load-displacement response were studied. The results indicated that RC short column confined by RT-1 (full wrap) gives better performance in terms of ductility and fracture energy after peak. Increase in the ductility of RT-1 specimen was about 25% as compared to the control one. Moreover, post-peak fracture energy exhibited by short column confined through techniques RT-1 and RT-2 was 132 and 125 N/mm as compared to control one with 14 N/mm of fracture energy. The experimental observations further indicated that the failure of control specimen was sudden showing high brittleness while the failure of confined specimens by RT-1 and RT-2 techniques was observed to be gradual giving some warning before final failure.

Abstract: In this article a sandwich beam structure with honeycomb core filled of MRE (magnetorheological elastomer) with different ratios of Elastomer and iron particles is proposed. Modal response for structures with Nylon and Resin8000 honeycomb core filled with MRE and sandwiched between aluminum face sheets were analyzed and compared for two different ratios of MRE by placing magnets at free end and center of the structure. The force generated by magnets on the sandwich beam structure was calculated using ANSYS EDT and the modal response of the structure was then observed under generated magnetic force using ANSYS Workbench. The results showed that the resonance frequency of the structure decreased as the magnetic intensity was increased for all the cases specially for the first mode. Secondly structure with Nylon honeycomb core showed lower frequency drop and higher deformation than the structure with Resin8000 honeycomb core.

Abstract: In this article presents evidence about performance of mechanical properties of polycarbonate and nylon materials, which are used in the additive manufacturing by deposition of molten material and that have been subjected to sterilization processes by moist heat at 121°C and dry heat at 140°C. This study provides useful information to consider the use of these materials in sanitary and sterile settings. Mechanical tests of tensile, flex, hardness, Izod impact, thermal tests in Differential Scanning Calorimetry DSC, Thermomechanical analysis TMA and Scanning Electron Microscopy SEM were performed. It is concluded that the mechanical and thermal properties have not been altered through the effect of temperature in sterilization processes.

Abstract: Increasing waste streams of carbon fibers (CF) and carbon fiber reinforced plastics (CFRP) lead to increasing need for recycling and to growing amounts of recycled carbon fibers. A main issue in current research for carbon fiber recycling is the reuse of regained fibers. Carbon staple fibers such as recycled fibers hold big potential for mechanical properties of lightweight parts, if used properly. Applying recycled CF (rCF) as milled reinforcement fibers or as nonwoven in carbon fiber reinforced plastic leads to a poor yield of mechanical proper due to low fiber orientation, limitations in fiber volume content or due to short fiber length. The rC staple fiber tape presents a more efficient approach. Recycled carbon fibers are blended with 50 wt. % thermoplastic nylon 6 fibers and processed through a roller card to a sliver, which is a linear fibrous intermediate. The sliver is continuously drawn, formed, heated and consolidated to the thermoplastic rC staple fiber tape. The tape is similar to common carbon fiber tapes or to continuous tows but has different positive properties, such as high fiber orientation, homogeneous blend of fiber and matrix and suitability for deep drawing.

Abstract: This work presents a computer-aided design and engineering CAD/CAE for design and optimization of M16 handguard manufacturing. A new design of handguard was developed in term of various combinations of supporting ribs inside the component. Finite Element Analysis (FEA) was used to simulate the stress distribution as well as the evaluation of supporting ribs in the component. The injection molding was used for production of the hand guard; therefore, the CAE was used to simulate the effect of gate location and gate type on the weld lines. The excessive-flash technique, which extends the fill time and continues the melt lines to flow after the melt recombination, has been introduced in order to reduce the weld lines. The simulation results indicated that the stress concentration in the loading and vent holes regions had the potential to cause the handguard to fracture. However, the combinations of vertical and horizontal ribs can reduce the stress concentration in the component. The weld lines located near the vent hole, in which the melt fronts came in contact with each other. The type and location of gates did not affect the weld line while the weld lines were observed to be strongly influenced by the excessive flash.

Abstract: A natural colorant obtained from extraction of mangrove bark was applied on nylon fabrics via exhaustion process. Colorimetric data (CIE L*, a*, b* and K/S) were evaluated. Pre-, meta-and post-mordanting with different metal mordants (aluminium potassium sulfate, ferrous sulfate, copper sulfate, and stannous chloride) were also investigated. The colorant extracted from mangrove bark shows affinity to nylon fabric dyed without mordants. The highest color yield and uniform dyeing were obtained with post-modanting method.

Abstract: The present paper deals with the application of natural dyes extracted from cassia fistula fruit or golden shower tree seed pods on nylon fabric. The dyeing properties were evaluated by measuring K/S and CIELAB values. In addition, the different fastness properties were evaluated. The effect of metal mordants at different concentration levels with respect to their colour strength was also studied. Nylon fabrics dyed with golden shower tree seed pods extract without mordant showed a light brownish-yellow shade, while those dyed with ferrous sulfate and stannous chloride brighter brownish-yellow colour. Nylon substate dyed with alum and CuSO₄ gave a duller brownish-yellow colour. The fastness properties ranged from fair to good level.

Abstract: Carbon fiber reinforced composites (CFRCs) have been used in various high-end industries due to their outstanding specific mechanical properties. Recently, carbon nanotube (CNT)-grafted carbon fibers (CFs) made via direct growth has emerged as an advanced and hierarchical reinforcement that can improve the reinforcing effect of CFs in CFRCs. On the other hand, CF reinforced thermoplastic composites (CFRTPs) have attracted much attention because of their quick and mass production capability, e.g., which is important for automotive part manufacturing. Here, we report on the manufacture of CFRTPs using CNT-grafted CFs and their mechanical properties. First, the interfacial shear strength of CNT-grafted CFs with thermoplastic resins was characterized to demonstrate improved interfacial properties due to the CNTs grafted on CFs. Then, the composites were manufactured in two ways; polymer nanoparticles and in-situ polymerization. Polymer nanoparticles were used to improve the interfacial properties due to their small size and good mechanical locking with CF surfaces. In-situ polymerization was also used to manufacture CFRTPs, i.e., monomers with catalyst were transferred into CNT-grafted CF fabric preform using vacuum assisted resin transfer molding and then polymerized into solid matrix. This in-situ polymerization enabled the manufacture of CNT-grafted CF thermoplastic composites by overcoming the difficulties of filling the surface of CNT-grafted CFs with thermoplastic polymers. Finally, the mechanical, thermal, electrical, and damping properties of CNT-grafted CF thermoplastic composites were characterized and compared with their thermoset composites.

Abstract: With increase of life quality, demand for surrounding environment becomes more and more severely. Noise pollution in daily life lowers comfortablility and quiet of life. It is reduced accordingly if effective utilization of sound absorbing materials. This study uses polyester (PET) fibers and Nylon fibers bended with PP fibers respectively to form PET/PP and Nylon/PP nonwoven fabrics and then thermally bonded preparing PET/PP and Nylon/PP composites. The optimal parameters are evaluated by mechanical strength, and sound absorption tests. This study expects to prepare sound-absorbing composites in application of automotive interior and indoor building wall. Nylon/PP composites prepared in this study have the optimum sound absorption coefficient of 0.4 at high frequency, when containing 10 wt% proportions of PP fibers.