Single Fibre Swelling Behavior for Natural and Man-Made Cellulose Fibres Under Industrial Steeping Conditions

Swelling behavior of cotton, dissolving wood pulp (DWP), viscose staple fibre (VsF), and Tencel staple fibre (TsF) in varying sodium hydroxide (NaOH) were investigated by means of optical microscopy and were characterized by molecular mass distribution, X-ray diffractometer, and dynamic vapor sorption. Effect of temperature (20-45 °C) and duration (0-120 min) was studied. The results reveal that the swelling ratio of fibre in alkali solution depends on fibre accessibility and NaOH concentration. Among all the materials, VsF exhibited the highest swelling ratio and lowest swelling ratio has been observed for cotton fibre. The results suggest that the swelling is limited by the presence of plant cell wall structures in cotton and DWP, rather from fringed-fibrillar, semi-crystalline sub-structures, which result from the inherent tendency of cellulose molecules to form such structures during the biosynthesis of plant cell walls as well as during the formation of regenerated cellulosic textile fibre in wet-spinning.

Novel Low-Twist Bast Fibre Yarns from Flax Tow for High-Performance Composite Applications

The use of natural fibres for components subjected to higher mechanical requirements tends to be limited by the high price of high-quality semi-finished products. Therefore, the present study deals with the development of more cost-effective staple fibre yarns made from flax tow. In the subsequent processing stage, the yarns were processed into quasi-unidirectional (UD) fabrics. The results of the fibre characterisation along the process chain have shown that no significant mechanical fibre damage occurs after slivers’ production. Fibres prepared from yarns and fabrics show comparable characteristics. The yarns were processed to composites by pultrusion to verify the reinforcement effect. The mechanical properties were comparable to those of composites made from a high-quality UD flax roving. The fabrics were industrially processed into composite laminates using a vacuum infusion and an autoclave injection process (vacuum injection method in an autoclave). While impact strength compared to a reference laminate based on the UD flax roving was achieved, tensile and flexural properties were not reached. An analysis showed that the staple fibre yarns in the fabric show an undulation, leading to a reorientation of the fibres and lower characteristic values, which show 86–92% of the laminate made from the flax roving. Hybrid laminates with outer glass and inner flax layers were manufactured for the intended development of a leaf spring for the bogie of a narrow-gauge railroad as a demonstrator. The hybrid composites display excellent mechanical properties and showed clear advantages over a pure glass fibre-reinforced composite in lightweight construction potential, particularly flexural stiffness.

Development of a process chain for the production of high-performance 100% metal spun yarns based on planed metal staple fibres

The high potential of metal fibres for various technical applications including filtration, electrical, heat and cut resistance or composite applications is still not fully exploited due to their high production costs. This paper presents the development of a new process chain for spinning 100% metal spun yarns from planed metal staple fibres as an alternative to conventional metal fibres. The developed spinning process chain begins with a stretch breaking process to create metal staple fibre sliver with a narrow fibre length distribution and defined mean fibre length. Next, a drafting process on a draw frame is performed in order to produce highly uniform metal staple fibre sliver. This is the basis for the development of a flyer spinning process to realise high-performance metal spun yarn. Finally, the fundamental relationships between fibre properties, processing characteristics, semi-finished product properties and the performance of the resulting metal spun yarns are described in detail.

Dref-3 yarn structure with plied staple fibrous core

Purpose Dref-3 friction spun core yarns produced using staple fibre yarn as the core, e.g. Jute core yarn wrapped with cotton fibre, have poorer mechanical properties compared to the core yarn itself. The purpose of this study was to understand the structure of such yarns, that will lead to the optimization of fibre, machine and process variables for production of better quality yarn from the Dref-3/3000 machines. Design/methodology/approach The Dref spinning trials were conducted following a full factorial design with six variables, all with two operative levels. The Dref-3 friction spun yarn, in which the core is a plied, twisted ring yarn composed of cotton singles and the sheath, formed from the same cotton fibres making the singles, has been examined. The structures have also been studied by using the tracer fibre technique. Findings It was observed that rather than depending on the plied core yarn, the tensile properties of the Dref-3 yarn are significantly determined by the parameters those affect the constituent single yarn tensile properties, i.e. the amount of twist and its twist direction, yarn linear density and the sheath fibre proportion used during the Dref spinning in making the final yarn. Further, when the twist direction of single yarn, double yarn and the Dref spinning false twisting are in the same direction, the produced core-sheath yarn exhibits better tensile properties. Practical implications The understanding of the yarn structure will lead to optimized production of all staple fibre core Dref spun yarns. Social implications The research work may lead to utilization of coarse and harsh untapped natural fibres to the production of value-added textile products. Originality/value Though an earlier research has reported the effects of sheath fibre fineness and length on the tensile and bending properties of Dref-3 friction yarn, the present study is the first documented attempt using the tracer fibre technique to understand Dref-3 yarn structure with plied staple fibrous core.

PRODUK EKSPOR PROSPEKTIF INDONESIA KE PERU DAN FAKTOR-FAKTOR PENENTU ALIRAN PERDAGANGANNYA KE KAWASAN AMERIKA SELATAN

Peru in South America area has potential market for Indonesia’s products and has been established as prospective market. This study is aimed to analyze the performance of bilateral trading between Indonesia and Peru, to analyze the export products prospective for Indonesia-Peru bilateral trading and also the factors affecting its trade flow to South America. The analysis methods used in this research were Revealed Comparative Advantage (RCA), Export Product Dynamic (EPD), Intra Industry Trade (IIT) and gravity model. Gravity model used panel data with modification sample cross section data of South America countries (Peru, Argentina, Brazil, Chili, Ecuador, Colombia, Paraguay, Suriname, Uruguay and Venezuela) from 2000-2013 time series. The result showed that trade balance as indicator of performance in bilateral trading Indonesia-Peru have been increasing. Indonesia’s export product prospective to Peru are HS 4001 (Natural rubber, balata, gutta-percha etc), HS 0801 (Brazil nuts, cashew nuts & coconuts), HS 5509 (Yarn of synth staple fibre, not put for retail sale), and HS 4420 (Wood marquetry & inlaid wood; caskets & cases or cutlery of wood). Only HS 5509 (Yarn of synth staple fibre,not put for retail sale) and HS 0801 (Brazil nuts, cashew nuts & coconuts) have weak integration. The gravity model with Fixed Effect Model showed that different GDP per capita and trade/GDP have significant positive effect on value export of product prospective. Tariff have significant negative effect for HS 0801 (Brazil nuts, cashew nuts & coconuts), HS 5509 (Yarn of synth staple fibre,not put for retail sale) dan HS 4420 (Wood marquetry & inlaid wood; caskets & cases or cutlery of wood). Economic distances have significant negative effect exclude HS 4001 (Natural rubber, balata, gutta-percha etc). Real exchange rate have significant possitive only for HS 5509 (Yarn of synth staple fibre,not put for retail sale), while the others product have not significant effect. Keywords : Indonesia-Peru-South America Trading, RCA, EPD, IIT, Gravity model

PRODUK EKSPOR PROSPEKTIF INDONESIA KE PERU DAN FAKTOR-FAKTOR PENENTU ALIRAN PERDAGANGANNYA KE KAWASAN AMERIKA SELATAN

Peru in South America area has potential market for Indonesia’s products and has been established as prospective market. This study is aimed to analyze the performance of bilateral trading between Indonesia and Peru, to analyze the export products prospective for Indonesia-Peru bilateral trading and also the factors affecting its trade flow to South America. The analysis methods used in this research were Revealed Comparative Advantage (RCA), Export Product Dynamic (EPD), Intra Industry Trade (IIT) and gravity model. Gravity model used panel data with modification sample cross section data of South America countries (Peru, Argentina, Brazil, Chili, Ecuador, Colombia, Paraguay, Suriname, Uruguay and Venezuela) from 2000-2013 time series. The result showed that trade balance as indicator of performance in bilateral trading Indonesia-Peru have been increasing. Indonesia’s export product prospective to Peru are HS 4001 (Natural rubber, balata, gutta-percha etc), HS 0801 (Brazil nuts, cashew nuts & coconuts), HS 5509 (Yarn of synth staple fibre, not put for retail sale), and HS 4420 (Wood marquetry & inlaid wood; caskets & cases or cutlery of wood). Only HS 5509 (Yarn of synth staple fibre,not put for retail sale) and HS 0801 (Brazil nuts, cashew nuts & coconuts) have weak integration. The gravity model with Fixed Effect Model showed that different GDP per capita and trade/GDP have significant positive effect on value export of product prospective. Tariff have significant negative effect for HS 0801 (Brazil nuts, cashew nuts & coconuts), HS 5509 (Yarn of synth staple fibre,not put for retail sale) dan HS 4420 (Wood marquetry & inlaid wood; caskets & cases or cutlery of wood). Economic distances have significant negative effect exclude HS 4001 (Natural rubber, balata, gutta-percha etc). Real exchange rate have significant possitive only for HS 5509 (Yarn of synth staple fibre,not put for retail sale), while the others product have not significant effect. Keywords : Indonesia-Peru-South America Trading, RCA, EPD, IIT, Gravity model

Kebijakan Anti Dumping dan Trade Deflection: Studi Kasus Synthetic Staple Fibre Polyester (PSF)

This research empirically examines whether a country's anti dumping policy can distort export of another country to third markets. This research tries to explore about trade deflection of Indonesia's export on Synthetic Staple Fibre Polyester (PSF) HS 550320 to non-European Union as the result of European Union's (EU) anti dumping policy on Indonesia. This research uses panel data model (fixed effects) and 20 countries (non-European Union) of Indonesia's PSF export during ten years (1996-2005). We find evidence that trade deflection for Indonesia's export on Synthetic Staple Fibre Polyester (PSF) HS 550320 occurred. Because of European Union had imposed anti dumping duty on Indonesia, Indonesia's export to nonEuropean Union had increased ranged from 25 percent to 44 percent. This result shows that dumping duty from European Union does not fully carry out negative effect for Indonesia, furthermore thisphenomena can be used as ”early warning” for Indonesia both for case of Indonesia as exporting country or third countries.