The Influence of Elimination of Roving Frame on Ring Spun Cotton Yarn Characteristics

Generally, ring spun yarns are manufactured from roving which is produced by roving frame. In this paper, an experiment has been done producing ring spun cotton yarn directly from finisher drawn sliver eliminating the roving frame. Total 3 types of yarn with the various linear density of 8 Ne, 10 Ne & 12 Ne were produced using a roving frame and without using a roving frame. In the next step, physical and mechanical properties of those yarns including unevenness, imperfections, hairiness & tenacity were investigated. The result showed that ring spun cotton yarns produced from sliver exhibited inferior physical and mechanical properties compared with samples from the conventional ring spinning system.

CALCULATION AND MEASUREMENT OF DYNAMIC EXPANSION OF ROVING FLYER

Roving flyer is an important part of roving frame. Its dynamic expansions affect the quality of rove greatly. The expansions are calculated by means of the general program SAP84 based on finite element method in this paper. Its measuring principle and usage are also described. The results of calculating and measuring are identical. The method presented in the paper is effective for studying the properties of roving flyer.

Research on Intelligent Control of Roving Frame

A new model of roving frame FA467, which uses four frequency inverters to replace the complex mechanical transmission, is discussed. A Neuron-PID is designed to reduce the effect of various parametric variations such as load inertia. To ensure the constant spinning tension all over the spinning process, a feedforward controller using iterative learning control algorithm is desigend to avoid disturbances caused by changes of temperature, humidity and so on. The simulation result is shown to illustrate the effectiveness of the proposed algorithm, and now the roving frame FA467 has been developed successfully.

Study of a New Drafting System of Rubbed Roving Frame

This paper puts forward a new drafting system of the rubbed roving frame, which consists of a nine-link gear, two slipping gears. It has brought forward a new design method of the nine-link gear and the slipping gears, and set up approximate formulas for modification coefficients of gears for the first time. And the principles of transmitting rate designing for the system are given. The calculating results demonstrate that the new design method satisfies the demands of processing technology. This mechanism has been used successfully in the kind of rubbed roving frame.

A New Thread Guide Mechanism of Rubbed Roving Frame

A new thread guide mechanism of a rubbed roving frame is developed, which consists mainly of a plate cam, a linkage and an air bag spring. Characteristics and design parameters of the air spring are explored in this study. Based on analyses of winding technology for this kind of package, the kinetic laws of the thread guide is put forward. General design equations of the cam profile are derived, and common kinetic laws of II linkage group which is used for such mechanism design is proposed. It proves theoretically that it is practicable. The experimental results indicate that it can meet the needs of technological demands, and the new thread guide mechanism has been used successfully on textile machines.

Influence of the Woven Structure on the Initial Fracture Behavior of Roving Glass Fabric Reinforced Composites

In this paper, investigation on the initial fracture behavior was carried out on roving glass woven fabric reinforced composites which were manufactured by hand lay-up method. Two kinds of roving glass woven fabrics of different FAW (Fabric Area Weight) and crimp ratio, Type A of 570 g/m2 and Type B of 800 g/m2, were adopted as reinforcement in this study. Tensile test was conducted and tensile properties were discussed on specimens of 6 degrees 0°/5°/10°/80°/85°/90°. The initial fracture behavior was observed on 0 degree and 90 degree and the fracture mechanism was compared and discussed among 5°/10°/80°/85°. The results showed that Type B has higher tensile modulus and tensile strength than that of Type A. And different initial fracture behaviors between two kinds of materials was observed and analyzed, which indicated that the crimp ratio plays an important role of woven fabric reinforced composites in fracture mechanism.

Our Roving Reporters

Photographer Shen Yantai (M. standing, now deputy editor-inchief), records the 70th anniversary of the March 8th International Working Women’s Day with his camera in 1980. Mme. Soong Ching Ling, late vice chairperson of the National People’s Congress, attended the meeting. (right, sitting)

Influence of Fabric Parameters on Microstructure,Mechanical Properties and Failure Mechanisms in Carbon-Fibre Reinforced Composites

The effects of fibre/matrix bonding, fabric density, fibre volume fraction and bundle size on microstructure, mechanical properties and failure mechanisms in carbon fibre reinforced composites （plastic and carbon matrix） have been investigated. The microstructure of unloaded and cracked samples was studied by optical microscopy and scanning electron microscopy （SEM）, respectively whereas the mechanical behaviour was examined by 3- point bending experiments. Exclusively one type of experimental resole type phenolic resin was applied. A strong fibre/matrix bonding, which is needed for high strength of carbon fibre reinforced plastic （CFRP） materials leads to severe composite damages during the pyrolysis resulting in low strength, brittle failure and a very low utilisation of the fibres strain to failure in C/C composites. Inherent fabric parameters such as an increasing fabric density or bundle size or a reduced fibre volume fraction introduce inhomogenities to the CFRP＇s microstructure. Results are lower strength and stiffness whereas the strain to failure increases or remains unchanged. Toughness is almost not affected. In C/C composites inhomogenities due to a reduced bundle size reduce strain to failure, strength, stiffness and toughness. Vice versa a declining fibre volume fraction leads to exactly the opposite behaviour. Increasing the fabric density （weight per unit area） causes similar effects as in CFRPs.

Comparative Case Study on Adhesion of Three Common Sizing Agents to Cotton and Polyester Yarns

The adhesion between warp sizing and fiber was systematically studied by using the roving method.Cotton roving and polyester roving were sized with various concentrations between 0.01%and 2.50%of acid-thinned starch,polyvinyl alcohol and water-soluble polyester sizing,respectively,and tensile property of the sized roving was tested accordingly.The break force of the sized roving was considered as the adhesion force of the sizing to the fiber in the roving method.The experimental results show that the effects of sizing film strength and fiber strength on the adhesive force can be weakened when the concentration 0.5%of size paste is used,instead of 1%in the roving method.The size morphology in the sized roving and on the surface was observed through scanning electron microscopy,in the form of penetration and coverage of the sizing in or on the roving.On the other hand,the Young-Dupréequation was used to calculate the adhesion work.The advantages and disadvantages of roving method and the adhesion work method were compared.The adhesion obtained by both two methods reflects the rule of chemical similarity between warp sizing and fiber.

Fifth Conference of CREEFA

The Chinese Rare Earth Enterprisers FriendshipAssociation(CREEFA)is a non-governmental organi-zation.It organizes a plenary meeting every twoyears,giving RE experts and enterprisers an opportu-nity to exchange information about RE processingtechnology,application,product standards and market,to discuss and seek the possible paths to promote thecooperation between enterprises,and to offer propos-als for the improvement of China RE industry.The fifth conference of CREEFA was held May16-21 this year in Wuxi,Jiangsu Province and wasattended by experts from 78 RE institutions and pro-

产教融合视阈下的新西兰2020职业教育改革

全球化和工业自动化对于技能提出了更高的要求,终身学习成为常态,高等职业教育在技能提升和新技能培训方面发挥至关重要的作用。新西兰职业教育改革是全国范围大规模的改革,突出以行业为主导,重视不同地区发展需求,追求职业教育的卓越和创新,关注少数族裔教育公平,强调职教体系的统一和效能,培养满足学习者、雇主和社区持续变化的技能需求。

China Unveils Its First Mars Probe and Rover

A press conference was held in Beijing on August 23,marking the launch of a public competitive campaign to obtain a name and logo for China’s Mars mission.The project and its progress were introduced at the conference and the external appearance of the Mars probe and the rover was revealed.China’s Mars mission will be implemented in two steps.The objective of the first step is to achieve orbiting,landing,and roving.Mars sampling will be the purpose of the second step。

Effects of Predators on the Belowground Life Stages (Prepupae and Pupae) of the Western Flower Thrips, <i>Frankliniella occidentalis</i>(Thripidae: Thysanoptera): A Review

Western flower thrips, Frankliniella occidentalis, is a major cosmopolitan insect pest causing direct and indirect damage to greenhouse-grown horticultural crops. The primary way of managing western flower thrips populations is by routinely applying insecticides, which target the aboveground life stages: larvae and adult. However, insecticides are minimally effective against the pupal stages (prepupae and pupae) that reside in the growing medium or soil. Therefore, soil-dwelling biological control agents including: predatory mites [Stratiolaelaps scimitus and Hypoaspis = (Geolaelaps) aculeifer], and a rove beetle, Dalotia coriaria may be a viable option to induce mortality on the pupal stages. These predators will feed on the pupal stages of the western flower thrips and can provide mortality on a life stage that is tolerant of insecticide applications. However, these biological control agents need to be used in conjunction with other plant protection strategies, such as insecticides and/or biological control agents that target the aboveground life stages (larvae and adult) to effectively manage western flower thrips populations in greenhouse production systems.

一个国人不熟悉的买家——MG Rover的中国采购

在经济全球化的今天,资本势必向着低成本国家和地区流动。作为汽车制造成本中重要的一个环节,零部件采购也遵循着成本最低化的原则。在全球各大汽车整车和零部件厂商纷纷把亚太采购中心移师中国的时候,NG Rover也不失时机地把亚太采购中心设到了上海。在中国汽车零部件采购贸易洽谈会召开的前夕,本刊对MG Rover国际资源采购亚太区经理杨诗杰(Gemma Stuart Young)女士进行了专访。

挽救MG Rove计划

这是一个长远的计划，不过MG的复苏并不是没有可能的。同样，它还可能实现赢利。AUTOCAR记者与一些知名汽车专家合作，勾勒出一项挽救这一英国著名汽车品牌的计划。

Owens Corning Introduces SE 2350

On November 16th,2005,at the Ameri-can Composite Manufacturers Associa-tion(ACMA)Show,Owens Corning in-troduced SE 2350,a revolutionarysingle-end Type 30 R roving reinforce-ment for high-pressure pipeapplications.Ideal for epoxy-based

China Fiberglass Saw Profit Downturn in 2008

China Fiberglass Company Limited (SH:600176) announced the operating revenueof RMB4.0 billion for 2008,an increase of25.23% over the previous year.The netprofit was RMB244 million,a drop of 18.87%,and earning per-share was RMB0.5719.

PPG Increases Production Capacity of Glass Fiber Reinforcement in Zibo

On January 29th PPG Industries and Sinoma Jinjing Fiber Glass Co.Ltd.announced they will add a third furnace at the 50/50 joint venture PPG Sinoma Jinjing Fiber Glass Co.Ltd.manufacturing site in Zibo,Shandong province of eastern China.The joint venture manufactures glass-fiber reinforcement.The joint venture is expected to add 60 thousand tons of single-end roving production capacity annually.Startup of the third fur-

China Fiberglass to Invest in Two Fiberglass Projects

China Fiberglass Co.,Ltd.(SH:600176)an-nounces that its Board of Directors has ap-proved the 140000 t/a alkali-free fiberglass kiln-drawing production line project in its subsid-iary Jushi Group Co.,Ltd.and the 60000 t/a medium-alkali fiberglass kiln-drawing produc-tion line project in Jushi Group Chengdu Co.,Ltd.The total investment of the two projects is approximately RMB2 361.868 million.Upon completion of these two projects,China Fiber-glass will consolidate its global position

Two new species of the genus Aploderus Stephens(Coleoptera: Staphylinidae) from China

Four species of the genus Aploderus Stephens are recorded from China, including two new species： A. songi sp. nov. and A. zhouae sp. nov. The photographs of the dorsal habitus and male sexual characters are all provided. A key to the Chinese species of Aploderus is provided.