竹节纱工艺参数的自动识别

为提高竹节纱工艺参数的检测速度和检测精度,提出了利用计算机检测竹节纱的方法。阐述了竹节纱工艺参数检测的基本原理,并用自行研制的竹节纱检测系统测试了给定样纱,得到了竹节纱粗细信号的时间序列图,竹节长度、竹节间距序列图,竹节长度分布图,竹节间距分布图以及竹节倍率分布图,与竹节纱设置的初始工艺参数进行了对照,具有很好的一致性,并对产生的误差进行分析,从而证明了该系统的有效性,对指导实际生产具有重要意义。     

竹节纱的生产方法

综述了通过改造环锭纺纱机和转杯纺纱机生产竹节纱的方法以及改造的发展趋势,并对目前市场上的竹节纱产品作了简单介绍。     

竹节纱的开发与应用

1前言娄底纺织厂在对纯机械式竹节纱生产设备与全自动竹节纱专用生产设备进行研究分析的基础上，对传统细纱机进行局部技术改造，自制了专用于生产竹节纱的控制装置，并采取了相应工艺措施，使产品的品种和风格多样化，大大改进了竹节纱的性能，也提高了经济效益。2机构设计原理及分析在国产细纱机上纺制竹节纱，主要是对原牵伸传动系统进行改装。运用机械传动的原理，改变其单一的传动形式，设计了瞬时改变前罗拉速度的装置即专用控制器。其原理为：2．1控制器生产时电子控制器装于车头顶面上，可在机随时操作、记忆、数码显示，每次设定的…     

SCV-Ⅲ型竹节纱装置工艺设计

为开发CJ 14.5 tex竹节纱、CJ 9.7 tex竹节纱,在FA502型细纱机上配套安装了SCV-Ⅲ型竹节纱装置进行纺纱实践.分析了竹节纱竹节粗度、竹节间距及竹节长度规格参数的设计方法,对实际纱号、前罗拉速度、竹节纱捻度、产量进行了计算和设计.指出:设计竹节周期和竹节间距等工艺参数时,应反复验算不能出现倍数关系或接近倍数关系,避免出现竹节的规律性排列,以提高竹节纱产品的布面效果.     

一种竹节纱生产的网络监控系统

为方便竹节纱的生产管理,在现有的竹节纱生产装置单机控制的基础上,利用计算机技术、串口通信技术等,设计出一种竹节纱生产的网络监控系统。将竹节纱生产装置用RS-422网络连接起来,用一台主控计算机进行监控,可以查看车间内各台机器的生产工艺参数,控制多台细纱机纺同一品种的竹节纱或根据需要纺不同品种的竹节纱,并可对生产工艺参数进行实时修改。简介了系统设计思路和系统硬件组成结构及其软件设计使用的技术,并对如何采集数据及实现通信进行了分析。     

转杯纺纱机生产竹节纱的原理分析

在转杯纺纱机纺杯上加装阻尼块可以生产短竹节纱，改变喂棉速度和引纱速度可以纺制长竹节纱。介绍了利用可编程序控制器和变频器对BD200RCE型、BD200SN型转杯纺纱机进行传动改造生产长竹节纱的方法；分析了高速喂棉时间、正常速度喂棉时间、变速倍数、纺杯直径及机械惯性对转杯纺竹节纱规格的影响；介绍了选定转杯纺竹节纱捻系数应考虑的因素及开发生产的转杯纺竹节纱产品。     

Bamboo/玉米纤维混纺竹节纱的软硬件设计及工艺开发

文章简述了Bamboo纤维、玉米纤维混纺竹节纱的智能系列竹节纱生产装置及改造方案,分析了单片机控制系统的软硬件设计,对使用本系统的竹节纱工艺设计进行了具体分析,并对Bamboo纤维／玉米纤维混纺竹节纱弹力布进行了试织和测试。     

棉氨纶包芯竹节纱的开发

根据氨纶包芯竹节纱的纺制原理,对细纱机进行改造,加装氨纶丝装置和竹节装置,同时采用合理的工艺参数,加强操作管理,生产出了成纱质量达到要求的棉氨纶包芯竹节纱产品。     

竹节纱过捻细节的产生及其预防

本文分析了在竹节纱生产过程中，竹节纱粗节对加捻过程的影响，并对竹节纱过捻细节的产生机理以及预防措施进行了探讨。     

竹节纱测试指标的分析和应用

为了及时了解所生产的竹节纱的质量状况，介绍了竹节纱的特点，分析了利用条干仪进行竹节纱质量控制的主要性能指标和图形，筒述了这些指标和图形的实际应用方法。     

Reliable identification of grapevine rootstock varieties using RAPD PCR on woody samples

Since grapevine ( Vitis spp .) rootstock material is being traded increasingly as disbudded woody material a lack of distinctive morphological features on such material necessitates an alternative and reliable means of identification. Methods described here were developed for rapid and efficient extraction of DNA from woody samples rich in phenolic compounds and polysaccharides, and for subsequent identification of varieties by RAPD PCR. Using these methods, and with the application of only one selected RAPD primer, we were able to differentiate sixteen rootstock varieties, including the seven varieties most commonly used in Germany. Problems commonly encountered with reproducibility of RAPD patterns were avoided by choosing primers with a dinucleotide sequence and a high G/C content that allowed a rather high annealing temperature of 45°C. Methods described here should also be useful for other horticultural crops, especially those with woody tissues rich in phenolic compounds and polysaccharides.     

An internet compendium of analytical methods and spectroscopic information for monomers and additives used in food packaging plastics

An internet website (http://cpf.jrc.it/smt/) has been produced as a means of dissemination of methods of analysis and supporting spectroscopic information on monomers and additives used for food contact materials (principally packaging). The site which is aimed primarily at assisting food control laboratories in the European Union contains analytical information on monomers, starting substances and additives used in the manufacture of plastics materials. A searchable index is provided giving PM and CAS numbers for each of 255 substances. For each substance a data sheet gives regulatory information, chemical structures, physico-chemical information and background information on the use of the substance in particular plastics, and the food packaging applications. For monomers and starting substances (155 compounds) the infra-red and mass spectra are provided, and for additives (100 compounds); additionally proton NMR are available for about 50% of the entries. Where analytical methods have been developed for determining these substances as residual amounts in plastics or as trace amounts in food simulants these methods are also on the website. All information is provided in portable document file (PDF) format which means that high quality copies can be readily printed, using freely available Adobe Acrobat Reader software. The website will in future be maintained and up-dated by the European Commission's Joint Research Centre (JRC) as new substances are authorized for use by the European Commission (DG-ENTR formerly DGIII). Where analytical laboratories (food control or other) require reference substances these can be obtained free-ofcharge from a reference collection housed at the JRC and maintained in conjunction with this website compendium.     

Aroma characterization of various apricot varieties using headspace–solid phase microextraction combined with gas chromatography–mass spectrometry and gas chromatography–olfactometry

The characterization of the aromatic profile of several apricot cultivars with molecular tracers in order to obtain objective data concerning the aromatic quality of this fruit was undertaken using headspace–solid phase microextraction (HS–SPME). Six apricot cultivars were selected according to their organoleptic characteristics: Iranien, Orangered, Goldrich, Hargrand, Rouge du Roussillon and A4025. The aromatic intensity of these varieties measured by HS–SPME–Olfactometry were defined and classified according to the presence and the intensity of grassy, fruity and apricot like notes. In the six varieties, 23 common volatile compounds were identified by HS–SPME–GC–MS. Finally, 10 compounds, ethyl acetate, hexyl acetate, limonene, β-cyclocitral, γ-decalactone, 6-methyl-5-hepten-2-one, linalool, β-ionone, menthone and (E)-hexen-2-al were recognized by HS–SPME–GC–O as responsible of the aromatic notes involved in apricot aroma and considered as molecular tracers of apricot aromatic quality which could be utilized to discriminate apricot varieties.     

Tests of potential functional barriers for laminated multilayer food packages. Part I: Low molecular weight permeants

The advent of the functional barrier concept in food packaging has brought with it a requirement for fast tests of permeation through potential barrier materials. In such tests it would be convenient for both foodstuffs and materials below the functional barrier (sub-barrier materials) to be represented by standard simulants. By means of inverse gas chromatography, liquid paraffin spiked with appropriate permeants was considered as a potential simulant of sub-barrier materials based on polypropylene (PP) or similar polyolefins. Experiments were performed to characterize the kinetics of the permeation of low molecular weight model permeants (octene, toluene and isopropanol) from liquid paraffin, through a surrogate potential functional barrier (25 μm-thick oriented PP) into the food simulants olive oil and 3% (w/v) acetic acid. These permeation results were interpreted in terms of three permeation kinetic models regarding the solubility of a particular model permeant in the post-barrier medium (i.e. the food simulant). The results obtained justify the development and evaluation of liquid sub-barrier simulants that would allow flexible yet rigorous testing of new laminated multilayer packaging materials.     

Chlorohydrins of bisphenol A diglycidyl ether (BADGE) and of bisphenol F diglycidyl ether (BFDGE) in canned foods and ready-to-drink coffees from the Japanese market

BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H₂O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.     

European priorities for research to support legislation in the area of food contact materials and articles

A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.     

Analysis of benzo[a]pyrene in spiked fatty foods by second derivative synchronous spectrofluorimetry after microwave-assisted treatment of samples

A simple, rapid and inexpensive method has been developed for the determination of benzo[a     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. II: Certification study

This paper describes the second part of a project undertaken to develop certified mussel reference materials for paralytic shellfish poisoning toxins. In the first part two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin and decarbamoyl-saxitoxin in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the certification exercise. Fifteen laboratories participated in this certification study and were asked to measure saxitoxin and decarbamoyl-saxitoxin in rehydrated lyophilized mussel material and in a saxitoxin-enriched mussel material. The participants were allowed to use a method of their choice but with an extraction procedure to be strictly followed. The study included extra experiments to verify the detection limits for both saxitoxin and decarbamoyl-saxitoxin. Most participants (13 of 15) were able to meet all the criteria set for the certification study. Results for saxitoxin.2HCl yielded a certified mass fraction of <0.07 mg/kg in the rehydrated lyophilized mussels. Results obtained for decarbamoyl-saxitoxin.2HCl yielded a certified mass fraction of 1.59+/-0.20 mg/kg. The results for saxitoxin.2HCl in enriched blank mussel yielded a certified mass fraction of 0.48 +/- 0.06 mg/kg. These certified reference materials for paralytic shellfish poisoning toxins in lyophilized mussel material are the first available for laboratories to test their method for accuracy and performance.     

Announcing a new international peer-reviewed journal:Food Science and Human Wellness now accepting manuscript submission in English

<正>We are pleased to announce the launch of a new international peer-reviewed journal-Food Science and Human Wellness,ISSN 2213-4530,which is an open access journal,produced and hosted by Elsevier B.V.on behalf of Beijing Academy of Food Sciences.Food Science and Human Wellness is an international peer-reviewed English journal that provides a forum for the dissemination of the