Outlast腈纶混纺针织纱的生产实践

为了顺利生产Outlast腈纶混纺针织纱,分析了Outlast腈纶纤维的性能特点,并在纺纱过程中针对性地采取了工艺技术改进措施。通过纺纱前喷洒抗静电剂;清梳工序适当降低各打击梳理机件速度,放大梳理隔距;并条工序采用重加压、大隔距、轻定量工艺原则;粗纱工序选用较小的后区牵伸与较大的罗拉隔距;细纱工序在较大粗纱捻系数的基础上,采用较大的后区隔距、较小的后区牵伸、低速度等工艺;各工序严格控制温湿度,结果成功纺制出棉/Outlast腈纶60/40 18.3 tex混纺针织纱,达到了较好的质量水平。     

竹浆纤维混纺涡流纱的纺制

探讨竹浆纤维棉混纺涡流纱的生产工艺.针对竹浆纤维特点进行原料加湿预处理,较好地解决了生产中的静电现象.采用条混工艺以保证准确的混纺比.开清棉采用“短流程、多松少打、多梳少落”的工艺原则;梳棉采用“轻定量、低速度、紧隔距”的工艺原则,减少棉结和短绒;并条工序合理配置牵伸工艺;涡流纺工序对牵伸倍数、喷嘴压力、喷嘴与前罗拉隔距等工艺参数进行优选,最终顺利纺制出了竹浆纤维/棉70/3014.7 tex混纺涡流纱,质量达到了较好的水平.     

Development of Softwarm Fiber Blended Vortex Knitting Yarn

探讨Softwarm纤维混纺涡流针织纱的生产工艺.根据纤维的性能特点,通过原料预处理,合理配置前纺工艺,优选涡流纺牵伸倍数、罗拉隔距、集棉器规格、纺纱速度、喷嘴型号、纺锭型号、喷嘴压力等工艺参数,成功纺制出5种不同原料及混纺比的涡流针织纱.认为:这些涡流纱能够较好地满足不同类型和风格织物的要求,拓宽了Softwarm纤维的应用范围.     

PLA纤维与棉纤维混纺14.6tex针织纱的生产实践

介绍PLA纤维的特性，探讨PLA纤维与棉纤维混纺针织纱的纺纱工艺及在生产中应注意的一些问题，如开清棉“多松轻打、以梳代打”，降低打手速度；梳棉降低刺辊、锡林和道夫的转速，并保证锡林和刺辊之间有较大的速比；并条、粗纱、细纱适当降低前罗拉速度，放大罗拉隔距，采用较小的后区牵伸倍数，等等。结果表明：纱线各项质量指标能满足产品的质量要求。     

减少腈纶羊毛混纺针织纱纱疵的实践

为减少腈纶纤维与羊毛混纺针织纱的纱疵,针对膨体腈纶纤维和羊毛纤维的特性,通过开清棉工序防止棉卷退绕黏卷,梳棉工序防止缠绕胶辊,并条工序合理配置前罗拉速度,粗纱工序加强假捻器和锭翼空心臂的清洁,细纱工序优选钢丝圈及罗拉隔距,使得成纱疵点减少,成纱条干得到改善.     

棉PTT混纺针织纱的生产

为了顺利纺制出棉PTT混纺针织纱,针对PTT纤维的特性,通过合理配棉,采用棉包预混和棉条混和的两步混和法,优选清梳工序各部速度与隔距,并条、粗纱、细纱工序控制好纺纱张力,络筒工序合理设置电清参数,严格控制温湿度,确保了棉PTT混纺针织纱的顺利生产。     

棉铜离子改性涤纶混纺纱的生产

为了顺利的纺制出棉铜离子改性涤纶混纺纱,开清棉工序提高纤维转移率;梳棉工序适当分梳纤维;并条工序采用三道并合;粗纱采用适宜的捻系数,防止意外牵伸;细纱采用重加压、较小的后牵伸倍数和钳口隔距、较大的后牵伸隔距:络筒适当降低络纱速度、加严电清参数设置,使棉/铜离子改性涤纶69/319.7 tex混纺纱得以顺利生产,且成纱质量达到了使用要求.     

精梳棕棉/Newdal/纳米绒转杯纺混纺纱的开发

为了顺利开发18.2 tex 70/20/10精梳棕棉/Newdal/纳米绒转杯纺混纺针织纱,针对棕棉、Newdal纤维和纳米绒的性能特点及纱线混纺比,采取混合成卷、两步混料的纺纱工艺路线;和毛加油工序重点解决了纳米绒静电大、易损伤、成卷难、易缠绕罗拉胶辊等问题;通过优化各部件的速度与隔距,梳棉机的针布型号,并条工序的道数、并合数、后牵伸倍数及定量,转杯的规格和转速,分梳辊的转速及针布型号等,保证了该混纺纱的顺利开发,成纱质量满足使用要求.     

精梳长绒棉超细腈纶eks赛络纺针织纱的生产

探讨精梳长绒棉/超细腈纶/eks 40/35/25 14.6 tex赛络纺针织纱的生产方法。介绍了长绒棉、超细腈纶和eks纤维的性能特点。根据三种纤维的性能特点和成纱质量要求,采用将超细腈纶与eks纤维原料混合纺制成预并条,再与精梳棉条进行三道混并条的混和方法,有效控制混纺比例;清棉工艺上,对细超腈纶和eks纤维纺纱采取"多松少打,多梳少落,低速度,大隔距"及防黏卷措施;梳棉工艺采取抬高给棉板,使用密封式小漏底,适当降低各部速度和放大锡林与盖板隔距等措施;并优化配置并条、粗纱、细纱和络筒等工序工艺参数;控制好各工序温湿度;顺利生产出精梳长绒棉/超细腈纶/eks纤维40/35/25 14.6 tex赛络纺针织用纱。认为:采取相应的技术和管理措施,可完成此产品的开发及满足质量要求。     

导湿涤纶甲壳素竹棉混纺纱生产工艺要点

探讨导湿涤纶甲壳素竹棉四合一混纺纱的生产工艺要点.介绍了导湿涤纶纤维、甲壳素纤维、竹纤维的特性.优选了四种纤维混纺比例,确定了混和方案和纺纱工艺流程.梳棉采用"多梳、少落、轻定量、中隔距、小张力"的工艺原则;并条采用"低速度、中定量、大隔距、顺牵伸";粗纱和细纱采用"低速度、大隔距、中捻度"的工艺原则.实践表明,纺纱顺利,成纱质量稳定,达到用户要求.     

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