ESPERO-M型自动络筒机毛羽研究

毛羽是衡量纱线质量的重要指标之一,细纱和络筒工序对纱线毛羽的影响最大。现研究ESPERO-M型自动络筒机毛羽控制问题,探讨络纱速度、络纱张力及管纱大小对三种不同纱支纱线毛羽的影响。实验结果表明:在一定范围内,纱线毛羽随着络纱速度增加而增加;纱线毛羽数并不完全随张力增加而增加,当纱线控制器气压在50mbar～80mbar之间时,纱线有害毛羽随张力的增加先减后增;当管纱由顶端退绕到底端时,络纱毛羽增加。     

ESPERO-M型自动络筒机毛羽研究

毛羽是衡量纱线质量的重要指标之一,细纱和络筒工序对于纱线毛羽的影响最大,对此研究了ESPERO-M型自动络筒机毛羽控制问题,通过纺纱试验探讨了三个主要工艺参数:络纱速度、络纱张力及管纱大小对三种不同纱号纱线毛羽的影响。试验结果表明:在一定范围内,纱线毛羽随着络纱速度增加而增加;纱线毛羽数并不完全随张力增加而增加,当纱线控制器气压在5.0kPa～8.0kPa时,纱线有害毛羽随张力的增加先减后增;当管纱由顶端退绕到底端时,络纱毛羽增加。     

精梳纱络筒工序工艺探讨

分析络筒工序对CJ29.2 tex和CJ9.7 tex两种精梳纱毛羽的影响,从络纱速度和络纱张力两个因素,探讨了纱线毛羽在络纱速度和络纱张力相互影响、相互制约下的增长情况,并确定了两种纱线工艺参数调整的最优方案,使高速络筒时毛羽增长幅度达到最小.     

浅析自动络筒机对细纱毛羽的影响

基于络筒工序细纱管纱高速退绕因自身摩擦、纱线张力的影响使纱线毛羽增加的现状,提出在自动络筒机上加装气圈控制器或加装PERLA-A型涡流毛羽减少装置,不仅将使毛羽明显减少,还可提高纱线强力,并具有其它积极效果。通过在相同工艺条件下自动络筒机加工同号数紧密纱与普通纱的不同毛羽增加情况对比,分析认为产生毛羽的根源是细纱工序,并非是自动络筒机加工的原因。     

槽筒材质和表面状态对纱线毛羽的影响

纱线毛羽形成于细纱工序,增长于络筒工序,为控制纱线毛羽的增长,研究了1332M型络筒机的槽筒材质和表面状态对纱线毛羽的影响.测试了CJ 27.8 tex纱的1 mm～9 mm 管纱毛羽与筒纱毛羽,并对四种不同材质和表面状态的槽筒产生的毛羽数量进行了统计对比.通过对3 mm筒纱毛羽数量与3 mm 管纱毛羽数量的比值(倍增系数)进行比较,认为:经过络筒工序后,纱线的毛羽数量增加3倍～5倍,钢质槽筒增加的毛羽数量最少,胶木槽筒增加的毛羽数量最多.     

络简张力和速度对纱线毛羽的影响

络筒张力和速度是络筒工艺中2个重要的参数，通过工艺试验和测试，得出了络筒张力及络纱速度与纱线毛羽的增长不完全符合正相关的结论。在实际生产时可采用优选的络纱速度和张力，以降低络纱毛羽，提高络纱质量。     

纱线毛羽的分布及络筒工序对纱线毛羽的影响

叙述了国内外对纱线毛羽的研究状况，阐述了评价纱线毛羽分布的方法，同时指出络筒张力、速度对涤、棉筒子纱线毛羽的影响，发现并分析了涤纶纱毛羽指数着络纱速度提高而先增后减的特殊现象。     

络筒工序纱线毛羽的测试与降低措施

通过工艺试验和专题测试 ,分析了管纱的退绕张力、筒纱卷绕直径、槽筒形状、络筒机型、上蜡工艺等因素对络纱毛羽的影响 ,探讨了降低络纱毛羽的有效措施。     

高温少雨季节控制筒纱毛羽增长的措施

由于空调手段单一,为解决高温少雨季节络筒毛羽增长率上升迅速的问题,从分析细纱管纱毛羽和络筒筒纱毛羽统计数据入手,通过试验数据和实例说明了络筒筒纱、毛羽增长率和络筒张力、车速、揩车周期及温湿度等密切相关。指出:控制筒纱毛羽及其增长是一个系统工程,必须加强成纱前的物理指标(粗纱回潮率和捻系数)和成纱后的温湿度,络筒张力、速度等方面的控制,从工艺、设备、运转上全面进行调整,特别应注意加强设备、操作方面的基础工作,从根本上重视温湿度对筒纱毛羽增长的影响,才能全方位地控制好筒纱毛羽指标。     

基于高速摄影分析络筒过程纱线毛羽变化

分析影响络筒毛羽增长的主要机械部件.利用高速摄像机拍摄了纱线经过自动络筒机几个主要机械部件处的运动形态,通过i-SPEED Viewer软件观察经过各机械部件后纱线毛羽增加的数量,分析络筒机上筒纱毛羽产生的主要部位.结果表明:经过络筒,纱线有害毛羽数大量增加,其中张力装置和槽筒装置对纱线毛羽的影响最大.认为应对张力装置和槽简装置进行进一步研究,更有效地减少络筒毛羽的增加,以达到有针对性地控制毛羽的目的.     

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.     

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     

Chinese CTP Market

According to Printing and Printing Equipment Industries Association of China（PEIAC）＇s statistics to the plate manufucturer in China, in 2013, the actual offset plate production has reached 346 million square meters in China. Among them, the CTP production volume was 245 million square meters, up by 11% than that of last year; the total sales of the CTP plate was 239 million square meters, up by 13%.     

Preparatory Work of Print China 2015 is Going Smoothly

正Held at Guangdong Modern International Exhibition Center,Print China 2015 will cover 7exhibition halls,besides the original Hall No.3,4,5,6,7,the newly built F zone of Hall 3 will be used too.The total area will be140,000 square meters.Hall 3:Offset and large printing equipment,package printing equipment,post press