集聚纺细纱机使用压力棒隔距块对成纱质量影响的研究

在集聚纺细纱机上使用压力棒隔距块,与普通隔距块的成纱质量进行对比试验,结果表明在集聚纺细纱机上使用压力棒隔距块成纱质量有所提升。在CJ15.3tex和CJ14.6tex品种上进行实践,结果表明纱线成纱条干CV值、千米粗节、千米细节、千米棉结等指标都有所改善。     

压力棒隔距块在棉纺中的应用

为了探讨在棉纺生产中压力棒隔距块对成纱质量的影响,分析了压力棒隔距块的原理,并在FA506型环锭细纱机上加装不同型号的压力棒隔距块分别纺制出CJ9.7 tex、CJ7.3 tex纱线,测试纱线的毛羽、强力、条干等各项指标并进行对比分析。结果表明,在棉纺中使用压力棒隔距块后,成纱条干有所改善,成纱强力变化不大,成纱毛羽的变化也不明显。     

压力棒上销对成纱质量的影响

探索细纱前区附加压力棒隔距块的纺纱牵伸浮游纤维控制工艺对成纱质量的影响情况，分析了目前普通上销隔距块的特点及有压力棒隔距块的工作原理。对采用普通隔距块和压力棒隔距块在环锭纺上纺制CM7．3tex纱，进行测试成纱条干。对比结果表明：压力棒上销能明显控制细纱牵伸前区浮游纤维，明显降低成纱条干CV和千米细节、粗节和棉结。     

压力棒上销对成纱质量的影响

探索了细纱前区附加压力棒隔距块的纺纱牵伸浮游纤维控制工艺对成纱质量的影响情况,分析了目前普通上销隔距块的特点及有压力棒隔距块的工作原理.测试对比了普通隔距块和带有压力棒上销的隔距块在环锭纺上纺制CM7.3tex的成纱条干.结果表明:压力棒上销能明显控制细纱牵伸前区浮游纤维,明显降低成纱条干CV和千米细节、粗节和棉结.     

蚕蛹蛋白改性粘胶纤维混纺集聚纱的纺制

探讨蚕蛹蛋白改性粘胶纤维混纺集聚纱的生产工艺.阐述了蚕蛹蛋白改性粘胶纤维的性能特点,从产品定位入手,通过在原料选配、纺纱工艺配置及质量控制等方面采取措施,成功纺制出精梳棉/莱赛尔纤维/蚕蛹蛋白改性粘胶纤维50/30/20 11.7 tex集聚纱.认为:只要合理选配原料,对蚕蛹蛋白改性粘胶纤维进行纺前预处理,采用正确的混和工艺,合理配置各工序工艺,就可以纺制出质量满足要求的蚕蛹蛋白改性粘胶纤维混纺集聚纱.     

细纱机使用压力棒隔距块的效益分析

通过纺制C 14.6 tex K、C 18.2 tex K纱时分别使用好原料、加精梳条、使用压力棒隔距块的对比试验,分析了在细纱机上使用压力棒隔块对成纱质量和原料成本的影响;指出使用压力棒隔距块能有效提高成纱质量,降低用棉,节约成本。     

棉Formotex木棉混纺纱的生产实践

为顺利纺制棉Formotex木棉混纺纱,针对混纺纤维的性能特点,采用包混工艺,并对木棉纤维进行纺前预处理;开清棉工序重点减少纤维损伤;并条工序合理设置罗拉隔距和后区牵伸倍数;粗纱工序适当增大捻系数,以减少意外牵伸;细纱工序优选钢领、钢丝圈型号,以减少成纱毛羽;络筒工序合理设定清纱器参数,清除有害纱疵,最终成功纺制出棉/Formotex/木棉60/30/10 14.5 tex纱,其质量满足了使用要求。     

细纱工序应用新型隔距块的体会

在FA506A型细纱机上,分别采用带压力棒隔距块和普通隔距块纺制JC 14．5tex纱,试验结果表明：压力棒隔距块对降低条干CV值、＋20％棉结和CVb值效果明显。文中还给出了带压力棒隔距块的使用方法和注意事项。     

27．8tex亚麻／棉加压力棒上销赛络纺工艺探究

在细纱机上加装压力棒弹性上销后,通过试纺27．8tex精梳亚麻／棉混纺赛络纱,研究了后区罗拉隔距和后区牵伸倍数对成纱质量的影响,并分析了压力棒对纱线条干的改善作用。     

芳砜纶桑皮纤维棉19.4 tex混纺纱的生产

探讨芳砜纶/桑皮纤维/棉19.4 tex混纺纱的生产工艺。针对芳砜纶、桑皮纤维和棉纤维的性能特点,纺前对纤维进行预处理,采用桑皮纤维棉纤维包混后与芳砜纶纤维条混工艺,合理配置开清棉和梳棉工艺;并条采用三道混并、防静电胶辊、重加压、大隔距、倒牵伸、低速度工艺;粗纱适当提高回潮率,选用较小定量和较大捻系数,严格控制纺纱张力;细纱采用低速度、中捻度、重加压、小钳口工艺;络筒采用小张力、低速度工艺,并合理配置电清参数,最终成功纺制出芳砜纶/桑皮纤维/棉50/30/20 19.4 tex混纺纱。     

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