赛络纺棉氨纶包芯纱的生产及应用

为了提高弹力牛仔布质量,试纺了赛络纺棉氨纶包芯纱,并与传统环锭纺棉氨纶包芯纱的成纱质量进行了对比.通过合理配棉,优化纺纱工艺,赛络纺棉氨纶包芯纱顺利纺制,其条干、强度及毛羽等主要质量指标优于传统环锭纺棉氨纶包芯纱,且包覆效果好,织制的弹力牛仔布布面光洁,纬向缩率减小,纬向色档疵点消除.     

赛络纺棉/氨纶包芯纱工艺探讨

赛络纺棉/氨纶包芯纱既具有赛络纱条干好、毛羽少的优点,又能发挥氨纶高弹性的特点,是生产各类弹性织物的理想原料。对赛络纺棉/氨纶包芯纱的主要工艺参数(捻系数、须条间距、氨纶丝预牵伸倍数)与纱线质量(毛羽、强度、断裂伸长、条干均匀度)的关系进行了试验和优化分析,为纺制赛络纺棉/氨纶包芯纱提供了参考。     

赛络纺棉/氨纶包芯纱纱疵成因及其预防措施

为改善弹性包芯纱的包覆效果,提高包芯纱成纱品质,采用赛络纺技术纺制棉/氨纶包芯纱。针对包芯纱生产过程中易产生偏丝、无丝等纱疵问题,介绍了赛络纺棉/氨纶包芯纱特有的纱疵种类及危害,分析了偏丝、无丝、裸丝、弹力不匀、割丝等纱疵的主要成因。从原料、工艺、设备等方面入手,采取预防和消除纱疵的措施,如选择品质优良的棉和氨纶丝原料、优化粗细纱工艺、严控络筒工艺条件、加强设备关键部件的周期性维护保养和严控操作管理等。实践表明:通过合理选配原料、优化配置工艺参数、加强设备精细管理和严控日常操作管理等方法能够较好地解决包芯纱因包覆效果不良产生偏丝断头等问题,提高了赛络纺棉/氨纶包芯纱的品质。     

纺纱方法对棉海藻纤维氨纶包芯纱性能的影响

探讨纺纱方法对棉海藻纤维氨纶包芯纱性能的影响.采用赛络纺和传统环锭纺两种纺纱方法、5种外包纤维混纺比纺制棉海藻纤维氨纶包芯纱,并进行了性能测试分析.结果表明:纺纱方法对棉海藻纤维氨纶包芯纱质量有较大影响,采用赛络纺可明显地提高成纱强伸性能、改善条干、减少有害毛羽.外包纤维中,棉与海藻纤维混纺比以65/35时,所获得的纺纱改善效果较好.认为采用赛络包芯纺工艺以及适宜的外包纤维混纺比,可改进在棉海藻纤维氨纶包芯纱成纱质量.     

赛络纺包芯纱工艺试验与成纱结构分析

介绍了利用赛络纺纱技术纺制棉氨包芯纱的原理、装置与工艺以及生产中存在的问题和采取的技术措施;将赛络纺棉氨包芯纱的成纱质量和成纱结构与环锭纺普通棉氨包芯纱进行了对比分析,结果表明,赛络纺棉氨包芯纱强伸性好、毛羽少、结构紧密、包覆效果好.     

赛络纺毛/氨包芯纱生产实践

探讨了毛纺赛络纺毛/氨包芯纱的生产工艺.介绍了毛纺赛络纱的工艺原理,通过对原有细纱机的锭带、氨纶装置、中皮辊凹槽和其他附属设备进行设备改造,使其适应赛络纺的生产要求.对赛络纺复精梳工艺进行优化,选用较小的粗纱定量,合理的氨纶预牵伸倍数和氨纶丝位置,在细纱工艺中,调整喇叭口中心距,选用较大的细纱捻系数,并优化络简工艺和生产管理,能够顺利生产赛络纺毛/氨包芯纱.同时,能够充分发挥赛络纺纱线强力高、毛羽少、条干好的优点.     

赛络纺弹性包芯纱的生产

赛络纺工艺集细纱、并线、捻线为一体 ,具有经济效益高 ,纱线条干均匀、毛羽少、截面圆 ,织物轻薄及耐磨等特点 ,在普通细纱机上加装适当装置即可纺制赛络纱。氨纶具有良好的伸缩性能 ,以氨纶长丝为纱芯 ,涤棉为外包纤维纺制的包芯纱 ,既能发挥氨纶的高弹性能 ,又能保持棉纤维的吸湿性能好、穿着舒适及涤纶高强耐磨的优点 ,因此是各种弹性织物的理想原料。在棉纺细纱机上加装适当装置后可纺制赛络纺弹性包芯纱。这种纱除了具有赛络纱和氨纶包芯纱的优点之外 ,还可避免包芯纱的生产过程中由于工艺缺陷或设备状态不良等造成的露芯、空鞘等包芯…     

赛络纺在棉/Modal氨纶包芯纺纱中的应用探讨

文章介绍了用赛络纺技术进行棉／Modal氨纶包芯纺纱的应用探讨,并对赛络纺包芯纱和普通环锭纺包芯纱的纱线结构和性能进行了研究对比分析。     

玄武岩长丝赛络纺包芯纱的试验研究

文章简单介绍了赛络纺包芯纱的成纱机理和影响纱线性能的主要工艺参数,并介绍了在改进的环锭纺细纱机上纺制棉/玄武岩赛络纺包芯纱所采取的措施及工艺参数的设置。     

空心罗拉式集聚纺包芯纱的工艺优化

探讨空心罗拉式集聚纺包芯纱的工艺优化。选用吸风压力、细纱捻系数、钢丝圈号数、氨纶丝预牵伸倍数等工艺参数,通过进行四因素三水平正交试验,优选出JC 14.8 tex(44.4 dtex)、JC 11.8 tex(44.4 dtex)两种棉氨纶包芯纱较优的纺纱工艺,并与同号网格圈式集聚纺棉氨纶包芯纱、传统环锭纺棉氨纶包芯纱进行了质量对比。认为:空心罗拉式集聚包芯纺采用优化后的工艺配置可纺制出质量较好的棉氨纶包芯纱。空心罗拉式集聚纺包芯纱和网格圈式集聚纺包芯纱的质量都明显优于传统环锭纺包芯纱。两种集聚纺包芯纱条干及强伸性能接近,3 mm毛羽数量基本相当,但空心罗拉式集聚纺包芯纱短毛羽数量相对较多,可在减少有害毛羽的同时,较好地满足某些织物保持手感柔软的要求。     

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.     

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