大直径细纱胶辊纺纱试验

分析了大直径细纱胶辊的纺纱性能特点,介绍了前中后胶辊直径的匹配及上销、胶圈的配置.将不同直径的前中后胶辊与不同上销配置进行了纺纱试验,结果表明,前胶辊直径增大至31.6 mm,适当增大后胶辊直径至30.0 mm,中铁辊改用中胶辊并适当增大直径,配置尼龙弹性上销,有利于牵伸稳定,提高成纱质量.     

紫外线光照技术在胶辊表面处理上的应用

分析采用紫外线光照技术对胶辊表面处理的原理及特点,并与传统涂料处理方法进行对比;探讨紫外线光照技术在精梳、并条、粗纱工序,以及在纯棉细号纱等不同品种上的应用,给出了光照处理分离、牵伸、并条胶辊和细纱胶辊的技术参数及不同表面处理方式时胶辊表面粗糙度、成纱质量间的差异。指出:紫外线光照技术并非无局限性,实际使用中要根据纺纱品种、方式及环境等,与复合处理方法结合使用;其在聚氨酯胶辊和段彩纱纺制用胶辊方面的应用仍需探索和创新。     

细纱前后档胶辊直径搭配试验分析

为了了解细纱前后档胶辊直径搭配对成纱质量的影响,采用不同硬度、不同直径的前档胶辊,分别配置不同直径的后档胶辊进行纺纱试验.结果表明:直径28.9 mm、邵尔A65度的ME666型前档胶辊,后档配直径差异小的胶辊对成纱质量有利;直径29.7 mm、邵尔A65度的J463型前档胶辊,后档配直径差异大的胶辊对成纱质量有利;直径29.8 mm、邵尔A68度的W888型前档胶辊,在罗拉中心距不同时,后档胶辊配置有变化.指出:后档胶辊直径大小影响后区对纤维的握持控制能力,纺纱生产中当前档胶辊直径、硬度及罗拉中心距等条件不同时,要注意前后档胶辊直径的合理搭配.     

紫外线处理细纱胶辊的实验和机理分析

紫外线处理纺纱用胶辊国外已用于生产,79年7月在吉林物理研究所协助下,我厂用六种不同波长紫外灯,分别对天津和沈阳产的200个细纱丁腈胶辊进行光照处理之后,在纯棉21支细纱机上运转     

胶辊直径及中铁辊压力与成纱质量关系的探讨

本文就不同的胶辊直径、不同的中铁辊压力进行了纺纱试验对比，说明适当的胶辊直径及中铁辊压力与成纱适宜的加压是保证纺纱牵伸工艺顺利进行和提高成纱质量的关键。     

细纱免处理胶辊回磨后条干恶化的成因

从细纱免处理胶辊回磨后条干恶化的主要纺纱品种、反映结果和其它相关因素等方面,对引起条干恶化的主要因素做了较详细的分析,提出了稳定条干水平的相应技术措施,以及胶辊表面粗糙度对纺纱条干影响的主要技术作用。指出：摩擦因素是引起条干恶化的主要问题,免处理胶辊回磨后应进行化学涂料及紫外线光照处理,但必须根据工艺状态选择最佳的胶辊...     

胶辊前冲工艺改善成纱质量的探讨

为了稳定和提高成纱质量，针对气动加压和弹簧加压的细纱机，采取增加前胶辊前冲量和增大胶辊直径的工艺措施，对不同品种进行了纺纱试验。试验结果表明，合理选用胶辊前冲量，优化纺纱工艺，可以提高成纱务干质量，同时胶辊采用大的前冲量后，胶辊直径从32.5mm用30．3mm后可再连续使用到27mm，胶辊的使用寿命可提高一倍，从而降低了胶辊的消耗成本。     

WRC965型表面不处理胶辊的应用实践

0　前言纺纱胶辊性能的优劣对成纱条干、粗节、细节及断头率影响很大。随着市场竞争日益激烈 ,用户对产品质量要求更高。而胶辊作为关键的纺纱器材 ,对其性能要求也进一步提高。胶辊的内在结构逐渐变化 ,由硬变软。同时 ,对性能影响最敏感的表面处理也逐渐变化 ,由生漆处理到酸处理 ,从新型树脂涂料到现在的双组分涂料处理以及紫外线光照处理等等。这些表面处理使胶辊表面硬度不同 ,处理不好将影响成纱条干质量、胶辊的适纺性能和胶辊的使用寿命。因此 ,各纺织橡胶厂研制出各种不处理胶辊来改变表面处理所产生的不良后果。我公司对ＷＲＣ965…     

HFJ型集聚纺纱装置输出胶辊的使用效果

为了提高HFJ型集聚纺纱装置的使用效果,延长其输出胶辊使用寿命,介绍其牵伸胶辊和输出胶辊的功能,重点阐述输出胶辊硬度和直径要求;对比分析HFJ506型集聚棉纺环锭细纱机上不同材质、硬度和直径规格输出胶辊试纺色纱的质量指标,并以数理统计方法判定试验方案的差异性。结果表明:输出胶辊的硬度和直径对成纱质量无显著影响,无导纱动程集聚纺纱可拓宽输出胶辊的选择范围,其直径为26 mm仍可正常纺纱,胶辊磨砺次数增加,使用寿命延长,生产成本降低;纺纱企业应根据生产实际,选用合适的输出胶辊,每台车上的胶辊直径应一致,且应根据胶辊直径变化调整其位置。     

细纱胶辊选型及其加压工艺的配置

分析了不同结构、不同硬度胶辊对纺纱质量的影响情况，对不同类型胶辊在不同压力下的钳口宽度进行了测试，并用不同型号胶辊在不同加压工艺条件下进行了纺纱试验，优选出适纺不同纱线品种的胶辊及压力值     

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