吸风口倾角与紧密纱性能关系的研究

探讨了紧密纺吸风口倾角对纱线性能的影响.对CJ7.3 tex、CJ9.7 tex、CJ11.7 tex、CJ14.6 tex、CJ18.2 tex、CJ27.8 tex 6个品种进行了吸风口倾角与成纱质量关系的试验.结果表明:吸风口倾角为5°时对于纺制线密度较小的纱线有利;吸风口倾角为9°时对于纺制线密度较大的纱线有利;吸风口倾角7°时对各种线密度的纱线都有很强的适应性,尤其有利于中等线密度纱线性能的提高.     

网格圈目数与纱线性能的关系

网格圈是紧密纺纱技术的关键部件,其空隙的大小及织造密度的高低都影响纱线的性能。分析了不同目数的网格圈对不同线密度纱线性能的影响,讨论了纺制不同线密度纱线对网格圈的选择。     

网格圈目数与纱线性能关系的研究

网格圈是紧密纺纱技术的关键部件,其空隙的大小及织造密度的高低都对纱线的性能有影响。现分析不同目数的网格圈对不同线密度纱线性能的影响,同时探讨纺制不同线密度纱线对网格圈的选择。     

网格圈日数与纱线性能关系的研究

网格圈是紧密纺纱技术的关键部件,其空隙的大小及织造密度的高低都对纱线的性能都有影响。现分析不同目数的网格圈对不同线密度纱线性能的影响,同时讨论了纺制不同线密度纱线对网格圈的选择。     

网格圈目数与纱线综合性能关系的研究

网格圈是紧密纺纱技术的关键部件，其空隙的大小及织造密度的高低都对纱线的性能有影响。文章分析了不同目数的网格圈对不同线密度纱线性能的影响，同时讨论了纺制不同线密度纱线对网格圈的选择。     

空心罗拉式和网格圈式紧密纺成纱质量对比

简述了空心罗拉式紧密纺的成纱机理,并通过纺制C29.2 tex、CJ14.6 tex、CJ9.7 tex、CJ7.3 tex纱线,对空心罗拉式紧密纺和普通环锭纺、三罗拉网格圈式紧密纺、四罗拉网格圈式紧密纺在成纱质量方面进行了对比分析,通过分析指出:空心罗拉式紧密纺的成纱质量优于普通环锭纺纱,其成纱质量水平与网格圈式紧密纺基本相同。     

四罗拉紧密纺V型牵伸纺纱实践

在经过四罗拉网格圈型紧密纺改装的EJM128K型细纱机上,采用V型牵伸分别纺制9.8 tex 65/35T/CJ和CJ14.6 tex纱线,探讨四罗拉紧密纺V型牵伸的性能、特点,并与直线牵伸进行对比。认为:在四罗拉紧密纺上采用V型牵伸可以有效改善纱线条干,减少纱线毛羽,同时增强细纱机的品种适应性。     

全聚纺与网格圈紧密纺成纱质量对比

探讨了全聚纺与网格圈型紧密纺的装置结构及其成纱机理。采用全聚纺装置、三罗拉网格圈型紧密纺装置、四罗拉网格圈型紧密纺装置在相同工艺条件下分别纺制精梳纯棉7.4 tex、11.7 tex、19.4 tex纱线和紧密赛络纺18.2 tex、11.7 tex精梳纯棉纱线,并对纱线性能进行对比分析。分析结果表明:全聚纺相比三罗拉、四罗拉网格圈紧密纺在加工高支纱上具有一定的优势。     

应用灰色聚类方法评价特种动物纤维综合物理性能

为更好地开发特种动物纤维制品,以骆驼绒、山羊绒及牦牛绒为研究对象,在相同环境下分别对9种动物纤维的长度、细度、强力、卷曲性能及摩擦性能进行测试,利用灰色聚类分析评价特种动物纤维的综合物理性能。以白山羊绒、黄骆驼绒和黑牦牛绒为原料,采用四罗拉网格圈集聚纺分别纺制线密度为14.29 tex 和20.83 tex纱线,并进行性能测试和对比分析,进一步验证灰色聚类方法评价特种动物纤维综合物理性能的结果。结果表明:白山羊绒、驼绒具有较好的物理性能,白羊羔绒次之,紫山羊绒、青牦牛绒、黑牦牛绒、青山羊绒和脱色牦牛绒的物理性能最差;采用四罗拉网格圈紧密纺纺制不同线密度的纱线,白山羊绒纱线的整体性能最好,黄骆驼绒纱线次之,黑牦牛绒纱线最差,与灰色聚类方法所评价的纤维综合物理性能一致。     

不同集聚纺筒纱毛羽变化分析

分析网格圈式集聚纱和中空罗拉式集聚纱络筒后的毛羽变化情况.测试了两种集聚纱络筒前后毛羽的外观结构和毛羽增长率,并从其成纱原理上进行了分析.试验表明:纱线线密度为9.7 tex时,中空罗拉式集聚纱的毛羽增长较少;纱线线密度为14.6 tex时,两种集聚纱的毛羽增长率相差不大;纱线线密度为30 tex时,中空罗拉式集聚纱的毛羽增长明显大于网格圈式集聚纱.认为:两种集聚纺筒纱毛羽的变化与两种集聚纺集聚形态密切相关.     

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