PVA水溶性纤维在碱锰电池隔膜纸中的应用

采用PVA水溶性纤维作黏结剂与纤维素纤维、合成纤维混合抄造碱锰电池隔膜纸,研究了干燥温度、湿纸张水分、干燥压力、PVA水溶性纤维加入状态和加入量等因素对电池隔膜纸性能的影响。结果表明：采用水溶温度为80℃的PVA水溶性纤维作黏结剂,在干燥温度95℃、湿纸张水分60％、同时施加一定压力时,PVA水溶性纤维可以发挥良好的黏结作用,可以得到吸碱性能良好、物理强度高的电池隔膜纸。另外,对PVA水溶性纤维作一定的预溶胀处理有利于发挥其黏结作用,提高电池隔膜纸性能。     

水溶性PVA合成纤维在低定量纸张中的应用

在低定量纸中添加水溶性PVA纤维作为增强剂，研究了水溶性PVA纤维的加入方式、用量、打浆条件对增强效果的影响。结果表明：水溶性PVA纤维最佳应用条件为PVA用量2．0％，分段磨浆，控制干燥温度70～75℃，纸张各项强度指标有不同程度的提高，干抗张指数提高13．00％，湿抗张指数提高2．06％、撕裂指数提高3.15％、耐折度提高53．33％。说明水溶性PVA纤维对低定量纸张增强效果明显。     

水溶性PVA纤维对包装纸增强作用的研究

在高强度包装纸抄造过程中,使用水溶性PVA纤维做增强剂,研究了水溶性PVA纤维的添加量、加入方式、磨浆条件对增强效果的影响.结果表明,添加水溶性PVA纤维后,纸张抗张强度显著提高,裂断长提高幅度为18.8%～45.8%,撕裂指数、耐破指数也有不同程度的改善.研究确定了水溶性PVA纤维的最佳使用条件为:PVA60用量为6%,两段磨浆,程序升温干燥,此时抄片各项强度指标有不同程度的提高,裂断长提高45.8%,撕裂指数提高32.9%,耐破指数提高17.3%.研究表明水溶性PVA纤维是一种有效的纸张增强剂,制备的高强度纸包装材料生物降解性能好,是真正的绿色包装材料.     

水溶性PVA纤维的黏结状态及其对隔膜纸性能的影响

水溶性PVA纤维常作为高性能碱锰电池隔膜纸的黏结剂,水溶性PVA纤维在干燥过程中的热熔粘结状况严重影响着隔膜纸的各项性能。本文系统研究了水溶性PVA纤维的水溶过程变化、干燥温度对其粘结状态的影响以及对碱锰电池隔膜纸性能的影响。结果表明：在水溶温度为60℃的PVA纤维的水溶过程中,40-50℃间纤维会发生迅速的润胀收缩,呈现半透明状;纯水溶PVA纤维纸在50—60℃干燥时既具有较好的黏结作用又保证具有一定的孔隙率;采用水溶温度为60℃的水溶性PVA纤维作为碱锰电池隔膜纸的黏结剂,干燥温度在60—70℃起到的黏结效果较好。     

PVA伴纺牦牛绒产品退维实验探讨

牦牛绒纤维可纺性能差,纯纺难度大,通过PVA纤维伴纺牦牛绒既可提高牦牛绒纤维的可纺性和可织造性,又能获得高支轻薄的高档纯牦牛绒纺织品。以水溶性PVA纤维与碘能发生特殊的显色反应为理论依据,对PVA纤维伴纺牦牛绒纱线和针织物的退维机理和影响因素进行了实验和探讨。从结果来看溶胀溶解时间和温度对水溶性PVA纤维溶解有较大影响;水溶性PVA纤维的状态不同(如纱线和织物),其溶解性能有一定的差异;要彻底去除PVA纤维,浴比要大些,以采用两浴两步法或三浴三步法退维工艺为好。     

PVA伴纺牦牛绒产品退维实验探讨

牦牛绒纤维可纺性能差,纯纺难度大,通过PVA纤维伴纺牦牛绒既可提高牦牛绒纤维的可纺性和可织造性,又能获得高支轻薄的高档纯牦牛绒纺织品。文章以水溶性PVA纤维与碘能发生特殊的显色反应为理论依据,对PVA纤维伴纺牦牛绒纱线和针织物的退维机理和影响因素进行了实验和探讨。从结果来看,溶胀溶解时间和温度对水溶性PVA纤维溶解有较大影响;水溶性PVA纤维的状态不同(如纱线和织物),其溶解性能有一定的差异;要彻底去除PVA纤维,浴比要大些,以采用两浴两步法或三浴三步法退维工艺为好。     

水溶性PVA纤维及其在水刺法非织造布中的应用

水溶性PVA纤维的许多性能在合成纤维中独树一帜。利用其水溶性能 ,可赋予产品特殊用途。水刺法水溶性PVA非织造布的工艺条件至关重要     

水溶性纤维及其在纺织行业中的应用

水溶性纤维,即水溶性聚乙烯醇(PVA)是一种很有价值的功能性差别化纤维。在三十年代,最初被开发出来的聚乙烯醇(PVA)纤维,是利用它能溶于水这个特点,在德国试制成医用手术用纱和外科缝合线。在第二次世界大战中,美国等国家用PVA纤维制得敷设水雷用的降落伞。在五十年     

PVA纤维伴纺牦牛绒纺纱工艺研究及产品开发

根据牦牛绒和水溶性PVA纤维的性能特点,采用PVA纤维伴纺牦牛绒纤维,从而改善牦牛绒纤维的可纺性能.通过控制牦牛绒/PVA混纺纱的各道生产工艺参数和生产条件,开发出了较低线密度的纯纺牦牛绒纱线.     

测定水溶性PVA纤维溶解度的一种方法

利用水溶性PVA纤维溶液与碘发生显色反应，从测量溶液的吸光度入手设计实验，得出溶液的吸光度同水溶性PVA纤维溶解量成线形关系的结论，该方法为研究工作液中PVA的含量提供依据，对伴纺产品开发过程中优化设计、优化工艺参数有一定的指导意义。     

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