非织造土工布的性能、特点及其应用推广

土工布是近年来在国际上逐渐得到广泛应用的土工工程材料。文章主要论述了非织造土工布的种类、特点及其性能,并简要介绍了其功能和应用范围。     

土工织物在堤坝护坡上的合理选用

近几年,土工织物材料发展迅速,大量应用于岩土工程。江苏省1998年在防汛工程、省江海堤防达标工程及长江口治理工程中,已应用各类无纺土工布及无纺复合土工布约400万平方米。1998年11月由水利部发布的行业标准“水利水电工程土工合成材料应用技术规范SL/T225-98”(以下简称规范)也提出应用土工织物材料。     

经编土工合成材料(续一)

土工合成材料是一种聚合物织物,用于道路建设、排水管道、码头工程、防水堤坝、地面改造及许多其它的土木工程和环境工程。常用的经编土工织物有定向结构和复合结构。土工布的主要功能是分隔、增强、稳定、过滤、排水、防水和保护。中主要介绍了经编土工织物的结构、经编针织土工布的有关性能及测试方法,论述了土工布的设计原则,并例举了土工布工程应用实例,同时预测土工合成有着广阔的发展前景。     

土工布在太平庄挡潮闸加固工程中的应用

土工布又称土工织物,它是一种新型的工程材料,在水利工程中,它可替代砂石材料和水泥,起到滤层作用、防渗作用和加筋作用等。本文介绍了土工布在大型水闸加固中的设计及使用情况,其目的是为了推广这种新的工程材料的使用。     

仪征无纺布厂产品获国家免检

近日，江苏省仪征市无纺布厂的土工材料产品正式获得了“国家免检产品”称号，该厂是国家重点土工材料生产企业，从意大利、德国、奥地利等国家全套引进具有世界先进水平的聚酯纺粘生产线、短纤土工布及土工复合膜生产线，年生产能力达6000吨。主要产品有聚酯长丝土工布、长丝烧毛土工布、短纤土工布、复合土工膜、PE／EVA／ECB防水板、软式透水管、油毡基布、地板革基布等。     

评估土工合成材料的抗紫外线及耐化学老化性能

土工织物是一种土工合成纤维织物,具有增强／保护、分离、过渡和排水功能,广泛地用于土工技术和环境保护领域。尤其是其中的非织造土工布由于其具有各种应用功能,如分离、增强、过渡和排水等,在120个特殊领域中得到广泛的应用。在使用期间维持土工布的性能非常重要。聚丙烯和聚酯纤维主要用于生产土工布,土工布的耐气候性能正是由其聚合特性决定的。聚合物材料的外线、氧气、碱性和酸性土壤及土壤沥出液、微生物如酶和真菌等存在的环境中的稳定性和其他性能。特别是曝露于紫外线条件下能造成聚丙烯材料的光降解,从而造成聚合物链的分离或发生硬化和破裂。同时放置于侵蚀条件下和高pH值、高温的废液中,聚酯也可能加快土工织物的化学降解作用。废物处理系统处于曝露条件下的土工布会发生性能衰减,许多研究者已经通过试验验证了这些结论。本文探讨将生产出来的抗紫外线性能和化学稳定性能都得到了改善的土工合成材料,应用于废物处理领域以取代白色聚丙烯非织造布。     

非织造土工布在太仓中远国际城围堤吹填工程中的应用

以围堤工程为例,介绍了非织造土工布作为反滤层在工程中的应用情况,并总结了土工织物的应用意义和适用性。     

适用于纺织及其它工业建设用针刺无基土工布研制成功

以涤纶、丙纶、维纶、锦纶、氯纶等原料,采用针刺工艺生产的无基土工布在江苏仪征无纺布厂研制成功.它适用于纺织、轻工、水利、桥梁、涵洞、隧道等基本建设工程,系新型的土工材料.使用土工布施工方便,缩短工期、减轻劳动强度,节约人力和费用,对工程抢险更为有利.产品特性为:     

土工布

土工布给大地技术带来了最大的革命。确切地说,它使得绝大部分土工构造物的设计创新成为可能。土工布品种繁多,完全不同的产品结构、组成材料及机械性能,不仅能使技术显著提高,且能降低总体成本,所有这些不能不使工程师们感到震惊。     

TGB型土工合成材料摩擦性能测试机简介

“土工布”亦称“土工织物”，系应用于土木建筑工程中的纤维织物的总称。随着高分子化学工业的迅速发展，合成纤维新种类和高分子聚合物新材料大量涌现，这种新型材料已超越传统的“织物”范畴，如土工膜、土工格席垫、成型塑料片、土工网和复合型土工材料等，这些材料相继在岩土建筑工程中应用，故被定名为“土工合成材料”。     

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