浙江星益达增强材料有限公司

浙江星益达增强材料有限公司创建于2001年,是PVC刀刮涂层防水布和网格布的专业生产厂家,专业生产建筑膜材、卡车篷布、帐篷布、充气材料、游艇布、水池布、广告喷绘材料、投影幕材、网格布等中高档产业用特种纺织品以及经编布、机织布等工业用布。     

浙江星益达增强材料有限公司 做精做强 着眼高端

浙江星益达增强材料有限公司创建于2001年,是PVC刀刮涂层防水布和网格布的专业生产厂家,专业生产建筑膜材、卡车篷布、帐篷布、充气材料、游艇布、水池布、广告喷绘材料、投影幕材、网格布等中高档产业用特种纺织品以及经编布、机织布等工业用布。公司拥有目前国际上最先进的德国全自动宽幅(成品达3.6米)PVC刀刮涂层生产线,还拥有德国双轴向经编织造设备、瑞士片梭织机和配套整经     

玻璃纤维在树脂基复合材料中的应用

玻璃纤维具有强度高、模量大、伸长小、价格便宜等优点,广泛用于树脂基复合材料(增强塑料)的增强材料。本文扼要介绍一些国家玻璃纤维及其树脂基复合材料的生产和需求情况。     

聚合物热解制备玻璃纤维表面碳纳米涂层及其导电性

为实现玻璃纤维的导电功能化应用，分别采用聚对苯二甲酸乙二醇酯(PET)和聚氯乙烯(PVC)为聚合物固态碳源，利用化学气相沉积在玻璃纤维基体表面制备碳纳米涂层得到导电玻璃纤维。借助扫描电子显微镜、拉曼光谱仪、X射线光电子能谱仪、单纤维强力仪、电阻率测试仪研究不同碳源及制备温度对碳纳米涂层导电玻璃纤维的表面化学结构、结合性能、力学性能及导电性能的影响规律。结果表明：利用聚合物固态碳源沉积的碳纳米涂层可以紧密包覆在玻璃纤维表面，且没有裂纹等结构缺陷，涂层在热震循环10～15次内表现出较好的结合性能，不易出现脱落、起泡等结构缺陷，且以PVC为碳源制备的碳纳米涂层与玻璃纤维的结合性优于以PET为碳源制备的碳纳米涂层；导电玻璃纤维的力学性能较原纤维存在一定的降低，形成的碳纳米涂层为具有一定缺陷的sp²杂化多层类石墨烯结构；碳纳米涂层赋予玻璃纤维优异的导电性，在700～950℃的制备温度区间内，玻璃纤维的电阻随温度升高而显著下降，在950℃时以PET为碳源制备的碳纳米涂层玻璃纤维电阻为602.10Ω/cm,以PVC为碳源制备的碳纳米涂层玻璃纤维电阻为181.65Ω/cm。说明在...     

证卡用PVC片基技术要求及检测方法

目前,国内外制卡生产企业使用的制卡材料主要是PVC、PET-G、PET、ABS等几种。其中,PVC以其价格便宜、技术设备成熟的特点,至今仍是制卡产业主要的生产原材料。因此,掌握好PVC制卡材料的技术要求是保证生产顺利进行、提升产品品质的必要条件。现对PVC片基影响制卡生产的几个重要技术指标进行简要讨论。     

热风技术在PVC涂层织物拼接中的应用

PVC涂层织物作为产业用纺织品中的一个品种,在现代的工业和生活中正在得到越来越多的应用。例如膜结构建筑、卡车篷布、游艇材料、帐篷材料、充气材料、泳池布材料、网格布、广告喷绘材料,投影幕材等（如图1所示救生艇）,这些材料的加工工艺多种多样,而热风拼接工艺则是其中非常重要的一种方法。     

新型复合机织布料的开发

用PP(polypropylene)和PE(polyethylene)热塑性树脂共聚物包覆丙纶长丝生产的无卤环保遮阳布料,替代现在市场上广泛使用的聚氯乙烯(PVC)包覆聚酯(PET)或玻璃纤维等长丝制备的包芯丝生产出的机织布。性能优于原产品,且更加环保,便于回收循环利用。     

玻纤细度对玻纤/PVC复合材料隔声性能的影响

为进一步研究玻璃纤维/PVC复合材料的隔声性能,使其性能更加优越,以不同细度的玻璃纤维制成的织物和高阻尼的聚氯乙烯为原料,制备玻璃纤维织物/聚氯乙烯隔声复合材料,并采用双声道分析仪、SEM等对样品的隔声性能、形态结构进行分析测试。结果表明:玻璃纤维的细度对织物及复合材料的隔声性能都有较大的影响;在面密度、厚度等条件基本相同的情况下,玻璃纤维的直径越小,制成的织物及聚氯乙烯复合材料的隔声性能越好。     

玻璃纤维与高强涤纶长丝的力学性能比较

纤维力学性能对复合土工布的加工及使用性能影响很大,本文针对涤纶高强丝和涂布PVC前后玻璃纤维的拉伸性能、准弯曲和勾结的强度进行实验比较.结果表明:普通玻璃纤维与涤纶工业丝虽在拉伸强度上相近,但伸长性和抗弯性的差异明显,故玻璃纤维更需关注其弯曲脆断和磨损;涂PVC玻纤的抗弯性能明显改善,勾结和弯曲强度值提高60%～80%;为提高复合土工布格栅强度,应尽量保证各纤维及纤维束间的平行伸直排列,减少弯折及表面损伤.     

玻纤格栅复合土工布的开发与性能

本文介绍了PVC涂层玻纤格栅复合土工布的试制及其性能 ,并对提高玻纤格栅增强复合土工布的拉伸强度和玻璃纤维的弯曲强度进行了分析和讨论。     

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.     

Chlorohydrins of bisphenol A diglycidyl ether (BADGE) and of bisphenol F diglycidyl ether (BFDGE) in canned foods and ready-to-drink coffees from the Japanese market

BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H₂O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.     

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.     

Textural Properties of Cold-set Gels Induced from Heat-denatured Whey Protein Isolates

A 9% whey protein (WP) isolate solution at pH 7.0 was heat-denatured at 80°C for 30 min. Size-exclusion HPLC showed that native WP formed soluble aggregates after heat-treatment. Additions of CaCl2 (10–40 mM), NaCl (50–400 mM) or glucono-delta-lactone (GDL, 0.4–2.0%, w/v) or hydrolysis by a protease from Bacillus licheniformis caused gelation of the denatured solution at 45°C. Textural parameters, hardness, adhesiveness, and cohesiveness of the gels so formed changed markedly with concentration of added salts or pH by added GDL. Maximum gel hardness occurred at 200 mM NaCl or pH 4.7. Increasing CaCl2 concentration continuously increased gel hardness. Generally, GDL-induced gels were harder than salt-induced gels, and much harder than the protease-induced gel.     

European priorities for research to support legislation in the area of food contact materials and articles

A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.     

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.     

Occurrence of bisphenol-F-diglycidyl ether (BFDGE) in fish canned in oil

The levels of bisphenol-F-diglycidyl ether (BFDGE) were quantified as part of a European survey on the migration of residues of epoxy resins into oil from canned fish. The contents of BFDGE in cans, lids and fish collected from all 15 Member States of the European Union and Switzerland were analysed in 382 samples. Cans and lids were separately extracted with acetonitrile. The extraction from fish was carried out with hexane followed by re-extraction with acetonitrile. The analysis was performed by reverse phase HPL C with fluorescence detection. BFDGE could be detected in 12% of the fish, 24% of the cans and 18% of the lids. Only 3% of the fish contained BFDGE in concentrations considerably above 1mg/kg. In addition to the presented data, a comparison was made with the levels of BADGE (bisphenol-A-diglycidyl ether)analysed in the same products in the context of a previous study.     

Contribution of European research to risk analysis

The European Commission's, Quality of Life Research Programme, Key Action 1—Health, Food & Nutrition is mission-oriented and aims, amongst other things, at providing a healthy, safe and high-quality food supply leading to reinforced consumer confidence in the safety of European food. Its objectives also include the enhancing of the competitiveness of the European food supply. Key Action 1 is currently supporting a number of different types of European collaborative projects in the area of risk analysis. The objectives of these projects range from the development and validation of prevention strategies including the reduction of consumers risks; development and validation of new modelling approaches; harmonization of risk assessment principles, methodologies, and terminology; standardization of methods and systems used for the safety evaluation of transgenic food; providing of tools for the evaluation of human viral contamination of shellfish and quality control; new methodologies for assessing the potential of unintended effects of genetically modified (genetically modified) foods; development of a risk assessment model for Cryptosporidium parvum related to the food and water industries; to the development of a communication platform for genetically modified organism, producers, retailers, regulatory authorities and consumer groups to improve safety assessment procedures, risk management strategies and risk communication; development and validation of new methods for safety testing of transgenic food; evaluation of the safety and efficacy of iron supplementation in pregnant women; evaluation of the potential cancer-preventing activity of pro- and pre-biotic ('synbiotic') combinations in human volunteers. An overview of these projects is presented here.