废旧塑料原料与竹加工剩余物制作竹塑复合板的试验研究

以废旧聚丙烯塑料颗粒和竹材加工剩余物为原料，通过共混粉碎、平压复合技术制成一种复合板材。探讨了密度、物料配比、热压工艺等条件对复合板产品性能的影响，获得优化的工艺参数。试验结果表明：所压制的复合板性能良好，复合板在制造和使用过程中无甲醛等有害气体释放，在长期使用报废后仍可再生利用。     

用于汽车内饰件的竹纤维／丙乙烯纤维复合材料研制

探讨了复合板的热压压力、物料配比、热压时间等条件对产品性能的影响,得出了最优化的工艺参数。并介绍了此种复合片材在汽车零件上的应用。     

金属爆炸复合板及其在造纸工业中的应用

1金属复合板的制造方法及爆炸复合板的特性金属复合板的制造方法比较多，如轧制、浇铸、粉沫冶金、堆焊等，但这些方法的应用均受到一定的限制，如生产设备、复合板的使用条件、产品规格和性能等。为此，世界上各主要发达国家在过去的甘多年里都投入了大量的人力和物力研究爆炸焊接技术，并应用这一先进技术制造各种组合的金属复合板，从而克服了上述诸种工艺方法的局限性和缺点，为金属复合板的制造和应用开辟了新的途径。爆炸焊接就是利用炸药爆轰作为能源，在所选的金属板的表面包覆上不同性能的金属板材的工艺方法。用这种方法将两种或…     

爆炸金属复合板的生产及在制盐工业中的使用

爆炸金属复合板目前广泛运用于制盐工业的主体设备的制造，其复合生产工艺简单，产品性能优良，价格低廉。我厂针对在蒸发室、加热室的设计及制造使用爆炸金属复合板而提出的技术疑问均得到完好解答。     

单板塑料发泡复合功能板的研制

研究利用脲醛树脂胶、异氰酸酯、聚醋酸乙烯酯乳液胶和改性的聚醋酸乙烯酯乳液胶对木材和聚苯乙烯泡沫塑料材料进行复合.同时试验得出复合板的最佳生产工艺,并测试复合板的胶合性能、保温性能和隔音性能,结果表明复合板的保温性能、隔音效果良好,可作为墙体保温、隔音、装饰材料.     

浅析粗糙度对竹木复合板胶合性能的影响

针对粗糙度对竹木复合板胶合性能的影响进行了研究,通过对不同粗糙度表面竹材和杉木单板进行胶合,比较不同粗糙度表面对竹木复合板胶合性能的影响,研究结果表明,粗糙度对竹木复合胶合板的胶合性能影响显著.     

复合钢板的化工压力容器制造工艺研究

目前,复合钢板压力容器已被广泛地用于化工、石油、医疗等各个行业,对环保有着重要的作用。这主要是由于复合板的压力容器比碳钢的压力容器更耐压,耐腐蚀性更好,不但扩大了容器的应用领域,而且其价格也较不锈钢材质压力容器更为低廉,降低了生产成本。尽管复合板压力容器有着许多优点,但是目前国内还没有几家公司能制造出这种复合钢板的压力容器。这是因为复合板压力容器的生产技术相对较复杂,是一项新技术,目前国内尚无专门的技术人员,所以,对复合钢板压力容器制造工艺进行分析有着极为重要的现实意义。     

浅谈双相不锈钢复合板在制盐设备中的应用

本文以00Cr22Ni5M03N(2205双相不锈钢)复合板为例.介绍了双相不锈钢及其复合板的焊接工艺,以及复合板以其优良耐蚀性能和较低制造成本在制盐设备中的应用.     

热处理对钛钢复合板界面硬度的影响

钛/钢复合板经过爆炸焊接,其复合界面产生剧烈塑性变形,界面硬度对后续钻孔、卷曲等加工都会产生较大影响,通过500℃、550℃、600℃三种退火温度,保温时间分别定为2小时、2.5小时、3小时、3.5小时、4小时对钛钢复合板进行热处理,结果表明:钛钢复合板退火温度控制在540±10℃,保温时间小于3小时可获得较好的结合性能和合适的界面硬度,满足后续加工要求。     

DIY家具的材料创新——新型无醛木塑复合板的应用与实践

本文针对目前应用于DIY家具的材料类型不多,需要寻求一种性能优异的新材料。速生材与塑料薄膜复合的无醛复合板是一种可以利用低等级的人工林制造的新型胶合板,具有性能稳定、生态环保、价格适中和工艺简单的特点,能进行多元的表面装饰;文章结合学生的课程实践,探讨在DIY家具中如何开发应用无醛木塑复合板,实现家具易拆装、能组合的特点,以适合网络营销模式,满足个性化的消费需求;同时提高家具的个性化特点和附加值,拓宽家具的用材资源。     

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.     

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.     

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.     

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