31dtex/12f锦纶6 DTY加工工艺探讨

探讨了37dtex/12f POY与37dtex/12f HOY两种锦纶原丝的加弹生产工艺,并对其进行了比较。试验结果表明:经采用合理的加工工艺,两种原丝均可制得毛丝少、断头少、可纺性良好的31dtex/12f锦纶DTY。     

22 dtex/68 f锦纶6全牵伸丝工艺及其性能

为了解纺丝工艺参数对22 dtex/68 f锦纶6全牵伸丝性能的影响,以锦纶半光切片为原料,通过高速熔融纺丝制备22 dtex/68 f锦纶6全牵伸丝。文章分别探讨了定形温度、卷绕速度、牵伸倍率、环吹风风压等工艺参数对22 dtex/68 f锦纶6全牵伸丝断裂强度、断裂伸长率、热收缩率以及条干不匀率等物理性能的影响。结果表明：丝束经过高温定形,断裂强度增大,条干不匀率降低。但提高卷绕速度或牵伸倍率,会使断裂强度减小,条干不匀率增大。环吹风风压主要影响纤维的条干不匀率。经过纺丝工艺优化,22 dtex/68 f锦纶6全牵伸丝的断裂强度为5.33 cN/dtex,断裂伸长率为24.37%,条干不匀率为0.83%,生产过程稳定,产品品质稳定。     

锦纶6黑丝70D/24fPOY、DTY的生产工艺探讨

锦纶6 POY、DTY黑丝是目前很多锦纶生产商产品系列中的一种。本文以锦纶6黑丝70 D/24 f POY与DTY为例,通过生产实践探讨了如何进行原料和设备的选择以及生产工艺等的优化。     

细旦锦纶6DTY生产工艺探讨

研究了 6 1dtex 48f锦纶 6DTY在生产过程中的纺丝温度、组件配方、冷却条件、卷绕速度、牵伸倍数、变形温度及D Y比和摩擦片组的选择 ,通过优化细旦多孔丝的工艺控制 ,可防止毛丝及DTY的弹性不良 ,DTY丝的质量符合用户要求。     

55 dtex/136 f锦纶6弹力丝加弹工艺

为了研究加弹工艺对55 dtex/136 f锦纶6弹力丝物理性能的影响,文章以64 dtex/136 f锦纶6预取向丝为原料,制备了55 dtex/136 f锦纶6弹力丝,探讨了不同假捻速比、热箱温度、网络气压和牵伸倍数下55 dtex/136 f锦纶6弹力丝的物理性能指标。结果表明,假捻速比为1.56、热箱温度为165℃、网络气压为1.5×105 Pa、牵伸倍数为1.230时,获得55 dtex/136 f锦纶6弹力丝断裂强度为3.64 cN·dtex-1、卷曲收缩率为9.82%、卷曲稳定性为18.64%,物理性能较优。     

仿毛型复合纤维生产工艺的探讨

在大连合成纤维研究所配置的设备上生产260dtex/48 f×2并列型POY,并在英国Scragg公司的加弹机上加工成167dtex/48 f×2 DTY,严格控制切片的选择、干燥及POY生产工艺,控制DTY的加工工艺技术可以获得高质量的DTY产品。     

涤纶细旦丝产品开发

研究了在普通高速纺设备上开发生产多孔细旦丝的技术关键,采用POY—DTY两步法工艺,生产规格为83dtex/72f,111dtex/72f、167dtex/144f等涤纶细旦低弹丝。在解决原料、纺丝工艺条件、后加工条件的情况下,通过局部改造,可以在普通高速纺设备上开发出来。该产品是一种有开发前途的化纤原料。     

210dtex/36f锦纶PA6中强丝生产工艺实验分析

锦纶中强丝多用在渔业网线,强度要求6～7g/d,可以通过三对牵伸热辊生产得到。文章以210dtex/36f锦纶PA6中强丝生产实验为例,讨论各种工艺条件对生产的影响因素。     

安全气囊涤纶长丝拉伸性能测试分析

针对市场上原料为锦纶的汽车安全气囊生产成本高,而涤纶价格低,强度高,易回用,可轧光的特点,通过长丝性能测试,优选几种适合生产汽车安全气囊涤纶长丝织物的原料,选择166.7dtex/48f、466dtex/70f、230dtex/72f、280dtex/48f作为生产安全气囊的原料。     

锦纶6FDY纺牵一步法工艺

介绍了78dtex/24f锦纶6FDY的生产设备、所用原料及工艺参数,着重阐述了纺丝及卷绕工艺中的技术关键。     

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