我国中西部地区制丝厂确保丝片回潮率的探讨

针对我国中西部大部分地区的气温低、气候干燥，造成制丝厂生产的生丝丝片回潮率偏低，生丝的切断次数多的特点，提出确保丝片回潮率，应对现有的设施、设备进行增添和改造，同时对温湿度进行科学管理。     

我国中西部地区制丝厂确保丝片回潮率的探讨

针对我国中西部大分地区的气温低，气候干燥，造成丝厂生产的生丝丝片回潮率偏低，生丝的切断次数多的特点，提出确保丝片回潮率，应对现有的设计，设备进行增添加改造，同时对温湿度进行科学管理。     

文摘天地

97735我国中西部地区制丝厂确保丝片回潮率的探讨／许才定等／丝绸技术，1997，NO、3，26-28针对我国中西部大部分地区的气温低、气候干燥，造成制丝厂生产的生丝丝片回潮率偏低，生丝的切断次数多的特点，认为要确保丝片回潮率，应对现有的设施、设备进行改造，同时对温湿度进行科学管理。97736旋转多臂机原理及其电子控制／李志祥等／丝绸技术，1997，No,3，12－17（25）旋转式电子多臂机是目前国际上最先进的多臂机之一。文章介绍了旋转多臂机工作原理及其电子控制系统，并对电子控制系统设计框图及控制程序作实例介绍。9门对无梭织机…     

减少生丝切断次数提高生丝强伸度

分析了造成生丝切断次数多、生丝的强力和伸长低的原因，指出了制丝厂如何从加强工艺管理、操作管理和设备管理等方面来提高生丝强伸度、减少生丝切断次数的措施。     

自动缫丝用茧的煮茧工艺初探

一、序言 近年来,我国的大部分丝厂都已进行了设备的更新改造,使用了定纤式国产新型自动缫丝机。但是,使用了自动缫丝机以后,不少的丝厂,特别是我国中西部地区的许多丝厂,除了台时产量有明显提高外,其生丝的质量、缫折和经济效益等效果并不理想,主要存在的问题是生丝纤度的均方差大、总差大和缫折大(简称为“三大”)。产生“三大”的主要原因,     

减少生丝切断次数，提高生丝强伸度

本文较全面地分析了产生生丝切断次数多，生丝的强力和伸长度成绩低的原因；较系统地指出了制丝厂如何从加强工艺管理、操作管理和设备管理等方面来提高生丝强伸度、减少生丝切断次数的措施。     

自动缫缫丝生产的技术总结（1）：强化管理、做小生丝纤度偏差、总差及缫折

针对我国中西部地区制丝厂拉立缫机更新为自动缫丝机后,普遍存在着生丝纤度均方差大、纤度最大偏差大和缫折等“三大”问题,分析了造成这些问题的主要原因,介绍了自动缫缫丝的特点和为了根治“三大”问题必须强化的工艺管理,操作管理和设备管理的重点。     

检尺器自动化

纤度检验是生丝检验的主要项目之一。从目前情况看,我国丝厂大都使用手工操作的检尺器摇取小绞丝,该检尺器的主要缺点是。小(竹戓)退绕张力突变或纤度落细时,丝条易产生切断,抽样工往往不能立即制动检尺器,每百回丝可能少1～5回,直接影响着检验的准确性。     

制丝厂生丝检验抽样数量的探讨

针对制丝厂生丝检验抽样数量不统一的问题，提出了一种规范制丝厂生丝检验抽样数量的方法，它有利于减少耗丝量，并经实践验证是可行的。     

各地动态

四川武胜丝厂是一九七二年七月才投产的一家新厂。这个厂在一九七三年,接受了由于切断多而降级,使生丝等级不高的教训,从各方面采取措施,使生丝切断逐月下降,     

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