经浆工序提高4040府绸实物质量的措施

一、提高经轴均匀度 (一)大经轴表面不平整的形成分析我厂整经机采用两道筘均匀布纱,通过后筘(一字形弹簧伸、缩筘),把整经头份控制到轴幅宽度,借上下玻璃棒,把纱条限制在一个水平面上,纱条又通过前筘(斜刀形伸缩筘片),达到均匀排布,为经轴均匀卷绕创造了条件。我厂4040府绸整经头份8个轴是561根,1个轴为564根,经轴轴幅为1380毫米,纱条在前筘的均匀分布下,相邻两纱条的中心距L约2.59毫米,两纱空隙距L约2.45毫米,按原固定前筘的情况,纱条在两侧筘齿的控制下,卷绕到大经轴时,首先是按其纱条排列的     

防静电隐条织物的生产实践

总结防静电隐条织物的生产要点。介绍了导电纱的制备工艺、织物经纬纱质量指标;整经工序采用小张力、低车速工艺;浆纱工序,优选浆纱张力、车速、浆料配方等,保证浆纱质量;穿筘工序,采用3入/筘+4入/筘穿法,以较好地隐藏导电纱;织造工序,优化上机工艺,减少停车。采取一系列技术措施后,最终织物顺利生产,织机效率达85%以上,下机一等品率达95%,产品合格率达99%。认为:针对产品特点采取相关工艺优化是保证生产顺利的关键。     

天丝/PBT色织弹力绉织物的设计与生产

采用14.6 tex天丝/PBT混纺弹力纱与14.8 tex天丝纯纺纱按1:4间隔排列,利用凸条组织与平纹相结合,使布面形成局部泡泡和凸条,开发出一种天丝/PBT色织弹力绉织物.简要介绍了PBT纤维性能与应用特点;对产品生产过程中的纱线染色、整经、浆纱、织造及后整理等工序的关键生产技术要点作了全面分析与介绍.织物经整理...     

整经机伸缩筘横动机构的设计

1452A型整经机伸缩筘是固定的。借鉴国外先进经验,加装伸缩筘横动机构是个花钱少见效大的项目。伸缩筘作积极的导纱动作可使经纱排列均匀,卷绕密度一致,经轴表面平整。伸缩筘横动动程和频率的确定十分重要,定得不好非但达不到预期的目的,反而使操作困难,断头被邻纱压住,不易找头。为此本文提出了一个计算方法,并对几种横动机构进行了     

整经轴卷绕纱线的局部凹陷对浆纱伸长的影响

在生产实践中,我们发现由于整经机伸缩筘筘齿疏密不均等原因,造成经轴纱线卷绕局部凹陷。在浆纱退绕中,纱线的凹陷对浆纱的伸长影响很大,不容忽视。一、整经轴卷绕纱线局部凹陷产生的原因 1.整经起机时,边纱同经轴轴盘没对齐(边对小),造成经轴边纱凹陷。 2.整经机伸缩筘部分筘齿疏密不均,筘齿     

竹浆纤维纱与聚乳酸纱交织物的开发

总结竹浆纤维纱与聚乳酸纱交织物的开发要点。以竹浆纤维9.8 tex纱为经纱,聚乳酸纤维9.8tex纱为纬纱,介绍了产品的设计思路。合理选配经纬纱,有效结合平纹和五枚三飞缎纹的特点,设计了花形组织图和反织上机图,不同组织采用不同纬密;介绍了整经、浆纱、穿筘、织造等工艺要点,重点优化了喷气织机上机织造要点,最终保证产品顺利生产。认为:开发的竹浆纤维纱与聚乳酸纱交织物平整顺畅,手感饱满,可用于家纺床单、被罩等面料。     

色织轴经上浆

色织纯棉、化纤纯纺、混纺纱织物,国内色织行业上浆工艺应用较多的有轴经上浆与单轴上浆二种工艺。现据我厂多年生产经验,将轴经上浆排花工艺要点简介于后。一、排花方法 1.分轴分层法分轴分层是将经纱分色分轴整经,不需要在整经机上排花,经并轴上浆分绞后,片纱呈分层状态,其优点是:(1)浆缸伸缩筘处分头均匀织轴平整。(2)分色排列,花型可以按层次均匀取纱,便于记忆。经纱排列适宜于     

棉粘胶双层织物的生产

总结棉粘胶双层织物的生产工艺。介绍了JC 19.4tex纱和R 19.7tex纱的质量指标;棉纱与粘胶纱按1∶1排列做表里经和表里纬;分析了产品的生产难点;优选整经工艺参数和两种经纱各自的浆料配方、浆纱工艺;选用ZAX9100型喷气织机,织机速度650r/min,上机后,织机效率达90%以上,下机一等品率达92%以上。认为:合理优选工艺参数及工艺措施,可以保证双层织物的顺利生产。     

1452A-180型整经机分股装置

为了提高整经工序好轴率,保证浆纱起机时经轴与经轴之间纱线接头方便,达到张力均匀一致,整经值车工在每只经轴卷满(预定长度)后,必须将纱线均匀地分成16股,并把每股纱头嵌入经轴纱层内不使脱出。 1452A-180型整经机没有分股装置,分股完全靠值车工凭经验或用尺量将整幅纱片分成16股,这样不仅速度慢.而且难以完全做到分股均匀。为了方便值车工均匀分股,曾在伸缩筘     

异经嵌条织物的开发

为解决异经嵌条织物在浆纱生产过程中存在的两种经纱不容易分清的问题,对异经嵌条织物的浆纱工艺及操作方法进行了改进,在浆纱操作管理上采取了一系列有效措施。对C 27.8 tex(OE)和C 58.3 tex(OE)两种经纱分别在双浆槽浆纱机的不同浆槽中采用相同的浆料配方进行上浆,浆纱过程中要保证纱线排列均匀,避免发生经纱交叉现象。通过严格执行浆纱工艺,加强操作管理,保证了两种经纱达到工艺要求的上浆率和回潮率,实现了上机织造的顺利进行,使织造效率达到90%以上。     

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