纸机流浆箱的发展综述

流浆箱是造纸机的关键部件,纸机车速的提高和市场对纸张质量的要求使得流浆箱在结构、性能和控制上都在不断地改变和提高。本文对流浆箱的发展历程进行了简单概述,重点介绍了敞开式流浆箱、气垫式流浆箱、水力式流浆箱、半水力式流浆箱的结构及其特点,并对未来流浆箱的发展趋势进行了展望。     

Master Jet-G流浆箱在高速新闻纸机上的应用

介绍了VOITH公司MasterJet-G高湍流式流浆箱的结构、主要功能以及流浆箱的设计参数、流浆箱的压头控制、流量控制、横幅定量控制及流浆箱的操作.     

PMP集团再次向印尼造纸厂成功交付Intelli-Jet V^TM型流浆箱

继2007年年初成功交付Intelli-Jet V^TM型流浆箱后,印尼某造纸厂决定再次选择PMP集团作为其后续流浆箱的供应商。值得一提的是,该厂此前在新的“4纸机底网上已经安装了PMP的Intelli-Jet V^TM型流浆箱。此次Intelli-Jet V^TM流浆箱全部采用不锈钢材料制成,流浆箱侧板宽度为4900mm,流浆箱装有浓度调节系统。     

流浆箱的设计与改造实例

流浆箱的发展是由造纸机车速不断提高推动的 ,从翻浆闸板式流浆箱 ,敞开式匀浆辊流浆箱 ,气垫匀浆辊流浆箱发展到当今水力式流浆箱都是为了适应纸机车速增加的要求。所以在选择流浆箱时 ,也要根据造纸机的速度要求进行。流浆箱的结构形式很多 ,但从功能划分 ,都是由三大部分组成 ,即布浆器、匀浆装置、喷浆装置。流浆箱设计也是围绕这三部分进行。目前流浆箱大致可分为二大类 :（１）匀浆辊流浆箱（敞开式、气垫式） ,见图１ ;（２）水力式流浆箱（满流式、半水力式） ,见图２。以上两大类流浆箱在解决布浆、匀浆、喷浆这三个问题都围绕着流…     

平底敞开式流浆箱浆料流动数学模型研究

近几年来,有的文化用纸的低速造纸机在流浆箱改造时,套用了通常用于车速较高的造纸机的流浆箱的元件(如阶梯扩散器、孔板配上消能棒和导流片,等等),但由于流浆箱和元件设计不够合理,主要参数选择不当,从而导致效果不佳,没有达到降低成纸横幅定量差和改进匀度的目的。国外对低速造纸机流浆箱的研究很少,流浆箱方面的研究工作大都集中在车速较高的造纸机流浆箱。例如瑞典KMW公司在研究KMW气垫流浆箱时对孔板的布浆整流性能进行了     

适用于中、低速造纸机的新型集流式飘片流浆箱结构及性能模拟试验研究

在分析了敞开式流浆箱、气垫式流浆箱和引进的用于大型高速造纸机的集流式飘片流浆箱的结构和性能的基础上,结合我国国情的需要,提出适用于中、低速造纸机的新型结构的集流式飘片流浆箱,进行试验模型的结构研究和设计以及模型的试验研究工作,并对其机理进行分析。结果表明:这种新型的集流式飘片流浆箱结构合理,有较佳的性能,适用于中、低车速的造纸机,对飘片流浆箱的机理也提出了一些新的看法,为我国新型集流式飘片流浆箱的研究提供理论依据和实用数据。     

造纸机流浆箱的功能及其最新进展

本文描述了造纸机流浆箱的基本功能。回顾了流浆箱的发展历史，对21世纪以来流浆箱的最新进展进行了介绍。     

稀释水水力式流浆箱结构与控制

介绍了Metso公司OptiFlo流浆箱和Voith公司MasterJet流浆箱的结构及其构件的功能与区别,在分析稀释水水力式流浆箱控制要点及难点的基础上,提出了基于PLC稀释水水力式流浆箱本体控制系统及其横幅定量控制系统的控制方案。     

稀释水流浆箱的类型及其对横幅定量的控制

重点介绍目前造纸机上采用的几种稀释水流浆箱（包括Allimand公司的FP流浆箱。Voith公司的Master Jet F／B流浆箱,Metso公司的OptiFlo流浆箱、Retro Dilu流浆箱和ValFlo流浆箱）的工作原理和通过稀释水进行横幅定量控制的方法。     

MC稀释水型水力式流浆箱关键技术的开发

介绍了三大类型流浆箱之一的水力式流浆箱的特性,重点介绍了MC稀释水型水力式流浆箱及稀释水横幅定量调节的关键技术.     

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