南纸废纸脱墨浆车间300t/d生产线改造

联系实际生产,介绍了南纸股份有限公司废纸脱墨浆车间300t／d生产线改造的成功经验,为废纸脱墨浆抄造其他纸种进行了有益的探索。     

热分散机运行中存在的问题及解决途径

在废纸脱墨浆生产流程中,热分散机运行的正常与否对成浆质量有较大影响。可通过提高浆料温度、改善螺旋挤浆机运行状况,保证进入热分散机浆料干度及改变热分散机磨片磨齿数和结构等方法,来达到改善热分散机运行性能,提高成浆质量的目的。     

办公废纸脱墨生产线的试运行

江门甘蔗化工厂股份有限公司利用奥地利引进的脱墨设备,以废旧办公废纸为原料,试产高白度文化用纸脱墨浆,用１００％脱墨浆在２３６２ｍｍ纸机上抄造成５２ｇ／ｍ＾２胶印书刊纸,成纸质量达到ＱＢ１２１１－９１标准。笔者对此进行了 初步探讨。     

新闻纸纸机干网清洗方法

介绍了以废纸脱墨浆为主要原料的新闻纸抄造过程中,严重影响纸机运行性能的干网沉积物形成的原因和危害,概括了去除这些沉积物常用的方法.     

废纸脱墨废水的初级处理

废纸脱墨废水的初级处理广州造纸有限公司许达生广州造纸厂投资兴建日产８０吨废纸脱墨浆车间，以旧报纸和旧杂志纸为原料，用浮选脱墨工艺生产脱墨浆，用于配抄新闻纸，在引进奥地利安德里茨（Ａｎｄｒｉｔｚ）公司的关键生产技术设备的同时，引进了废水处理的气浮装置。...     

废纸浆脱墨效果的评价指标分析

结合福建省南纸股份有限公司废纸脱墨浆的生产实践,依据在线的BT-5300白度变送器检测特点,通过对废纸脱墨浆生产过程中的IE值、DEM值及ERIC值的计算,分析了废纸浆脱墨效果的评价机理。     

低定量涂布纸原纸配抄特性的研究

在对进口漂白针叶木硫酸盐浆(NBKP)、进口化机浆(CTMP)、碱性过氧化氢机械浆(APMP)、废纸脱墨浆(DIP)这四种浆料进行比较分析的基础上,进行了不同工艺方案的配抄试验,从而优选出不同浆料生产低定量涂布纸原纸的最佳工艺配比.     

控制好DIP胶黏物,等于成功了一半

正浆纸技术(作者陈金山张菊先)6月15日报道:废纸脱墨浆生产工艺中,流程选择、废纸配比、废纸质量控制、脱墨剂选择等至关重要,但是胶黏物控制更重要。下面介绍了岳阳纸业有限公司用于配抄高档文化印刷纸的DIP浆料胶黏物控制技术。废纸浆的胶黏物种类繁多,主要有三种类     

黄蜀葵根浆料和废纸浆的制备及其配浆应用

为了探讨研究黄蜀葵这种含有粘液质的植物纤维原料制浆造纸可行性和优越性,对黄蜀葵根进行制浆造纸性能方面的化学成分分析,并与麦草茎秆原料进行了比较。结果表明：黄蜀葵根纤维原料的综纤维素含量72.56%比麦草茎秆原料68.42%高,而木素含量较低。采用造纸碱法制浆和机械法处理制备得到半化学半机械浆,筛选洗涤后再进行第一段次氯酸盐(H)漂白,白度从原浆的32.8%提高到38.0%,再进行第二段过氧化氢(P)漂白,白度从38.0%提高到50.3%。利用自制脱墨剂和其他脱墨化学品配合使用,应用浮选法脱墨工艺,制备得到废弃实验报告纸的废纸脱墨浆,白度从脱墨前的80.3%提高到86.5%。废纸脱墨浆与漂白后的黄蜀葵根浆料配抄无碳复写纸原纸,当黄蜀葵浆料和废纸浆料的最佳配比是5∶5,此时无碳复写纸原纸胚体的抗张指数最大,达到7.43 N·m/g。增强剂加入能提高纸页强度,黄蜀葵浆料和废纸浆料在最佳浆料配比5∶5时所抄制纸页的强度在增强剂的加入量为3%时,纸页抗张指数提高到11.26N·m/g,纸页强度有所提高。结论：黄蜀葵根是一种可开发利用的造纸原料。     

pH值对脱墨浆灰分保留和浮选效果的影响

废纸脱墨制浆生产线在生产出优质浆料的同时,应尽量地提高废纸制浆得率。广纸九号机配套的脱墨生产线中,对生产线进行良好的控制,提高浆料中灰分保留率,而又不影响浮选脱墨效果,让生产线稳定高效的运行,生产出符合纸机抄造的优质浆料。PH值作为脱墨制浆系统控制的一个重要的参数,其变化对脱墨生产过程有着很大的影响。     

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