废报纸脱墨浆的漂白

有效地利用脱墨废纸浆,不仅可以节约大量木材,降低生产成本,节水节电,而且无氟漂白还降低了排污负荷,保护了生态环境。对废报纸脱墨浆漂白进行研究,目的在于提高废纸浆的白度,进一步扩大其使用范围。1．试验原料及方法用于漂白的废纸浆为美国进口#8废报纸脱墨浆,其脱墨工艺条件为Na0H1％,SD－5（脱墨剂）1．1％,液比1：25,温度70℃（药液）,时间30min。纸浆的漂白在塑料袋中进行,采用恒温水浴加热。2漂白工艺条件新闻纸主要是由机械浆（MP）、化学机械浆（CMP）和化学热磨机械浆（CTMP）等高得率纸浆抄造而成,漂白应选…     

进口彩印杂志废纸浆息氧漂白工艺的研究

对脱墨废纸浆的臭氧漂白工艺进行研究,结果表明：在适当的工艺条件下采用臭氧漂白技术,可以将经常脱墨技术处理的进口彩印杂志废纸浆进一步提高至８４．５％ＳＢＤ,该浆具好的物理强度性能。     

碎浆和浮选条件对混合办公废纸脱墨的影响

研究了美国混合办公废纸（MOW）在不同碎浆浓度以及碎浆时加入脱墨化学品对浮选脱墨的影响，并对实验室浮选操作条件和脱墨化学品的匹配及其用量进行了探讨。结果表明：在碎浆时加入脱墨化学品对提高白度和脱墨效率很重要，在优化的碎浆和浮选条件下，MOW脱墨浆白度由未浮选的71．5％ISO提高到77．3％ISO，残余油墨量由未浮选的29．49mm^2/g浆减少到0．39mm^2/g浆，浆中灰分降低81．2％，纸浆的强度性能也得到改善。     

脱墨纸浆的漂白特性

本文采用H2O2及CIO2对两种常见的废纸脱墨纸浆进行漂白处理，从漂白后纸浆的白度及浆中荧光增白剂的含量等两个方面对其漂白效果进行对比。一、试验1．试验原料未试验采用了两种典型的废纸浮选脱墨纸浆A、B，其中脱墨纸浆A的成分为70％rpNP门idNewprint，废旧新闻纸）＋300kCGS（CoatingGradeSide，涂布白纸边），脱墨纸浆B为办公室废纸脱墨浆，两种脱墨浆均取自某造纸厂且未经过漂白处理。2．漂白试验为了便于对HZOZ与CIOZ漂白脱墨纸浆的效果进行比较，本试验采用了相同的漂白控制条件：70ap，浓度6．0％，时间90分钟。其中在＊…     

MOW回用处理过程纸浆中非纤维组分的去除特征研究

本研究模拟了混合办公废纸（MOW）的碱法制浆过程,探讨了在“碎浆-浮选-洗涤-漂白”回用处理各环节中,纸浆非纤维组分的去除特征。结果表明,在碎浆环节,灰分和淀粉的脱除率分别为71.5%和59.5%,此时油墨、溶解和胶体物质（DCS）和Ca²⁺的脱除率均较低,分别为29.4%、18.4%和28.8%。在浮选环节,油墨和Ca²⁺的脱除率分别提升53.5个百分点和31.2个百分点,而其他非纤维组分的去除效果一般。在洗涤环节,淀粉和DCS的去除特征明显,脱除率分别提升9.6个百分点和9.4个百分点;在漂白环节,纸浆中非纤维组分的去除效果受漂白条件的影响较小。综上所述,MOW经过回用处理,所得纸浆中油墨、灰分、淀粉和Ca²⁺的含量均明显降低,但仍在纸浆中有不同程度的保留。     

废纸碎解条件对油墨老化的旧报刊废纸脱墨效果的影响

采用二段碎浆的方式,得出了废纸碎解条件影响油墨已老化的旧报刊废纸脱墨效果的趋势,分析了造成这一趋势的原因.结果显示:碎浆浓度和时间是影响脱墨效果的最重要因素,脱墨剂及Na2SiO3次之.采用二段碎浆工艺,可使出纸墨点数＜250个/m2,白度＞56%SBD.     

废纸脱墨工艺

随着造纸工业的不断发展，造纸原料日趋紧张，污染愈加严重。废纸脱墨——作为纸浆来源的另一途径，越来越受到人们的重视。1废纸脱墨工艺脱里工艺取决于原料品种和成浆质量要求。根据本厂的实际情况，使成浆质量适应生产高档文化用纸的要求，研究出经济可行的脱墨工艺，以洗涤法除去已分离的油墨。1．1工艺流程试验过程中，我们选择了蒸煮及碎解相结合的脱墨方法。其主要流程是：药液白皮纸——蒸煮——机械碎解——筛选净化——漂白——成浆。1．2脱墨过程中化学药品及其它工艺参数对脱墨效果的影响1．2．1氢氧化。人氢氧化钠在脱墨过程中…     

溶解与胶体物质模型物对废纸脱墨和漂白的影响

为研究白水中溶解与胶体物质（DCS）对废纸浆脱墨和漂白的影响,选取了3种DCS模型物作实验,结果表明,3种DCS模型物对废纸脱墨浆和漂白浆的白度影响不大;此外,还研究了这3种模型物对不同的脱墨剂脱墨及漂白效果的影响：使用3号脱墨剂（主要成分是脂肪酸聚氧乙烯酯以及少量的阴离子表面活性剂）时,脱墨浆的白度较对照浆有了明显的提高;使用1号脱墨剂（脂肪醇聚氧乙烯醚与脂肪胺聚氧乙烯醚）和2号脱墨剂（脂肪酸钠）时,脱墨效果不明显,并且脱墨浆的白度有所降低。     

废纸浆过氧化氢漂白的生产实践

过氧化氢漂白废纸浆在生产中应用很少。笔者在四川某纸厂进行了过氧化氢漂白废纸浆的生产试验。该厂利用白纸边（夹杂少量带有油墨的废纸）和废书纸（经脱墨处理）为原料进行制浆，经过次氯酸钠传统漂白工艺，使用1092mm单网单缸纸机生产普通卷筒卫生纸。试验时只对漂白的方法、工艺进行了改动，过氧化氢漂白试验收到了很好的效果，并在生产上正式采用。1漂白工艺两种原浆（白纸边经碎解处理和废书刊经脱墨）的白度均为70％（ZBD）左右。两种浆分别单独在传统的间歇式漂洗机漂白，之后混合进行打浆、抄纸。漂白at艺条件：H刀。l％，Na0HI…     

进口废纸脱墨生产高级卫生纸

我国利用废纸脱墨生产高档纸的研究报道较少，利用进口废纸生产高级卫生纸的研究和实践将能填补广西废纸脱墨领域的空白。1实验材料与方法1．l原料进口书刊废纸和进口画报废纸，经分选，除去杂质和书钉，撕成小块放塑料袋内封口平衡水分后，测定水分备用。l·2浮选装置自行设计，有机玻璃制造。1．3试验方法l·3·且洗涤用so目的铜网进行洗涤。1．3．2碎浆将适量废纸和脱墨剂置于TF－125食物打散器中，控制设定的碎浆浓度后，于恒温水治中搅拌反应10～20min，然后进行浮选和洗涤。1．3．3抄片在布氏漏斗中抄成浆片后，压手风干测定白度；在…     

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