尾巨桉KP-AQ制浆及漂白特性的研究

对我国现有的尾巨桉的纤维形态、化学组成进行了分析,并对尾巨桉硫酸盐法制浆、漂白及其抄纸性能进行了研究。通过正交实验分析得出,尾巨桉KP-AQ制浆较佳的蒸煮工艺条件为:用碱量15%-17%,硫化度20%-22%;升温时间100-110m in,保温时间90-110m in,最高蒸煮温度165-170℃;蒽醌用量0.1%,液比1∶5.5。采用D1EpD2短程序漂白,尾巨桉KP-AQ浆的最终白度达到89.5%,黏度比漂前下降91.0 mL/g。打浆度在46.0°SR左右时,尾巨桉KP-AQ浆各项物理性能指标较好,抗张指数79.5N.m/g,撕裂指数21.90mN.m2/g,耐折度709次,紧度0.55g/cm3。     

烟梗制浆漂白和配抄工艺的研究

采用仿生物酶体系对烟梗原料预处理,然后进行化学机械法制浆,同时对烟梗浆的漂白和配抄工艺进行研究。结果表明,在H2O2用量8%,处理温度70℃,处理时间90 min的漂白条件下获得的烟梗基片的白度性能较佳;在H2O2用量8%,处理温度80℃,处理时间120 min的漂白条件下获得的烟梗基片的强度性能较佳;该条件下获得的漂白烟梗浆配抄新型雪茄烟纸,最佳配比为烟梗浆∶外加纤维(本色针叶木浆∶漂白阔叶木浆∶漂白麻浆=8∶1∶1)=80∶20,此时抗张强度为1.09kN/m,透气度为9.05μm/(Pa.s),伸长率为1.42%,满足雪茄烟纸的物理指标要求。     

精制牛皮纸的生产及常见问题的处理

１生产工艺精制牛皮纸的生产，采用普通硫酸盐法落叶松木浆为原料，蒸煮后浆料卡伯值４５～５５，然后经洗涤、筛选、漂白、打浆、施胶、除渣、上网抄纸。其漂白工艺是采用次氯酸盐对纸浆进行处理。浆浓３．５％，温度３０～４０℃，漂白时间３～３．５h，白度３５％～４０％。筛选在漂白前进行，采用CX筛进行一级二段筛选，筛渣送蒸煮锅回煮。工艺流程如下：２打浆及抄纸浆料需经打浆工艺处理，漂白后的纸浆采用Ф４５０双盘磨打浆，打浆浓度３．０％～３．５％，打浆度控制在２８～３２°SR。纸浆经施胶调浆后，送入６００锥型除砂器，…     

桉木浆蔗渣浆混合漂白与抄纸的研究

广西使用桉木的造纸厂家极少，以蔗渣为原料的造纸厂如使用部分桉木片为原料，则需对漂白和打浆系统作相应的调整。但是，如果能将桉木浆与蔗渣浆混合漂白与打浆后抄纸，则可采用原有的蔗渣浆漂白与打浆流程。对此，我们进行了实验室小试和中试的研究，以期能促进桉木制浆。1试验方法：1．1原材料尾叶桉木片由广西南宁郊区林业局提供，甘蔗渣由广西南宁糖纸厂提供。1．2蒸煮分别桉按木片和甘蔗渣进行蒸煮，按木浆的KMnO4值为13.8，蔗渣浆的KMnO4值为13．4。1．3漂白将KMnO4值相近的桉木浆和蔗渣浆分别以不同比例和漂白条件在聚乙烯塑料…     

桉木化学浆造纸性能的研究

研究了刚果１２号桉与尾叶桉漂白硫酸盐浆的打浆造纸特性。试验表明，两种桉木浆的抗张强度与耐破度高于美国阔叶木浆，刚－１２桉木浆双高于尾叶桉。刚－１２桉的打浆性能稍差于尾叶桉，较高浓度打浆有利于改善刚－１２桉的打浆性能与强度性质。用漂白麦草浆或漂白针叶木浆与刚－１２桉或尾叶桉木浆配抄，裂断长产生协同效应。     

桉木制浆方法及其纸浆特性的比较

本文对桉木制化学浆及化机浆的几种制浆方法及其纸浆特性进行了比较。结果表明,在硫酸盐法蒸煮的基础上,用亚硫酸钠代替部分Na_2S及NaOH,或用碱性亚硫酸钠——AQ法蒸煮桉木,可使纸浆得率提高2—3％,浆的KMnO_4值下降,纸浆的强度保持相同水平,桉木碱性亚钠化学浆与蔗渣CMP配抄,可以提高纸的强度和不透明度。桉木硫酸盐浆经C/D—E_0—D短序漂白,白度达90％ISO。桉木碱性亚钠预处理化机浆的强度与蔗渣CMP相当,但纸的不透明度高,在预处理时添加甲醛,有提高浆的得率、白度和强度的效果。对碱性过氧化氢预处理桉木化机浆的研究表明,预处理浆的白度达72％ISO,用少量H_2O_2漂白,浆的白度提高到78％ISO以上,APMP生产流程简单,废液BOD_5及COD含量低,能耗比CMP低。     

桉木硫酸盐浆DQP和(DQ)P漂白的研究

对卡伯值为17.1的桉木速生材硫酸盐浆进行DQP和(DQ)P漂白。结果表明,在有效氯用量为4.0%、H2O2用量为2.5%时,DQP漂白浆白度达到85.4%,(DQ)P漂白浆白度达到85.3%;且(DQ)段的pH值在2～4之间变化对纸浆的白度影响不大。两种漂白浆的强度都很好,在相同打浆度下DQP漂白浆有更高的裂断长和耐破指数;而(DQ)P漂白浆则具有更高的撕裂指数,并且所需要的打浆能耗也较少。     

杨木硝酸法制浆性能研究

以硝酸水溶液为蒸煮药剂,在常压下对小黑杨进行制浆性能的研究;探讨了最高蒸煮温度、硝酸浓度、蒸煮时间和液比对纸浆性能的影响,并对纸浆进行了可漂性研究。结果显示,在最高蒸煮温度为85℃、硝酸浓度为10%、液比为1∶10的条件下蒸煮268 min后,纸浆的得率可达58.6%,高锰酸钾值为4～8;分别采用NaClO和H2O2进行单段漂的漂后浆白度均低于NaOH联合漂剂漂白的漂后浆,在NaClO漂白3 h时,NaOH NaClO漂白浆白度可达84.6%,漂白效果最佳。     

黄麻制备茶叶泡袋纸及其应用研究

以黄麻为原料,采用硫酸盐法制浆,对所得浆料进行了二氧化氯漂白和打浆处理,并抄造纸片。探讨了二氧化氯用量、浆料所处的p H环境和漂白温度对纸浆白度的影响,以及打浆度对纸浆各性能的影响。结果表明:在二氧化氯用量为6%、纸浆所处p H=2、漂白温度为80℃的条件下,纸浆白度最高,为73.20%ISO;根据纸浆的综合性能,确定了55°SR为最佳打浆度。最后对制备的茶叶泡袋纸进行了初步的应用实验。     

柠檬桉、尾叶桉、柳桉制浆性能研究

对柠檬桉、尾叶桉、柳桉3种速生桉木原料硫酸盐浆的制浆和漂白性能进行了研究，研究结果表明，3种桉木原料均具有优良的制浆和漂白性能。其较佳的蒸煮工艺条件为：用碱量(Na2O计)：柠檬桉14％～16％，尾叶桉14％，柳桉12％，硫化度25％，最高蒸煮温度165～170℃，液比1：5，保温时间90～120min。采用DEpP短程序漂白，3种原料漂白浆的白度可达到85％ISO以上，且漂白浆的物理性能较好。     

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