黏胶纤维在高透气度滤棒成型纸上的应用研究

研究了黏胶纤维替代部分针叶木浆生产高透气度滤棒成型纸的可行性,分析了黏胶纤维对滤棒成型纸透气度及抗张强度的影响。结果表明,在实验室条件下,针叶木浆打浆度22°SR,黏胶纤维用量40%,增强剂用量1%,滤棒成型纸手抄片可获得较高的透气度和抗张强度,透气度达到3000 CU,抗张指数达到50 N·m/g。     

一次性医用垫单纸的研制

分析了涤纶、天丝、黏胶纤维与针叶木浆配抄对医用垫单纸强度、透气量、柔软性及Cobb值的影响,研究了针叶木浆打浆度、涤纶纤维长度和用量、浸渍液种类及起皱处理对医用垫单纸性能的影响。结果表明,配比天丝纤维的纸张强度、柔软性较差,黏胶纤维纸张透气性较差,涤纶纤维更适用于医用垫单纸;10 mm涤纶纤维比5 mm涤纶纤维更利于纸张的强度、柔软性和透气性;针叶木浆打浆度的增加有利于纸张强度而不利于透气性和柔软性,20°SR较为适宜;涤纶纤维用量20%时纸张的强度较高、匀度好且柔软透气;不同乳液(R1、R2、R3)浸渍后,纸张强度R3>R1>R2,抗水性R1>R3>R2,起皱后强度R3>>R1>R2,R1和R3以1∶1比例混合浸渍,可制得与进口医用垫单纸产品性能相当、抗水阻隔性好且起皱后强度性能优良的医用垫单纸。     

丝光浆对空气滤纸原纸性能的影响

在室温条件下,对漂白硫酸盐针叶木浆进行丝光化处理,探讨了碱液浓度和处理时间对纸浆聚合度的影响;并进一步研究了丝光浆与针叶木浆的配比、针叶木浆的打浆度、增强剂种类和用量以及压榨和干燥方式对空气滤纸原纸性能的影响。结果表明,碱液浓度190 g/L、处理时间45 min时,获得的丝光浆具有较高的聚合度;另外,当丝光浆用量为50%、针叶木浆的打浆度为22°SR、阳离子聚丙烯酰胺用量为0.06%时,所抄空气滤纸原纸经压榨干燥后,其透气度高于100 μm/（Pa·s）,优于行业标准QB/T 4031—2010阻燃性汽车空气滤纸要求。     

针叶木浆打浆对成纸透气度的影响

对南方松针叶木浆进行不同程度的打浆,可以满足高透滤棒成形纸对透气度及抗张强度不同的要求。     

烟草薄片型卷烟纸的制备及性能研究

以烟梗为原料制取的化学机械浆(CMP)与少最木浆纤维配抄烟草薄片原纸,经烟草萃取液涂布后制备烟草薄片型卷烟纸,并检测其相关物理性能和感官品质.根据烟草薄片型卷烟纸对抗张强度、透气度等物理指标的要求,通过优化打浆工艺,确定其最佳打浆度为:烟梗化机浆35°SR;未漂针叶本浆80°SR;漂白阔叶木浆40°SR;漂白麻浆70°SR;烟梗化机浆、未漂针叶木浆、漂白阔叶木浆、漂白麻浆的最佳配比为:75∶20∶2.5∶2.5,在此条件下,其抗张指数、透气度和伸长率分别为39.7 N·m/g,10.21μm/(Pa·s)和1.41％;经评吸实验感官评价,与普通雪茄烟纸相比,烟草薄片型卷烟纸的木质杂气减少,刺激性降低,品质得到提升.     

用枣椰树叶轴微细纤维素和氧化微细纤维素来改善纸张性能

通过木聚糖酶预处理以及轻微磨浆处理,漂白枣椰树叶轴浆用来分离制备微细纤维素(MFC)和四甲基哌啶氧化微细纤维素(TMFC)。分离后的MFC和TMFC用来改善未打浆针叶木浆和甘蔗渣浆抄造的纸张的强度性能,添加比例从2.5%增加到20%,并且对MFC的留着也进行了估测。结果显示,MFC和TMFC的添加能够提高未打浆针叶木浆和甘蔗渣浆抄造的纸张的紧度、干湿抗张强度、撕裂强度以及降低纸张的透气度。但是,在改善针叶木浆纸张强度性能方面,通常的打浆操作比添加微细纤维素更加有效。另一方面,在改善甘蔗渣浆纸张强度性能方面,添加MFC和TMFC比通常的打浆操作更加有效。并且,在针叶木浆中或者甘蔗渣浆中添加TMFC对抗张强度(干强度和湿强度)的改善比添加MFC效果更好。     

高透气度成型纸对滤棒成型加工与测量的影响

通过高透气度成型纸抗张强度、伸长率、定量、透气度等技术指标的变化,研究高透气度成型纸对滤棒成型加工的影响;研究ＬＪＹ－２Ｂ、ＦＴ３００两种滤棒吸阻测量仪及光电法、拉带法、气动法３种滤棒圆周测量方法对高透成型纸滤棒的测量影响。结果表明：（１）高透气度成型纸纵向抗张强度过低,成型时易断纸;纵向抗张强度过高,影响刀片切割,不利于自动断纸、换纸;纵向抗张强度波动大,盘纸在运行时,强度最小部位易断纸;横向抗张强度过低,抗膨胀能力较差;横向伸长率过高,当丝束总旦数增加时,受丝束向外压力易使滤棒膨胀、变形,造成圆度不匀;定量过低、纸张较薄、挺度不够,成型时易透胶、漏胶,影响烟枪清洁;定量过高,成型纸成本增加。（２）高透气度成型纸随透气度增加,滤棒通风透气性增大,不宜采用不完全密封法测量滤棒吸阻,也不宜使用气动法测量滤棒圆周,否则将增大测量误差。     

打浆方式对生活用纸未起皱原纸性能的影响

采用了针叶浆、阔叶浆分别打浆和混合打浆的打浆方式,将分别打浆情况下制备的不同打浆度的针、阔浆料混合至相同的打浆度21°SR,得到不同组合的浆料,然后与针、阔混合打浆至21°SR的浆料对比,研究了不同打浆方式下浆料的湿部化学及抄纸后纸张的强度、吸水性、柔软度、掉毛量的变化。研究结果表明不同打浆方式下,浆料的pH、Zeta电位及电导率未发生明显变化;采用针、阔分别打浆的打浆方式,针叶木浆打浆度为24°SR、阔叶木浆打浆度为20°SR时,纸张强度最高,达到43.36N.m/g,且掉毛量最少,仅16.20%,吸水性和柔软度适中;针叶木浆打浆度为31°SR、阔叶木浆未打浆的情况下,纸张吸水性和柔软度较好,达到21.0mm、153m N,但强度较差且掉毛量较多。采用针、阔混合打浆的打浆方式,纸张强度略低,为42.07N.m/g,掉毛量稍多,为18.54%,但吸水性和柔软度较差。     

汉麻芯秆烧碱-蒽醌碱法制浆性能研究

利用烧碱-蒽醌碱法制浆工艺对育种田汉麻芯秆和纤维田汉麻芯秆进行蒸煮,研究用碱量对二者成浆性能的影响。结果表明,当蒸煮温度160 ℃、保温时间2.5 h时,随着用碱量的增加,2种浆料的粗浆得率和高锰酸钾值逐渐下降,纤维素含量和保水值逐渐提高;当用碱量为20%时,育种田汉麻芯秆浆和纤维田汉麻芯秆浆的粗浆得率分别为48.3%和56.8%,高锰酸钾值分别为11.0和13.9,纸浆得率和性能相对较优。将打浆度均为40 °SR的这2种汉麻芯秆浆（纤维长度约1~3 mm）分别与针叶木浆（打浆度40 °SR）按一定配比混合抄纸发现,配抄5%汉麻芯秆浆可改善纸张的强度性能,表明汉麻芯秆浆可作为生产箱纸板面层纸或牛皮纸等的替代原料。     

液晶玻璃间隔纸抄造工艺的研究

透气度是液晶玻璃间隔纸重要的指标,湿纸幅强度与成纸透气度性能之间相互矛盾,对液晶玻璃间隔纸的抄造带来影响,为了在不损失液晶玻璃间隔纸所需湿纸幅强度的同时改善其成纸透气度,本课题研究了纤维种类、打浆度及解键剂用量对液晶玻璃间隔纸湿纸幅强度和成纸透气度的影响。结果表明,解键剂与打浆的协同作用可有效提高液晶玻璃间隔纸的湿纸幅强度并保证其成纸透气度;将针叶木浆(32°SR)、阔叶木浆(22°SR)按20∶80配比混合,然后添加0.50%的解键剂抄造的液晶玻璃间隔纸,其湿纸幅强度为0.83 kN/m,成纸透气度为162.6 μm/Pa·s,可满足液晶玻璃间隔纸对湿纸幅强度及成纸透气度的要求。     

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