滤纸微纳结构对品质因子的影响

本研究制备了以亚微米级玻璃棉为主体的微纳结构滤纸,探究了不同粒径过滤颗粒对滤纸过滤性能的影响。结果表明,粗纤维（平均直径0.69 μm）滤纸在特定粒径过滤颗粒下表现出优于细纤维（平均直径0.24 μm）滤纸的过滤性能。当过滤颗粒粒径≤100 nm时,粗纤维滤纸对80 nm和100 nm颗粒过滤的品质因子最大,过滤性能更好;当过滤颗粒粒径>100 nm时,滤纸对150、200和300 nm颗粒过滤的品质因子接近,此时粗纤维和细纤维滤纸的过滤性能接近。     

串珠纤维对静电纺纤维复合滤纸结构和性能的影响

本研究制备了静电纺串珠纤维复合滤纸和静电纺纳米纤维复合滤纸,对其微观形貌和孔径等结构特性以及过滤阻力、过滤效率和容尘量等过滤性能进行了分析。结果表明,静电纺串珠纤维复合滤纸和静电纺纳米纤维复合滤纸的纺丝层纤维平均直径接近,分别为225、250 nm。通过控制纺丝时间使二者的初始过滤阻力相近时,静电纺串珠纤维复合滤纸过滤效率为73.1%,静电纺纳米纤维复合滤纸过滤效率为38.2%。相同测试条件下,静电纺串珠纤维复合滤纸阻力上升速度比静电纺纳米纤维复合滤纸慢,达到相同终止阻力时,静电纺串珠纤维复合滤纸的作用时间更长、容尘量更大,二者的容尘量分别为119.29、96.23 g/m~2;并采用仿真模拟软件GeoDict建立模型,探究了两者阻力变化情况和容尘量的差异。     

两种超细纤维复合空气过滤纸的结构与性能研究

由于超细纤维可以显著提高过滤效率,在过滤材料中的应用得到越来越多的重视,但不同方法制备的超细纤维复合空气过滤材料在性能上存在着较大差异。本文主要对静电纺复合和造纸湿法复合这两种不同方法制备的超细纤维复合空气过滤纸进行结构与性能的研究。结果表明,两种不同方法制备的超细纤维复合空气过滤纸的初始过滤效率非常接近,静电纺复合滤纸的透气度为243mm/s,比造纸湿法复合滤纸的高近1倍;静电纺复合滤纸的容尘量为82g/m~2,造纸湿法复合滤纸的容尘量比其高14g/m~2;经过10次反吹清灰循环,静电纺复合滤纸的粉尘剥离率由91.6%降低为71.9%,造纸湿法复合滤纸的由67.4%降为38.8%,静电纺复合滤纸的反吹清灰性能比造纸湿法复合滤纸的更优异。     

玻璃棉分散时间对滤纸结构和过滤性能的影响

分散时间是影响纤维长度的主要因素,利用悬浮液粘度表示纤维长度的变化。品质因子是评价滤纸优劣的关键指标,品质因子越高,滤纸过滤性能越好。通过对玻璃棉分散不同的时间,制备不同长度的玻璃棉滤纸并对其进行透气度、孔隙率、厚度、过滤效率和品质因子等性能的研究。结果表明:随着纤维分散时间从60 s增加到300 s,悬浮液粘度下降70%,说明纤维长度显著减小;在纤维配方和抄造工艺条件相同时,纤维长度与厚度、孔隙率成正比,纤维长度对滤纸透气度的影响较小;在80～300 nm过滤颗粒下,纤维长度变化对滤纸品质因子的影响较小,最大变化幅度5.9%,由此可见,纤维分散时间引起的纤维长度的变化对滤纸过滤性能的影响较小。     

玻璃纤维空气滤纸的制备及性能

研究玻璃纤维的处理和玻璃纤维滤纸的制备工艺,以期获得良好的过滤性能和高强度的空气滤纸。通过纤维悬浮液图像、沉降时间和性能检测等探讨了玻璃纤维在不同pH值溶液中的分散情况和对应纸样的物理性能,同时分析了不同纤维配比、木浆打浆度和增强剂对玻璃纤维滤纸性能的影响。结果表明:pH 3.5时玻璃纤维分散效果最好,纸样多次检测数据最稳定;但pH 3.0时,纸页的强度和过滤性能最佳;25%玻纤含量和40°SR木浆打浆度能较好兼顾纸页的强度指标和过滤性能;分子量900万的CPAM对滤纸的增强效果最好。     

植物纤维对玻璃纤维滤纸增强效果的研究

将植物纤维加入由短切玻璃纤维和微细玻璃棉组成的玻璃纤维中,通过分散、成形、浸胶、干燥等工艺制备了植物纤维增强的玻璃纤维滤纸;探究了植物纤维类型、纤维占比、纤维打浆度对滤纸抗张强度、过滤性能及匀度的影响。结果表明,植物纤维的添加可有效提高玻璃纤维滤纸的抗张强度,但对其过滤性能和匀度会产生不利影响;制备植物纤维增强的玻璃纤维滤纸的最优工艺条件为：阔叶木纤维占比5%、打浆度为40 °SR,在此条件下,玻璃纤维滤纸的抗张指数较空白样提高了25.3%,品质因子也可维持在0.0220 Pa^-1的较高水平。     

棉短绒浆、阔叶木浆及合成纤维配抄汽车滤纸

纤维原料直接影响滤纸的孔径、微米级过滤效率、孔隙率及纸机运行时湿纸幅的强度。对棉短绒浆、阔叶木浆及合成纤维配抄生产各种类型滤纸的可行性进行了研究。实验结果表明,棉短绒浆、阔叶木浆及合成纤维按不同配比配抄制备的6种滤纸的多项指标均超过或接近标准值,滤纸的过滤效率与标准值相当,个别指标低于标准值,但不影响其过滤性能。     

高精度油水分离燃油复合滤纸

正特种纸专业委员2017-04-19报道:会目前,通过优化滤纸纤维配方来提升滤纸性能的空间可能不多。除了继续吸收新的高性能纤维技术和湿法成型技术,滤纸性能的进一步提升需要着重对滤纸结构的设计。通过造纸技术和非织造布技术交叉结合制备的复合过滤材料,近年来在过滤与分离领域中的应用发展非常迅速。本文主要综述了非织造布/木浆纸复合过滤材料的研究进展,涉及的应用领域有重型车空气过滤、燃油过滤、反吹除尘、燃气轮机进     

影响滤纸结构性能和过滤性能的一些因素

介绍影响滤纸结构性能和过滤性能的一些因素，包括浆料、纤维的性质对滤纸结构性能的影响以及滤纸结构性能等因素对过滤性能的影响。     

三叶形粘胶纤维对过滤纸性能的影响

对两种纤度相同的三叶形粘胶纤维和普通粘胶纤维的形态和滤水性能进行了分析,并进一步就两种粘胶纤维的用量对过滤纸物理性能和过滤性能的影响进行研究.结果表明,粘胶纤维含量低于50％时,两种纤维对过滤纸平均孔径、透气度和耐破度的影响差别不大,但含三叶形粘胶纤维的纸张厚度比含普通粘胶纤维的要大.随着三叶形粘胶纤维含量的增加,滤纸的过滤阻力降低、纳污容量增大,但过滤精度有所下降;当粘胶纤维加入量为30％时,对于含三叶形粘胶纤维和含普通粘胶纤维的两种滤纸,二者的过滤精度无显著差异,前者的纳污容量是后者的1.28倍.     

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.     

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     

INFOPRINT 2014 was Successfully Held in Dongguan

Sponsored by Printing and Printing Equipment Industries Association of China （PEIAC） and organized by Print China magazine, the Seventeenth Beijing International Printing Information Conference （INFOPRINT 2014） was successfully held on 11th Dec. 2014 at Dongguan Exhibition International Hotel.