几种阔叶木浆在卷烟纸生产中的应用研究

为分析不同种类阔叶木浆纤维形态的特点和对卷烟纸物理指标的影响,本研究对11种阔叶木浆（7种桉木浆,3种桦木浆,1种杨木浆）进行纤维形态观察和测量、抄纸以及生产验证。结果表明,纤维的长宽比、湿重、打浆度以及纸张紧度对卷烟纸透气性影响较大;杨木浆卷烟纸的罗纹强度最好（为23.5%）,桦木浆次之、桉木浆最差;杨木浆适用于生产高定量、高透气度卷烟纸,南美1号桉木浆、南欧桉木浆、南美2号桉木浆适用于生产低定量、高透气度或高定量、高透气度卷烟纸;南美3号桉木浆和云南桉木浆适用于生产低定量、低透气度卷烟纸;11种阔叶木浆均可生产高定量、低透气度卷烟纸。     

影响卷烟纸透气度的因素及其控制

降低香烟中焦油的含量，是卷烟厂目前研究的重要课题之一。提高卷烟纸的透气度，会减少抽吸香烟时有害物质的摄取量，卷烟纸在“降焦工程”中起着重要作用。因此，卷烟纸的透气度也就成了划分卷烟纸等级的重要指标之一。1.1纤纤维原料随着国内用的纤维原料有针叶木浆、阔叶木浆、麻浆和草浆（主要是龙须草），而各大卷烟纸厂选用的主要是针、阔叶木浆。由于卷烟纸定量小（26.5±1g/m2）,在选定生产原料时，要重点考虑：（1）保证成纸强度；（2）透气性；（3）不透明度要高。因此，在选择针叶木浆时，就要尽量选择一级一类木浆，其浆料经通常…     

打浆对卷烟纸透气度的影响

目前国内生产的卷烟纸一般透气度偏低,这与卷烟纸生产工艺和设备落后有一定关系,还与原料种类、配比和打浆抄纸操作不当有关,下面仅就打浆对卷烟纸透气度的影响谈谈自己的看法。     

高透气度卷烟纸的生产实践

吸烟危害健康已被世人公认，为降低香烟的焦油含量，采用高透气度卷烟纸是最有效方法之一。我厂在高透气度卷烟纸的生产方面曾经做过大量的工作。1原料特征在选择高透气度卷烟纸原料结构的过程中，我们对多种纤维原料的纤维形态特征及其成纸性能进行过大量的分析试验，最后确定，以亚麻为主要原料生产高透气度卷烟纸。亚麻纤维强韧柔软，具有较好的色泽，纤维平均长度为18mm左右，纤维长宽比高达1100左右。纤维外壁平滑无脏衣，胞壁厚，胸腔极小，管壁上有极稀少的纹孔和明显的横节纹。结晶度为75（X射线衍射法测定），微胞取向度较高，胶…     

废弃纺织品纤维与木浆配抄纸的性能

为探讨废弃纺织品作为原料在现代造纸工业中的应用,按照原料和颜色深浅把废弃纺织品分为4类:合成纤维(浅色)、纤维素纤维(浅色)、纤维素纤维(深色)、纯棉纤维(浅色),将原料经粉碎工序加工成散纤维,分别与木浆配抄成手抄纸,分析了配抄纸的各项物理性能。结果表明,手抄纸具有优异的透气性能,透气度为91.70~100.00μm/(Pa·s),是木浆(对比样)手抄纸的9.6~10.44倍;力学性能低于木浆手抄纸,是木浆手抄纸的27.8%~55.6%;废弃纺织纤维与木浆配抄纸的白度与纺织品纤维原来的颜色相关。     

阔叶木浆打浆度及其配比对卷烟纸不透明度和透气度的影响

在不加填料的情况下,本实验通过变化阔叶木浆的打浆度、阔叶木浆与针叶木浆的配比,研究阔叶木浆的打浆度以及与针叶木浆的配比对卷烟纸不透明度和透气度的影响。结果表明:阔叶木浆的打浆度和配比对卷烟纸的透气度影响很大,对不透明度影响不大。     

多段打浆法制备涤纶超短纤维基纸袋纸及其性能研究

以中浓、低浓打浆相结合的多段打浆工艺为基础,采用涤纶超短纤维与针叶木浆混抄方法,制备高透气度纸袋纸。结果表明,针叶木浆采用中浓（浆料浓度10%,打浆至18 oSR）+低浓（浆料浓度6%,打浆至20 oSR）两段打浆的方法,所抄纸张各项物理强度性能较佳且透气度可达11.23μm/(Pa·s)。随着涤纶超短纤维添加量的提高,纸袋纸的孔隙率与透气度随之提高。当涤纶超短纤维添加量为5%～10%时,纸袋纸透气度可达28.13～47.48μm/(Pa·s),各项物理强度性能均能满足使用要求。     

提高传统纸机抄造卷烟纸质量的工艺途径

传统抄纸机生产的卷烟纸，其透气度、不透明度以及匀度等，越来越不能满足用户需要。我厂通过传统纸机的改进调整以及使用助剂，对提高卷烟纸的质量取得了一定效果。现谈谈我们的体会与认识。1现代卷烟纸的质量要求现代卷烟纸，或者说中、高档卷烟纸，其质量主要要求为：①纸页组织均匀。②具有适宜的透气度。中透气度为5．3～8．SPin／Pa·s，相当于32～51科雷单位；高透气度为8．SPm／Pa·s以上。③具有较高的强度和不透明度。④罗纹规则清晰，正反差小；⑤纸质手感柔软、松厚，表面平滑、细腻等。2现代卷烟纸生产的H艺和特点现代卷烟…     

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.     

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.     

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.