纤维衍生物（CMC）在造纸涂料中的应用

选用一种低粘度的CMC应用于涂布白板纸涂布试验时发现,涂料中添加CMC可大大提高涂料保水性能和控制涂料流变性。低剪切速率范围内（10^-1-10^2s^-1),含CMC的涂料为剪切稀化流体,粘度下降近一半以上,为了调节和控制涂料在流变性,CMC加入量应限制在0．5－1．0份／100份颜料为宜,且面涂比底涂用量稍低。此外,CMC在提高涂布白板纸光学性能、印刷性能等方面也起了很大的作用。     

灰底涂布白板纸涂料组分及其涂料制备

灰底涂布白板纸是由涂布层、面层、衬层、芯层和底层五层组成的结构,其涂料组分主要为研磨碳酸钙、高岭土、羧基丁苯胶乳、改性淀粉、分散剂、抗水剂、润滑剂、保水剂等。介绍了三次涂布灰底涂布白板纸的预涂、中涂、面涂涂料不同的颜料、胶粘剂配比、颜料的性能要求以及涂料制备工艺流程,并对涂料制备部分工艺和设备的要求作了说明。     

影响涂布白板纸质量因素分析

通过对涂布白板纸生产过程中使用的废纸原料、化学品、工艺过程、原纸质量和涂布涂料特性等因素分析与研究,提出了影响涂布白板纸质量的主要因素及解决方法。     

颜料涂布用胶乳

合成橡胶胶乳在纸张方面的用途很广。特别是在铜板纸、涂布纸,涂布白板纸及轻量涂布纸等的颜料涂布方面,使用量非常大(见表1)。颜料涂布既是为了改进纸张的外表,即纸张的平滑性、自度、不透明度等,同时,也是为了提高纸张适合印刷的各种性能,如油墨吸收性、油墨固着性、印刷光泽度、抗掉毛性等。 最近在涂布主要原料的供应方面,根据价格的变化、涂料调制的省力化及涂布纸性能的多种多样的要     

涂布白板纸印刷与模压中的故障排除(上)

一、认识涂布白板纸 1.何为涂布白板纸 涂布白板纸属于包装纸板的范畴,它是在原纸板上涂布白色涂料后,经整饰加工制成的加工纸板,其定量一般在200g/m2以上,厚度在O.1mm以上.主要用于单面彩色印刷后制作包装盒.     

颜料涂布对再生箱纸板性能的影响

研究了GCC、高岭土及其混合颜料对涂布再生箱纸板光学性能、油墨吸收性和机械强度的影响,并在此基础上优化了涂料配方。研究结果表明：涂布箱纸板的白度不仅依赖于颜料自身的白度,而且取决于颜料的遮盖性能。在一次涂布中,高岭土和GCC的混合比例为60：40时,涂布箱纸板的白度最高。预涂及面涂涂料中GCC含量增加均可提高二次涂布箱纸板的油墨吸收性。在涂料中加入OBA可显著提高涂布箱纸板的白度。另外,经涂布加工后,箱纸板的横向耐折次数及横向环压指数均有所增加。     

颜料的性能对涂布加工纸质量的影响

颜料的种类和性质对涂布纸的物理性能、光学及印刷性能有着重大的影响,所以生产涂布加工纸时涂料配方中颜料的选择是非常重要的.     

塑料颜料应用于造纸涂料的优点

在造纸涂料中 ,应用空心塑料颜料可提高涂料的固含量 ,对涂布机的操作及涂布纸的不透明度和光泽度是有利的     

提高涂布白板纸油墨吸收性的技术措施

现代印刷工艺的发展对涂布白板纸的油墨吸收性提出了更高的要求.从涂布化工原料、涂料配比、生产工艺、原纸和成纸质量控制方面对提高涂布白板纸的油墨吸收性的技术措施进行了探讨.     

钛白粉在造纸工业中的应用

钛白粉具有良好的光学特性、易分散性、耐老化性和化学稳定性,广泛应用于涂料、造纸、塑料、油墨和化纤等行业。该文主要介绍了钛白粉及其功能化产品的优异性能以及作为造纸填料、涂布颜料及功能性材料在造纸行业中的广泛应用,并就它的未来发展趋势进行了探讨。     

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