防粘纸离型性能研究

本研究通过比较以3种不同有机硅树脂为防粘剂的防粘纸离型性能,从中优选出水性有机硅树脂作为后续混合正交实验的防粘剂,重点探讨了底涂主剂类型、底涂压光条件、防粘层涂布量和防粘层配比对防粘纸离型性能的影响.结果表明,以不同配比水性有机硅树脂为防粘剂制备的防粘纸,剥离强度范围为0.3 ～ 1.9N/15mm;在探讨的4个影响因素中,防粘层配比对离型性能的影响最大.     

结合力牢固的雾面离型纸

正离型纸由于淋膜层平整度高,离型剂涂层与淋膜层之间附着力差,当离型纸与涂覆有高黏度黏合剂的贴膜贴附时,容易导致离型纸上的离型剂涂层被黏附力更大的黏合剂带走,从而在贴膜的局部表面形成难以清理掉的离型剂涂层区域,破坏了贴膜整体的纯净、一致性。在此,提供一种雾面离型纸,目的是解决离型纸的淋膜层与离型剂涂层结合力不高的问题。如图1所示,该种雾面离型纸包括淋膜层、离型纸原纸层、胶黏剂层、薄膜层、雾面涂层和离型剂涂层,     

皮革离型纸离型层技术

皮革离型纸离型层技术的发展大致经历了四种技术：直接硅酮涂布、底涂加离型层涂布、热塑性树脂涂布及新型技术。其中新型技术包括基于辐射固化离型层的技术和基于铸涂法的生产技术。直接硅酮涂布已经被淘汰;底涂加离型层涂布和热塑性树脂涂布应用广泛。     

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。     

流变助剂对涂料流变性能的影响

研究了CMC对涂布白纸板底涂涂料表观黏度的影响,CMC能保持涂料良好的流动性能和保水性能;而在涂布白纸板画涂涂料中,与CMC相比,加入丙烯酸碱润胀乳液(L255)后,涂料体系的中低剪切速率(10-1000 s-1)表舰黏度增加明显,而在高剪切速率下(大于1000 a-1),随剪切速率增加,涂料表观黏度剪切稀化现象更显著.     

CCK离型纸产品质量控制研究

针对CCK离型纸进行了研究,探讨了原纸质量、涂布工艺等对产品质量的影响。结果显示,CCK离型纸生产过程的原纸浆料打浆度、灰分含量、表面吸水性等对CCK离型纸的吸油值、离型力等具有较为明显的影响,为了得到性能良好的离型纸,浆料打浆度应不低于45°SR,灰分含量不高于2%,表面吸水性不高于30 g·m~(-2)。瓷土涂布层对离型纸产品质量同样具有明显的影响,为了得到性能良好的CCK离型纸,涂料中胶乳含量应不低于44份,涂布量不小于6.0 g·m~(-2)。     

重修鞋面革涂饰工艺技术的研究

开发了C级革坯制作重修鞋面革生产工艺,试验结果表明,通过优化涂饰剂材料如采用高效渗透剂和自交联丙烯酸,提高了成品革的耐剥离强度。通过优化涂层中涂饰剂的材料配比和涂饰量,提高了成品革的耐曲折次数。通过优选聚碳型聚氨酯顶层光油,提高了成品革的耐磨性能。通过优化的辊涂工艺技术提高了生产效率,降低了生产成本。     

济南大易造纸有限公司——研制开发出新产品——离型纸

济南大易造纸有限公司根据市场需求变化,近期成功的研制开发出了一种新型纸——离型纸。这种纸可分为硅系列离型纸和非硅系列离型纸,是主要用于生产聚氨酯(PU)和聚氯乙烯(PVC)人造革的工业用纸。离型纸生产人造革是在离型层表面涂布粗状树脂,经发泡工艺处理、烘干、交联、固化定型,然后将离型纸剥     

PVA水性压敏胶带离型剂的制备与性能研究

研究适合水溶PVA压敏胶带的离型剂。通过制备不同浓度的OP10、Span80、OP10和Span80混合溶液的离型剂,并将其涂布于PVA水性压敏胶带的非粘面,测试其表面张力的降低和180°剥离强度。试验结果表明,三种离型剂均可降低PVA水性压敏胶带的表面张力,但其180°剥离强度不同,Span80涂布于PVA胶带,剥离强度较低;而OP10、OP10和Span80混合的离型剂剥离强度的效果较好,当OP10的浓度大于10%时,其剥离强度大于1.65N/cm,满足胶带的使用要求,当浓度低于10%,其剥离强度不符合胶带要求;当OP10的浓度为10%,Span80的浓度为15%时,其剥离强度为2.2N/cm,符合国家标准。     

以丙烯酸为功能性单体的苯丙乳液聚合及其性能研究

以苯乙烯与丙烯酸丁酯为共聚单体,丙烯酸为功能性单体,通过半连续种子乳液聚合制备稳定的苯丙乳液。研究表明:当Na HCO3质量配比在0.19%~0.3%时,乳液稳定性好;当丙烯酸质量配比小于2.0时,乳液粒径分布窄,平均粒径为0.18μm,乳液流动性较好,高于2.5时,乳液粒径变大且分布变宽,乳液呈膏状、流动性差;当丙烯酸质量配比增大时,乳液黏度呈逐渐上升趋势;随着氨水质量配比的增加,乳液黏度逐渐增大,但达到一定量后保持不变;随剪切速率增大,乳液呈明显的剪切变稀趋势,说明乳液为假塑性流体。     

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