原纸质量对纸张涂布加工性能的影响

介绍了反映涂布原纸主要质量指标,如全幅分布、原纸强度、平滑度、透气度等指标,并着重探讨了这些质量指标对涂布加工性能的影响.从文中可知,原纸全幅分布包括定量、水分和厚度的分布,分布的均一性的影响表现在涂布吸料、干燥和运行方面;原纸强度包括表面强度、抗张强度和撕裂强度,对涂布加工的影响表现在涂布和印刷适性方面;原纸平滑度、透气度和不透明度对涂布纸的影响主要表现在印刷性能.     

高档涂布白卡纸项目

高档涂布白卡纸,技术含量高,是一种高档的纤维性材料--纸板,用于产品包装行业,可以大大提高商品包装质量,增值效果显著,用于出口商品的包装,其经济效益更加明显.因此,在烟草、医药、食品、化妆品、服装、生活用品及印刷装璜等方面广为使用.高档涂布白卡纸具有:松厚度高、挺度高的特点,制成的包装品具有优良的成型性和折叠性能;成纸匀度好,涂层均匀,纸张表面平整,印刷着墨均一,印刷层次清晰,可获得理想的印刷效果.高档涂布白卡纸的主要生产技术:面、底层采用漂白化学木浆,芯层采用BCTMP浆,纸张正面经二道刮刀涂布,运用CS、DCS进行控制.     

高档白卡纸板表面施胶技术的改进

山东某白卡纸板机主要生产高档涂布白卡纸（FBB）、烟卡和高档SBS涂布白卡纸三类高档白卡纸板,因产品用途和印刷方式不同,因此对表面施胶的要求也有差异。表面施胶不但能提高原纸抗拒流体渗透的性能,而且能提高原纸的表面强度、     

典型涂料抗水剂对涂布白卡纸性能的影响研究

涂布白卡纸对表层防水耐湿和印刷性能要求较高。本文对比探究了PA PU、碳酸锆盐和改性乙二醛类这三种典型涂料抗水剂对白卡纸用涂料黏度、涂布后纸张的湿拉毛与湿排斥等防水耐湿性能,以及平滑度、表面强度、油墨吸收性等印刷性能的影响,结果显示添加较高份数的PAPU综合性能相对最优。     

涂布纸板印刷表面性能测试与胶印性能分析

涂布纸板是高档包装印刷的重要承印材料,广泛用于烟盒、药品、化妆品、食品、液态奶等的包装。涂布纸板有涂布白卡纸、涂布白纸板、涂布箱纸板等,其中在高档包装印刷中用的最多的是涂布白卡纸和涂布白纸板。涂布白卡纸通常面层为原木浆,底层以漂白木浆为主,中间层加其他木浆,经单面或双面涂布、压光整饰而制成的坚挺厚实的纸板。     

纸板胶印中剥纸皮故障的预防

为了让商品的外包装获得比较好的印刷效果,包装胶印中常采用单面或双面涂布的纸板进行印刷。常用的纸板有单面涂布白纸板、单面涂布白卡纸、玻璃卡纸等。涂布印刷纸板的实质是由原纸纸基和涂料层构成的多层结构,纸基还可以看成是由分层纤维堆积而成。当纸板表面受到较大的摩擦力作用时,表面的局部纤维可能从纸基上剥离下来,     

UV上光应注意的一些问题

UV上光不仅能弥补用UV油墨印刷的金银卡纸等印品表面粗糙、光泽度差、耐磨性差等缺欠,还可使普通承印物(如白卡纸、铜版纸等)印刷后表面更加平整,更加光亮.     

涂布箱纸板的光学性能与印刷适性

研究了重质碳酸钙(GCC)、高岭土及它们不同比例混合使用和淀粉对涂布箱纸板白度、表面强度和印刷光泽度的影响.结果表明,涂布箱纸板的白度不仅依赖于颜料自身的白度,而且取决于原纸的白度,在褐色箱纸板上涂布时,全高岭土预涂的箱纸板白度高于全GCC预涂的.涂布箱纸板的表面强度和印刷光泽度均随着面涂层中GCC含量的增加而降低.在涂料中加入荧光增白剂(OBA)和淀粉可显著提高涂布箱纸板的白度,淀粉的加入也可提高涂布箱纸板的表面强度,但淀粉对印刷光泽度几乎没有影响.     

彩盒包装盒印刷中涂布白卡纸泛黄 祛黄的小妙招

正产品包装所用到的彩盒,各类商品包装用的包装盒,大多情况下都是用白卡纸做成的。新采购回来的白卡纸,进过分切、印刷、以及后道加工处理就成了我们的产品包装盒。在物质享受日益被重视的今天以及消费者对产品质量及价格的要求,人们对包装纸板的质量要求越来越高,涂布白板纸(又称白卡纸)作为高档包装材料,其精美的外观质量也成为人们的追求目标。但是涂布白板纸在使用过程中包装盒的泛黄现象却严重影响了外包装材料的美观。涂布白板纸泛黄是指产品     

涂布白卡纸涂料配方对复合牢度的影响

通过对涂布白卡纸涂料配方的部分原料种类及用量的调整,提高卡纸的复合（转移）牢度,以使得复合后的涂布白卡纸可以满足后期印刷时对复合（转移）膜牢度的要求。     

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.     

Chlorohydrins of bisphenol A diglycidyl ether (BADGE) and of bisphenol F diglycidyl ether (BFDGE) in canned foods and ready-to-drink coffees from the Japanese market

BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H₂O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.     

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.     

European priorities for research to support legislation in the area of food contact materials and articles

A strong science base is required to underpin the planning and decision-making process involved in determining future European community legislation on materials and articles in contact with food. Significant progress has been made in the past 5 years in European funded work in this area, with many developments contributing to a much better understanding of the migration process, and better and simpler approaches to food control. In this paper this progress is reviewed against previously identified work-areas (identified in 1994) and conclusions are reached about future requirements for R&D to support legislation on food contact materials and articles over the next 5 or so years.     

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