低碳印刷呼唤低碳纸张：新型纳米石科纸和雪铜纸

随着纳米等高新技术在造纸上的应用,不仅大大提高了纸张的质量,而且还研制生产出符合环保要求、具有特殊性能的纸张。如利用石头粉为主要原料生产的纳米石科纸和环保雪铜纸,就是非常适应低碳印刷的环保用纸。     

石头纸能用于食品包装

据行业人士介绍,石头纸继用于办公、印刷用纸后,又开发生产了与食品相关的用纸、塑袋,如牛奶盒、粮食包装、肉类包装、桌布、餐巾纸、包装箱、购物袋等,由于石头造纸成本低,销售价格比非石头类产品低15％以上,如果不考虑平衡市场价格因素,售价还有下行空间。石头纸可以广泛用于食品包装、食品购物袋及餐饮用品。     

石头纸与PP合成纸的性能检测及分析

2010年3月的"两会"上,石头纸引起了业内人士的关注,目前对于石头纸的探索主要集中在其生产工艺及应用方面,对于其与PP合成纸的印刷性能的差异性研究较少。从石头纸的制作原料来看,其与PP合成纸具有几乎相似的组成成分,本文从石头纸和PP合成纸的物理性能及印刷特性出发,比较两种类型的纸张的差异,并对产生差异的原因进行分析。通过分析,可以为包装印刷行业在选择方面提供一定的借鉴。     

4月10日起,四川纸协会员执行《本色竹浆》团体标准

正本刊讯(钟华报道)近几年来,四川在发挥竹浆优势,生产生活用纸特别是本色生活用纸,开拓本色生活用纸市场方面,取得了显著成效。首先,为更好推广竹浆生活用纸品牌,四川省造纸行业协会申请了"竹浆纸"集体商标,供制浆、造纸、纸品加工企业共同使用,共同维护竹浆纸的产品质量,推动竹浆生活用纸市场的良性发展。     

石头纸的特性及其应用分析

<正>石头纸是一种集成纸张和塑料特点和性能的新型材料,属于具有高碳酸钙含量的合成纸。石头纸代替塑料产品,既节约石油资源,又增加降解程度,且价格低廉;若代替纸张,其生产制造过程中不需水和木浆,可节约能源。石头纸的优点引起了业内广泛关注,在2010年全国"两会"上,与会代表委员使用的会议通知、日程表、便     

低碳环保包装产业的助推器——石碳环保纸

<正>石碳环保纸即石头纸,其不是植物纤维(木浆)纸,也不是薄膜塑胶(合成)纸,而是将石头矿物质研磨成粉末,加上高分子(树脂)化合物和其他辅助剂混炼而制成的另一种纸。其以碳酸钙为主要原料,集成了传统纸张和塑料特有性能而介于两者之间的新型环保材料,将石头的主要成分碳酸钙研磨成超细微粒,以高分子材料和助剂为辅助原料,利用高分子界面化学原理和填充改性技术,经特殊工艺加工而成。其继用于书写、办公和印刷用纸后,可以用于食品用纸、塑袋等包装行业,为包装行业带来了新的生机。     

浅议“石头纸”

<正>2010年3月,人大和政协"两会"期间,据称代表委员们首次用上了所谓"石头纸"制成的便签本、手提袋、垃圾袋等,而且这种"石头纸"是不用纤维原料、不用水生产,可全部降解,完全无污染的环保纸。对所称"石头纸"这一     

节能环保型双面起毛造纸机

正书法家和画家对于承载书画艺术作品的用纸是十分考究的,一般来说,书画用纸应当具有"双面起毛无光泽、吸墨饱满浸润自然"的基本品质特性。目前,在我国书画艺术界已经普遍公认:传统的安徽宣纸和夹江宣纸是最能展示书画艺术神韵的纸品。但是,上述书画用纸长期以来都是采用"手工制作、自然风干"的作业方式来进行生产的,它在实际制作过程中存在工人劳动强度大、生产成本高、质量稳定性     

功能性烟支用纸的开发及应用

对现有烟支用纸进行改性,制备功能性烟支用纸,在卷烟的增香保润和减害降焦等方面发挥着积极的作用。本文综述了成型纸、接装纸、卷烟纸和纸质滤嘴棒用纸改性的研究进展,为开发适用于产品的功能性烟支用纸提供新思路和新方法。     

解读“石头纸”

2010年3月,一种所谓"石头纸"的产品高调亮相"两会",一时间引起热议,并刮起了一阵"石头风"。本期,本刊特邀造纸行业知名专家为您详细解读"石头纸",介绍"石头纸"的制造工艺、用途、存在问题以及与其相关的专利技术。     

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.     

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.     

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.     

Detection of adulteration of locust bean gum with guar gum by capillary electrophoresis and polarized light microscopy

Capillary electrophoresis (CE) and polarized light microscopy (PLM) were utilized in the detection of the adulteration of locust bean gum with guar gum. For CE analyses, standards of locust bean and guar gums were extracted with 30% CH₃CN, removing the residual proteins from the gum matrix. A 8.75 mM NaH₂PO₄-20.6 mM Na₂B₄O₇ buffer, pH 9, was used to separate these proteins and to identify marker proteins that were present in the guar gum. These markers did not co-migrate with components in the extracts of mechanically processed locust bean gum, and are used as indicators of adulteration. Using PLM with toluidine blue and iodine staining techniques, unadulterated locust bean gum samples were distinguished from mixed samples through the differential staining of components in locust bean versus guar and tara gums. These experiments in the use of CE and PLM provide orthogonal and complementary methods for the verification of 'true' positives and the elimination of 'false' positives.