再生纤维高效利用困局与应对策略

2021年起外废零进口政策的正式实施,使原本就纤维原料短缺的我国造纸行业原料供应更加困难重重。如何以科技创新方式提高国废纤维质量,延长再生纤维使用寿命、提升再生纤维造纸品质,是目前造纸科研工作的重要任务。专题特邀华南理工大学万金泉教授撰文,介绍了目前再生纤维处理及利用技术中的困局,并简要分析提高再生纤维质量的多种应对策略。     

再生植物纤维性能恢复的研究进展

再生植物纤维即二次纤维是非常重要的造纸纤维原料,占造纸原料的75%以上,再生纤维造纸具有节约能耗、降低生产成本、保护环境等重大意义。但随着其回用次数的增加,部分微细纤维间的氢键很难打开,使得纤维吸水润胀能力降低,纤维变得比较脆硬、韧性下降,从而导致成纸的物理强度下降,上述问题在极大程度上限制了再生纤维的回收利用。本文分析介绍了再生植物纤维性能恢复的研究现状,综述了各种改性方法及其机理,并展望了再生纸浆性能恢复的意义和前景。     

多措并举 深度挖潜 应对全面禁废新挑战

2021年伊始,全面禁止废纸进口政策正式落地施行,为了明晰新时期国内再生纤维资源市场供求、废纸利用装备、技术利用等现状及未来发展趋势,探讨废纸回收、造纸、包装产业链协调共生的策略与路径,本刊特别制作了“再生纤维高效利用”系列专题。本期内容邀请相关领域专家就禁废令背景下我国造纸原料解决方案进行探讨,并重点介绍了我国再生纸浆的进口现状、前景,以及面临的新情况等。     

我国造纸工业亟需认真应对原料的短缺

随着我国造纸工业的快速发展,纸张总产量的迅速增长,造纸纤维原料的供给不足已成为制约我国造纸工业发展的重要因素。造纸原料短缺问题将是长期困扰我国造纸工业持续、健康发展的瓶颈,今后将会越来越严重。造纸原料是造纸工业发展的基础。在我国造纸工业今后的发展过程中,始终存在着原料结构必须尽快调整和原料短缺必须尽快解决的两大课题。我国造纸工业原料结构的不合理,表现在木浆占我国造纸纸浆总用量的比例低。在国产纸浆中木浆比例不足10%。近年来我国每年不得不大量进口木浆,进口数量逐年大幅度增加,2004年已达731.8万t,年增长率在15%…     

造纸化学品开发的热点取向

业内人士分析 ,今后我国造纸化学品行业将重点发展以下几种产品 :①草浆配套用化学品我国造纸工业以非木材纤维为主要原料、非木浆纤维达６０ % ,由于大量使用纤维短、强度差的草类纤维 ,以至在纸和纸板的产品质量上受到很大的影响。因此 ,以草木并用生产高档纸和其它纸品配套的造纸化学品结构 ,将转向以草浆为主或全草浆生产高档纸及其它纸品配套的造纸化学品结构。重点是增强剂、增白剂、施胶剂等系列草浆配套化学品。②纤维再生所需化学品国内由于木材纤维资源的缺乏 ,纤维的再生利用已逐步受到重视。国内引进了几套利用进口废纸再生制高…     

再生纤维浆循环利用成套装备的研制与应用

根据国家环保政策要求,国外废纸自2021年起严禁进口,造成国内造纸行业面临阶段性原料短缺的问题。为改善这一现状,再生纤维浆将是补充国内造纸原料的有效途径之一。再生纤维循环利用处理系统通过在境外把废纸原料处理成纤维状态,将符合国家环保要求的可用纤维重新打包进口到国内使用,用以弥补造纸原料的不足。该处理系统采取干法制备处理方式,配备基于云服务的自控系统,整体设计理念先进,自动化程度高,通过装备上云实现了整套生产线的远程运维服务。     

行业动态

美国最大再生纤维 供应商直面中国废纸进口 美国GP集团Harmon公司首席运营官等一行6人近日来华,他们此行目的是在中国推行减少中间环节,直接向中国企业提供再生纤维的新型购销方式。 2002年我国进口废纸687.26万吨,而去年的进口废纸量已达1250万吨,成为主要的废纸进口大国。我国造纸原料中的废纸比重超出世界水平10个百分点,对废纸资源有很大的依赖性。     

我国非木材纤维制浆的发展概况与技术进步（之二） 蔗渣、芦苇和棉秆

非木材纤维是我国主要的造纸原料之一,非木材纤维制浆造纸在我国造纸工业发展史上发挥了重要的作用。本文综述我国主要非木材纤维——蔗渣、芦苇和棉秆制浆的发展概况与技术进步。     

积极利用非木材纤维资源——解决造纸工业原料短缺问题

玉米秸秆、毛竹资源丰富,巨菌草种植推广潜力巨大,对解决我国造纸工业纤维原料严重短缺问题,推动造纸行业高质量发展具有重要意义.本文主要介绍了玉米秸秆、毛竹、巨菌草的资源情况及纤维原料特性,分析了充分开发这几种纤维原料,逐步替代进口纤维原料的可行性.     

多措并举 深度挖潜 应对全面禁废新挑战

为了明晰新时期国内造纸纤维资源现状及未来发展趋势，本刊特别策划了“纤维原料”大型专题。在废纸纤维原料部分，特邀行业领导、纸企、科研院所、装备制造及化学品企业等相关领域权威专家就禁废令背景下我国造纸纤维原料解决方案进行分享。本期内容重点回顾了中国轻工业联合会原副会长钱桂敬在2021再生纤维利用技术创新发展论坛上的主旨报告，并就2021年中国再生纤维市场情况做了分享。     

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