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。     

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。     

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     

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。     

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。     

Textural Properties of Cold-set Gels Induced from Heat-denatured Whey Protein Isolates

A 9% whey protein (WP) isolate solution at pH 7.0 was heat-denatured at 80°C for 30 min. Size-exclusion HPLC showed that native WP formed soluble aggregates after heat-treatment. Additions of CaCl2 (10–40 mM), NaCl (50–400 mM) or glucono-delta-lactone (GDL, 0.4–2.0%, w/v) or hydrolysis by a protease from Bacillus licheniformis caused gelation of the denatured solution at 45°C. Textural parameters, hardness, adhesiveness, and cohesiveness of the gels so formed changed markedly with concentration of added salts or pH by added GDL. Maximum gel hardness occurred at 200 mM NaCl or pH 4.7. Increasing CaCl2 concentration continuously increased gel hardness. Generally, GDL-induced gels were harder than salt-induced gels, and much harder than the protease-induced gel.     

Occurrence of bisphenol-F-diglycidyl ether (BFDGE) in fish canned in oil

The levels of bisphenol-F-diglycidyl ether (BFDGE) were quantified as part of a European survey on the migration of residues of epoxy resins into oil from canned fish. The contents of BFDGE in cans, lids and fish collected from all 15 Member States of the European Union and Switzerland were analysed in 382 samples. Cans and lids were separately extracted with acetonitrile. The extraction from fish was carried out with hexane followed by re-extraction with acetonitrile. The analysis was performed by reverse phase HPL C with fluorescence detection. BFDGE could be detected in 12% of the fish, 24% of the cans and 18% of the lids. Only 3% of the fish contained BFDGE in concentrations considerably above 1mg/kg. In addition to the presented data, a comparison was made with the levels of BADGE (bisphenol-A-diglycidyl ether)analysed in the same products in the context of a previous study.     

Contribution of European research to risk analysis

The European Commission's, Quality of Life Research Programme, Key Action 1—Health, Food & Nutrition is mission-oriented and aims, amongst other things, at providing a healthy, safe and high-quality food supply leading to reinforced consumer confidence in the safety of European food. Its objectives also include the enhancing of the competitiveness of the European food supply. Key Action 1 is currently supporting a number of different types of European collaborative projects in the area of risk analysis. The objectives of these projects range from the development and validation of prevention strategies including the reduction of consumers risks; development and validation of new modelling approaches; harmonization of risk assessment principles, methodologies, and terminology; standardization of methods and systems used for the safety evaluation of transgenic food; providing of tools for the evaluation of human viral contamination of shellfish and quality control; new methodologies for assessing the potential of unintended effects of genetically modified (genetically modified) foods; development of a risk assessment model for Cryptosporidium parvum related to the food and water industries; to the development of a communication platform for genetically modified organism, producers, retailers, regulatory authorities and consumer groups to improve safety assessment procedures, risk management strategies and risk communication; development and validation of new methods for safety testing of transgenic food; evaluation of the safety and efficacy of iron supplementation in pregnant women; evaluation of the potential cancer-preventing activity of pro- and pre-biotic ('synbiotic') combinations in human volunteers. An overview of these projects is presented here.     

低温带皮菜籽粕微粉的不同粒级部分的功能特性

为研究低温带皮菜籽粕微粉的不同粒级部分的功能特性,以经低温脱脂的带皮菜籽粕为原料,经微粉碎后筛分成212~425μm、150~212μm和106~150μm的3个不同粒级的微粉样品,检测这些样品的吸水性、吸油性、乳化性和乳化稳定性、蛋白质体外消化率。结果表明:1 3个不同粒级的微粉样品之间的粗纤维含量存在显著差异,表明三者的结构组成成分有一定差异。23个微粉样品的乳化活性和乳化稳定性随粒度级别的减小而显著增加(P0.01)。33个微粉样品的蛋白质体外消化率随粒度级别的减小而显著增加(P0.01)。4不同粒级带皮菜籽粕微粉样品的吸水性与吸油性受其结构组成物质不同和粒度的双重影响,与粒度的相关性不明显。     

Microbiology of food taints

Fresh and processed foods are often spoilt by the presence of undesirable flavours and odours caused by microbial action. The aim of this paper is to review the current knowledge of microbiologically induced taints that occur in a wide range of foodstuffs, including meats, poultry, fish, crustaceans, milk, dairy products, fruits, vegetables, cereals and cereal products. Examples have been chosen where the compounds responsible for the taint have been identified and sufficient data obtained to demonstrate the involvement of microorganisms. However, in some cases the full identity of the causative organism may not have been elucidated. The types of microorganisms covered by this review include bacteria, fungi, yeasts, actinomycetes and cyanobacteria. Although cyanobacteria do not in general infect foods, their presence in aqueous systems and water supplies can lead to off-flavours in aquatic organisms and processed foodstuffs. Several examples of each of these processes are discussed. Wherever possible, the likely biosynthetic pathway used by the microorganism to produce the offending compound in a foodstuff is indicated.     

Analysis for organic residues from aids to polymerization used to make plastics intended for food contact

Polymers intended for food contact use have been analysed for organic residues which could be attributed to a range of substances employed as polymerization aids (e.g. initiators and catalysts). A wide range of polymers was extracted with solvents and the extracts analysed by gas chromatography-mass spectrometry (GC-MS). The overwhelming majority of substances identified were not derived from aids to polymerization but were oligomers, additives and adventitious contaminants. However, a small number of substances were identified as initiator residues. These included tetramethylsuccinonitrile (TMSN) which was observed in two polymers and it derived from recombination of two azobisisobutyronitrile (AIBN) initiator radicals. Methyl benzoate, benzoic acid, biphenyl and phenyl benzoate were detected in one poly(methyl methacrylate) sample and in two polyvinylchlorides and they are thought to be derived from benzoyl peroxide initiator. TMSN was subsequently targeted for analysis of poly-(methyl methacrylate) plastics using proton nuclear magnetic resonance spectrometry (¹     

Tests of potential functional barriers for laminated multilayer food packages. Part II: Medium molecular weight permeants

Experiments were performed to characterize the kinetics of the permeation of different medium molecular weight model permeants: bisphenol A, warfarin and anthracene, from liquid paraffin, through a surrogate potential functional barrier (25 microns-thick orientated polypropylene--OPP) into the food simulants olive oil and 3% (w/v) acetic acid. The characterization of permeation kinetics generally observed the permeation models previously reported to explain the experimental permeation results obtained for a low molecular weight group of model permeants. In general, the model permeants exhibited behaviour consistent with their relative molecular weights with respect to (a) the time taken to attain steady-state permeation into the food simulant in which they were more soluble, (b) their subsequent steady-state permeation rates, and (c) their partition between liquid paraffin and the OPP membrane.     

The development of reference materials for paralytic shellfish poisoning toxins in lyophilized mussel. I: Interlaboratory studies of methods of analysis

This paper describes the first part of a project undertaken to develop mussel reference materials for Paralytic Shellfish Poisoning (PSP) toxins. Two interlaboratory studies were undertaken to investigate the performance of the analytical methodology for several PSP toxins, in particular saxitoxin (STX) and decarbamoyl-saxitoxin (dc-STX) in lyophilized mussels, and to set criteria for the acceptance of results to be applied during the second part of the project: the certification exercise. In the first study, 18 laboratories were asked to measure STX and dc-STX in rehydrated lyophilized mussel material and to identify as many other PSP toxins as possible with a method of their choice. In the second interlaboratory study, 15 laboratories were additionally asked to determine quantitatively STX and dc-STX in rehydrated lyophilized mussel and in a saxitoxin-enriched mussel material. The first study revealed that three out of four postcolumn derivatization methods and one pre-column derivatization method sufficed in principle to determine STX and dc-STX. Most participants (13 of 18) obtained acceptable calibration curves and recoveries. Saxitoxin was hardly detected in the rehydrated lyophilized mussels and results obtained for dc-STX yielded a CV of 58% at a mass fraction of 1.86 mg/kg. Most participants (14 out of 18) identified gonyautoxin-5 (GTX-5) in a hydrolysed extract provided. The first study led to provisional criteria for linearity, recovery and separation. The second study revealed that 6 out of 15 laboratories were able to meet these criteria. Results obtained for dc-STX yielded a CV of 19% at a mass fraction of 3.49mg/kg. Results obtained for STX in the saxitoxin-enriched material yielded a CV of 19% at a mass fraction of 0.34mg/kg. Saxitoxin could not be detected in the PSP-positive material. Hydrolysis was useful to confirm the identity of GTX5 and provided indicative information about C1 and C2 toxins in the PSP-positive material. The methods used in the second interlaboratory study showed sufficiently consistent analysis results to undertake a certification exercise to assign certified values for STX and dc-STX in lyophilized mussel.     

The Ministry of Environmental Protection Issued "Feasible Technology Guidelines for Pollution Prevention and Control in Wood Pulping Process of the Paper Industry (Trial)" and Two Other Guiding Technical Documents

On December 27t＂, 2013, the Ministry of Environmenta Protection announced that, in order to implement ＂The Environmental Protection Law of the People＇ s Republic of China＂, improve the working system in environmenta protection technologies, and promote technologica advancement in pollution prevention, the Ministry of Environmental Protection sponsored the formulation of three guiding technical documents including ＂Feasible Technology Guidelines for Pollution Prevention and Contro n Wood Pulping Process of the Paper Industry （Trial）＂     

1~(st) Intelli-Tissue~ EcoEc Tissue Machine Supplied by PMP Group Successfully Put into Operation in China

正On April 29th,2014,Intelli-Tissue EcoEc tissue machine supplied by PMP Group successfully put into operation at Hebei Xuesong Paper Co.,Ltd.,this is the first such kind of paper machine of PMP Group in China.