防紫外织物新进展

1　前　言　　阳光中的紫外线可以根据波长分为三部分 :UVA,波长为 32 0 nm～ 40 0 nm;UVB,波长为2 90 nm～ 32 0 nm;UVC,波长为 2 0 0 nm～ 2 90nm。UVC具有的能量高 ,但被臭氧层吸收不能到达地面 ;波长较长的 UVA,能量低一些 ,几乎全部到达地面 ,它能深深地穿透真皮 ,使皮肤过早老化 ,失去弹性 ,出现皱纹 ;短波长高能量的 UVB射线可以穿透皮肤几毫米 ,使皮肤产生黑色素 ,出现晒黑和晒斑。如果晒黑和晒斑反复发生时 ,尤其是儿童和年青人——会相当大程度地增加以后几年内患黑色素瘤的危险。UVB是影响人类健康的重要角色 ,一定时期…     

革新改造

<正>精灵8型异纤分拣机的安全防护改进众所周知,紫外线在电磁波谱中位于可见光和X射线之间,波长偏短,最短的仅有10 nm,最长的也不超过400 nm,故紫外线的穿透性、辐射性较强。其中波长为200 nm~280 nm的C波段紫外线(UVC)对微生物有很大的破坏作用,对人体的眼睛、皮肤有极大的伤害;波长为280 nm~315 nm的B波段紫外线(UVB)会使皮肤产生白     

紫外吸收剂的防护性能

1　紫外辐射对皮肤的伤害紫外辐射 (UVR)占太阳光的 6% ,分为近紫外线 (UVA)、远紫外线 (UVB)和超短紫外线(UVC)三种 ,它对人体皮肤的作用不但取决于紫外线的种类而且与肤色有关。UVC基本上可以被外表皮和真皮组织完全吸收 ,UVB透射能力比UVA差 ,只有UVA( 32 0nm～ 40 0nm)可以透射到真皮组织下面 ,加速皮肤的老化。在这种作用下 ,皮肤会出现斑点 ,并变得粗糙、褶皱、松弛 ,还会导致皮肤癌。UVA吸收剂 (或屏蔽剂 ) ,如苯甲酮、氨基苯甲酸盐和联苯甲酰甲烷 ,用于防晒油和防晒霜 ,这些化学物质在 32 0nm～ 360nm的区域内吸收紫外线…     

太阳镜镜片透射比特性的计算机计算

1、光的基础知识 光是一定波长的电磁波，光辐射测量所涉及到的波长范围：包括波长为380nm-780nm的可见光区域；波长大于780nm而小于1mm的红外光区域；波长380nm-1nm的紫外光区域。而紫外线辐射则大致分为三个区：380nm-315nm的UVA区；315nm-280nm的UVB区：以及280nm-10nm的UVC区。由于波长小于280mm的紫外线光辐射极易被空气强烈吸收，所以在太眼镜的要求指标中不予考虑。     

有防护性能的紫外吸收剂

紫外线辐射(UVR)大约占太阳辐射的6％，包括UVA、UVB和UVC辐射。紫外线对皮肤的影响是由辐射的类型和皮肤色素沉积决定的。UVA辐射(波长320—400nm)可以渗透皮肤表层，导致下层皮肤的损伤，引起皮肤过早衰老、粗糙、长雀斑、松弛并易有皱纹。UVA还会导致皮肤癌，     

竹原纤维/毛交织花呢的防紫外线性能

为了更好发挥竹原纤维在精纺呢绒中的防紫外线性能,从新品开发的角度着手,通过对几种不同含量竹原纤维/毛交织花呢防紫外线性能的比较,证实竹原纤维含量越多,织物对紫外线反射能力越高,紫外线防护性能越好;竹原纤维含量为50%的织物,对紫外线的吸收,尤其是对UVC的反射能力较高,该织物的紫外线防护性能较好;各面料的透过率主要取决于其对紫外线的吸收率,竹原纤维含量为20%的面料对UVA、UVB的透过率最低,含量为50%的面料对UVC的透过率最低。研究结果为竹原纤维新材料在精毛纺中的应用提供了参考。     

基于纳米粉体的织物抗紫外线研究

通过纳米粉体反射光谱和纳米树脂薄膜紫外线透过率的测试，筛选出的纳米粉体．应用到棉织物上，使得织物抗紫外线性能符合抗紫外线标准要求．研究结果表明，丙烯酸树脂对UVA波段吸收较强；二甲苯含量对紫外线透过率有一定影响；对于相同厚度的膜，二甲苯比例越大，紫外线透过性能越好．随着纳米粉体含量增加，纳米膜抗紫外线效果会增强．对于ZnO、TiO2纳米粉体，波长320nm的紫外线透过率与纳米粉体含量呈负指数关系，当添加量达到4％以后，棉织物的紫外线透过率在0．5％以下。     

Rayosan C对棉针织物的防紫外线整理技术

介绍了Rayosan C抗紫外线吸收剂对棉针织物的整理工艺流程、工艺配方.分析了染料颜色、浓度对Rayosan C防紫外线的效果影响,得知Rayosan C抗紫外线吸收剂整理后的棉针织物能够吸收大部分紫外线UVB和部分紫外线UVA,防紫外线效果显著.     

功能性纺织品的功能评价方法与标准化现状(二)

3 纺织品抗紫外性能的评价方法与标准 到达地球表面的太阳光，其波长范围为280—30000nm，分别由紫外线（5％）、可见光（50％）和红外线（45％）组成。其中，紫外线由波长较短、强度较大的UV—B（280—315nm）和波长较长、能量较低的UV—A（315—400nm）及波长小于280nm的UV—C组成。紫外线是一种对人类既有利又有害的电磁波，它有助于人体内维生素D的合成和钙的吸收，同时还具有杀菌、消毒的功效，但过量的紫外线会使人体皮肤产生红斑、皮炎、色素沉积，甚至引起皮肤癌。研究表明，     

DNS法测定木糖含量时最佳测定波长的选择

为了正确地选择DNS法测定木糖含量时的最佳测定波长,扫描了木糖与DNS试剂反应液的紫外-可见吸收光谱(400～700nm),并分析测定了其在480、500、520、540、550、560nm时的OD值。结果表明:木糖与DNS试剂反应液的最大吸收波长在480～490nm;在480nm波长下测定时,灵敏度最高,且于150～600μg/ml范围内呈现较好的线性关系,其回归系数r值=0.99997,回收率大于99.6%。在500、520、540、550、560nm测定时,灵敏度依次降低。因此,DNS法测定木糖时的最佳测定波长为480nm。     

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.     

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     

INFOPRINT 2014 was Successfully Held in Dongguan

Sponsored by Printing and Printing Equipment Industries Association of China （PEIAC） and organized by Print China magazine, the Seventeenth Beijing International Printing Information Conference （INFOPRINT 2014） was successfully held on 11th Dec. 2014 at Dongguan Exhibition International Hotel.