纯棉筒子纱低温前处理

采用低温精练剂TANNEX?BE,配以氧漂活化剂TANEDE?GREEN对棉筒子纱进行70℃低温前处理。优化的工艺参数为:27.5%H2O24 m L/L,TANNEX?BE 0.5 m L/L,TANEDE?GREEN 0.9 m L/L,70℃处理50 min。处理后纱线白度为80.56%,毛效11.8 cm/30 min,纱线强力301.84 c N,能够满足后续染色加工的要求。     

纯棉纱线酶氧前处理工艺研究

介绍了以酶为前处理煮漂助剂的生态前处理工艺,并将其与常规碱氧前处理工艺进行对比,分析了两种工艺对毛效、白度、失重率、断裂强力及染色性能的影响。结果表明,纯棉纱线酶氧前处理的优化工艺为:精练酶L用量1.5 g/L,25%双氧水用量4 g/L,处理温度70℃,处理时间60 min。经酶氧前处理最优工艺处理后,纯棉纱线的白度和毛效与经过常规前处理的相当,且棉纤维损伤小,对染色的色光无明显影响。大货生产表明,经酶氧生态前处理的纯棉纱线织造性能较好,染色后纱线强力、色牢度等均符合客户要求,以酶为前处理助剂的生态前处理工艺节能减排,在现实生产中可行。     

漂特灵DM-1436高温低碱免中和快速练漂

介绍了漂特灵DM-1436的基本性能,并用于纯棉筒子纱快速练漂加工中。采用正交试验练漂对快速练漂工艺进行参数优化,将优化后练漂工艺用于大生产实践,测试并对比了快速练漂工艺与传统练漂工艺的练漂效果。结果表明,最佳快速练漂工艺处方为除油剂DM-1130 1.00 g/L、漂特灵DM-1436 1.00~2.00g/L、固体烧碱0.50 g/L、30.0%H2O210.00 g/L,浴比1∶8~1∶10,110℃处理30 min;通过优化练漂工艺,可以实现110℃纯棉筒子纱高温低碱免中和快速练漂,且减少水、电、汽用量及污水排放量;处理后筒子纱白度、吸水性优良,纱线染色性能与传统工艺相同,手感更优且质量损失率降低。     

超声波技术在棉针织物低温练漂中的应用

采用超声波技术,在氧漂精练剂HK-1039协同作用下,对纯棉针织物进行低温前处理。测试并分析了p H值、氧漂精练剂用量、双氧水用量、处理时间、处理温度和超声波频率对前处理效果的影响,并将低温前处理和传统前处理工艺效果进行对比。结果表明,最佳工艺p H值为10、氧漂精练剂HK-1039用量为8 g/L、双氧水用量为20 m L/L、时间80 min、温度55℃、超声波频率为40 k Hz;低温前处理的白度与毛效基本可达到传统前处理工艺效果,且强力损失率较低。     

精梳纯棉筒子纱低温前处理实践

为解决精梳纯棉筒子纱高温98 ℃前处理时,能耗高、纤维损伤大、手感差等问题,采用双氧水低温漂白复合活化剂和低温精练剂进行60 ℃低温精练、漂白。结果表明,纱线前处理白度、毛效和染色效果与传统前处理工艺相当,且节约了大量的蒸汽能源,大幅降低了生产成本。     

菠萝叶纤维卜公茶皂素前处理的可行性

采用卜公茶皂素对菠萝叶纤维纱线进行前处理。分别采用沸煮工艺、轧堆工艺和汽蒸工艺三种方式,测试了处理后菠萝叶纤维的白度、强力和毛效指标,得到的优化前处理工艺为：卜公茶皂素粉末质量浓度20 g/L,卜公茶皂素分散液质量浓度0.8 g/L,浴比1〖KG-*5〗∶〖KG-*5〗30,100 ℃浸渍60 min。处理后纱线具有较好的白度、毛效、强力以及强力保留率。     

筒子染色低温前处理工艺探讨

纯棉筒子纱染色前处理通常在高温98℃下进行,对纱线强度、手感都会产生较大的负面影响,同时不利于节能减排。新工艺利用双氧水低温漂白复合活化剂,实现了在60℃低温下精练、漂白,前处理白度、毛效和染色效果与传统前处理工艺相当;节约了大量蒸汽能源,减少了排放。     

针织物冷轧堆前处理工艺研究

介绍了针织物冷轧堆漂白工艺,分析了其对针织物强力和毛效的影响。测试并比较了双氧水、氢氧化钠、活化剂TAED用量和堆置时间等因素对织物白度的影响,通过正交试验得出最佳工艺条件,并对H2O2/TAED活化体系与传统H2O2漂白体系处理后织物的白度和强力进行比较。结果表明,针织物冷轧堆漂白最佳工艺条件为:室温下H2O2用量18 g/L,NaOH用量15 g/L,TAED用量1 g/L,渗透剂JC-1用量10 g/L,稳定剂JD-22用量4 g/L,堆置时间为24 h;与传统煮漂一浴法和常规冷轧堆前处理工艺相比,H2O2/TAED冷轧堆前处理新工艺大大降低了H2O2和NaOH用量,在织物获得足够白度的基础上,降低了织物的强力损失,耗能少、成本低。     

纯棉织物的低温煮漂一浴工艺

针对全棉织物常规连续前处理工艺流程长、污染大、能耗高、污水处理成本高的问题,提出并开发一种新型低温煮漂一浴短流程前处理工艺,讨论了各种助剂用量及处理时间对处理效果的影响。根据织物白度、毛效、强力等指标,优化了低温煮漂一浴工艺。优化的低温煮漂一浴工艺为：烧碱6 g/L、双氧水（100%）15 g/L、强力精练剂CP-2G10 g/L、氧漂稳定剂HOC 15 g/L、裂解剂HSM 2 g/L,汽蒸条件80℃×45 min。经优化的低温煮漂一浴工艺处理后,布面效果可接近常规工艺的水平,同时大幅减少了能源消耗及污水中COD值、氨氮和磷含量。     

双氧水稳定剂KD在纯棉毛巾前处理中的应用

将新型双氧水稳定剂KD应用于纯棉毛巾冷轧堆前处理工艺,讨论了双氧水和氢氧化钠用量、温度、时间对前处理效果的影响,确定稳定剂KD在纯棉毛巾漂白中的最佳工艺条件为:双氧水(27.5%)质量浓度50g/L,NaOH质量浓度35g/L,堆置温度35℃,堆置时间9h,四乙酰乙二胺(TAED)5g/L,稳定剂KD质量浓度5 g/L,精练渗透剂质量浓度5 g/L。纯棉毛巾经此工艺条件处理后,白度达到80.4,毛效12.1 cm/30 min,断裂强力573.3 N,毛巾手感柔软。冷轧堆前处理工艺中使用稳定剂KD后,碱用量减少,堆置时间缩短,有效改善了纯棉毛巾漂白前处理的品质。     

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