造纸涂料过筛除气效果及影响因素研究

分析了除气前造纸涂料中气泡的分布特点,研究了不同目数筛网及不同筛网组合方式对振筛除气的影响,并进行了工厂中试试验。结果表明,在实验所选组合方式中,325-400-400目的组合方式最佳,且中试振动筛与实验室振动筛的除气效果相近,但中试振动筛的过筛速率更高。     

振动筛网安装方式小改进

文章针对振动筛网原安装方式存在的弊端,提出运用斜铁张紧方法进行压接,取得成功,使一幅筛网的使用寿命由原来的7—20天,提高到现在的4-6个月,保障了盐质,保障了生产正常有序进行。     

防堵纸浆振动筛

申请公布号:CN 107670977 A发明人:秦焕秋申请人:诸城市远鸿纸业有限公司提供一种防堵纸浆振动筛。如图1所示,防堵纸浆振动筛包括筛网固定框和底座。筛网固定框通过其四周的震动弹簧支撑在底座上,底座一侧的电机座上支撑有带偏心轮的震动驱动电机,偏心轮通过传动杆与筛网固定框的一侧转动连接,并带动筛网固定框震动。筛网固定     

基于ANSYS的振动筛的有限元建模技术研究

提出一种使用编程的方式对振动筛进行直接有限元建模的方法。该方法在分析筛网结构的基础上,根据其结构特征,把筛网分为重复性结构和非重复性结构两部分,然后依次对这两部分创建节点和单元,从而完成振动筛有限元模型的建立。为了考察所建模型的网格质量,把振动筛进行自由网格划分得到另外一种有限元模型,然后分别对这两种有限元模型进行了单元质量检查。结果表明:本方法所创建的有限元模型在各个方面都比自由网格划分的质量好。本文提出的方法避免了振动筛自由划分网格的耗时和复杂性,为类似的具有规则多孔结构的有限元网格划分提供了一种新思路。     

基于DEM离散元技术的玉米直线振动筛仿真分析

目的：分析物料颗粒在直线振动筛面上的运动情况,以便直线振动筛的机构优化。方法：基于离散单元法,采用EDEM软件对直线振动筛面上物料颗粒的运动情况进行仿真分析。以堆积角为响应,采用批处理的形式对仿真物料颗粒的离散元仿真参数进行校准;采用SolidWorks软件建立直线振动筛的三维模型,以物料在筛网面的下落高度、物料颗粒的形状尺寸为变量,以物料颗粒在筛网面上运动的平稳程度为指标,通过仿真,观察物料颗粒在晒网面的运动速度及位置分布情况。结果：单球形颗粒的速度分布相对较大,在达到振动筛分平稳阶段,单球形玉米颗粒的速度分布相对稳定,颗粒跳动现象明显减少。双球形玉米颗粒的速度分布相对较小,在达到筛分的稳定阶段,双球形玉米颗粒的位置跳动比较明显。双球形玉米颗粒在振动筛面的速度明显低于单球形玉米颗粒,不同下落高度的单球形玉米颗粒对振动筛分有一定的影响。结论：在对直线型振动筛分设计过程中,不同的高度,不同的颗粒形状对筛分的效率都有较大的影响,基于离散元法可以有效地分析物料振动筛分情况。     

振动筛网安装方式小改进

针对振动筛网原安装方式存在的弊端,提出运用斜铁张紧方法进行压接,取得成功,使一幅筛网的使用寿命由原来的7d～20d,提高到现在的4个月～6个月,保障了盐质,保障了生产正常有序进行。     

振动筛网安装方式小改进

针对振动筛网原安装方式存在的弊端,提出运用斜铁张紧方法进行压接,取得成功,使一幅筛网的使用寿命由原来的7 d～20 d,提高到现在的4个月～6个月,保障了盐质,保障了生产正常有序进行.     

清理用高效筛网

1传统筛网的缺陷目前，谷物清理筛（自衡振动筛、平面回转筛和平面回转振动筛等）一般均采用0．75－1．smm的Q235－A普通钢板冲孔的钢板网，或用普通低碳钢丝编织的筛网，这些筛网存在以F缺点：a）耐磨性差；b）开孔率小；C）由于Q235－A的弹性小，粮粒与杂质容易堵塞网孔；d）筛网的平面度差，影响筛理效果；e）钢丝编织网的经。纬钢丝交接处容易松动，引起网孔变形，影响筛理质量；f）除杂效率低，台时处理量小，能耗大。2改进后筛网的优点为克服现行筛网的这些缺点，最近我厂聘请粮油机械专家开发成功高效筛网，其结构如图1所示，现将…     

滚桶式旋转振动筛简介

我厂是一个新建盐厂,所使用的振动筛和其他厂家使用的振动筛的结构和原理一样,是利用偏心轮的偏心作用强迫筛体振动,以达到对产品筛分的目的。在实际生产的使用过程中,由于该振动筛的单层裸体结构,存在噪音大、外环境粉尘浓度严重超标,筛网损失严重,产品粒度不能达到指标     

反共振振动筛支撑弹簧的类型选用和仿真研究

以反共振理论为基础,通过建立反共振振动筛的数学模型,并对其进行动力学分析求解,最后得到系统阻尼与稳态响应的关系曲线。根据四种弹簧组合方式,得到不同的系统模态响应的大小。通过对四种弹簧组合方式进行数值分析及虚拟样机的仿真,最后得到弹簧的最佳组合方式,为该类机械的设计提供可靠的参考依据。     

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