HRSJ43/1型经编机动态优化设计

将多梳经编机成圈运动分解为针床摆动、槽针上下运动、针芯运动、沉降片的运动和脱圈针的运动,并分析了每种机件的运动要求。对HRSJ43/1型经编机重点研究为实现针床摆动、槽针上下运动和针芯运动要求,选用更优的机构结构类型。对选用的机构结构进行尺度优化,对关键零件进行结构优化,使整机转速得到了明显提升。     

经编机梳栉横移曲线特性改善方法

通过对KS型经编机的成圈过程及梳栉的横移运动进行分析,运用机械运动学理论,针对KS型经编机梳栉横移运动曲线,对梳栉横移过程进行分析,得出影响横移运动规律特性值的因素,包括横移针距数、针距、编花凸轮转速以及横移的凸轮转角。分析得出,可通过增大梳栉允许的横移主轴转角对横移运动进行优化,让梳栉横移的时间提早开始,推迟结束,并确保横移的安全,避免导纱针和织针相撞或擦断纱线。通过优化设计,高速经编机梳栉横移的运动性能得到改善,提高了机器运转速度。     

经编机成圈机构的运动学分析

采用UG软件建立高速经编机传动及成圈机构的CAD模型,通过UG/Motion模块对其进行运动学仿真,并分别分析了槽针、针芯、梳栉这3个主要成圈部件的相对运动关系,得出了能够正确实现成圈运动的配合关系曲线。在此基础上,指出了梳栉最佳横移时间以及成圈机构的运动特性对经编机运行的影响。     

双针床经编绒类织物生产设备与工艺特点

国产双针床拉舍尔经编机可分为高速型和低速型两种类型,分别从成圈机件配置、梳栉和脱圈板的配合及成圈过程3方面对它们进行介绍。同时从垫纱、链块排列、针背横移3方面阐述这两种机型编织时各自的工艺特点,并列举出常用的工艺。最后对不同机型生产毛绒产品的用途进行归类,指出高速型双针床经编机由于脱圈板之间的距离比较大,适合生产中长型毛绒产品;低速型双针床经编机主要用于生产短毛绒产品,对纱线质量要求低,原料适用性广。     

双针床经编机间隔距离对纱线需求量的影响分析

为解决双针床经编机栅状脱圈板的间距造成纱线波动问题和分析栅状脱圈板间距与需纱波动量之间的内在联系,使用KEYENCE VW-6000型动态分析三维显微系统追踪双针床经编机成圈过程中织针和导纱针的位移曲线,分析双针床经编机梳栉摆动过程中的导纱针与织针的相互位置配置,并计算双针床经编机成圈机构整体需纱量的波动量。通过建立前针床成圈过程中成圈机件的几何模型,推导出梳栉摆幅和脱圈板间距的函数关系,得出需纱波动量与栅状脱圈板间距之间的线性关系模型。实验结果表明二者之间具有良好的线性关系,设计的具有双倍补偿能力的活动杆式张力杆,可有效减少编织过程中纱线波动的问题。     

第18届上海国际纺织工业展览会经编机述评

介绍第18届上海国际纺织工业展览会经编机和整经机的参展情况及技术特征。指出:推出了新型的双针床槽针拉舍尔经编机;特里科经编机的机号有了新突破;国产多梳贾卡拉舍尔经编机在机器门幅和梳栉数量上仍然保持着领先地位,在编织速度上有了长足的进步;新结构的使用以及电子技术的普遍应用提升了国产经编机的竞争力;国产双针床拉舍尔经编机(含贾卡提花)不仅种类多而且整体水平较高;国产单针床弹性、网眼拉舍尔经编机展示了相当高的水平;用碳纤维增强材料制作的成圈针床得到了广泛的应用。     

关于贾卡提花经编机基本技术组织探讨

贾卡提花经编机,就是常说的提花龙头经编机,用它来生产轻薄装饰织物,是当前时代之趋势,也是其它设备所无与相比的。贾卡提花经编机的成圈机构中,除了通常所有的针床、栅状脱圈板、地梳栉机件外,     

非对称直线-余弦-直线运动规律及其在经编机中的应用

为满足多梳栉经编机槽针运动要求,分析了非对称型直线-余弦-直线组合运动规律的组成和表达参数、偏移量与加速度极值之间的关系,推导出从动件运动位移、速度、加速度和跃度与三段凸轮转角比例之间的关系,利用边界点条件确定出每段运动过程中的积分常数和加速度极值。与选定的一种非对称余弦加速度运动规律相比,采用非对称型直线-余弦-直线组合运动规律的加速度和跃度极值均有不同程度减小。将该运动规律应用于经编机槽针上下运动凸轮机构,在槽针运动轨迹上升段,轨迹高度位置有一定程度提升,有利于退圈和避免前面梳栉导纱针上的纱线与后面梳栉导纱针之间的干扰。     

RSJWW型贾卡拉舍尔机

Liba和1WS公司生产的RSJWW型贾卡拉舍尔机以其独特的贾卡提花方式于1957年开始投放市场。它们有两把贾卡梳栉和适当数目的地梳栉。可以编织平坦的衬纬花纹,也可编织毛圈型的立体花纹。并配有4色选纬的全幅衬纬装置。在成圈运动中,贾卡梳栉只作侧向横移、无前后摆动,针槽板固定于机架上。舌针床仅作上下升降运动。梳栉横移由曲面链块控制。贾卡导纱针插入贾卡梳栉的导轨中,     

提高GE2296型双针床经编机速度的技术

为了适应双针床经编机高速编织的要求,对经编机的传动机构进行了改进研究,包括采用曲轴连杆机构代替传统的共轭凸轮机构或偏心连杆机构,加入风冷式润滑冷却系统,对针床及脱圈板采用镂空设计。结果表明:曲轴连杆机构使经编机的速度稳定达到了1 000横列/min,提高了机器在高速运行时成圈机件的传动平稳性和运动配合精度;风冷式润滑冷却系统调节简单方便,很容易控制各油路油压的大小,并能有效地对曲轴和轴瓦进行冷却和润滑;对针床及脱圈板采用镂空设计,可以减小机件因环境温度变化带来的变形问题。     

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