基于工艺参数的无缝内衣机速度动态调节技术

针对无缝内衣机转速控制不稳定造成细针距高弹性针织内衣编织密度不匀、布面容易局部松散的问题,就无缝内衣机编织工艺、速度参数的链条文件表达、细针距高弹性针织内衣的编织特点以及伺服电机控制方式进行研究,提出一种基于工艺参数的无缝内衣机速度动态控制方法。采用速度闭环控制的思路,实时采集内衣机针筒针位信息,根据工艺文件中的速度链条参数,动态调控内衣机主轴转速,实现高转速下细针距高弹性针织内衣编织的密度均匀化控制。阐述了伺服驱动及针位检测电路的硬件设计,人机链条速度获取程序、速度检测程序及速度执行程序的软件开发。结果表明,这一控制技术应用在细针距无缝内衣机上,生产的细针距高弹性针织内衣组织结构一致性好,密度均匀。     

纬编无缝内衣的工艺设计与产品开发

以金天梭公司生产的无缝内衣机TNY-12为例,介绍了无缝针织圆机的编织原理及编织机构,而后结合编织原理阐述了无缝内衣常用组织的编织过程及其结构特点,如平纹添纱组织、浮线添纱组织、添纱浮线组织等.然后对无缝套装各关键部位的设计方法进行简单说明,最后论述了在编织过程中技术要点、如纱线捻向、纱线张力及导纱嘴的位置等.     

无缝内衣机控制系统设计

无缝内衣机作为一种典型的圆型纬编针织机械设备,专门用于生产无缝针织服装。目前高档无缝针织设备主要依赖进口,国内无缝内衣机起步较晚,电脑控制系统在功能、可靠性及稳定性等方面有待提升。通过对无缝内衣机机械结构、编织工艺及控制需求进行分析,提出无缝内衣机控制系统人机交互层、实时控制层和驱动层的三层结构总体设计方案,阐述了控制系统硬件、软件的设计思路。实时控制层通过FPGA芯片内部逻辑电路搭建双口RAM的架构实现人机交互层与实时控制层的数据传输。通过对控制系统整体功能的测试分析,验证了系统设计方案的可行性。测试结果表明,控制系统整体运行可靠、实时性好。     

无缝内衣机选针控制技术研究

针对国产无缝内衣机在高速或长时间工作时会出现乱花、错花现象,以TOP2单面无缝内衣机为研究对象,通过对无缝内衣机的机械结构及编织工艺进行分析研究,设计一种无缝内衣机选针控制系统。介绍总体设计方案,并阐述选针控制系统的软硬件设计思路,最后通过现场调试及应用测试,验证该技术的可行性及有效性。调试结果表明,该选针控制技术的应用提高了国产无缝内衣机控制系统的实时性及稳定性,提高了编织速度,减少了乱花、错花现象的产生。     

无缝针织内衣机的花型准备系统及数据安全

因进口花型制版系统通过加密垄断了针织无缝内衣机的工艺制版技术,为满足国内针织无缝内衣设计生产的需求,设计了一套针对无缝针织内衣机花型及链条动作的数据准备系统,并提出了一种文件数据压缩、加密、解析的算法,以解决数据安全性和大容量问题。花型准备系统分为花型子系统和链条动作子系统,花型子系统用类组织意匠位图表示织物的组织结构,用色彩位图表达编织过程中纱嘴动作;根据无缝针织内衣机的编织工艺、动作流程,为链条动作子系统设计了一系列数据结构表达链条动作文件数据。经现场制版验证,花型设计方便、快捷、高效,花型文件数据小,传输安全可靠。     

无缝内衣机传动机构振动特性研究

传动机构的振动特性直接影响无缝内衣机整机的运行状态，进而影响其生产效率。针对现有无缝内衣机传动机构传动机理不清晰、编织过程中传动机构振动特性难捕获等问题，结合无缝内衣机编织工艺，建立完整的无缝内衣机传动机构模型，并采用三向加速度传感器对电动机、原动齿轮轴、针筒齿轮、针筒以及哈夫盘等关键传动元件在横向、纵向和垂向3个方向上的振动信号进行采集。结果表明：当无缝内衣机的转速为75 r/min时，传动机构的振动频率主要集中在0～1 000.0 Hz，特征频率为553.8 Hz，其中，针筒的横向振动，电动机的纵向振动，哈夫盘的垂向振动比较明显，为如何确定合适的传感器与检测点以及从传动机构振动特性角度检测无缝内衣机整机的运行状态提供了理论及试验依据。     

无缝内衣机调密机构动力学特性研究

针对现有无缝内衣机中密度电动机输出力矩不稳定、测量困难等问题,研究无缝内衣机调密机构动力学特性。结合无缝内衣机成圈及密度调节工艺,建立调密机构三维模型,得到三角滑块推力与电动机转矩间数学关系,运用SolidWorks Motion模块对调密机构进行动力学仿真。搭建调密机构力学测试平台,将测试推力值代入推力与电动机转矩间数学关系计算。结果表明：测试结果与仿真数据相差3.81%,证明理论及建模仿真正确性,给现有无缝内衣机密度调节控制方案中电动机输出力矩控制提供参考。     

T400纤维无缝运动内衣产品开发与性能研究

为了研究T400纤维在无缝运动内衣上的性能,采用T400纤维、锦纶、锦包氨纱为原料在无缝机上进行编织,选用平针添纱、浮线、集圈3种组织编织试样.经过合理的后整理工艺,对织物拉伸性能、折皱弹性、悬垂性、吸湿性、透气性及散热等性能进行测试,分析T400纤维无缝面料与锦包氨纱传统面料的性能差异.结果 表明,T400纤维为面料...     

Photoshop辅助无缝内衣样板设计

针对无缝内衣制版难度较高的问题,通过实践探索应用常规画图软件进行制版,介绍利用Photoshop软件辅助无缝内衣机进行样板设计。以2功位选针的无头无缝内衣机编织方格花型为例,详细介绍绘制无缝内衣组织图的步骤,包括Photoshop参数预设、组织图绘制、保存图案。并以无缝内衣大身为例,介绍制备衣片轮廓图及填充组织图,为方便无缝内衣的样板设计及工艺设计提供参考。     

MC纱与锦纶无缝内衣开发及染色探讨

将MC纱(40%宾霸与60%腈纶混纺)与锦氨包芯纱交织,并采用针织内衣机的特殊编织针法进行织造,以设计开发MC纱与锦纶无缝内衣面料。传统宾霸、腈纶、锦纶织物染色方法多采用三浴法,存在染色织物染色质量不稳定、染色工艺时间长、能耗大、排污量多等问题。文中探讨了MC纱与锦纶无缝产品二浴法染色,并对比传统的除油、三浴法染色工艺和创新两浴法染色。结果表明:创新两浴法染色不仅可以达到快速染色的目的,保证颜色品质及各项色牢度指标,而且可以大幅度节约能源,减少排污,降低染色成本。     

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