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1.
新型纺纱技术发展与产品开发   总被引:1,自引:0,他引:1  
介绍了转杯纺竹节纱和包芯纱的成形原理、设备改进、工艺条件和成纱指标的测试结果,还叙述了喷气纺的成纱过程、成纱结构及其优良性能。  相似文献   

2.
转杯纺不锈钢丝包芯纱的纺制   总被引:1,自引:1,他引:0  
探讨转杯纺不锈钢丝包芯纱的生产工艺.介绍了转杯纺不锈钢丝包芯纱的生产原理,通过对转杯纺纱机进行改造并正确配置不锈钢丝喂入张力、分梳辊转速、转杯直径及转速、捻系数、阻捻盘规格以及卷绕张力等工艺参数,最终成功纺制出36.4 tex(33.3 dtex)转杯纺不锈钢丝包芯纱,该纱包芯效果良好,条干均匀,强力较高,毛羽较少,质量达到了较好水平.  相似文献   

3.
《上海纺织科技》2005,33(11):61-61
转杯纺纱存在易于使纤维失去柔韧性的问题,从而降低其性能。为克服这一问题,捷克Rieter CZ AS公司开发了一种多组分纱纺纱技术,其专利为:欧洲专利EP1352992。该系统可将连续组分长丝与转杯纺机纺的短纤维混合。此外采用一传感装置监控纺纱单元和卷取装置之间的长丝,使该芯丝被转杯纺的短纤维包绕而成包芯纱。专利称这种类型的转杯纺机尤其适用于弹性包芯纱的生产。  相似文献   

4.
通过将转杯轴中心开孔,借助转杯负压的作用引入长丝的方法纺制了转杯纺氨纶丝/短纤包芯纱;通过在传统环锭细纱机上加装一个长丝喂入装置的方法纺制Sirofil包芯纱.测试了这两种包芯纱在相同规格和纺纱条件下纱线的纵向形态、毛羽、强力和条干等相关性能.分析得出结论为转杯纺包芯纱表面光洁,毛羽少,不易起毛起球,强力稍低,条干稍差于Sirofil纱,并分析解释了原因.  相似文献   

5.
长丝牵伸倍数与转杯复合纱结构关系的探讨   总被引:1,自引:1,他引:0  
研究氨纶长丝牵伸倍数对棉氨纶转杯复合纱结构的影响.在改造的FA601A型转杯纺纱机上纺制58 tex(77 dtex)棉氨纶复合纱,测试分析了氨纶丝不同牵伸倍数时的复合纱的结构及包覆效果.结果表明:氨纶丝牵伸倍数为0.2倍时形成包缠纱,氨纶丝牵伸倍数为2.0倍时形成合股纱,氨纶丝牵伸倍数为4.0倍时形成棉氨纶包芯纱,成纱结构的差异是由于氨纶长丝和棉短纤纱之间的张力差异造成的.氨纶丝牵伸倍数大于4.0倍时,棉氨纶转杯纺包芯纱的包覆效果良好.  相似文献   

6.
转杯纺包芯纱与环锭纺包芯纱的性能对比   总被引:1,自引:1,他引:0  
为了了解转杯纺包芯纱的结构与性能特点及其与环锭纺包芯纱的差异,在一定的工艺设备与条件下,分别纺制了61 tex(77 dtex)和39 tex(77 dtex)的转杯纺棉氨包芯纱与环锭纺棉氨包芯纱,对其强伸性能、条干、毛羽和结构进行了测试和对比分析.结果表明:对于相同号数的包芯纱,转杯纺包芯纱的断裂强度和条干CV值均低于环锭纺包芯纱,断裂伸长率较环锭纺包芯纱高,毛羽比环锭纺包芯纱少.两种包芯纱的结构存在差异,转杯纺棉氨包芯纱有部分氨纶长丝外露,而环锭纺包芯纱包覆效果较好.  相似文献   

7.
本文分析了转杯纺成纱强力低于环锭成纱强力的主要原因,并从原料选择,纺前准备及转杯纺工序等方面阐述了提高转杯纱强力应考虑的因素。  相似文献   

8.
分析了转杯纺成纱强力低于环锭纺成纱强力的主要原因。并从原料选择,纺前准备及转杯纺工序等方面阐述了提高转杯纱强力应考虑的因素。  相似文献   

9.
探讨传统环锭纺包芯纱与赛络纺包芯纱的细纱工艺参数优化及芯纱包覆效果、成纱质量对比。细纱工序选择钳口隔距、后区牵伸倍数和捻系数进行三因子三水平正交试验,对条干CV、强力、毛羽等成纱质量指标进行测试,得出条干CV值的优化工艺为:钳口隔距3.5mm,后区牵伸1.39倍,捻系数402。对传统环锭纺包芯纱与赛络纺包芯纱的芯纱包覆效果与成纱质量指标进行对比分析,结果表明:传统环锭纺包芯纱的包覆效果、成纱质量均优于赛络纺包芯纱。认为:无论是纺制传统环锭纺包芯纱还是赛络纺包芯纱,都应控制好芯纱的喂入位置,从而保证良好的芯纱包覆效果。  相似文献   

10.
分析了转杯纺成纱强力低于环成纱强力的主要原因。并从原料选择,纺前准备及转纺工序等方面阐述了提高转杯纱强力应考虑因素。  相似文献   

11.
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.  相似文献   

12.
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.  相似文献   

13.
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.  相似文献   

14.
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.  相似文献   

15.
Capillary electrophoresis (CE) and polarized light microscopy (PLM) were utilized in the detection of the adulteration of locust bean gum with guar gum. For CE analyses, standards of locust bean and guar gums were extracted with 30% CH3CN, removing the residual proteins from the gum matrix. A 8.75 mM NaH2PO4-20.6 mM Na2B4O7 buffer, pH 9, was used to separate these proteins and to identify marker proteins that were present in the guar gum. These markers did not co-migrate with components in the extracts of mechanically processed locust bean gum, and are used as indicators of adulteration. Using PLM with toluidine blue and iodine staining techniques, unadulterated locust bean gum samples were distinguished from mixed samples through the differential staining of components in locust bean versus guar and tara gums. These experiments in the use of CE and PLM provide orthogonal and complementary methods for the verification of 'true' positives and the elimination of 'false' positives.  相似文献   

16.
An investigation is described in which various polyfunctional compounds were applied to wool in attempts to stabilize the temporary improvements in wrinkle-recovery brought about by ‘annealing’. Several reactive systems involving formaldehyde were found to produce the desired permanently improved wrinkle-recovery.  相似文献   

17.
BADGE.2HCl and BFDGE.2HCl were determined in 28 samples of ready-to-drink canned coffee and 18 samples of canned vegetables (10 corn, 5 tomatoes and 3 others), all from the Japanese market. HPLC was used as the principal analytical method and GCMS for confirmation of relevant LC fractions. BADGE.2HCl was found to be present in one canned coffee and five samples of corn, BFDGE.2HCl in four samples of canned tomatoes and in one canned corn. No sample was found which exceeded the 1mg/kg limit of the EU for the BADGE chlorohydrins. However the highest concentration was found for the sum of BFDGE.2HCl and BFDGE.HCl.H2O at a level of 1.5mg/kg. A Beilstein test confirmed that all cans containing foods contaminated with BADGE.2HCl or BFDGE.2HCl had at lest one part coated with a PVC organosol.  相似文献   

18.
19.
A 9% whey protein (WP) isolate solution at pH 7.0 was heat-denatured at 80°C for 30 min. Size-exclusion HPLC showed that native WP formed soluble aggregates after heat-treatment. Additions of CaCl2 (10–40 mM), NaCl (50–400 mM) or glucono-delta-lactone (GDL, 0.4–2.0%, w/v) or hydrolysis by a protease from Bacillus licheniformis caused gelation of the denatured solution at 45°C. Textural parameters, hardness, adhesiveness, and cohesiveness of the gels so formed changed markedly with concentration of added salts or pH by added GDL. Maximum gel hardness occurred at 200 mM NaCl or pH 4.7. Increasing CaCl2 concentration continuously increased gel hardness. Generally, GDL-induced gels were harder than salt-induced gels, and much harder than the protease-induced gel.  相似文献   

20.
《造纸信息》2014,(8):79-79
Ministr y of Industr y and Information Technology confirmed that the main expected targets for energysaving and comprehensive utilization in 2014 are:energy consumption and CO2 emissions per unit of industrial added-value decreases by 4.5%,water consumption per ten thousand Yuan of industrial added-value decreases by7%,comprehensive utilization of industrial solid waste is further improved,and pollution emissions in key industries is markedly reduced.  相似文献   

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