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Study on the Characteristics of Macromolecular Chains of Cellulose in Dilute Solutions

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Journal of china textile University(English Edition) 1999年第3期16卷 21-24页

作者：鲁平陈自力田原刘兆峰 china textile Univ Shanghai China

The characteristics of macromolecular chains of cellulose in dilute solutions are discussed. Viscometry was used for the measurement of the intrinsic viscosity [η] of four cellulose samples, which were respectively dissolved in the solvent Tri-ethylenediamine cadmium hydroxide Cadoxen (Cadoxen), Cupriethylenediamine hydroxide(Cuen), iron sodium tartrate complex(EWNN) and N,N-dimethylacetamide(DMAc)with lithium chloride(LiCI, 9% w/w). The intrinsic viscosity of the four solutions decreased in the following manner:[η]DMAc/LiCl>[η]EWNN>[η]Cuen>[η]Cadoxen. The stability of cellulose (Sample α-cellulose) dissolved in solvents Cuen and EWNN was tested by plotting the intrinsic viscosity vs. time. The values of Huggins constant K_H for the cellulose samples dissolved in solvents Cadoxen,Cuen,EWNN and DMAc/LiCl (9% w/w ) were calculated.

关键词： cellulose intrinsic viscosity dilute solutions macromolecular chains .

Testing of Anti-stripping Property of Friction Spun Core Yarn

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Journal of china textile University(English Edition) 1998年第3期15卷 66-69页

作者：丁辛宋允 china textile Univ Shanghai China

Friction spun core yarn has two components: filament core and staple fiber sheath. Under axial rubbing action, the failure mode of the core yarn is the stripping of the sheath from the core. This paper introduces a method to test the anti - stripping property of the core yarn. With a modified Universal Testing Machine, the stripping resistance of friction spun core yarn can be continuously measured. Some factors Influencing the measurements are discussed in detail. The testing results are compared with those from a Y731 Yarn Abrasion Tester and fur - ther confirmed by weaving practice.

关键词： friction spun core yarn anti - stripping property stripping resistance testing.

Effects of Polymerization Conditions on Copolymerization of Acrylonitrile with Maleic Anhydride in Water

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Journal of china textile University(English Edition) 1998年第1期15卷 6-9页

作者：裴玉新王庆瑞沈新元 china textile Univ Shanghai China

A acrylonitrile-maleic anhydride copolymer was pre-pared by precipitation polymerization with（NH4）2S2O8-NaHSO3 as oxidation-reduction initiator in *** effects of polymerization conditions（such as contentof adjustment reagent of molecular weight,concentrationof monomers,reaction time and temperature,ratio ofinitiator to monomer and ratio of reductant to oxidizer inmole）on composition,molecular weight and conversionof the copolymer were *** copolymer wascharacterized with IR and Elementary *** ther-mal property and crystallinity were determined with DTAand WAXD,respectively.

关键词： acrylonitrile copolymerization polymerization condition maleic anhydride oxidation-reduction initia-tor.

SMOOTHING AND CURVE-FITTING OF THE MEASURED DATA OF PLANE CAM PROFILE

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Journal of china textile University(English Edition) 1994年第1期11卷 75-79页

作者：薛元陈明 china textile Univ Shanghai China

The necessary continuity of the second order derivative or curvature of the cam profile has been analyzed. In order to guarantee the smoothness of the cam radius data, a proper method with which it could be possible to revise directly the first and the second order difference coefficients as well as the slope has been proposed. This method, applicable to different cam mechanisms by using a unified formula of correction, possesses the characteristics of simplicity, intuition and precision. Meanwhile, a cubic spline function for fitting the cam profile has also been described.

关键词： cam mechanisms, radius, smoothing, numerical control cam profile, difference coefficient

Configuration and Tension Variation in the Local Catenary Yarn Path

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Journal of china textile University(English Edition) 1998年第1期15卷 49-52页

作者：徐雷麟 china textile Univ Shanghai China

For the local catenary path of yarn in steady motion fre-quently encountered in textile processing,this paper studiesthe mathematical expression of its geometrical configurationand tension variation,as well as the curve inclination angleand its maximum suspending *** final math-ematical equations and graphical curves are all presented indimensionless forms,as they are more general and universalthan dimensional expressions and *** the otherhand,we can also find out the catenary yarn tension fromexperimentally measured geometrical parameters by calcula-tions based on these graphs or mathematical expressions asgiven in the paper.

关键词： yarn tension catenary yarn path slop inclina-tion angle suspending deflection.

CONJUGATE CAM WITH FIVE-BAR LINKAGE MECHANISM FOR RAPIER DRIVE OF FLEXIBLE RAPIER LOOMS

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Journal of china textile University(English Edition) 1997年第4期14卷 71-75页

作者：张建毕丽蕴 china textile Univ Shanghai China

A new type of rapier drive for flexible rapier loom through conjugate cams with five-bar linkage mechanism is raised and analyzed. Two designs suitable for the conversion of 1515-190.5 shuttle looms are given as examp... 详细信息

关键词： rapier loom conjugate cam linkage mechanism

Numerical Method for Heat and Mass Transfer in Air Washer——***-phase Flow in Eliminator

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Journal of china textile University(English Edition) 2000年第2期17卷 77-80页

作者：倪波 china textile Univ Shanghai China

Numerical simulation method is applied in the study oftwo - phase flow dynamics in the eliminator of air wash-er. The carrier phase (air) is treated in Eulerian frame,the water droplets are tracked in the Lagrangian frame.A three - dimensional unsteady two - phase flow model isdeveloped. With the help of FLUENT software, air-stream velocity field and water droplets trajectories havebeen illustrated when their mixture passing through tra-ditional folded eliminator. The result of the simulationcan be used to investigate the mechanism of

关键词： air washer eliminator drop trajectories two -phase flow.

Effect of Processing Conditions on the Compression Elasticity of Three Dimensional Crimp Staple

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Journal of china textile University(English Edition) 2000年第3期17卷 12-15页

作者：庄毅王华平王彪张玉梅 china textile Univ Shanghai China

The multi-hollow three dimensional(3-D)crimp sta-ple were prepared by the non-symmetrical cooling spin-ning *** material properties,spinneret shape,drawing conditions,heat-setting conditions and silicon finishing conditions that influence the compression elasticity of the staple have been *** is found that the compression elasticity of 3-D crimp PET staple is larger than that of 3-D crimp PP *** com-pression elasticity of the 5-hollow staple is much

关键词： three dimensional crimp staple compression elasticity processing conditions.

Analytical Analysis on the Structure of a Typical Fuzzy On - Off Controller

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Journal of china textile University(English Edition) 1999年第1期16卷 20-22页

作者：丁永生任立红邵世煌 china textile Univ Shanghai China

The analytical structure of a typical fuzzy on - off controller that employs three or more triangular Input fuzzy sets, Zadeh fuzzy logic AND operator, fuzzy rules with singleton output fuzzy sets, and the centriod defuzzifier is Investigated in this paper. The analytical expressions of the variable gains of the fuzzy controller are derived. The resulting explicit structure shows that the fuzzy controller is accurately a nonlinear PD - like controller with gains continuously changing with system output in different regions of input space.

关键词： analytical structure fuzzy control Ore - off control PD control.