RPVC挤出低发泡材料延伸性能的研究

本文采用高温拉伸试验方法，系统地的 试验条件及材料组成的ＲＰＶＣ挤出低发泡工艺中ＰＶＣ熔体延伸形变性能的影响。结果表明：在２３￣１９２℃范围内，随着温度的升高，ＰＶＣ材料的伸强度降低，断裂伸长率呈凸凹形变化。     

木纹结皮发泡PVC异型材的挤出

用普通单螺杆挤出机和自制结皮发泡模具,应用不同树脂进行配方工艺试验,结果表明：利用不同材料的流动性差异,并结合模具进行设计,可以挤出木纹效果良好的ＰＶＣ结皮发泡异型材。     

色拉,云纹工艺在PVC发泡挤出中的应用

阐述了应用色拉、云纹工艺制作的仿木纹ＰＶＣ发泡材料的物理特性、生产配料工艺、制作的模具类型以及试验与应用等方面的内容。     

硬PVC异型材的经济快速挤出成型工艺探讨

本文简要分析了目前国内塑料异型材生产企业的产品,设备及技术状况,提出一种比较经济的快速异型挤出成型工艺,并介绍了其生产要点,对该工艺的经济性和可行性进行了论述。     

宽幅硬质聚氯乙烯透明板（片）的挤出生产

一、概述硬质聚氯乙烯(简称R-PVC)是当今世界也是我国通用塑料中的一大门类。由于其具有较好的耐腐蚀性、耐燃性和较好的机械强度,因而在农业排灌、机电、交通、化工、医疗、建筑以及包装等国民经济各部门得到广泛的应用。特别是近几年来,通过引进、消化和吸收世界先进技术,在全国已形     

宽幅硬质PVC板材挤出成型配方及工艺

在引进的生产线上,利用国产原材料,改进配方和工艺条件生产硬质PVC工业用板材的实践。     

硬质PVC门窗异型材的高速挤出

简要介绍了硬质ＰＶＣ门窗异型材高速挤出技术的国内外现状,并对配方、工艺、挤出机、畏机及模具等影响高速挤出的要素作了一定的探讨。     

用锥形双螺杆挤出机生产R—PVC低发泡板材

采用进口锥形双螺杆挤出机生产的硬质聚氯乙烯(R-PVC)低发泡板材,是一种具有发展前途的化学建材产品。本文着重介绍生产原料和工艺技术对制品性能的影响,并相应的提出了可供参考的生产配方和工艺控制参数。     

硬质PVC低发泡管材的成型

本介绍了挤出法生产硬质PVC低发泡管材的成型工艺、设备、及产品性能,并对发泡机理、影响发泡成型的主要因素和原材料的品种规格,成型工艺条件(温度和压力),成型模头及冷却定型装置的设计和选用等,进行了讨论,在料筒温度为40～190℃,模头温度为145～185℃,压力9.81～39.2MPa,转速10～20n/min的工艺条件下,通过挤出、冷却、定型等工序,生产出密度为0.7～0.89g/cm~3,拉伸强度为14.72MPa,泡孔均匀,表面光洁平整的PVC低发泡管材。     

木粉高填充改性聚丙烯再生料的研究

探讨了木粉填充改性、不同的木粉含量、种类以及木粉的预自理处理对聚丙烯再生料的力学发性能及挤出成型的影响。     

往复式压缩机活塞环技改小结

针对ZW-9/30型往复式压缩机活塞环频繁损坏、设备运行周期短的问题,分析其原因,提出相应的技改措施,保证压缩机的正常运行。     

Soy Protein Adhesive Blends with Synthetic Latex on Wood Veneer

Environmental pollution has prompted an interest in and a need for bio-based wood adhesives. Modified soy protein has shown adhesion properties similar to those of formaldehyde based adhesives. The objective of this research was to investigate the compatibility of a modified soy protein (MSP) with six commercial synthetic latex adhesives (SLAs). Four different blending ratios of MSP and SLAs were studied. Adhesion; structural change; and rheological, thermal, and morphological properties of the MSP/SLAs blends were characterized. Dry adhesion strength of MSP, SLAs and their blends were all similar with 100% wood cohesive failure. Water resistance of all six SLAs was improved by blending with MSP in terms of the wet adhesion strength. The wet adhesion strength of MSP/PBG (40/60) blends was 6.416 MPa, as compared to 4.66 MPa of pure PBG (press bond glue, urea formaldehyde based resin). Viscosity of MSP/SLAs blends was reduced significantly and reached the lowest value at 40–60% MSP. Infrared spectra, thermal properties, and morphological images indicated that chemical reactions occurred between soy protein and PBG molecules. The MSP provided some functional groups, such as carboxylic (–COOH), hydroxyl (–OH) and amino groups (–NH₂), that cross-linked with hydroxymethyl groups (–CH₂–OH) of PBG, and also acted as an acidic catalyst for the self-polymerization of urea formaldehyde based resin.     

木塑复合材料用木质材料改性研究进展

综述了木塑复合材料(WPC)用木质材料改性的研究进展,重点介绍了对木质材料的物理和化学改性方法,并对木质材料的改性的发展方向进行了展望。     

Numerical Optimization of the Annual Cost of a Clothes Dryer

Optimization of the energy cost of clothes dryers saves on energy use without requiring additional installations. To optimize the cost of clothes dryers, a correlation has been developed for the evaporative mass flux produced in the drum. The correlation was used to determine the drying time and cost. An objective function for the drying cost was defined in terms of the total annual dryer costs for energy usage, material, and manufacturing. The objective function (Annual cost) was optimized for two cases relative to 8-10 of the dryer parameters subject to various operating constraints using the direct search and the variable metric methods. The optimization results indicate that there are optimum settings for the fan speed and the drum speed depending on the weight of the drying load and heater power. The results showed that the optimum lies at the highest drying load and the lowest (37.45% in Annual cost could be saved) or the highest value of heater power (19.7% in Annual cost and 52.6% in drying time could be saved), whichever satisfies the drying time constraint. The applications of the optimization results are discussed.     

不同形式补强圈对吊装强度影响

针对大型萃取精馏塔,利用有限元方法分析了3种形式的补强圈对其吊装强度的影响,为大型塔设备吊装提供合理方案。     

聚丙烯/木粉复合材料的制备及其力学性能的研究

以聚丙烯为基体,木粉为填料,采用机械共混、二次挤出共混和注塑成型方法制备不同木粉含量的PP/木粉复合材料,并且测定了PP/木粉复合材料的力学性能。实验结果表明:随着木粉用量的增加,复合材料拉伸强度逐渐增大;木粉用量为60%时,复合材料拉伸强度达到最大值36.04 MPa;木粉用量为80%时,复合材料拉伸强度降低到34.60 MPa。木粉的含量由20%增加到80%,复合材料弹性模量由579.12 MPa增加到869.80MPa,断裂伸长率从18.92%降低到7.39%,冲击强度由9.33 kJ/m2降低到7.76 kJ/m2。这是因为PP/木粉复合材料体系中随着木粉含量的增加,木粉起到了应力集中的作用,使材料变脆,冲击强度降低。     

钢领化学镀Ni－P－PTFE工艺实践

提出细纱机钢领化学镀Ｍ—Ｐ—ＰＴＦＥ工艺及其维护管理。Ｎ—Ｐ—ＰＴＦＥ复合镀层具有优良的润滑、耐磨、耐蚀性能，硬度高、摩擦系数小。     

The impact of rheology of human fibronectin-fibrinogen solutions on fibre extrusion for tissue engineering

Fibronectin-fibrinogen composite materials form a basis for natural constructs for applications in soft tissue engineering including skin repair, blood vessel replacement and nerve regeneration. Scaleable methods for the preparation of such scaffolds are a prerequisite for their widespread use. Here, we report data on the extrusion of fibronectin-based constructs in the form of fibres.The results suggested that events occurring in the extrusion head and coagulation bath were critical in determining the ultimate mechanical strength of the extruded fibres. These events were controlled by interaction between the rheology of the dope, the geometry of the extrusion device and the operating parameters of the extrusion process. The rheology of the dope was successfully controlled by incorporation of sodium alginate, and urea was added to the formulation to produce oriented fibres. We previously reported that oriented fibronectin fibres have the capacity to induce desirable cell responses.Measurements indicated that for a given formulation, the mechanical properties and morphological features depended on the diameter of the extruded fibre, the rate of shear in the extrusion pipe and the time of exposure to it.     

The Influence of Organoclay on Polypropylene Composite Films for Synthetic Paper

The influence of type and content of modified montmorillonite (MMT) clay and amount of compatibilizing agent on physical-mechanical properties of polypropylene (PP)/organoclay films were studied. An unexpected decrease in tensile elastic modulus and yield stress was observed, and a striking drop in film density. SEM micrographs showed film microcavitation at polymer/clay interfaces. Experimental design analysis indicated that the most important parameter was the organoclay content: the higher the proportion of MMT, the lower the values of film properties. The addition of compatibilizer promoted an improvement in these film properties, probably due to the formation of less porous film.