Mixed-ability

Internal mixers of various types are produced in a range of sizes such that the appropriate capacity can be achieved for any size of production facility. There are a number of producers of the conventional types of mixer. Some mixers come with special modifications to improve mixing ability and quality. 

Reynolds equation was solved by the finite element method. Fraser et al. [42] performed FEM analysis on a metering screw channel that had slots in the flights. The slots increased the mixing ability of the screw by permitting flow between adjacent channels. 

Construction of a plexiglass scale model for cold flow studies typically occurs after completion of the CFD analysis. Smoke entrained in an air stream is used to empirically confirm the SCR design. Tuning efficiencies of the guide vanes and mixing ability of the static mixers are some of the design qualities confirmed by the cold low model. Figure 17.15 is a picture of an actual model used for commercial scale-up. 

The mixing ability of microfluidic systems was tested using a rotary pump, a circular channel with inputs and outputs that can be peristaltically pumped, opeued, and closed. It was found that after only a few minutes of active mixing (due to pumping), a uniform mixture of particles is obtained that would have taken hours to achieve by diffusion. This is also useful for accelerating diffusion-... 

A category of processing referred to as instantizing can use a combination of recrystallization or a hardening binder as described previously, but may also make use of the fluidized bed s mixing abilities. A surfactant can be uniformly distributed in a bed of powders and improve the dispersibility without altering particle size. A possible disadvantage of this technique is that surfactants may impart some taste to the product. 

The shape of the residence time or cumulative residence time distributions are used when optimizing the mixing ability of a system. Often, this shape is compared to the residence time in an ideal or perfect mixer. Such a mixer is a well stirred tank, as depicted in Fig. 6.51(a). Here, two components, a primary and secondary component, are fed to the tank at a total flow rate Q. The output can be regarded as a flow rate Q with a concentration (1 — Co) of... 

There is more attention paid to examining the distributive mixing abilities of each of the full-channel geometries examined, through marker tracking computational animation (114—116). 

Figure 7.19 shows the dependence of the mixing efficiency (rate) of the IMM single mixer on the flow rate. The increase of the flow rate causes a decrease in the absorption at 352 nm due to I2, which means an increase in the mixing rate. Above a flow rate of 100 ml/h, extremely efficient mixing can be achieved. The mixing efficiency also depends on the size of the channels in the distribution unit. When the flow rate exceeds 50 ml/h, the mixer with 25 tm channels exhibits better mixing ability than that with 40 )J,m channels. 

At the time of the accident, Mr C states he was close to the climbing frame but, as far as he can remember, he was probably looking towards another piece of equipment, the half box. On hearing Rhys fall, Mr C immediately approached him. There were 28 children of similar age and of mixed ability in the class. 

A partial or complete dissolution of the urethane-urea hard blocks of a high glass transition temperature (Tg 200°C) in the SPU soft phase promotes increase in the glass transition temperature of the soft phase of a material. The presence of urethane and urea groups capable of forming H-bonds affects this temperature in a similar way. The amount of these groups in a soft phase rises with increase in the mix ability of soft and hard segments of a block-copolymer. 

In immiscible polymer blends, one polymer is dispersed in the form of domains in the continuous phase of the other. The degree of dispersion depends upon the mixing ability of the polymers, which decreases with an increase in concentration of the other polymer in the blend. Therefore, the quantity of domains and the degree of dispersion in PVC/CPE blends determine the progress of the degradatimi. The evolved HCl partially lags in the bulk sample, due to inefficient diffusion and, consequentially, has a catalytic effect on dehydorchlorination at low level of dehydrochlorination, as well as on the secondary reactions of polyene residues (Mahmood and Quadeer 1994). 

The thermal stability of a particular polymer in the blend depends on possible interactions of the blend components and their degradation products. In immiscible blends, as PVC/CPE, the type of interaction depends on the ratio of the components in the blend and their mixing ability. The interactions of PVC and CPE are confirmed by comparison of experimental TGA curves and TGA curves calculated using the additivity rule. In the temperature range which corresponds to the first degradation step (240-370 °C), PVC/CPE blends were more stable than was calculated (Klaric et al. 2000). 

The poor mixing ability of turbo-blending led to the pigment concentrating around the polymer particles and to the development of transciystalline textures in rotomolded articles. ... 

The distributive mixing ability directly relates the flow of the materials in the mixer. As mentioned, internal mixers operate under starved conditions. A question which needs to be answered is how the rubber is distributed in the mixer. Kim and... 

Miscible Mixable. Describes full mixing of two fluids without dissolution of one into the other. Soluble = dissolves in, miscible = mixes into. The converse, immiscible, refers to a lack of mixing ability, as seen in the case of oil and water. 

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