Co-rotating intermeshing twin-screw

Fig. 26. Typical mixing elements for a co-rotating intermeshing twin-screw extruder...

Fig. 27. Progressive dispersion of calcium carbonate in polypropylene within a co-rotating intermeshing twin-screw extruder. Filler dispersion is expressed in terms of a mean volume diameter determined by image analysis...

Co-rotating, intermeshing twin screw extruder The Banbury... 

M. Mack, Co-rotating Intermeshing Twin Screw Extruder Berstorff s System, in Plastics Compounding, D. B. Todd, Ed., Hanser, Munich (1998). 

T. W. McCullough and B. T. Hilton, The Extrusion Performance of Co-rotating, Intermeshing Twin Screw Extruder Screw Elements-An Experimental Investigation, SPE ANTEC Tech. Papers, 39, 3372-3379 (1993). 

Intermeshing Co-rotating (or Co-rotating Intermeshing) Twin-Screw Extruder ... 

In addition to a regular co-rotating intermeshing twin-screw extruder system, which is analogous to the above-mentioned twin-screw extruder systems, Japan Steel Works (www.jsw.co.jp) has patented a special modification for a TSE barrel and screw kneading section to enhance the polymer blend qualities, as presented in the following subsections. 

Co-rotating intermeshing twin-screw extruders are currently the most widely used for reactive extrusion. The output of commercial machines can range from a few kilograms to around 100 tonnes per hour. In general, they possess the following features ... 

Table 5.2 Specific energy consumption values for pigment concentrates produced on co-rotating intermeshing twin-screw extruders (adapted from [42]) ...

Performance of EFM attached to a singe-screw extruder, SSE, was evaluated examining its suitability for 1. Dispersion of viscous polymer in low viscosity matrix (where X > 4) 2. Impact-modification of engineering resins 3. Elimination of gel particles from either R-TPO or EVAc reactor powders 4. Dissolution of UHMWPE in HDPE, etc. For comparison, the blends were also pr ared using a co-rotating, intermeshing twin-screw extruder, TSE, equipped with high dispersion screws [42, 43 ]. 

Counterrotating intermeshing twin-screw extmd-ers have the narrowest residence time distribution followed closely by co rotating intermeshing twin-screw extmders. Counter rotating nonintermeshing twin-screw extruders have the broadest residence time distribution. 

As mentioned previously, this section will concentrate on compounding SPS with a co-rotating intermeshing twin-screw extruder. Many of the concepts discussed here are applicable and easily transferable to any style of compounding extruder that might be used to compound SPS formulations. 

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