Shaw Intermix

In order to test this concept a series of compounds was prepared in a 5 L Shaw Intermix (rubber internal mixer, Mark IV, Kl) with EPDM (Keltan 720 ex-DSM elastomers an amorphous EPDM containing 4.5 wt% of dicyclopentadiene and having a Mooney viscosity ML(1 +4) 125°C of 64 MU 100 phr), N550 carbon black (50 phr), diisododecyl phthalate (10 phr), stearic acid (2 phr), and l,3-bis(tert-butylperoxy-isopropyl)benzene (Perkadox 14/40 MB ex Akzo Nobel 40% active material 6 or 10 phr). A polar co-agent (15 phr) was admixed to the masterbatch on an open mill and compounds were cured for 20 min at 180°C in a rheometer (MDR2000, Alpha Technologies). The maximum torque difference obtained in the rheometer experiments was used as a measure of... 

Other major machines in use in the rubber industry are the Shaw intermix and the Baker-Perkins shear-mix. Both the Banbury-type and the intermix mixers have passed through modifications and refinements at different points in time. Mechanical feeding and direct oil injection in measured doses into the mixing chamber through a separate oil injection port are notable features of modern internal mixers. Higher rotor speeds and, in the Banbury type, the higher ram pressures, are used for speedy output. 

Figure 3, Rotor designs (A) Banbury two-wing design (B) four-wing design (C) Shaw Intermix three-wing design (D) Werner Pfleiderer four-wing design.

J. Equipment and materials used. The machine used for this work was a K2A Shaw Intermix of batch volume 26 litres, which is... 

Whitaker showed that this did not apply to the Shaw Intermix, which has intermeshing rotors he claimed that because of the more positive mixing action with this design of rotor there is, in fact, no problem with slipping at the start of mixing. 

Fig. 5. Examples of rotor designs A, Banbury two-wing B, Banbury four-wing C, Shaw Intermix three-wing D, Werner and Pfieiderer four-wing. The pumping action of the wings is indicated by arrows.

Orlando, FI, 21st-23id Sept. 1999, paper 113 OPERATIONAL CHARACTERISTICS OF THE FARREL SHAW INTERMIX INTERNAL MIXER... 

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