Sigma blade mixers

Screw-Discharge Batch Mixers A variant of the sigma-blade mixer is now available with an extrusion-discharge screw located in the saddle section. During the mixing cycle the screw moves the material within the reach of the mixing olades, thereby accelerating the... 

Kneadermaster This mixer (Patterson Industries, Inc,) is an adaptation of a sigma-blade mixer for continuous operation. Each two... 

Hah, K. R. and Godfrey, J. C. Trans. Inst. Chem. Eng. 46 (1968) 205. The mixing rales of highly viscous Newtonian and non-Newtonian fluids in a laboratory sigma blade mixer. 

Sigma-blade mixer, in bar soap manufacture, 22 751 Signaling smokes, 5 827, 830 Signal processing in the element (SPRITE), 29 162-163... 

Mixing of the crystalline ingredients of oxidant, fuel elastomer binder (butadiene-2-methyl-5 vinyl-pyridine copolymer plasticized with the formal of diethylene glycol monobutyl ether) 26% by vol is done in a sigma blade mixer. The completed mix is blocked in a hydraulic press to form a chge suitable for extrusion. The extruded strand is cut into grain blanks which are cured at... 

In the manufacture of cellulose ester plastic, the appropriate ester is blended with plasticizer and other additives, such as stabilizers, ultraviolet inhibitors, dyes, and pigments, commonly in a large sigma-blade mixer. The mixture thus obtained is heated to its softening temperature and kneaded until it is homogeneous. This is done on hot milling rolls, in a compounding extruder, or in a Banbury mixer. The molten mass of plastic that results is formed into small rods or strips that are then cut into cylindrical or cubical pellets, which ordinarily have dimensions of about J inch (3 millimeters). See Fig. 2. 

A pilot scale evaluation of a 15 gallon Beken Duplex Mixer for propellant manuf, conducted at PicArsn, indicated that it can be successfully substituted for other mixers, such as a sigma blade mixer... 

Acrylic latex sealants. Basic acrylic latex sealant formulations were compounded in a sigma blade mixer, as shown in Table 3. The water-borne silanes were then incorporated into a base. Standard wet and dry peel adhesion determinations from various substrates were performed periodically in accordance with ASTM C794-8. 

BMC is processed by premix techniques, using the standard sigma-blade mixer. The only change is the use of Group 2a metal oxides and hydroxides. 

Fillers may be added to low-viscosity resins by conventional sigma-blade mixer or the same type of equipment used for mixing paint systems. Three roll mills are generally employed for more viscous systems to obtain thorough wetting of the filler by the resin matrix. 

Salt Attrition. The crude is ground in a ball mill or a double-arm, sigma blade mixer in the presence of a large excess of sodium chloride and an organic solvent such as diethylene glycol or xylene to give the green-shade, beta copper phthalocyanine blue. 

Screw-Discharge Batch Mixers A variant of the sigma-blade mixer has an extrusion-discharge screw located at the center of the... 

In testing an equation which he gives for calculating the theoretical variance of samples taken from a randomly mixed batch of two materials, P and Q, Stange uses data for a laboratory mixer which he refers to as "an older model of the Werner Pfleiderer firm, Stuttgart. This is a sigma-blade mixer, which ordinarily is used for sticky materials rather... 

Figure 5.3 Sigma blade mixer for compounding. Courtesy of Krupp Werner Pfieiderer...

Powder and friction properties are covered in section 3.4. In ASTM D2395 [50] a test is described that measures the ability of PVC polymer to absorb plasticizer whilst remaining a free-flowing powder. The PVC polymer powder is mixed with liquid plasticizer in cither a sigma blade mixer or a planetary mixer heated at 88 C and the torque is continuously recorded by a torque rheometer. The mix passes through a sticky state before becoming dry as the plasticizer is absorbed. The change in motor drive torque with time is used to measure the time taken for this absorbtion. 

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