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     BURRELL -SEVERS
        EXTRUSION RHEOMETER 
           MODEL A-120
                   Catalog No. 73-851-20                                                  

 


The Burrell-Severs Extrusion Rheometer determines the rheological properties of substances that will flow at room temperature with the application of pressure from 0 to 100psi,
in a viscosity range of  1 to 1-million centipoises.

The instrument can be used for production control or quality control as well as for the determination of fundamental data.  

 

  

        

OPERATION APPLICATIONS
Under test conditions , a series of extrusions is made
through a calibrated orifice into containers at geometrically increasing pressures eg (5,10,20,40,80psi).  Nitrogen, from a commercial cylinder, is utilized to create the pressure. The rate of flow in cubic centimeters per second is 
calculated from the density, weight and the elapsed time of each extrusion.  The viscosity in poises, the rate of shear and the shear stress are derived with  formulas provided in the Operating Manual.  Observed and measured values are used for applied pressure, radius, length of orifice, and the volume of the material extruded.  Graphic curves may be drawn which will show the working properties of a material under different rates of shear and stress.  

DESCRIPTION
The Model A-120 Extrusion Rheometer includes one orifice, approximately 0.30 cm ID, 100 paper weighing cups, spatula, cleaning brush and scraper. (Does not include filler tube )
Model A-120  Catalog number        73-851-20

Orifice size 15 - 5 cm long X 0.15cm
 ID                   Catalog number        73-851-56

Orifice size 30 - 5 cm long X 0.30cm
ID                    Catalog Number       73-851-57

Orifice size 60 - 5 cm long X 0.60cm
ID                     Catalog Number       73-851-58

Equipment Recommended:
Stopwatch for Extrusion timing         78-722-00
Balance for Extrusion weighing         03-423-00

 


           

 

 

DIMENSIONS AND WEIGHT
20 5/8 inches high X 14 inches wide X 11 inches deep.  Weight 40 pounds (including filler tube )
The Burrell-Severs Extrusion Rheometer Model A-120 is used by formulators, manufacturers, and consumers of polymers, lubricants and similar products including plastics, cosmetics, soaps, waxes, sealants, inks, asphalts, mastics, adhesives, plastisols, foods, biological fluids and paints. 

FEATURES
The front panel of the metal case houses a stainless steel sample cylinder, two pressure gages and a three-way, quick acting, push-pull valve.  The small gage indicates the line pressure up to 200psi, and the large gage, calibrated in one-pound increments to 100psi, shows the pressure applied to the sample.  The push-pull valve directs the gas into the cylinder and relieves the pressure at the end of the extrusion interval. 

A pressure regulator, on the right side, permits rapid adjustment and control of the pressure in the cylinder.  The filler tube (optional) is mounted on the left.  The gas pressure tank, preferably nitrogen, is attached by means of a 1/4-inch tube connection in the rear of the case.

There are three stainless steel orifices , 0.15, 0.30, 0.60 cm diameter, to accommodate materials of different viscosities.  The top connector plate has a quick-acting connector for the flexible tube used to apply pressure on the sample.  Caps are threaded and have cork gaskets for sealing.

FILLER TUBE
The Filler Tube is an accessory available for charging the sample cylinder with materials that do not flow readily at room temperature such as cup grease or putty.  The assembly includes a stainless steel tube sized to slid into the sample cylinder, a handle and follower plug.  The end of the tube is pushed into the test material and the tube is evacuated to withdraw a sample.  ( The vacuum from a water aspirator is usually adequate). The filler tube is then inserted into the sample cylinder and gas pressure is applied to discharge the sample.  The follower- plug rides on top of the charge in the filler tube and distributes the pressure evenly over the surface to prevent channeling and voids.  The filler tube kit is shipped with clamps for easy mounting on the left side of the case.   Catalog Number   73-851-21  
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