An extrusion operation produces continuous tubing with outside diameter = 2.0 in and inside diameter = 1.7 in. The extruder barrel has a diameter = 4.0 in and length = 10 ft. The screw rotates at 50 rev/min; it has a channel depth = 0.25 in and flight angle = 16. The head pressure has a value of 350 lb/in2 and the viscosity of the polymer melt is 80  10-4 lb-sec/in2 . Under these conditions, what is the production rate in length of tube/min, assuming the extrudate is pulled at a rate that eliminates the effect of die swell (i. e., the tubing has the same OD and ID as the die profile)?

unlike the threaded fasteners which are used to clamp the machine members, power screws are used to transmit power. common applications of power screws are: screw jacks: to lift weight. lead screw of lathe: for axial movement of tool and its precise positioning.

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pseudoscience is a collection of beliefs or practices mistakenly regarded as being based on scientific method.

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