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EXTRUDER DIES

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  EXTRUDER DIES Extruder Sheet and Cast Film The convention between cast film and sheet is that film is less than 0.01 inch thick and sheet is more than 0.01 inch thick. The key components in a sheet/film extrusion line are: die, three-roll stack or cooling rolls, puller or nip rolls, and windup or sheet stacking system. The sheet die should uniformly distribute the polymer melt across the  entire die width. This is to provide a uniform melt thickness and polymer flow to the three-roll stack. Die width typically range from approximately 24-120 inches (0.6-3 meters. Cast film/sheet is produced using a multiple roll stack. Depending on the thickness, film is wound in continuous rolls and sheet is cut to length and stacked. The die is designed to fit between the rolls in a three-roll stack and lay the sheet down on the roll. Roll diameters generally range between 8 and 16 inches. Roll stack designs are simple 'up' or 'down' stacks to control the entry and exit angle and th...
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FLUID MACHINES

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 Fluid Machines The machine that either add energy to the fluid or extract energy from fluid are called fluid machines. They are classified into two categories Positive displacement machine Turbomachines or dynamic machines POSITIVE DISPLACEMENT MACHINE:- are those machine in which energy transfer is accompolished by volume changes that takes place due to movement of the boundaries in which the fluid is confined. TURBOMACHINES:- Fluid device which direct the flow with blades or vanes attached to a rotating member are termed as dynamic or turbo machine. Eg Francis turbine, Centrifugal pump etc Each of these two category or sub classification as pumps and turbines                 Pump are those machine which add energy to the fluid                 Turbines are those machines which extract energy from the fluid Some example of positive displacement pump are Reciprocating...
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POWDER METALLURGY

 POWDER METALLURGY Definition:- What does Powder Metallurgy (PM) mean? Powder metallurgy (PM) is a process for forming metal parts by heating compacted metal powders to just below their melting points. In other words PM is metal shaping process that creates near-net parts from powdered metal. Powder metallurgy is the process of blending fine powdered materials pressing them into desired shape or form (compacting), and then heating the compressed material in a controlled atmosphere to bond the material (sintering). The powder metallurgy process consists of four basic steps. Powder manufacture Powder blending  Compacting Sintering Advantages The PM process provides a host of advantages over competing metalworking technologies moluding. Cost effectiveness Shape and material versatility Application versatility Part-to-part uniformity Virtually unlimited choice of alloys and non metallics with associated properties A variety of metal or non metal powders can be used. Refractory mat...
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