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The different melt pump designs used in extrusion

In priIn principle, all extruder melt pumps have the same design: two externally toothed gear wheels mate with each other when they rotate (see also ‘The working principle of the melt-x gear pump‘). There are differences when it comes to the gear design itself: helical, spur and herringbone are the most common types. Eprotec uses the helical type as this design is suitable for most applications and ensures a continuous and smooth process. In addition, the helical gear design features less friction and has better self cleaning characteristics.

Hot melt extrusion (HME) is the process of applying heat and pressure to melt a polymer and force it though an orifice in a continuous process. HME is a well known process, developed to produce polymer products of uniform shape and density, and its industrial application dates back to the 1930’s1. It is one of the most widely applied processing technologies in the plastic, rubber and food industries and is used to prepare more than half of all plastic products including bags, films, sheets, tubes, fibers, foams, and pipes2. HME has more recently been applied to the health-care industry3 where it is used to manufacture medical devices and to mix active pharmaceutical ingredients (APIs) with polymers to enhance the API’s bioavailability or prepare precursors for thermoplastic drugeluting devices such as subcutaneous and intraocular implants and intravaginal rings.

The values in the table refer to unidirectional pumps. Reversible pump max pressures are 15% lower than those shown in table. For different working conditions please consult our sales department. T2 type double shaft flange allow the pumps to work in clockwise or anticlockwise rotation obtaining the reversible advantages and maintaining the general data of unidirectional pumps.nciple, all extruder melt pumps have the same design: two externally toothed gear wheels mate with each other when they rotate (see also ‘The working principle of the melt-x gear pump‘). There are differences when it comes to the gear design itself: helical, spur and herringbone are the most common types. Eprotec uses the helical type as this design is suitable for most applications and ensures a continuous and smooth process. In addition, the helical gear design features less friction and has better self cleaning characteristics.

 

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