What is an extrusion melt pump?

In Extrusion – sheet/film. The melt pump (or gear pump) is known as an accurate metering device that eliminates surging of the extruder screw, reduces back pressure and increases output of the complete line (up to 20\%).

How does a plastic extrusion machine work?

Plastic extrusion works by melting, processing and re-melting a type of plastic referred to as thermoplastic resins. The resins generally come in a bead or pellet form which allows them to be used in the extrusion machinery. The auger turns and this cause the beads to move forward there the heat melts them.

Why melt pump is used in sheet film extrusion process?

Melt pumps are used to build up constant pressure and ensure constant output. The extruder screw is relieved, this enables a higher output power and increases the flexibility in different applications. Retrofitting of extrusion-lines with melt-pumps leads primarily to a constant throughput.

How do internal gear pumps work?

An internal gear pump moves a fluid by repeatedly enclosing a fixed volume within interlocking gears, transferring it mechanically to deliver a smooth pulse-free flow proportional to the rotational speed of its gears.

How does a melt pump work?

Melt pumps consist of two gears, usually driven by a single motor. The extruder fills the gears from the suction side (see diagram), and the rotating gears discharge the polymer on the other side. By precisely controlling the output of melt it eliminates many of the variables that impact extruder throughput stability.

What is a hydraulic gear pump?

A gear pump uses the meshing of gears to pump fluid by displacement. They are one of the most common types of pumps for hydraulic fluid power applications. Gear pumps are positive displacement (or fixed displacement), meaning they pump a constant amount of fluid for each revolution.

Can metal be extruded?

Metal Extrusion is a metal forming manufacturing process in which a cylindrical billet inside a closed cavity is forced to flow through a die of the desired cross-section. The most commonly extruded materials are Aluminium, Copper, Steel, Magnesium, and Lead.

How does the fluid flow in internal gear pump?

Liquid enters the suction port between the rotor (large exterior gear) and idler (small interior gear) teeth. Liquid travels through the pump between the teeth of the “gear-within-a-gear” principle. The crescent shape divides the liquid and acts as a seal between the suction and discharge ports.

How does a hydraulic pump works?

A hydraulic pump is a mechanical device that converts mechanical power into hydraulic energy. It generates flow with enough power to overcome pressure induced by the load. Secondly, its mechanical action delivers this liquid to the pump outlet and forces it into the hydraulic system.

What is plastic film extrusion?

In its simplest form, the process involves pushing molten polymer through a circular or slot die. This continuous process enables the production of a consistent high quality product to extremely accurate gauge. For most thin gauge films, the film extrusion process takes the form of blown or cast extrusion.