Melt Pumps 20cc/Rev. and smaller

Up to 20 cc/rev. gear pump packages with drive and controls are provided by Labtech Engineering Co. Ltd.

Optional Gear Pumps for precise controls of layer thickness

The extruders can be equipped with Gear Pumps placed in between the extruder and adaptor pipe to the die. These pumps will ensure a very precise and constant flow at high pressure to the die, enabling higher accuracy of each layer. The pump is driven by a geared AC motor and with programmable inverter for speed control. It has a capacity, which is sufficient to follow the output of the screw extruder. The gear pump is a “volumetric Feeding system” and thus you need to calculate the resin flow in grams per minute for each RPM of the gear pump taking into account the density of the resin. It is thus more difficult to set up than our Hopper weighing system (please see preceding chapter) which actually have at least same precision as with gear pumps.

The gear pump is supplied together with a Pressure and Melt temp sensor and closed loop system to ensure constant feed of the melt to the gear pump. The gear pump controls include digital speed control of the pump as well as a pressure control instrument and a digital melt temperature indicator. The instruments are mounted on the central control panel.

Additionally a pressure transducer can be mounted on the adapter to the die inlet to measure the die pressure.

With this addition, you can measure the pressure at the die which can be useful to make sure you do not get an over pressure in the die due blockage, wrong temperatures etc. The transducer will also stop the extruder in the event that the pressure reaches the maximum pressure the die can handle.

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Typical Mixing Screw for Single Screw Extruders,  30:1, Maddock Mixer and Pineapple Mixer

 

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14042 Iroquois Woods Dr.

Fenton, Michigan 48430