Quality Inspection for 2 stage gear pump - MED Series Melt Gear Pump – Vowa

Built-in cooling channel makes temperature control more precise and faster
Easier sealing method
Suitable for electric heating and heat medium heating
Melt gear pumps for extrusion systems are referred to as melt pumps, also known as melt metering pumps or extrusion pumps. They can be used in various extrusion industries, such as sheet, plate, pipe, film, pelletizing, wire drawing, cable, Co-extrusion, compounding, precision extrusion and other industries
MED series melt gear pump is a melt gear pump for the extrusion system of thermoplastic materials. Suitable for the extrusion and transportation of thermoplastic high-viscosity polymer melt; generally installed between the exit of the extruder and the die, as a melt metering pump; this series of pump housings have a built-in flow channel, which can be used for cooling or heating medium use.

The main materials that can be conveyed by the melt gear pump are:
Thermoplastic materials and their blends
PET PBT PTT
PA6 PA66 PA12
PE LDPE LLDPE HDPE HMWPE
PP EVA PB
PB PS HIPS ABS SAN
PC PEK PMMA POM
TPU PLA PBS
Rubber and elastomer materials
NR BR CR NBR
IR IIR
SBR HNBR
EPM EPDM
PU TPU
ACM CSM
ECO SI
The application of extrusion pump in single screw extrusion system

The application of extrusion pump in twin screw extrusion system

We provide a complete set of solutions for melt pumps, driving devices, control systems and supporting screen changers and die heads
The main function of the melt pump:
1. Significantly improve the stability of die pressure and improve product quality;
2. It can realize the nearly linear output of the flow, which is easy to control;
3. Increase the extrusion volume and increase the output;
4. Reduce the load of the extruder, save energy and reduce costs.
The main features of the company’s melt gear pump:
1. Very small pressure and flow pulsation, can achieve linear output of flow, suitable for precision extrusion system;
2. Use different structures and material configurations for different working conditions to better meet the individual needs of users;
3. It can be applied to the working conditions of high temperature (350℃), high pressure (40MPa) and high viscosity (40,000Pa•s);
4. Precise structure, high precision and long life.
The main structure of MED series melt gear pump:
Rotor type: helical or spur gear
Heating method: electric heating/heat medium heating
Sealing structure:
■ Dynamic melt seal + packing seal
■ Mechanical seal
■ Dynamic seal with cooling melt

Material configuration of the main structure of the melt gear pump

Main technical features of MED series melt gear pump:
1. Optimized melt flow channel design: eliminate dead corners in the flow channel, reduce polymer residues to a minimum, and improve the quality of products;
2. Optional built-in flow channel: suitable for fluid cooling to adapt to a more accurate and fast temperature control system; it can also be used for heat medium heating;
3. Improved gear parameter design: more precise rotation displacement design makes the output pressure more stable and adapts to precise extrusion conditions;
4. A wide range of applicable viscosity: different sealing methods can be applied to working conditions from low viscosity to extremely high viscosity;
5. A variety of installation methods: to meet the individual needs of users;
6. High-precision manufacturing and excellent heat treatment: more precise and more durable;
Technical data:
Viscosity  ： 1～40000Pa•s（1～40,000,000cP）
Suction side pressure ： 0～30MPa
Discharge side pressure ： 0～40MPa
Differential pressure ： 25MPa 
Temperature ： ≤350℃
Heating ： Electric heating/heating medium channel
The installation structure of melt gear pump:
It is recommended to use a universal coupling to connect the reducer and the melt pump to eliminate the effects of thermal deformation; the melt gear pump is a positive displacement forced delivery pump, and the pump output flow can be adjusted by adjusting the pump speed. It is recommended to use frequency conversion adjustment The speed mode can realize the nearly linear flow output of the gear pump.

Pump size and Technical data

The flow rate of the melt gear pump is related to the working speed, material viscosity, and working pressure. Please consult the manufacturer for specific selection.
The selection needs to provide parameters: 1 flow or output 2 material name 3 material viscosity 4 material corrosivity/toxicity 5 inlet and outlet pressure (pressure difference) 6 operating temperature
In addition, according to the actual situation and requirements of the customer, you can choose the pump casing configuration without flow channel