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V-Mixer Screw
(Patent #5,798,077)
The V-Mixer screw design is unique because it is a dispersive and distributive mixing device that is machined near the discharge end of a plasticating screw. The feeding and pumping mechanism is the same as a single flighted screw; however, the melting and mixing effects are superior to a single flighted non-mixing design as well as many other mixers.
The V-Mixer assists in the melting phase by having a shallower root depth, thus delivering a degree of increased shear and melting capability. The homogenizing effect is accomplished by a chaotic mixing action by creating a high shear rate with a side to side (wavy wall) movement of the flow as well as an up and down (wavy root) movement. By controlling these depths of the channels and creating a side to side flow, the V-Mixer yields a superior dispersionary melt quality. This dispersion delivers a more uniform, homogenized melt with minimal temperature differential. The more uniform the polymer, the more consistent the viscosity and hence the potential for consistent repeatable flow through the die or into the mold. The more repeatable the flow, the greater the molecular orientation which determines the physical properties of the component being manufactured.
The V-Mixer is designed for applications where a variety of thermoplastic materials will be processed. The mixer is designed with minimal areas of low velocity pockets which create stagnation, therefore, its color and material change-ability properties are superior. For a great all-around mixer with quick color and material change capability, the V-Mixer is your choice. The overall compression ratio will depend upon the viscosity and shear sensitivity of the polymer.
Advantages
- Process a variety of materials
- Low temperature melt
- Less back pressure required
- Quick color changeability
- No marbling
Rating
When compared to a single stage, general purpose screw of comparative root geometry, the V-Mixer screw delivers a mixing quality of 4-5 times better. |
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