Leading the Competition

The VBET screw channel is divided into two sub-channels. The particles continuously change their position as they flow from one sub-channel into another sub-channel along the screw. A particle in the surface layer of one sub-channel ends up in the center layer of the other sub-channel. This Solid/Melt Flow mechanism gives uniform melt quality and uniform melt temperature by continuously mixing the melt. Undesirable hot spots inside the screw channel are eliminated. Sub-Channel A.  Sub-Channel B.

Conduction is the key to the BARR VBET.

The VBET's new low-shear design uses almost half of its length as an Energy Trasfer section, which provides an increase in conductive melting by almost 30%. The VBET Energy Transfer section melts 30-50% of the polymer, eliminating the need for downstream cooling. This not only reduces heat loss, but also, allows a much lower melt temperature. Lower melt temperatures, in turn, mean the processor can facilitate higher maximum rates.
How does the VBET work? Click here to watch a video.

The VBET Difference

Not only has the VBET improved upon the strength of the BARR ET Screw, it incorporates more of the processing power. The Mixing/Melting Section fo the VBET Screw is 30% to 50% longer than the ET Screw. Standard ET Mixing / Melting Section vs. VBET Mixing / Melting Section

Typical Barrier Screw

VBET Screw

Largely keeps unmelted and melted resin separated

90% of polymer melted through shearing

Melt film thickness in barrier section is very small

Requires downstream cooling due to high temperatures

Both pellets and melt cross between channels to increase conductive melting

30 - 50% of polymer melted through conduction

Hot melt flows from one sub-channel into another

Conductive heat transfer elminates need for downstream cooling