Compounding: Multi-Shaft Mixer in New Size
Aimed at processing medium to high-viscosity materials.
A new 500-gal VersaMix Model VMC-500 multi-shaft mixer from Charles R. Ross & Son Co., Hauppauge, N.Y., is equipped with a custom combination of independently driven agitators. The anchor agitator with helical flights and the screw-auger agitator work in tandem to promote efficient product turnover while bringing air pockets to the surface. Two saw-tooth, high-speed disperser blades impart shear for fast powder wetout and thorough deagglomeration.
This VMC-500 also features air casters for convenient mobility, PLC recipe controls with data-acquisition capabilities, and a purged, explosion-proof operator station.
The Ross VersaMix line is aimed at processing medium to high-viscosity materials of up to several hundred thousand centipoise, including slurries, pastes, gels and suspensions.
Plastics are going “green,” but they will need some help to get there. Biodegradable polymers derived from renewable resources are attracting lots of interest and publicity, but that enthusiasm is counterbalanced by persistent questions of availability, cost, performance, and processability. All these issues are inter-related: Increasing demand will lead to more capacity, which will presumably lead to lower prices. But the foundation is market demand, which ultimately depends on whether biopolymers will have the performance properties and processability to compete with existing non-renewable plastics.
Brominated flame retardants restrict its use. Most now goes to China, but new recycling processes promise to ‘clean up’ e-waste.
Here’s a guide to specifying screws and barrels that will last under conditions that will chew up standard equipment.