Mixing: Skid-Mounted Mixing and Pumping Station
ROSS has recently designed a skid system capable of mixing and pumping low to moderately viscous products. The Model VSL-400 design is a custom conical vessel on a movable skid with a progressive cavity pump rated for 10-30 gal/min.
A 5-hp inverter-duty motor drives a flange-mounted turbine mixer equipped with two axial flow impellers. The 34-in. diam upper blade and 18-in. diam lower blade maintain batch uniformity from start to finish of the pumping sequence. Both mixer and pump are controlled from a NEMA 4 weather-proof control panel, which includes a thermal protection system that disengages the pump motor if a set temperature is exceeded.
Maintenance departments often clean screws wrongly, causing serious and expensive damage.
Brominated flame retardants restrict its use. Most now goes to China, but new recycling processes promise to ‘clean up’ e-waste.
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.