Precision Gear Metering Pump Provides Scented Plastic Bag Manufacturer Accurate and Consistent Continuous Pulse-Free Process

Pump buy return on funding may be measured in days
By Mike Libbey, Area Sales Manager CIRCOR and Bob Limper, Business Development Manager CIRCOR
A world manufacturer of scented plastic rubbish luggage was looking for an various alternative to the use of pre-scented plastic pellets. A serendipitous encounter at a tradeshow led them to a precision gear metering pump solution that gave them accuracy and consistency at the low circulate charges required, while also decreasing their costs and improving employee health. Yearly financial savings are so high that the return on investment for the pump system may be measured in days.
Seeking an alternate for pricey pre-scented plastic pellets
A world producer of scented plastic garbage luggage was looking for a substitute for the use of pre-scented plastic pellets, which required a devoted silo for each of the 20 available fragrances. The pellets are pneumatically conveyed to every silo from both tanker vehicles or rail automobiles and the producer was experiencing logistical points related to keeping the silos filled. They additionally needed to carry excessive costs for maintaining the inventory of the pre-scented pellets.
In addition, the heavily concentrated scents had been causing health considerations for the employees who complained of complications. To mitigate this issue, every extruder line was fitted with a vacuum exhaust hood to expel the fumes to the outside. On occasion, these emissions led to complaints from neighbors and citations from the United States Environmental Protection Agency.
The firm was in search of a way to make use of plain plastic pellets and apply scented oil directly to the plastic sheet immediately after the extrusion course of to minimize back costs, logistical challenges, and energy use. They had tried to construct such a system in-house however had struggled to realize accuracy and consistency at the low flow charges they required. They decided to seek a pump-based answer that would immediately spray fragrance on the good and cozy melted sheet plastic as a result of the in-house resolution could not meet rigorous high quality control requirements requiring the spray-on scent to exactly match that of pre-scented pellets.
Finding a solution on a tradeshow ground
Design engineers from the plastic bag producer attending the PackExpo show observed a working demonstration of precision gear metering pumps made by Zenith and asked utility specialists if the pumps could be a fit with their software. After amassing information on the applying, an space manager for the pump manufacturer with extensive experience in dosing and blending techniques visited the plant to get a firsthand view of present operations and collect additional information.
Working with the pump manufacturer’s design group they developed a system solution using a Zenith B-9000 Series rotary positive displacement pump particularly designed for single stream chemical responsibility functions. The pump features an accurate, repeatable, pulse free move in a compact design best for dosing additives corresponding to colors, flavors, and fragrances.
This kind of pump is defined as rotary as a end result of the drive shaft is rotated as in comparison with other kinds of pumps utilizing a reciprocating motion and can be considered to be a optimistic displacement type as a outcome of the displaced quantity is fixed and does not range.
Pumping motion is achieved by filling the gear enamel areas and transporting the fluid across the outer diameter of the gears. When the gear enamel mesh, the fluid is displaced and forced to the outlet facet of the pump. The flow rate can only be adjusted by rising or reducing the pace at which the shaft is rotated. The pump selected offers precision grinding and lapping processes that result in a precision metering instrument, producing precise, pulse-less, and repeatable fluid flow.
The pumps offer extraordinarily tight working clearances to reduce fluid slip. Manufacturing tolerances on many components are to +/- 50 millionths of inch with surface finishes as clean as four micro inches or better. The pumps are offered with an AC “closed loop” motor speed controller to maintain 0.1 % pump velocity accuracy.
The Zenith 9000 series pump is available in 11 sizes with capacities ranging from .003 to 300 GPH. Wetted parts can be found in by way of hardened 440C series stainless-steel, specialty handled 316 chrome steel, and high quality tool steels similar to D2, M2, M4 and CPM-M4 to provide good corrosion and abrasion resistance.
The bag manufacturer selected a model with a magnetic drive (mag-drive) sealing option, which might get rid of shaft leakage of fluids, growing plant security and lowering unstable natural compound emissions. The use of a magnetic coupling additionally eliminates downtime because of mechanical seal failures and eliminates the need for buffer fluids.
New resolution reduces costs and offers uniform fragrance distribution
The new Zenith pump system gave the scented bag producer a steady, pulse free process, which guarantees equal and uniform fragrance distribution. By including Plain on to the baggage after leaving the extruder, the plastic bag producer not only eradicated the want to have separate pellet silos for every scent, but additionally eliminated the want to vent the fumes that come from the pellets as they journey from the silos to the extruders.
The manufacturer purchased the first system and after successful trials, ordered six further systems. Over the past two years they’ve bought more than 30 techniques, with plans to order extra. The producer can be thinking about having Zenith conduct annual subject calibrations of each system.
After two years of operation, the manufacturer estimates a yearly savings of roughly $480,000 per skid in operation. With 30 skids now operating, the return on funding for each system buy may be measured in weeks. To How-to , there have been no odor complaints because the customer put in the Zenith systems

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