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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 international manufacturer of scented plastic rubbish baggage was looking for a substitute for the utilization 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 on the low flow charges required, whereas also lowering their prices and enhancing worker health. Yearly savings are so high that the return on funding for the pump system can be measured in days.
Seeking another for expensive pre-scented plastic pellets

A world producer of scented plastic rubbish baggage was in search of an alternative choice to using pre-scented plastic pellets, which required a dedicated silo for every of the 20 available fragrances. The pellets are pneumatically conveyed to each silo from either tanker vehicles or rail vehicles and the manufacturer was experiencing logistical issues associated with keeping the silos crammed. They additionally had to carry excessive costs for maintaining the inventory of the pre-scented pellets.
In pressure gauge octa , the heavily concentrated scents had been causing health issues for the workers who complained of headaches. To mitigate this problem, each extruder line was fitted with a vacuum exhaust hood to expel the fumes to the outdoors. On occasion, these emissions led to complaints from neighbors and citations from the United States Environmental Protection Agency.
The company was looking for a way to use plain plastic pellets and apply scented oil directly to the plastic sheet immediately after the extrusion process to reduce back prices, logistical challenges, and energy use. They had tried to build such a system in-house however had struggled to achieve accuracy and consistency at the low circulate rates they required. They determined to hunt a pump-based resolution that might immediately spray fragrance on the nice and cozy melted sheet plastic because the in-house resolution could not meet rigorous high quality management standards requiring the spray-on scent to exactly match that of pre-scented pellets.
Finding a solution on a tradeshow floor

Design engineers from the plastic bag manufacturer attending the PackExpo present observed a working demonstration of precision gear metering pumps made by Zenith and asked utility consultants if the pumps may be a match with their application. After accumulating information on the application, an area manager for the pump producer with intensive experience in dosing and mixing methods visited the plant to get a firsthand view of present operations and collect further data.
Working with the pump manufacturer’s design group they developed a system resolution using a Zenith B-9000 Series rotary optimistic displacement pump particularly designed for single stream chemical responsibility applications. 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 outlined as rotary as a result of the drive shaft is rotated as in comparison with other types of pumps using a reciprocating movement and is also considered to be a constructive displacement sort as a result of the displaced volume is fixed and does not vary.
Pumping motion is achieved by filling the gear enamel spaces and transporting the fluid across the outer diameter of the gears. When digital pressure gauge , the fluid is displaced and forced to the outlet side of the pump. The move rate can only be adjusted by growing or decreasing the pace at which the shaft is rotated. The pump selected offers precision grinding and lapping processes that lead to a precision metering instrument, producing exact, pulse-less, and repeatable fluid flow.
The pumps supply extremely tight operating clearances to attenuate fluid slip. Manufacturing tolerances on many parts are to +/- 50 millionths of inch with surface finishes as easy as 4 micro inches or better. The pumps are provided with an AC “closed loop” motor pace controller to maintain 0.1 percent pump pace accuracy.
The Zenith 9000 sequence pump is available in 11 sizes with capacities ranging from .003 to 300 GPH. Wetted components are available in via hardened 440C collection stainless steel, specialty treated 316 stainless steel, and prime quality device steels similar to D2, M2, M4 and CPM-M4 to offer good corrosion and abrasion resistance.
The bag manufacturer selected a mannequin with a magnetic drive (mag-drive) sealing possibility, which might get rid of shaft leakage of fluids, increasing plant safety and lowering unstable natural compound emissions. The use of a magnetic coupling also eliminates downtime because of mechanical seal failures and eliminates the necessity for buffer fluids.
New resolution reduces prices and provides uniform perfume distribution

The new Zenith pump system gave the scented bag producer a steady, pulse free course of, which ensures equal and uniform fragrance distribution. By adding the scent on to the luggage after leaving the extruder, the plastic bag producer not solely eradicated the necessity to have separate pellet silos for every scent, but in addition eradicated the want to vent the fumes that come from the pellets as they travel from the silos to the extruders.
The manufacturer purchased the primary system and after profitable trials, ordered six extra techniques. Over the previous two years they have bought more than 30 techniques, with plans to order extra. The producer is also excited about having Zenith conduct annual field calibrations of each system.
After two years of operation, the manufacturer estimates a yearly financial savings of roughly $480,000 per skid in operation. With 30 skids now operating, the return on investment for every system buy could be measured in weeks. To date, there have been no odor complaints because the customer put in the Zenith techniques


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