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

Super secret buy return on funding could be measured in days
By Mike Libbey, Area Sales Manager CIRCOR and Bob Limper, Business Development Manager CIRCOR
A world producer of scented plastic garbage bags was looking for a substitute for using pre-scented plastic pellets. A serendipitous encounter at a tradeshow led them to a precision gear metering pump resolution that gave them accuracy and consistency at the low move charges required, whereas additionally lowering their costs and improving employee well being. Yearly savings are so high that the return on funding for the pump system could be measured in days.
Seeking another for expensive pre-scented plastic pellets
A global manufacturer of scented plastic garbage baggage was in search of a substitute for the usage of pre-scented plastic pellets, which required a dedicated silo for each of the 20 out there fragrances. The pellets are pneumatically conveyed to each silo from both tanker vans or rail cars and the manufacturer was experiencing logistical issues related to keeping the silos stuffed. They additionally had to carry excessive costs for maintaining the stock of the pre-scented pellets.
In addition, the closely concentrated scents had been causing well being issues for the employees who complained of complications. To mitigate this problem, each extruder line was fitted with a vacuum exhaust hood to expel the fumes to the outdoors. On event, these emissions led to complaints from neighbors and citations from the United States Environmental Protection Agency.
The company was seeking a method to make use of plain plastic pellets and apply scented oil directly to the plastic sheet instantly after the extrusion course of to reduce prices, logistical challenges, and energy use. They had tried to build such a system in-house however had struggled to achieve accuracy and consistency on the low flow rates they required. They determined to seek a pump-based solution that could immediately spray perfume on the nice and cozy melted sheet plastic as a result of the in-house answer couldn’t meet rigorous quality management requirements requiring the spray-on scent to precisely match that of pre-scented pellets.
Finding a solution on a tradeshow flooring
Design engineers from the plastic bag producer attending the PackExpo present noticed a working demonstration of precision gear metering pumps made by Zenith and requested utility specialists if the pumps could be a match with their application. After collecting information on the application, an space supervisor for the pump manufacturer with in depth expertise in dosing and mixing methods visited the plant to get a firsthand view of present operations and collect additional data.
Working with the pump manufacturer’s design group they developed a system solution using a Zenith B-9000 Series rotary optimistic displacement pump particularly designed for single stream chemical duty purposes. The pump options an correct, repeatable, pulse free circulate in a compact design ideal for dosing components such as colours, flavors, and fragrances.
This sort of pump is defined as rotary as a end result of the drive shaft is rotated as in comparison with other kinds of pumps using a reciprocating motion and is also considered to be a constructive displacement sort because the displaced volume is constant and does not vary.
Pumping motion is achieved by filling the gear teeth 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 aspect of the pump. The circulate price can solely be adjusted by growing or decreasing the speed at which the shaft is rotated. The pump chosen offers precision grinding and lapping processes that end in a precision metering instrument, producing precise, pulse-less, and repeatable fluid flow.
The pumps supply extremely tight working clearances to attenuate fluid slip. Manufacturing tolerances on many elements are to +/- 50 millionths of inch with floor finishes as clean as 4 micro inches or higher. The pumps are provided with an AC “closed loop” motor speed controller to maintain 0.1 p.c pump pace accuracy.
The Zenith 9000 collection pump is out there in eleven sizes with capacities starting from .003 to 300 GPH. Wetted components can be found in through hardened 440C collection chrome steel, specialty handled 316 stainless steel, and top quality software steels corresponding to D2, M2, M4 and CPM-M4 to offer good corrosion and abrasion resistance.
The bag producer selected a model with a magnetic drive (mag-drive) sealing choice, which can get rid of shaft leakage of fluids, growing plant security and decreasing risky organic compound emissions. The use of a magnetic coupling also eliminates downtime because of mechanical seal failures and eliminates the need for buffer fluids.
New resolution reduces prices and offers uniform perfume distribution
The new Zenith pump system gave the scented bag producer a steady, pulse free course of, which guarantees equal and uniform fragrance distribution. By adding the scent on to the baggage after leaving the extruder, the plastic bag producer not solely eradicated the need to have separate pellet silos for every scent, but additionally eliminated the necessity to vent the fumes that come from the pellets as they journey from the silos to the extruders.
The producer purchased the primary system and after successful trials, ordered six extra techniques. Over the previous two years they have purchased greater than 30 techniques, with plans to order extra. The manufacturer is also interested in having Zenith conduct annual subject calibrations of every system.
After two years of operation, the producer estimates a yearly financial savings of approximately $480,000 per skid in operation. With 30 skids now running, the return on investment for each system purchase may be measured in weeks. To date, there have been no odor complaints for the reason that buyer installed the Zenith methods

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