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

Pump purchase 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 garbage bags was in search of an alternative to the usage of pre-scented plastic pellets. A serendipitous encounter at a tradeshow led them to a precision gear metering pump answer that gave them accuracy and consistency on the low circulate rates required, while additionally reducing their prices and bettering employee well being. Yearly financial savings are so excessive that the return on funding for the pump system may be measured in days.
Seeking an alternative for expensive pre-scented plastic pellets
A global manufacturer of scented plastic rubbish bags was on the lookout for an various choice to using pre-scented plastic pellets, which required a dedicated silo for each of the 20 obtainable fragrances. The pellets are pneumatically conveyed to every silo from both tanker vehicles or rail vehicles and the producer was experiencing logistical issues related to preserving the silos stuffed. 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 well being issues for the employees who complained of headaches. To mitigate this concern, 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 firm was in search of a means to make use of plain plastic pellets and apply scented oil on to the plastic sheet instantly after the extrusion course of to reduce costs, logistical challenges, and energy use. They had tried to construct such a system in-house however had struggled to attain accuracy and consistency on the low move rates they required. They determined to seek a pump-based resolution that could directly spray perfume on the warm melted sheet plastic as a outcome of the in-house solution couldn’t meet rigorous high quality control requirements requiring the spray-on scent to exactly match that of pre-scented pellets.
Finding an answer on a tradeshow floor
Design engineers from the plastic bag producer attending the PackExpo show noticed a working demonstration of precision gear metering pumps made by Zenith and asked utility specialists if the pumps may be a match with their utility. After collecting information on the appliance, an space manager for the pump producer with intensive expertise in dosing and mixing techniques visited the plant to get a firsthand view of present operations and collect extra information.
Working with เกจวัดถังแก๊ส ’s design group they developed a system resolution utilizing a Zenith B-9000 Series rotary constructive displacement pump particularly designed for single stream chemical obligation applications. The pump options an accurate, repeatable, pulse free circulate in a compact design ideal for dosing additives such as colours, flavors, and fragrances.
This sort of pump is outlined as rotary as a outcome of the drive shaft is rotated as in comparison with other types of pumps using a reciprocating motion and can be thought of to be a positive displacement type as a result of the displaced volume is fixed and does not vary.
Pumping motion is achieved by filling the gear tooth spaces and transporting the fluid across the outer diameter of the gears. When the gear teeth mesh, the fluid is displaced and compelled to the outlet side of the pump. The flow fee can only be adjusted by growing or decreasing the speed at which the shaft is rotated. The pump chosen presents precision grinding and lapping processes that result in a precision metering instrument, producing exact, pulse-less, and repeatable fluid circulate.
The pumps provide extremely tight operating clearances to minimize fluid slip. Manufacturing tolerances on many parts are to +/- 50 millionths of inch with surface finishes as clean as 4 micro inches or better. The pumps are provided with an AC “closed loop” motor pace controller to maintain 0.1 p.c pump pace accuracy.
The Zenith 9000 series pump is on the market in 11 sizes with capacities ranging from .003 to 300 GPH. Wetted components are available in through hardened 440C sequence stainless steel, specialty handled 316 stainless steel, and high quality software steels corresponding 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 may get rid of shaft leakage of fluids, growing plant security and decreasing 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 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 including the scent on to the bags after leaving the extruder, the plastic bag manufacturer not solely eliminated the want to have separate pellet silos for each scent, but additionally eradicated the need 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 profitable trials, ordered six further techniques. Over the previous two years they have bought more than 30 techniques, with plans to order more. The manufacturer can also be interested in having Zenith conduct annual field 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 running, the return on investment for each system purchase can be measured in weeks. To date, there have been no odor complaints because the buyer installed the Zenith techniques

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