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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 world manufacturer of scented plastic garbage luggage was on the lookout for an different to the usage 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 move charges required, while additionally reducing their prices and improving worker well being. Yearly savings are so high that the return on investment 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 on the lookout for an different selection to the use of pre-scented plastic pellets, which required a dedicated silo for each of the 20 out there fragrances. The pellets are pneumatically conveyed to every silo from either tanker vehicles or rail vehicles and the producer was experiencing logistical points related to maintaining the silos crammed. They additionally had to carry high costs for maintaining the inventory of the pre-scented pellets.
In addition, the heavily concentrated scents had been inflicting health concerns for the workers who complained of headaches. To mitigate this issue, each 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 means to use plain plastic pellets and apply scented oil directly to the plastic sheet immediately after the extrusion course of to scale back prices, logistical challenges, and power use. They had tried to construct such a system in-house however had struggled to realize accuracy and consistency on the low flow charges they required. They determined to hunt a pump-based resolution that would immediately spray fragrance on the good and cozy melted sheet plastic because the in-house answer could not meet rigorous quality management 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 present noticed a working demonstration of precision gear metering pumps made by Zenith and requested utility experts if the pumps could be a match with their application. After accumulating info on the application, an area manager for the pump manufacturer with in depth expertise in dosing and blending systems 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 positive displacement pump particularly designed for single stream chemical responsibility purposes. The pump options an accurate, repeatable, pulse free circulate in a compact design perfect for dosing additives such as colors, flavors, and fragrances.
This sort of pump is defined as rotary as a outcome of the drive shaft is rotated as in comparability with other kinds of pumps using a reciprocating motion and can be thought-about to be a optimistic displacement type as a outcome of the displaced volume is fixed and doesn’t differ.
Pumping motion is achieved by filling the gear enamel spaces and transporting the fluid around 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 move rate can solely be adjusted by increasing or decreasing the velocity at which the shaft is rotated. pressure gauge chosen provides precision grinding and lapping processes that end in a precision metering instrument, producing exact, pulse-less, and repeatable fluid circulate.
The pumps offer extremely tight operating clearances to reduce fluid slip. Manufacturing tolerances on many components are to +/- 50 millionths of inch with surface finishes as smooth as 4 micro inches or better. The pumps are offered with an AC “closed loop” motor speed controller to maintain 0.1 p.c pump pace accuracy.
The Zenith 9000 sequence pump is on the market in eleven sizes with capacities ranging from .003 to 300 GPH. Wetted components are available in via hardened 440C series chrome steel, specialty handled 316 stainless steel, and top quality software steels similar to D2, M2, M4 and CPM-M4 to supply good corrosion and abrasion resistance.
The bag manufacturer selected a model with a magnetic drive (mag-drive) sealing possibility, which may get rid of shaft leakage of fluids, increasing plant security and reducing risky natural compound emissions. The use of a magnetic coupling additionally eliminates downtime because of mechanical seal failures and eliminates the necessity for buffer fluids.
New resolution reduces costs and offers uniform fragrance distribution
The new Zenith pump system gave the scented bag manufacturer a steady, pulse free process, which guarantees equal and uniform perfume distribution. By including the scent directly to the baggage after leaving the extruder, the plastic bag manufacturer not solely eradicated the need to have separate pellet silos for every scent, but additionally eradicated the necessity to vent the fumes that come from the pellets as they journey from the silos to the extruders.
The producer bought the first system and after successful trials, ordered six extra techniques. Over the past two years they have purchased more than 30 systems, with plans to order more. The producer can also be interested in having Zenith conduct annual subject calibrations of every system.
After two years of operation, the producer estimates a yearly savings of roughly $480,000 per skid in operation. With 30 skids now working, the return on funding for each system purchase can be measured in weeks. To date, there have been no odor complaints because the buyer installed the Zenith methods

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