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

Pump buy return on investment may be measured in days

By Mike Libbey, Area Sales Manager CIRCOR and Bob Limper, Business Development Manager CIRCOR

A international producer of scented plastic rubbish baggage was on the lookout for an alternative alternative to 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 flow rates required, whereas additionally reducing their prices and enhancing worker well being. Yearly financial savings are so excessive that the return on funding for the pump system may be measured in days.
Seeking another for costly pre-scented plastic pellets

A global producer of scented plastic garbage bags was in search of an alternative alternative to using pre-scented plastic pellets, which required a devoted silo for every of the 20 out there fragrances. The pellets are pneumatically conveyed to every silo from either tanker trucks or rail cars and the producer was experiencing logistical points related to preserving 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 inflicting health concerns for the workers 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 firm was looking for a way to make use of plain plastic pellets and apply scented oil directly to the plastic sheet instantly after the extrusion course of to cut back prices, logistical challenges, and vitality use. They had tried to build such a system in-house but had struggled to realize accuracy and consistency on the low flow rates they required. They determined to hunt a pump-based answer that might instantly spray fragrance on the warm melted sheet plastic as a outcome of the in-house resolution could not meet rigorous high quality control standards requiring the spray-on scent to precisely match that of pre-scented pellets.
Finding diaphragm seal 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 requested software consultants if the pumps might be a match with their application. After accumulating information on the application, an space supervisor for the pump producer with intensive expertise in dosing and mixing systems visited the plant to get a firsthand view of present operations and collect extra data.
Working with the pump manufacturer’s design group they developed a system answer utilizing a Zenith B-9000 Series rotary optimistic displacement pump particularly designed for single stream chemical obligation purposes. pressure gauge octa , repeatable, pulse free circulate in a compact design ideal for dosing components such as colors, flavors, and fragrances.
This sort of pump is defined as rotary as a outcome of the drive shaft is rotated as compared to other forms of pumps using a reciprocating movement and is also considered to be a optimistic displacement type as a result of the displaced quantity is constant and does not range.
Pumping action is achieved by filling the gear enamel areas and transporting the fluid around the outer diameter of the gears. When the gear teeth mesh, the fluid is displaced and compelled to the outlet facet of the pump. The move rate can only be adjusted by rising or lowering the speed at which the shaft is rotated. The pump selected presents precision grinding and lapping processes that result in a precision metering instrument, producing precise, pulse-less, and repeatable fluid circulate.
The pumps supply extraordinarily tight operating clearances to attenuate fluid slip. Manufacturing tolerances on many elements are to +/- 50 millionths of inch with surface finishes as smooth as four micro inches or higher. The pumps are offered with an AC “closed loop” motor speed controller to maintain 0.1 percent pump velocity accuracy.
The Zenith 9000 collection pump is out there in 11 sizes with capacities ranging from .003 to 300 GPH. Wetted components can be found in via hardened 440C collection stainless steel, specialty handled 316 stainless-steel, and high quality software steels such as D2, M2, M4 and CPM-M4 to provide good corrosion and abrasion resistance.
The bag producer selected a model with a magnetic drive (mag-drive) sealing possibility, which might get rid of shaft leakage of fluids, growing plant safety and reducing risky natural compound emissions. The use of a magnetic coupling also eliminates downtime because of mechanical seal failures and eliminates the need for buffer fluids.
New answer reduces costs and provides uniform perfume distribution

The new Zenith pump system gave the scented bag producer a continuous, pulse free process, which ensures equal and uniform fragrance distribution. By including the scent on to the baggage after leaving the extruder, the plastic bag manufacturer not only eradicated the necessity to have separate pellet silos for each 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 primary system and after successful trials, ordered six additional methods. Over the previous two years they’ve purchased more than 30 methods, with plans to order extra. The producer can be interested in having Zenith conduct annual area calibrations of each system.
After two years of operation, the producer 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 could be measured in weeks. To date, there have been no odor complaints since the buyer put in the Zenith methods



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