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

Pump buy return on investment can be measured in days

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

A global producer of scented plastic garbage luggage 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 circulate charges required, while additionally decreasing their prices and bettering employee well being. Yearly savings are so excessive that the return on investment for the pump system may be measured in days.
Seeking an alternative for pricey pre-scented plastic pellets

A international manufacturer of scented plastic garbage luggage was looking for an different 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 each silo from both tanker vans or rail cars and the manufacturer was experiencing logistical points related to maintaining the silos filled. They additionally had to carry excessive prices for sustaining the inventory of the pre-scented pellets.
In addition, the heavily concentrated scents had been causing health considerations for the workers who complained of headaches. To mitigate this concern, every 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 in search of a means to make use of plain plastic pellets and apply scented oil directly to the plastic sheet instantly after the extrusion course of to scale back costs, logistical challenges, and energy use. They had tried to construct such a system in-house but had struggled to achieve accuracy and consistency at the low circulate rates they required. They decided to seek a pump-based answer that might immediately spray perfume on the warm melted sheet plastic as a result of the in-house resolution could not meet rigorous quality control requirements requiring the spray-on scent to precisely 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 asked application specialists if the pumps could be a match with their software. After collecting information on the applying, an space manager for the pump producer with extensive expertise in dosing and mixing techniques visited the plant to get a firsthand view of present operations and collect further information.
Working with the pump manufacturer’s design group they developed a system resolution utilizing a Zenith B-9000 Series rotary optimistic displacement pump particularly designed for single stream chemical duty applications. The pump options an correct, repeatable, pulse free move in a compact design best for dosing components similar to colors, flavors, and fragrances.
This sort of pump is outlined as rotary as a end result of the drive shaft is rotated as in comparability with other forms of pumps using a reciprocating motion and can additionally be considered to be a positive displacement type because the displaced quantity 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 teeth mesh, the fluid is displaced and forced to the outlet aspect of the pump. The move rate can only be adjusted by increasing or decreasing the velocity at which the shaft is rotated. The pump selected offers precision grinding and lapping processes that lead to a precision metering instrument, producing precise, pulse-less, and repeatable fluid flow.
The pumps provide extremely tight operating clearances to reduce fluid slip. Manufacturing tolerances on many components are to +/- 50 millionths of inch with floor finishes as smooth as four micro inches or better. The pumps are provided with an AC “closed loop” motor speed controller to take care of zero.1 p.c pump velocity accuracy.
The Zenith 9000 collection pump is out there in 11 sizes with capacities starting from .003 to 300 GPH. Wetted components are available in by way of hardened 440C series stainless-steel, specialty handled 316 chrome steel, and prime quality software steels corresponding to D2, M2, M4 and CPM-M4 to supply good corrosion and abrasion resistance.
The bag producer chosen a mannequin with a magnetic drive (mag-drive) sealing choice, which may eliminate shaft leakage of fluids, increasing plant security and reducing risky natural compound emissions. The use of a magnetic coupling also eliminates downtime due to mechanical seal failures and eliminates the need for buffer fluids.
New resolution reduces prices and presents uniform fragrance distribution

The new Zenith pump system gave the scented bag producer a steady, pulse free course of, which guarantees equal and uniform perfume distribution. By adding the scent on to the baggage after leaving the extruder, the plastic bag manufacturer not only eradicated the want to have separate pellet silos for each scent, but also eradicated the necessity 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 profitable trials, ordered six extra methods. Over the past two years they’ve bought more than 30 systems, with plans to order extra. The manufacturer is also excited about having Zenith conduct annual area calibrations of every system.
After two years of operation, the producer estimates a yearly savings of roughly $480,000 per skid in operation. With pressure gauge running, the return on funding for every system purchase could be measured in weeks. To date, there have been no odor complaints for the rationale that customer put in the Zenith techniques


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