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

Pump purchase return on funding could be measured in days

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

A global manufacturer 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 solution that gave them accuracy and consistency at the low circulate rates required, whereas also reducing their costs and enhancing worker health. 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 garbage luggage was in search of an different 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 each silo from both tanker vehicles or rail cars and the manufacturer was experiencing logistical points associated with preserving the silos crammed. They also needed to carry high costs for maintaining the stock of the pre-scented pellets.
In addition, the heavily concentrated scents had been causing well being issues for the employees who complained of complications. 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 looking for a way to use 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 power use. They had tried to construct such a system in-house but had struggled to realize accuracy and consistency on the low move rates they required. They decided to hunt a pump-based solution that could instantly spray fragrance on the warm melted sheet plastic as a result of the in-house solution could not meet rigorous quality management standards requiring the spray-on scent to precisely match that of pre-scented pellets.
Finding an answer on a tradeshow flooring

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 could be a fit with their software. After collecting info on the applying, an space supervisor for the pump manufacturer with intensive experience in dosing and mixing methods visited the plant to get a firsthand view of current operations and gather additional information.
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 responsibility functions. The pump options an accurate, repeatable, pulse free flow in a compact design ideal for dosing components similar to colors, flavors, and fragrances.
This sort of pump is outlined as rotary because the drive shaft is rotated as compared to other types of pumps using a reciprocating motion and can also be thought of to be a constructive displacement type as a result of the displaced quantity is constant and doesn’t range.
Pumping motion is achieved by filling the gear tooth areas and transporting the fluid across the outer diameter of the gears. When the gear tooth mesh, the fluid is displaced and compelled to the outlet aspect of the pump. The flow price can solely be adjusted by growing or lowering the pace at which the shaft is rotated. The pump selected offers precision grinding and lapping processes that end in a precision metering instrument, producing precise, pulse-less, and repeatable fluid move.
The pumps offer extremely tight operating clearances to attenuate fluid slip. Manufacturing tolerances on many parts are to +/- 50 millionths of inch with floor finishes as smooth as 4 micro inches or higher. The pumps are provided with an AC “closed loop” motor speed controller to take care of 0.1 percent pump pace accuracy.
The Zenith 9000 collection pump is on the market in eleven sizes with capacities starting from .003 to 300 GPH. Wetted components can be found in via hardened 440C collection chrome steel, specialty treated 316 stainless steel, and prime quality device steels such as D2, M2, M4 and CPM-M4 to offer good corrosion and abrasion resistance.
The bag manufacturer chosen a model with a magnetic drive (mag-drive) sealing option, which can get rid of shaft leakage of fluids, rising plant safety and decreasing unstable natural compound emissions. The use of a magnetic coupling also eliminates downtime due to mechanical seal failures and eliminates the need for buffer fluids.
เกจวัดแรงดันไทวัสดุ reduces prices and offers uniform fragrance distribution

The new Zenith pump system gave the scented bag producer a steady, pulse free course of, which ensures equal and uniform perfume distribution. By including the scent on to the luggage after leaving the extruder, the plastic bag manufacturer not solely eradicated the want to have separate pellet silos for every scent, but also eradicated the need to vent the fumes that come from the pellets as they journey from the silos to the extruders.
The manufacturer bought the primary system and after successful trials, ordered six additional techniques. Over the past two years they have purchased greater than 30 techniques, with plans to order extra. The manufacturer can be interested in having Zenith conduct annual subject calibrations of every system.
After two years of operation, the producer estimates a yearly financial savings of roughly $480,000 per skid in operation. With 30 skids now working, the return on funding for each system buy could be measured in weeks. To date, there have been no odor complaints for the reason that customer installed the Zenith systems


Leave a Comment