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

Pump buy return on funding could 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 bags was looking for a substitute for the use of 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 move charges required, while also decreasing their costs and bettering worker well being. Yearly savings are so excessive that the return on investment for the pump system can be measured in days.
Seeking another for pricey pre-scented plastic pellets

A global manufacturer of scented plastic garbage baggage was in search of a substitute for the use of pre-scented plastic pellets, which required a devoted silo for every of the 20 obtainable fragrances. The pellets are pneumatically conveyed to every silo from both tanker vehicles or rail automobiles and the producer was experiencing logistical issues related to maintaining the silos stuffed. They additionally had to carry high prices for sustaining the inventory of the pre-scented pellets.
In addition, the heavily concentrated scents had been causing health considerations for the employees who complained of complications. To mitigate this concern, every extruder line was fitted with a vacuum exhaust hood to expel the fumes to the outside. On เกจวัดแรงดัน , these emissions led to complaints from neighbors and citations from the United States Environmental Protection Agency.
The firm was seeking a way to make use of plain plastic pellets and apply scented oil on to the plastic sheet instantly after the extrusion process to scale back costs, logistical challenges, and energy use. They had tried to build such a system in-house but had struggled to attain accuracy and consistency at the low flow rates they required. They decided to seek a pump-based answer that would directly spray fragrance on the warm melted sheet plastic because the in-house resolution could not meet rigorous quality control standards requiring the spray-on scent to precisely match that of pre-scented pellets.
Finding an answer on a tradeshow ground

Design engineers from the plastic bag producer attending the PackExpo present observed a working demonstration of precision gear metering pumps made by Zenith and requested utility experts if the pumps may be a match with their application. After collecting data on the applying, an space manager for the pump manufacturer with intensive expertise in dosing and mixing methods visited the plant to get a firsthand view of present operations and collect additional data.
Working with the pump manufacturer’s design group they developed a system answer using a Zenith B-9000 Series rotary optimistic displacement pump particularly designed for single stream chemical obligation functions. The pump features an correct, repeatable, pulse free flow in a compact design perfect 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 movement and is also thought of to be a positive displacement sort as a result of the displaced quantity is constant and doesn’t range.
Pumping motion is achieved by filling the gear enamel areas and transporting the fluid around 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 move fee can only be adjusted by rising or reducing the speed at which the shaft is rotated. The pump chosen offers precision grinding and lapping processes that end in a precision metering instrument, producing precise, pulse-less, and repeatable fluid flow.
The pumps offer extraordinarily tight working clearances to reduce fluid slip. Manufacturing tolerances on many elements are to +/- 50 millionths of inch with surface finishes as easy as four micro inches or higher. The pumps are supplied with an AC “closed loop” motor pace controller to maintain 0.1 p.c pump pace accuracy.
The Zenith 9000 collection pump is on the market in 11 sizes with capacities starting from .003 to 300 GPH. Wetted components can be found in via hardened 440C sequence chrome steel, specialty handled 316 chrome steel, and top quality software steels such as D2, M2, M4 and CPM-M4 to offer good corrosion and abrasion resistance.
diaphragm seal selected a model with a magnetic drive (mag-drive) sealing choice, which may remove shaft leakage of fluids, rising plant safety and reducing unstable organic compound emissions. The use of a magnetic coupling additionally eliminates downtime due to mechanical seal failures and eliminates the necessity for buffer fluids.
New resolution reduces prices and offers 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 including the scent directly to the luggage after leaving the extruder, the plastic bag manufacturer not solely eliminated the necessity 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 manufacturer bought the primary system and after successful trials, ordered six further techniques. Over the past two years they’ve purchased more than 30 methods, with plans to order more. The manufacturer is also interested in having Zenith conduct annual field 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 investment 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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