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

Pump buy return on investment could be measured in days
By Mike Libbey, Area Sales Manager CIRCOR and Bob Limper, Business Development Manager CIRCOR
A world manufacturer of scented plastic rubbish luggage was looking for an various to the usage of pre-scented plastic pellets. A serendipitous encounter at a tradeshow led them to a precision gear metering pump answer that gave them accuracy and consistency on the low circulate charges required, whereas additionally reducing their costs and enhancing worker health. Yearly financial savings are so excessive that the return on funding for the pump system can be measured in days.
Seeking another for pricey pre-scented plastic pellets
A international manufacturer of scented plastic rubbish luggage was looking for an various alternative to using pre-scented plastic pellets, which required a devoted silo for every of the 20 available fragrances. The pellets are pneumatically conveyed to every silo from both tanker trucks or rail vehicles and the manufacturer was experiencing logistical points related to keeping the silos stuffed. They also needed to carry excessive prices for sustaining the inventory of the pre-scented pellets.
In addition, the closely concentrated scents had been inflicting health considerations for the employees who complained of headaches. To mitigate this issue, 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 looking for 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 minimize back costs, logistical challenges, and power use. They had tried to build such a system in-house but had struggled to achieve accuracy and consistency at the low circulate rates they required. They determined to seek a pump-based resolution that might immediately spray fragrance on the good and cozy melted sheet plastic because the in-house resolution could not meet rigorous high quality control standards requiring the spray-on scent to exactly match that of pre-scented pellets.
Finding an answer on a tradeshow floor
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 specialists if the pumps could be a match with their software. After collecting info on the application, an area supervisor for the pump manufacturer with intensive experience in dosing and blending methods visited the plant to get a firsthand view of current operations and collect further data.
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 obligation purposes. The pump options an accurate, repeatable, pulse free circulate in a compact design perfect for dosing components such as colors, flavors, and fragrances.
This type of pump is defined as rotary because the drive shaft is rotated as compared to other forms of pumps utilizing a reciprocating motion and can be considered to be a positive displacement type because the displaced volume is fixed and does not differ.
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 facet of the pump. The circulate fee can solely be adjusted by increasing or reducing the velocity at which the shaft is rotated. The pump chosen offers precision grinding and lapping processes that lead to a precision metering instrument, producing precise, pulse-less, and repeatable fluid circulate.
The pumps offer extraordinarily tight operating clearances to minimize fluid slip. Manufacturing tolerances on many parts are to +/- 50 millionths of inch with floor finishes as smooth as four micro inches or better. The pumps are offered with an AC “closed loop” motor velocity controller to keep up zero.1 percent pump pace accuracy.
The Zenith 9000 series pump is on the market in eleven sizes with capacities ranging from .003 to 300 GPH. Wetted elements can be found in via hardened 440C sequence chrome steel, specialty handled 316 chrome steel, and top quality device steels similar to D2, M2, M4 and CPM-M4 to provide good corrosion and abrasion resistance.
Confidential chosen a mannequin with a magnetic drive (mag-drive) sealing choice, which may remove shaft leakage of fluids, growing plant security and decreasing risky natural compound emissions. The use of a magnetic coupling additionally eliminates downtime as a end result of mechanical seal failures and eliminates the need for buffer fluids.
New answer reduces prices and presents uniform fragrance distribution
The new Zenith pump system gave the scented bag manufacturer a continuous, pulse free process, 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 eradicated the need to have separate pellet silos for every scent, but in addition eliminated 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 extra techniques. Over the previous two years they have bought more than 30 methods, with plans to order more. The producer can be excited about having Zenith conduct annual field calibrations of each 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 running, the return on funding for every system purchase may 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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