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

Pump purchase return on investment can be measured in days
By Mike Libbey, Area Sales Manager CIRCOR and Bob Limper, Business Development Manager CIRCOR
A world manufacturer of scented plastic garbage bags was on the lookout for an alternative selection to the utilization 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 at the low flow charges required, while additionally decreasing their costs and improving employee well being. Yearly savings are so excessive that the return on funding for the pump system may be measured in days.
Seeking an alternative for expensive pre-scented plastic pellets
A world producer of scented plastic garbage luggage was looking for an different alternative to using pre-scented plastic pellets, which required a dedicated silo for every of the 20 obtainable fragrances. เกจวัดแรงดันco2 are pneumatically conveyed to every silo from both tanker vans or rail automobiles and the manufacturer was experiencing logistical issues associated with keeping the silos filled. They also needed to carry excessive costs for sustaining the inventory of the pre-scented pellets.
In addition, the closely concentrated scents had been inflicting health concerns for the employees who complained of complications. To mitigate this problem, each extruder line was fitted with a vacuum exhaust hood to expel the fumes to the outside. 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 method to use plain plastic pellets and apply scented oil directly to the plastic sheet instantly after the extrusion process to reduce prices, logistical challenges, and energy use. They had tried to construct such a system in-house but had struggled to attain accuracy and consistency at the low circulate rates they required. They determined to seek a pump-based solution that might directly spray fragrance on the nice and cozy melted sheet plastic as a result of the in-house resolution couldn’t meet rigorous high quality management requirements 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 asked utility consultants if the pumps might be a match with their software. After amassing data on the applying, an area manager for the pump producer with in depth experience in dosing and mixing techniques visited the plant to get a firsthand view of present operations and gather extra information.
Working with the pump manufacturer’s design group they developed a system answer utilizing a Zenith B-9000 Series rotary constructive displacement pump particularly designed for single stream chemical duty functions. The pump options an accurate, repeatable, pulse free move in a compact design ideal for dosing additives similar to colors, flavors, and fragrances.
This kind 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 can additionally be considered to be a optimistic displacement type as a result of the displaced quantity is fixed and doesn’t differ.
Pumping motion is achieved by filling the gear tooth 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 side of the pump. The flow fee can only be adjusted by growing or reducing the velocity at which the shaft is rotated. The pump chosen presents precision grinding and lapping processes that lead to a precision metering instrument, producing exact, pulse-less, and repeatable fluid circulate.
The pumps offer extraordinarily tight operating clearances to reduce fluid slip. Manufacturing tolerances on many components are to +/- 50 millionths of inch with floor finishes as easy as 4 micro inches or better. The pumps are supplied with an AC “closed loop” motor pace controller to maintain up zero.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 are available in through hardened 440C collection stainless-steel, specialty handled 316 chrome steel, and top quality device steels similar to D2, M2, M4 and CPM-M4 to offer good corrosion and abrasion resistance.
The bag manufacturer selected a model with a magnetic drive (mag-drive) sealing possibility, which can eliminate shaft leakage of fluids, growing plant safety and decreasing volatile natural compound emissions. The use of a magnetic coupling additionally eliminates downtime because of mechanical seal failures and eliminates the need for buffer fluids.
New resolution reduces costs and provides uniform perfume distribution
The new Zenith pump system gave the scented bag producer a steady, pulse free course of, which guarantees equal and uniform fragrance distribution. By including the scent on to the bags after leaving the extruder, the plastic bag manufacturer not only 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 first system and after successful trials, ordered six extra systems. Over the previous two years they’ve purchased greater than 30 methods, with plans to order extra. The producer can additionally be thinking about having Zenith conduct annual field 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 working, the return on investment for each system buy may be measured in weeks. To date, there have been no odor complaints because the buyer put in the Zenith techniques

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