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 producer of scented plastic rubbish luggage was on the lookout for an alternative to 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 rates required, while additionally lowering their costs and bettering employee well being. Yearly financial 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 world manufacturer of scented plastic garbage baggage was on the lookout for a substitute for using 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 vehicles or rail cars and the manufacturer was experiencing logistical issues related to preserving the silos stuffed. They additionally had to carry excessive prices for sustaining the inventory of the pre-scented pellets.
In addition, the closely concentrated scents had been inflicting health issues for the workers who complained of headaches. To mitigate this issue, each 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 company was seeking a means to use plain plastic pellets and apply scented oil directly to the plastic sheet immediately after the extrusion course of to minimize back prices, logistical challenges, and power use. They had tried to build such a system in-house however had struggled to achieve accuracy and consistency at the low circulate charges they required. They decided to seek a pump-based answer that might immediately spray fragrance on the nice and cozy melted sheet plastic because the in-house resolution could not meet rigorous quality management 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 manufacturer attending the PackExpo present observed a working demonstration of precision gear metering pumps made by Zenith and asked utility consultants if the pumps could be a fit with their utility. After amassing info on the application, an space supervisor for the pump manufacturer with in depth experience in dosing and blending methods visited the plant to get a firsthand view of present operations and collect extra data.
Working with the pump manufacturer’s design group they developed a system answer utilizing a Zenith B-9000 Series rotary optimistic displacement pump particularly designed for single stream chemical responsibility purposes. The pump options an correct, repeatable, pulse free move in a compact design perfect for dosing additives such as colors, flavors, and fragrances.
This kind of pump is outlined as rotary as a outcome of the drive shaft is rotated as compared to other forms of pumps utilizing a reciprocating movement and can also be thought-about to be a positive displacement sort as a end result of the displaced quantity is fixed and doesn’t differ.
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 side of the pump. The flow fee can solely be adjusted by growing or decreasing the pace at which the shaft is rotated. The pump chosen provides precision grinding and lapping processes that lead to a precision metering instrument, producing exact, pulse-less, and repeatable fluid move.
The pumps offer extraordinarily tight operating clearances to attenuate fluid slip. Manufacturing tolerances on many parts are to +/- 50 millionths of inch with surface finishes as smooth as four micro inches or better. The pumps are supplied with an AC “closed loop” motor pace controller to maintain 0.1 % pump velocity accuracy.
The Zenith 9000 collection pump is available in eleven sizes with capacities ranging from .003 to 300 GPH. Wetted elements are available in through hardened 440C sequence stainless steel, specialty treated 316 stainless steel, and high quality device steels similar to D2, M2, M4 and CPM-M4 to provide good corrosion and abrasion resistance.
The bag manufacturer selected a model with a magnetic drive (mag-drive) sealing possibility, which might get rid of shaft leakage of fluids, growing plant safety and lowering volatile natural compound emissions. The use of a magnetic coupling additionally eliminates downtime due to 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 producer a continuous, pulse free process, which ensures equal and uniform perfume distribution. By adding เกจวัดแรงดันแก๊สหุงต้ม to the bags after leaving the extruder, the plastic bag producer not solely eradicated the necessity to have separate pellet silos for each scent, but in addition eliminated the want to vent the fumes that come from the pellets as they journey from the silos to the extruders.
The producer purchased the first system and after successful trials, ordered six additional systems. Over the past two years they’ve bought greater than 30 techniques, with plans to order more. The producer can additionally be excited about having Zenith conduct annual subject calibrations of every system.
After two years of operation, the manufacturer estimates a yearly savings of roughly $480,000 per skid in operation. With 30 skids now working, the return on funding for each system buy may be measured in weeks. To date, there have been no odor complaints for the explanation that customer installed the Zenith systems

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