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 international producer of scented plastic garbage bags was on the lookout for an various to 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 move rates required, while additionally reducing their costs and improving employee well being. Yearly financial savings are so high that the return on investment for the pump system could be measured in days.
Seeking an alternative for expensive pre-scented plastic pellets
A international manufacturer of scented plastic rubbish bags was in search of a substitute for using pre-scented plastic pellets, which required a dedicated silo for every of the 20 obtainable fragrances. The pellets are pneumatically conveyed to each silo from both tanker vans or rail automobiles and the producer was experiencing logistical points related to keeping the silos filled. They additionally needed to carry excessive costs for sustaining the stock of the pre-scented pellets.
In addition, the closely concentrated scents had been inflicting well being concerns for the employees who complained of headaches. To mitigate เครื่องมือวัดความดันคือ , every 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 company was in search of a means to make use of plain plastic pellets and apply scented oil on to the plastic sheet immediately after the extrusion process to reduce costs, logistical challenges, and power use. They had tried to build such a system in-house however had struggled to achieve accuracy and consistency on the low circulate rates they required. They determined to seek a pump-based resolution that could immediately spray fragrance on the nice and cozy melted sheet plastic as a outcome of the in-house solution could not meet rigorous high quality control standards requiring the spray-on scent to exactly match that of pre-scented pellets.
Finding a solution on a tradeshow ground
Design engineers from the plastic bag manufacturer attending the PackExpo present noticed a working demonstration of precision gear metering pumps made by Zenith and asked utility experts if the pumps might be a match with their software. After collecting information on the applying, an space manager for the pump producer with intensive experience in dosing and mixing methods visited the plant to get a firsthand view of present operations and collect additional information.
Working with the pump manufacturer’s design group they developed a system resolution using a Zenith B-9000 Series rotary optimistic displacement pump specifically designed for single stream chemical obligation purposes. The pump features an accurate, repeatable, pulse free circulate in a compact design best for dosing additives corresponding to colors, flavors, and fragrances.
This type of pump is outlined as rotary as a outcome of the drive shaft is rotated as in comparability with different forms of pumps using a reciprocating motion and can be thought-about to be a constructive displacement kind because the displaced volume is constant and does not differ.
Pumping motion is achieved by filling the gear tooth 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 rate can only be adjusted by increasing or lowering the velocity at which the shaft is rotated. The pump selected offers 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 working clearances to minimize fluid slip. Manufacturing tolerances on many components are to +/- 50 millionths of inch with surface finishes as easy as four micro inches or better. The pumps are offered with an AC “closed loop” motor speed controller to maintain up zero.1 p.c pump speed accuracy.
The Zenith 9000 collection pump is on the market in 11 sizes with capacities ranging from .003 to 300 GPH. Wetted elements are available in through hardened 440C sequence stainless-steel, specialty handled 316 chrome steel, and prime quality device steels corresponding to D2, M2, M4 and CPM-M4 to offer good corrosion and abrasion resistance.
The bag producer chosen a model with a magnetic drive (mag-drive) sealing option, which may eliminate shaft leakage of fluids, rising plant security and lowering volatile organic compound emissions. The use of a magnetic coupling also eliminates downtime due to mechanical seal failures and eliminates the necessity for buffer fluids.
New resolution reduces prices and provides uniform perfume distribution
The new Zenith pump system gave the scented bag producer a continuous, pulse free course of, which guarantees equal and uniform fragrance distribution. By adding the scent on to the baggage after leaving the extruder, the plastic bag producer not solely eradicated the need 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 extra systems. Over the past two years they’ve purchased greater than 30 techniques, with plans to order more. The manufacturer can be thinking about having Zenith conduct annual field calibrations of each system.
After two years of operation, the manufacturer estimates a yearly financial savings of roughly $480,000 per skid in operation. With 30 skids now operating, the return on funding for every system buy could be measured in weeks. To date, there have been no odor complaints for the rationale that customer installed the Zenith systems

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