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 on the lookout for an various choice to the use 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 at the low move charges required, while additionally decreasing their costs and improving worker well being. Yearly savings are so excessive that the return on funding for the pump system can be measured in days.
Seeking an alternative for pricey pre-scented plastic pellets
A international producer of scented plastic rubbish baggage was in search of a substitute for the use of pre-scented plastic pellets, which required a dedicated silo for every of the 20 obtainable fragrances. The pellets are pneumatically conveyed to every silo from either tanker vans or rail cars and the producer was experiencing logistical issues associated with maintaining the silos crammed. They also had to carry high prices for sustaining the inventory of the pre-scented pellets.
In addition, the heavily concentrated scents had been causing well being issues 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 occasion, these emissions led to complaints from neighbors and citations from the United States Environmental Protection Agency.
The company was in search of a method to use plain plastic pellets and apply scented oil on to the plastic sheet instantly after the extrusion process to minimize back prices, logistical challenges, and energy use. They had tried to build such a system in-house however had struggled to attain accuracy and consistency at the low flow charges they required. They decided to seek a pump-based answer that would immediately spray perfume on the warm melted sheet plastic because the in-house answer couldn’t meet rigorous quality control 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 software consultants if the pumps could be a match with their utility. After accumulating information on the applying, an space supervisor for the pump manufacturer with intensive experience in dosing and mixing systems 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 solution utilizing a Zenith B-9000 Series rotary constructive displacement pump specifically designed for single stream chemical responsibility purposes. The pump options an correct, repeatable, pulse free flow in a compact design ideal 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 different forms of pumps using a reciprocating movement and can also be considered to be a optimistic displacement kind because the displaced volume is constant and does not range.
Pumping motion is achieved by filling the gear tooth areas and transporting the fluid across the outer diameter of the gears. When the gear tooth mesh, the fluid is displaced and compelled to the outlet facet of the pump. The circulate price can only be adjusted by rising or lowering the pace at which the shaft is rotated. The pump selected provides precision grinding and lapping processes that end in a precision metering instrument, producing precise, pulse-less, and repeatable fluid move.
The pumps offer extremely tight working clearances to minimize fluid slip. Manufacturing tolerances on many parts are to +/- 50 millionths of inch with surface finishes as easy as four micro inches or better. The pumps are supplied with an AC “closed loop” motor velocity controller to take care of zero.1 % pump speed accuracy.
The Zenith 9000 collection pump is on the market in eleven sizes with capacities ranging from .003 to 300 GPH. Extra are available in by way of hardened 440C collection stainless steel, specialty treated 316 chrome steel, and prime quality tool steels such as D2, M2, M4 and CPM-M4 to provide good corrosion and abrasion resistance.
The bag manufacturer selected a mannequin with a magnetic drive (mag-drive) sealing option, which can get rid of shaft leakage of fluids, growing plant security and lowering unstable natural compound emissions. The use of a magnetic coupling also eliminates downtime as a end result of mechanical seal failures and eliminates the necessity for buffer fluids.
New solution reduces costs and offers uniform perfume distribution
The new Zenith pump system gave the scented bag producer a steady, pulse free process, which guarantees equal and uniform fragrance distribution. By adding the scent on to the bags after leaving the extruder, the plastic bag manufacturer not solely eradicated the need to have separate pellet silos for each scent, but also eradicated the necessity to vent the fumes that come from the pellets as they travel from the silos to the extruders.
The producer purchased the primary system and after profitable trials, ordered six additional techniques. Over the past two years they’ve bought greater than 30 systems, with plans to order more. The manufacturer is also thinking about having Zenith conduct annual area calibrations of each system.
After two years of operation, the manufacturer estimates a yearly savings of roughly $480,000 per skid in operation. With 30 skids now running, the return on investment for every system purchase can be measured in weeks. To date, there have been no odor complaints for the rationale that customer installed the Zenith techniques

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