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

Pump buy return on funding 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 rubbish baggage was on the lookout for an various choice 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, whereas also reducing their prices and bettering worker well being. Yearly savings are so excessive that the return on investment for the pump system may be measured in days.
Seeking an alternative for expensive pre-scented plastic pellets
A international manufacturer of scented plastic garbage luggage was looking for a substitute for using pre-scented plastic pellets, which required a devoted silo for each of the 20 out there fragrances. The pellets are pneumatically conveyed to every silo from both tanker trucks or rail cars and the producer was experiencing logistical issues related to preserving the silos crammed. They additionally needed to carry high prices for sustaining the inventory of the pre-scented pellets.
In addition, the closely concentrated scents had been inflicting health concerns for the workers who complained of complications. To mitigate this issue, each extruder line was fitted with a vacuum exhaust hood to expel the fumes to the outdoors. On เครื่องมือวัดpressure , 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 directly to the plastic sheet immediately after the extrusion process to cut back prices, logistical challenges, and energy use. They had tried to build such a system in-house but had struggled to attain accuracy and consistency on the low circulate rates they required. They decided to hunt a pump-based solution that would immediately spray fragrance on the good and cozy melted sheet plastic as a result of the in-house answer 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 flooring
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 application specialists if the pumps could be a match with their software. After amassing info on the applying, an area manager for the pump producer with extensive experience in dosing and blending techniques visited the plant to get a firsthand view of present operations and collect extra information.
Working with the pump manufacturer’s design group they developed a system resolution utilizing a Zenith B-9000 Series rotary positive displacement pump particularly designed for single stream chemical obligation applications. The pump features an accurate, repeatable, pulse free circulate in a compact design best for dosing components corresponding to colors, flavors, and fragrances.
This type of pump is defined as rotary as a end result of the drive shaft is rotated as in comparability with other kinds of pumps using a reciprocating movement and is also thought of to be a constructive displacement sort as a end result of the displaced quantity is constant and doesn’t differ.
Pumping motion is achieved by filling the gear teeth areas and transporting the fluid around the outer diameter of the gears. When the gear tooth mesh, the fluid is displaced and forced to the outlet side of the pump. The flow price can only be adjusted by rising or lowering the pace at which the shaft is rotated. The pump selected offers precision grinding and lapping processes that lead to a precision metering instrument, producing precise, pulse-less, and repeatable fluid move.
The pumps offer extremely tight operating clearances to attenuate fluid slip. Manufacturing tolerances on many parts are to +/- 50 millionths of inch with floor finishes as easy as four micro inches or better. The pumps are offered with an AC “closed loop” motor speed controller to maintain 0.1 % pump velocity accuracy.
The Zenith 9000 series pump is out there in eleven sizes with capacities starting from .003 to 300 GPH. Wetted elements can be found in via hardened 440C collection chrome steel, specialty handled 316 chrome steel, and high quality software steels similar to D2, M2, M4 and CPM-M4 to supply good corrosion and abrasion resistance.
The bag manufacturer chosen a mannequin with a magnetic drive (mag-drive) sealing choice, which might get rid of shaft leakage of fluids, growing plant security and lowering unstable organic compound emissions. The use of a magnetic coupling also eliminates downtime because of mechanical seal failures and eliminates the need for buffer fluids.
New answer reduces costs and provides uniform perfume distribution
The new Zenith pump system gave the scented bag producer a continuous, pulse free process, which guarantees equal and uniform fragrance distribution. By including the scent on to the baggage after leaving the extruder, the plastic bag manufacturer not solely eradicated the want to have separate pellet silos for every scent, but also eradicated the want to vent the fumes that come from the pellets as they journey from the silos to the extruders.
The producer bought the first system and after profitable trials, ordered six extra systems. Over the previous two years they’ve purchased more than 30 systems, with plans to order more. The producer can also be thinking about having Zenith conduct annual subject calibrations of every system.
After two years of operation, the producer estimates a yearly savings of approximately $480,000 per skid in operation. With 30 skids now operating, the return on funding for every system buy may be measured in weeks. To date, there have been no odor complaints because the buyer put in the Zenith systems

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