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

Pump buy return on investment may be measured in days
By Mike Libbey, Area Sales Manager CIRCOR and Bob Limper, Business Development Manager CIRCOR
A world producer of scented plastic rubbish luggage was on the lookout for a substitute for the utilization of pre-scented plastic pellets. A serendipitous encounter at a tradeshow led them to a precision gear metering pump resolution that gave them accuracy and consistency at the low move rates required, whereas additionally reducing their costs and bettering employee health. Yearly financial savings are so excessive that the return on funding for the pump system may be measured in days.
Seeking another for pricey pre-scented plastic pellets
A international manufacturer of scented plastic rubbish baggage was in search of an alternative to the usage of pre-scented plastic pellets, which required a dedicated silo for every of the 20 available fragrances. The pellets are pneumatically conveyed to every silo from both tanker trucks or rail cars and the producer was experiencing logistical issues associated with maintaining the silos stuffed. They also had to carry excessive prices for maintaining the stock of the pre-scented pellets.
In addition, the heavily concentrated scents had been inflicting health issues for the employees who complained of headaches. To mitigate this concern, 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 firm was looking for a method to use plain plastic pellets and apply scented oil directly to the plastic sheet immediately after the extrusion course of to reduce prices, logistical challenges, and energy use. They had tried to build such a system in-house however had struggled to realize accuracy and consistency on the low flow rates they required. They decided to seek a pump-based resolution that might immediately spray perfume on the warm melted sheet plastic as a outcome of the in-house answer couldn’t meet rigorous quality management standards requiring the spray-on scent to exactly match that of pre-scented pellets.
Finding a solution on a tradeshow flooring
Design engineers from the plastic bag producer attending the PackExpo show noticed a working demonstration of precision gear metering pumps made by Zenith and asked application experts if the pumps might be a fit with their utility. After accumulating info on the appliance, an area manager for the pump manufacturer with intensive expertise in dosing and mixing techniques visited the plant to get a firsthand view of present operations and collect additional data.
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 responsibility applications. The pump options an accurate, repeatable, pulse free move in a compact design perfect for dosing additives such as colors, flavors, and fragrances.
This type of pump is defined as rotary because the drive shaft is rotated as in comparability with different forms of pumps utilizing a reciprocating movement and is also thought of to be a positive displacement sort as a outcome of the displaced quantity is constant and doesn’t range.
Pumping motion is achieved by filling the gear teeth spaces and transporting the fluid across the outer diameter of the gears. When the gear teeth mesh, the fluid is displaced and compelled to the outlet side of the pump. The move price can solely be adjusted by increasing or reducing the speed at which the shaft is rotated. The pump chosen provides precision grinding and lapping processes that result in a precision metering instrument, producing exact, pulse-less, and repeatable fluid circulate.
The pumps provide extremely tight working clearances to reduce fluid slip. Manufacturing tolerances on many components are to +/- 50 millionths of inch with floor finishes as smooth as 4 micro inches or higher. เกจวัดแรงกด are provided with an AC “closed loop” motor velocity controller to maintain 0.1 percent pump speed accuracy.
The Zenith 9000 collection pump is available in eleven sizes with capacities starting from .003 to 300 GPH. Wetted parts can be found in by way of hardened 440C collection chrome steel, specialty treated 316 chrome steel, and prime quality device steels such as 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, rising plant safety and reducing volatile organic compound emissions. The use of a magnetic coupling additionally eliminates downtime due to mechanical seal failures and eliminates the necessity for buffer fluids.
New answer reduces prices and offers uniform perfume distribution
The new Zenith pump system gave the scented bag manufacturer a continuous, 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 producer not solely eradicated the want to have separate pellet silos for each scent, but additionally 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 primary system and after profitable trials, ordered six additional techniques. Over the past two years they have bought greater than 30 techniques, with plans to order more. The manufacturer can also be interested in having Zenith conduct annual area calibrations of every 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 investment for each system buy can be measured in weeks. To date, there have been no odor complaints since the customer installed the Zenith techniques

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