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

Pump buy return on funding could be measured in days
By Mike Libbey, Area Sales Manager CIRCOR and Bob Limper, Business Development Manager CIRCOR
A international manufacturer of scented plastic garbage bags was looking for an alternative to the usage of pre-scented plastic pellets. A serendipitous encounter at a tradeshow led them to a precision gear metering pump answer that gave them accuracy and consistency on the low move charges required, while additionally decreasing their costs and enhancing employee well being. Yearly financial savings are so excessive that the return on funding for the pump system may be measured in days.
Seeking an alternate for expensive pre-scented plastic pellets
A global manufacturer of scented plastic rubbish luggage was on the lookout for an different alternative to the use of pre-scented plastic pellets, which required a devoted silo for every of the 20 available fragrances. The pellets are pneumatically conveyed to every silo from either tanker trucks or rail vehicles and the manufacturer was experiencing logistical points related to preserving the silos filled. They also needed to carry excessive costs for sustaining the stock of the pre-scented pellets.
In addition, the heavily concentrated scents had been inflicting health issues for the employees who complained of complications. To mitigate this concern, each 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 seeking a way to make use of plain plastic pellets and apply scented oil directly to the plastic sheet immediately after the extrusion process to scale back costs, logistical challenges, and energy use. They had tried to build such a system in-house but had struggled to attain accuracy and consistency at the low move rates they required. They decided to seek a pump-based answer that might instantly spray fragrance on the warm melted sheet plastic as a outcome of 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 a solution on a tradeshow flooring
Design engineers from the plastic bag producer attending the PackExpo show observed a working demonstration of precision gear metering pumps made by Zenith and requested software experts if the pumps could be a fit with their utility. After accumulating information on the appliance, an area supervisor for the pump manufacturer with intensive expertise in dosing and blending systems 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 solution using a Zenith B-9000 Series rotary optimistic displacement pump particularly designed for single stream chemical responsibility applications. The pump features an accurate, repeatable, pulse free circulate in a compact design perfect for dosing components such as colours, flavors, and fragrances.
This kind of pump is outlined as rotary because the drive shaft is rotated as compared to different types of pumps using a reciprocating movement and is also considered to be a optimistic displacement kind as a end result of the displaced quantity is constant and doesn’t differ.
Pumping action is achieved by filling the gear teeth areas and transporting the fluid across the outer diameter of the gears. When the gear enamel mesh, the fluid is displaced and compelled to the outlet side of the pump. The move price can only be adjusted by increasing or reducing the velocity at which the shaft is rotated. The pump selected offers precision grinding and lapping processes that result in a precision metering instrument, producing precise, pulse-less, and repeatable fluid flow.
The pumps supply extremely tight working clearances to reduce fluid slip. Manufacturing tolerances on many components are to +/- 50 millionths of inch with floor finishes as clean as four micro inches or higher. The pumps are offered with an AC “closed loop” motor velocity controller to hold up zero.1 percent pump velocity accuracy.
The Zenith 9000 series pump is available in 11 sizes with capacities starting from .003 to 300 GPH. เกจวัดแรงดันไฟฟ้า are available in by way of hardened 440C collection stainless steel, specialty handled 316 chrome steel, and top quality software steels corresponding to D2, M2, M4 and CPM-M4 to supply good corrosion and abrasion resistance.
The bag manufacturer chosen a model with a magnetic drive (mag-drive) sealing possibility, which might remove shaft leakage of fluids, rising plant safety and decreasing volatile natural compound emissions. The use of a magnetic coupling additionally eliminates downtime as a outcome of mechanical seal failures and eliminates the necessity for buffer fluids.
New solution reduces prices and offers uniform fragrance distribution
The new Zenith pump system gave the scented bag producer a steady, pulse free process, which guarantees equal and uniform perfume distribution. By including the scent on to the bags after leaving the extruder, the plastic bag manufacturer not only eliminated the want to have separate pellet silos for each scent, but additionally eradicated the need to vent the fumes that come from the pellets as they travel from the silos to the extruders.
The producer purchased the first system and after successful trials, ordered six extra methods. Over the previous two years they have purchased more than 30 methods, with plans to order more. The manufacturer can be thinking about having Zenith conduct annual subject 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 working, the return on funding for every system purchase may be measured in weeks. To date, there have been no odor complaints since the buyer installed the Zenith methods

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