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

Pump purchase return on funding may be measured in days

By Mike Libbey, Area Sales Manager CIRCOR and Bob Limper, Business Development Manager CIRCOR

A global producer of scented plastic garbage bags was looking for a substitute for 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, whereas also reducing their costs and enhancing employee well being. Yearly financial savings are so high that the return on funding for the pump system can be measured in days.
Seeking an alternate for expensive pre-scented plastic pellets

A world manufacturer of scented plastic rubbish luggage was in search of an different 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 each silo from either tanker vehicles or rail cars and the manufacturer was experiencing logistical issues associated with maintaining the silos stuffed. They also had to carry high prices for sustaining the stock of the pre-scented pellets.
In addition, the closely concentrated scents had been causing well being concerns for the workers who complained of headaches. To mitigate this concern, every 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 means to use plain plastic pellets and apply scented oil on to the plastic sheet instantly after the extrusion course of to minimize back prices, logistical challenges, and vitality use. They had tried to construct such a system in-house however had struggled to attain accuracy and consistency at the low move charges they required. They determined to hunt a pump-based solution that might immediately spray fragrance on the good and cozy melted sheet plastic as a outcome of the in-house answer couldn’t meet rigorous quality control requirements 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 producer attending the PackExpo present noticed a working demonstration of precision gear metering pumps made by Zenith and asked software specialists if the pumps may be a match with their application. After accumulating data on the appliance, an area manager for the pump producer with intensive expertise in dosing and blending methods visited the plant to get a firsthand view of present operations and gather further information.
Working with the pump manufacturer’s design group they developed a system solution utilizing a Zenith B-9000 Series rotary optimistic displacement pump specifically designed for single stream chemical responsibility functions. The pump features an correct, repeatable, pulse free circulate in a compact design ideal for dosing additives similar to colours, flavors, and fragrances.
This sort of pump is outlined as rotary because the drive shaft is rotated as compared to other kinds of pumps utilizing a reciprocating movement and can be considered to be a constructive displacement sort as a result of the displaced quantity is fixed and does not differ.
Pumping motion is achieved by filling the gear tooth areas and transporting the fluid across the outer diameter of the gears. When the gear teeth mesh, the fluid is displaced and forced to the outlet side of the pump. The flow fee 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 supply extraordinarily tight working clearances to attenuate fluid slip. Manufacturing tolerances on many components are to +/- 50 millionths of inch with surface finishes as easy as 4 micro inches or better. The pumps are offered with an AC “closed loop” motor velocity controller to maintain 0.1 percent pump pace accuracy.
The Zenith 9000 collection pump is out there in 11 sizes with capacities starting from .003 to 300 GPH. diaphragm seal can be found in by way of hardened 440C collection chrome steel, specialty handled 316 stainless steel, and top quality device steels such as D2, M2, M4 and CPM-M4 to offer good corrosion and abrasion resistance.
The bag manufacturer selected a model with a magnetic drive (mag-drive) sealing option, which might remove shaft leakage of fluids, increasing plant safety and decreasing volatile natural compound emissions. The use of a magnetic coupling additionally eliminates downtime due to mechanical seal failures and eliminates the necessity for buffer fluids.
New solution reduces prices and offers uniform perfume distribution

The new Zenith pump system gave the scented bag producer a steady, pulse free course of, which ensures equal and uniform fragrance distribution. By including the scent directly to the luggage after leaving the extruder, the plastic bag producer not solely eliminated the necessity to have separate pellet silos for each scent, but also eradicated the want to vent the fumes that come from the pellets as they travel from the silos to the extruders.
The manufacturer purchased the primary system and after profitable trials, ordered six further techniques. Over the past two years they’ve bought more than 30 techniques, with plans to order extra. The manufacturer can additionally be thinking about having Zenith conduct annual subject calibrations of each system.
After ไดอะแฟรม 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 investment for each system buy could be measured in weeks. To date, there have been no odor complaints for the explanation that buyer installed the Zenith techniques


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