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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 global producer of scented plastic garbage bags was looking for an different selection 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 at the low flow rates required, while additionally decreasing their costs and improving employee health. Yearly financial savings are so excessive that the return on investment for the pump system can be measured in days.
Seeking another for pricey pre-scented plastic pellets
A global producer of scented plastic rubbish luggage was on the lookout for an alternative selection to the usage 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 vehicles or rail automobiles and the manufacturer was experiencing logistical points associated with maintaining the silos filled. They also had to carry excessive costs for maintaining the inventory of the pre-scented pellets.
In addition, the closely concentrated scents had been inflicting health concerns for the employees who complained of headaches. To mitigate this issue, each 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 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 scale back costs, logistical challenges, and vitality use. They had tried to build such a system in-house however had struggled to achieve accuracy and consistency on the low move charges they required. They decided to hunt a pump-based answer that could instantly spray perfume on the good and cozy melted sheet plastic as a end result of the in-house answer couldn’t meet rigorous quality control standards requiring the spray-on scent to precisely match that of pre-scented pellets.
Finding a solution on a tradeshow floor
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 software consultants if the pumps may be a match with their application. After amassing info on the appliance, an space supervisor for the pump manufacturer with extensive experience in dosing and blending techniques visited the plant to get a firsthand view of present operations and gather further data.
Working with the pump manufacturer’s design group they developed a system solution utilizing a Zenith B-9000 Series rotary positive displacement pump particularly designed for single stream chemical responsibility applications. The pump features an correct, repeatable, pulse free circulate in a compact design perfect for dosing additives such as colours, flavors, and fragrances.
เกจวัดแรงดูด of pump is defined as rotary because the drive shaft is rotated as in comparability with different types of pumps using a reciprocating motion and is also thought-about to be a optimistic displacement sort as a end result of the displaced quantity is constant and does not differ.
Pumping motion is achieved by filling the gear enamel 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 circulate rate can solely be adjusted by increasing or lowering the velocity at which the shaft is rotated. The pump selected presents precision grinding and lapping processes that end in a precision metering instrument, producing precise, pulse-less, and repeatable fluid flow.
The pumps supply extraordinarily tight working clearances to reduce fluid slip. Manufacturing tolerances on many parts are to +/- 50 millionths of inch with floor finishes as clean as four micro inches or higher. The pumps are provided with an AC “closed loop” motor speed controller to keep up 0.1 p.c pump pace accuracy.
The Zenith 9000 sequence pump is available in 11 sizes with capacities ranging from .003 to 300 GPH. Wetted parts can be found in by way of hardened 440C sequence stainless-steel, specialty handled 316 stainless steel, and prime quality software steels similar to D2, M2, M4 and CPM-M4 to supply good corrosion and abrasion resistance.
The bag producer selected a model with a magnetic drive (mag-drive) sealing possibility, which might get rid of shaft leakage of fluids, rising plant security and decreasing risky natural compound emissions. The use of a magnetic coupling additionally eliminates downtime because of mechanical seal failures and eliminates the need for buffer fluids.
New answer reduces costs and presents uniform perfume distribution
The new Zenith pump system gave the scented bag manufacturer a continuous, pulse free course of, which guarantees equal and uniform fragrance distribution. By including the scent on to the bags after leaving the extruder, the plastic bag manufacturer not only eradicated the necessity 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 bought the first system and after successful trials, ordered six further techniques. Over the previous two years they have purchased greater than 30 systems, with plans to order more. The producer can additionally be thinking about having Zenith conduct annual field calibrations of every system.
After two years of operation, the producer estimates a yearly savings of roughly $480,000 per skid in operation. With 30 skids now working, the return on funding for each system buy may be measured in weeks. To date, there have been no odor complaints for the rationale that customer put in the Zenith systems
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