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

Pump buy return on funding may 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 bags was on the lookout for an various choice to the usage 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 on the low circulate rates required, whereas also decreasing their costs and bettering worker well being. Yearly financial savings are so excessive that the return on funding for the pump system can be measured in days.
Seeking an alternative for expensive pre-scented plastic pellets

A international manufacturer of scented plastic garbage baggage was looking for an alternative to the usage of pre-scented plastic pellets, which required a devoted silo for every of the 20 obtainable fragrances. The pellets are pneumatically conveyed to each silo from both tanker vehicles or rail automobiles and the producer was experiencing logistical issues related to preserving the silos crammed. They additionally had to carry high costs for maintaining the stock of the pre-scented pellets.
In addition, the heavily concentrated scents had been inflicting well being considerations for the employees who complained of headaches. To mitigate this issue, every 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 firm was in search of a way to make use of plain plastic pellets and apply scented oil directly to the plastic sheet instantly after the extrusion course of to minimize back prices, logistical challenges, and energy use. They had tried to construct such a system in-house however had struggled to realize accuracy and consistency on the low circulate charges they required. They determined to hunt a pump-based resolution that might instantly spray perfume on the nice and cozy melted sheet plastic as a result of the in-house resolution could not meet rigorous quality control requirements requiring the spray-on scent to exactly match that of pre-scented pellets.
Finding a solution on a tradeshow floor

Design engineers from the plastic bag manufacturer attending the PackExpo show observed a working demonstration of precision gear metering pumps made by Zenith and asked utility specialists if the pumps might be a fit with their software. After amassing info on the appliance, an space manager for the pump producer with intensive expertise in dosing and mixing techniques visited the plant to get a firsthand view of current operations and gather additional data.
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 duty applications. The pump features an correct, repeatable, pulse free flow in a compact design perfect for dosing components similar to colours, flavors, and fragrances.
This kind of pump is outlined as rotary because the drive shaft is rotated as compared to other kinds of pumps utilizing a reciprocating motion and can be considered to be a positive displacement type because the displaced volume is constant and doesn’t range.
Pumping action is achieved by filling the gear enamel spaces and transporting the fluid around the outer diameter of the gears. When the gear enamel mesh, the fluid is displaced and compelled to the outlet aspect of the pump. The move price can solely be adjusted by rising or reducing the pace at which the shaft is rotated. The pump selected presents precision grinding and lapping processes that end in a precision metering instrument, producing exact, pulse-less, and repeatable fluid move.
The pumps supply extremely tight working clearances to reduce fluid slip. Manufacturing tolerances on many elements are to +/- 50 millionths of inch with surface finishes as easy as four micro inches or better. The pumps are offered with an AC “closed loop” motor pace controller to hold up zero.1 p.c pump velocity accuracy.
The Zenith 9000 series pump is on the market in 11 sizes with capacities ranging from .003 to 300 GPH. Wetted elements can be found in via hardened 440C sequence chrome steel, specialty handled 316 stainless steel, and prime quality software steels similar to D2, M2, M4 and CPM-M4 to offer good corrosion and abrasion resistance.
The bag manufacturer chosen a model with a magnetic drive (mag-drive) sealing possibility, which might get rid of shaft leakage of fluids, increasing plant safety and lowering risky organic compound emissions. The use of a magnetic coupling also eliminates downtime as a end result of mechanical seal failures and eliminates the need for buffer fluids.
เกจวัดแรงดัน reduces costs 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 perfume distribution. By including the scent on to the baggage after leaving the extruder, the plastic bag producer not solely eliminated the necessity to have separate pellet silos for every scent, but in addition eradicated the necessity 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 additional systems. Over the past two years they’ve purchased more than 30 methods, with plans to order extra. The manufacturer can additionally be thinking about having Zenith conduct annual field calibrations of every system.
After two years of operation, the producer 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 because the customer installed the Zenith techniques


Scroll to Top