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

Pump purchase return on funding could be measured in days
By Mike Libbey, Area Sales Manager CIRCOR and Bob Limper, Business Development Manager CIRCOR
A global manufacturer of scented plastic garbage baggage 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 resolution that gave them accuracy and consistency on the low move rates required, while also decreasing their costs and bettering employee health. Yearly financial savings are so excessive that the return on funding for the pump system could be measured in days.
Seeking another for pricey pre-scented plastic pellets
A global manufacturer of scented plastic rubbish bags was on the lookout for an various to the utilization of pre-scented plastic pellets, which required a dedicated silo for each of the 20 obtainable fragrances. The pellets are pneumatically conveyed to each silo from both tanker trucks or rail automobiles and the producer was experiencing logistical issues associated with maintaining the silos filled. They also needed to carry high prices for sustaining the inventory of the pre-scented pellets.
In addition, the heavily concentrated scents had been causing well being considerations for the workers 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 occasion, these emissions led to complaints from neighbors and citations from the United States Environmental Protection Agency.
The company was seeking a method to make use of 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 power use. They had tried to construct such a system in-house but had struggled to achieve accuracy and consistency on the low flow rates they required. They decided to seek a pump-based resolution that would directly spray fragrance on the good and cozy melted sheet plastic as a result of the in-house answer could not meet rigorous quality control requirements requiring the spray-on scent to exactly match that of pre-scented pellets.
Finding an answer on a tradeshow ground
Design engineers from the plastic bag producer attending the PackExpo show noticed a working demonstration of precision gear metering pumps made by Zenith and requested application specialists if the pumps might be a fit with their application. After accumulating information on the appliance, an space supervisor for the pump manufacturer with in depth expertise in dosing and mixing systems visited the plant to get a firsthand view of current operations and gather additional info.
Working with the pump manufacturer’s design group they developed a system solution using a Zenith B-9000 Series rotary optimistic displacement pump specifically designed for single stream chemical duty purposes. The pump options an accurate, repeatable, pulse free flow in a compact design ideal for dosing additives such as colours, flavors, and fragrances.
This sort of pump is defined as rotary as a result of the drive shaft is rotated as compared to other types of pumps utilizing a reciprocating motion and can be thought-about to be a optimistic displacement type because the displaced volume is constant and does not range.
Pumping motion is achieved by filling the gear tooth 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 circulate fee can only be adjusted by increasing or reducing the pace 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 circulate.
The pumps provide extraordinarily tight operating clearances to minimize fluid slip. Manufacturing tolerances on many components are to +/- 50 millionths of inch with floor finishes as clean as 4 micro inches or higher. The pumps are provided with an AC “closed loop” motor velocity controller to take care of zero.1 p.c pump speed accuracy.
The Zenith 9000 series pump is on the market in eleven sizes with capacities ranging from .003 to 300 GPH. Wetted components can be found in via hardened 440C sequence chrome steel, specialty treated 316 stainless-steel, and top quality device steels corresponding to D2, M2, M4 and CPM-M4 to supply good corrosion and abrasion resistance.
ตัววัดแรงดันน้ำมัน chosen a model with a magnetic drive (mag-drive) sealing possibility, which may remove shaft leakage of fluids, increasing plant safety and lowering risky natural compound emissions. The use of a magnetic coupling also eliminates downtime due to mechanical seal failures and eliminates the necessity for buffer fluids.
New resolution reduces prices and provides uniform perfume distribution
The new Zenith pump system gave the scented bag manufacturer a steady, pulse free course of, which ensures equal and uniform fragrance distribution. By including the scent on to the baggage after leaving the extruder, the plastic bag manufacturer not only eradicated the need to have separate pellet silos for every scent, but also eliminated the need to vent the fumes that come from the pellets as they travel from the silos to the extruders.
The manufacturer purchased the first system and after profitable trials, ordered six additional methods. Over the previous two years they have bought more than 30 methods, with plans to order extra. The producer can additionally 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 approximately $480,000 per skid in operation. With 30 skids now running, the return on funding for each system buy may be measured in weeks. To date, there have been no odor complaints since the buyer put in the Zenith methods

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