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 world producer of scented plastic garbage bags was looking for an alternative to using 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 circulate rates required, whereas additionally lowering their prices and improving worker well being. Yearly เกจวัดแรงดันสูญญากาศ are so high that the return on funding for the pump system may be measured in days.
Seeking another for expensive pre-scented plastic pellets
A international manufacturer of scented plastic rubbish bags was in search of a substitute for the utilization of pre-scented plastic pellets, which required a dedicated silo for every of the 20 obtainable fragrances. The pellets are pneumatically conveyed to each silo from either tanker trucks or rail vehicles and the manufacturer was experiencing logistical issues related to keeping the silos stuffed. They additionally had to carry excessive costs for sustaining the inventory of the pre-scented pellets.
In addition, the heavily concentrated scents had been causing well being concerns for the employees who complained of complications. To mitigate this problem, every 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 seeking a method to use plain plastic pellets and apply scented oil on to the plastic sheet instantly after the extrusion course of to scale back prices, logistical challenges, and energy use. They had tried to build such a system in-house but had struggled to realize accuracy and consistency at the low move charges they required. They decided to hunt a pump-based answer that might instantly spray perfume on the good and cozy melted sheet plastic as a end result of the in-house resolution couldn’t meet rigorous high quality management requirements 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 asked utility experts if the pumps may be a fit with their utility. After collecting information on the applying, an area manager for the pump producer with intensive expertise in dosing and mixing systems visited the plant to get a firsthand view of current operations and collect further information.
Working with the pump manufacturer’s design group they developed a system solution utilizing a Zenith B-9000 Series rotary constructive displacement pump particularly designed for single stream chemical responsibility functions. The pump options an accurate, repeatable, pulse free flow in a compact design ideal for dosing additives corresponding to colors, flavors, and fragrances.
This type of pump is defined as rotary as a outcome of the drive shaft is rotated as in comparison with different forms of pumps using a reciprocating movement and is also thought of to be a constructive displacement kind as a outcome of the displaced quantity is constant and doesn’t vary.
Pumping action is achieved by filling the gear enamel spaces and transporting the fluid around the outer diameter of the gears. When the gear tooth mesh, the fluid is displaced and compelled to the outlet side of the pump. The circulate rate can only be adjusted by increasing or decreasing the velocity at which the shaft is rotated. The pump selected provides precision grinding and lapping processes that lead to a precision metering instrument, producing precise, pulse-less, and repeatable fluid move.
The pumps supply extremely tight operating clearances to minimize fluid slip. Manufacturing tolerances on many components are to +/- 50 millionths of inch with surface finishes as easy as 4 micro inches or higher. The pumps are supplied with an AC “closed loop” motor pace controller to maintain 0.1 p.c pump speed accuracy.
The Zenith 9000 sequence pump is on the market in 11 sizes with capacities starting from .003 to 300 GPH. Wetted parts can be found in by way of hardened 440C series chrome steel, specialty handled 316 chrome steel, and prime quality software steels corresponding 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 may get rid of shaft leakage of fluids, rising 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 answer reduces costs and provides uniform fragrance distribution
The new Zenith pump system gave the scented bag manufacturer a steady, pulse free course of, which guarantees equal and uniform perfume distribution. By adding the scent on to the baggage after leaving the extruder, the plastic bag manufacturer not only eradicated the want to have separate pellet silos for every scent, but also eradicated 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 methods. Over the past two years they’ve purchased more than 30 systems, with plans to order extra. The manufacturer can additionally be interested in having Zenith conduct annual subject calibrations of every system.
After two years of operation, the manufacturer estimates a yearly savings of approximately $480,000 per skid in operation. With 30 skids now operating, the return on investment for every system purchase could be measured in weeks. To date, there have been no odor complaints for the reason that customer put in the Zenith methods

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