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 international manufacturer of scented plastic rubbish luggage was in search of an various to 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 on the low flow charges required, whereas additionally lowering their prices and bettering worker health. Yearly savings are so excessive that the return on funding for the pump system may be measured in days.
Seeking another for costly pre-scented plastic pellets
A global manufacturer of scented plastic garbage bags was on the lookout for an alternative alternative to using pre-scented plastic pellets, which required a dedicated silo for each of the 20 available fragrances. The pellets are pneumatically conveyed to every silo from both tanker trucks or rail automobiles and the manufacturer was experiencing logistical points associated with preserving the silos filled. They additionally needed to carry excessive prices for sustaining the inventory of the pre-scented pellets.
In addition, the heavily concentrated scents had been inflicting health concerns for the workers 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 event, these emissions led to complaints from neighbors and citations from the United States Environmental Protection Agency.
เครื่องมือวัดpressure was looking for a method to use plain plastic pellets and apply scented oil on to the plastic sheet immediately after the extrusion course of to reduce prices, logistical challenges, and vitality use. They had tried to construct such a system in-house however had struggled to realize accuracy and consistency at the low flow rates they required. They determined to hunt a pump-based resolution that would instantly spray perfume on the nice and cozy melted sheet plastic as a outcome of the in-house answer couldn’t meet rigorous high quality control standards 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 present observed a working demonstration of precision gear metering pumps made by Zenith and requested utility experts if the pumps might be a fit with their application. After collecting information on the applying, an area manager for the pump manufacturer with in depth experience in dosing and mixing methods visited the plant to get a firsthand view of present operations and collect further data.
Working with the pump manufacturer’s design group they developed a system answer utilizing a Zenith B-9000 Series rotary optimistic displacement pump specifically designed for single stream chemical obligation purposes. The pump features an accurate, repeatable, pulse free circulate in a compact design best for dosing components similar to colors, flavors, and fragrances.
This kind of pump is defined as rotary because the drive shaft is rotated as in comparability with other kinds of pumps utilizing a reciprocating movement and can be thought-about to be a constructive displacement sort because the displaced quantity is constant and doesn’t differ.
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 side of the pump. The flow fee can solely be adjusted by rising or decreasing the velocity at which the shaft is rotated. The pump selected offers precision grinding and lapping processes that result in a precision metering instrument, producing exact, pulse-less, and repeatable fluid circulate.
The pumps provide extraordinarily tight working clearances to attenuate fluid slip. Manufacturing tolerances on many parts are to +/- 50 millionths of inch with surface finishes as easy as four micro inches or higher. The pumps are supplied with an AC “closed loop” motor pace controller to take care of zero.1 percent pump velocity accuracy.
The Zenith 9000 collection pump is out there in 11 sizes with capacities starting from .003 to 300 GPH. Wetted elements are available in through hardened 440C collection stainless-steel, specialty handled 316 stainless steel, and top quality software steels similar to D2, M2, M4 and CPM-M4 to provide good corrosion and abrasion resistance.
The bag manufacturer chosen a model with a magnetic drive (mag-drive) sealing choice, which may remove shaft leakage of fluids, rising plant safety and reducing risky organic compound emissions. The use of a magnetic coupling additionally eliminates downtime as a outcome of mechanical seal failures and eliminates the necessity for buffer fluids.
New resolution reduces costs and offers uniform fragrance distribution
The new Zenith pump system gave the scented bag manufacturer a steady, pulse free process, which ensures equal and uniform fragrance distribution. By adding the scent directly to the baggage after leaving the extruder, the plastic bag producer not only eliminated the need to have separate pellet silos for each scent, but additionally 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 profitable trials, ordered six extra techniques. Over the past two years they have purchased more than 30 techniques, with plans to order more. The manufacturer can also be thinking about having Zenith conduct annual area calibrations of every system.
After two years of operation, the manufacturer estimates a yearly savings of roughly $480,000 per skid in operation. With 30 skids now running, the return on funding for each system buy can be measured in weeks. To date, there have been no odor complaints because the customer put in the Zenith systems