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

Pump purchase return on funding may 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 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 on the low move rates required, while additionally lowering their prices and bettering worker health. Yearly savings are so excessive that the return on investment for the pump system can be measured in days.
Seeking an alternate for pricey pre-scented plastic pellets
A global producer of scented plastic rubbish bags was on the lookout for an different to using pre-scented plastic pellets, which required a dedicated silo for every of the 20 out there fragrances. The pellets are pneumatically conveyed to each silo from either tanker vehicles or rail vehicles and the producer was experiencing logistical issues associated with keeping the silos filled. They additionally needed to carry high costs for maintaining the stock of the pre-scented pellets.
In addition, the closely concentrated scents had been causing well being concerns for the workers who complained of complications. To mitigate this concern, every extruder line was fitted with a vacuum exhaust hood to expel the fumes to the outdoors. On event, these emissions led to complaints from neighbors and citations from the United States Environmental Protection Agency.
The company was in search of a means to make use of plain plastic pellets and apply scented oil directly to the plastic sheet instantly after the extrusion course of to reduce costs, logistical challenges, and power use. They had tried to build such a system in-house however had struggled to achieve accuracy and consistency at the low flow rates they required. They decided to seek a pump-based resolution that could instantly spray perfume on the nice and cozy melted sheet plastic as a outcome of the in-house solution could not meet rigorous high quality management requirements requiring the spray-on scent to precisely match that of pre-scented pellets.
Finding an answer on a tradeshow ground
Design engineers from the plastic bag manufacturer attending the PackExpo present noticed a working demonstration of precision gear metering pumps made by Zenith and asked utility experts if the pumps might be a match with their application. After accumulating info on the applying, an area manager for the pump manufacturer with in depth expertise in dosing and mixing techniques visited the plant to get a firsthand view of present operations and collect extra information.
Working with the pump manufacturer’s design group they developed a system resolution using a Zenith B-9000 Series rotary positive displacement pump particularly designed for single stream chemical duty purposes. The pump features an correct, repeatable, pulse free move in a compact design perfect for dosing additives similar to colours, flavors, and fragrances.
This kind of pump is outlined as rotary as a outcome of the drive shaft is rotated as in comparability with other forms of pumps utilizing a reciprocating motion and can additionally be thought-about to be a optimistic displacement sort as a end result of the displaced volume is fixed and doesn’t 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 facet of the pump. The move price can solely be adjusted by growing or reducing the pace at which the shaft is rotated. pressure gauge วัด แรง ดัน น้ำ selected offers precision grinding and lapping processes that lead to 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 floor finishes as easy as four micro inches or higher. The pumps are offered with an AC “closed loop” motor velocity controller to maintain 0.1 p.c pump velocity accuracy.
The Zenith 9000 sequence pump is out there in eleven sizes with capacities starting from .003 to 300 GPH. Wetted components can be found in via hardened 440C collection stainless-steel, specialty treated 316 stainless steel, and high quality software steels such as D2, M2, M4 and CPM-M4 to offer good corrosion and abrasion resistance.
The bag producer selected a model with a magnetic drive (mag-drive) sealing option, which might remove shaft leakage of fluids, growing plant security and decreasing unstable natural compound emissions. The use of a magnetic coupling additionally eliminates downtime as a result of mechanical seal failures and eliminates the necessity for buffer fluids.
New resolution reduces prices and presents uniform perfume distribution
The new Zenith pump system gave the scented bag manufacturer a continuous, pulse free process, which ensures equal and uniform perfume distribution. By adding the scent directly to the baggage after leaving the extruder, the plastic bag producer not solely eliminated the need to have separate pellet silos for every scent, but also eradicated the need to vent the fumes that come from the pellets as they journey from the silos to the extruders.
The manufacturer purchased the primary system and after successful trials, ordered six additional techniques. Over the past two years they’ve purchased more than 30 techniques, with plans to order extra. The manufacturer can be interested in having Zenith conduct annual area calibrations of each system.
After two years of operation, the manufacturer estimates a yearly savings of approximately $480,000 per skid in operation. With 30 skids now working, the return on investment for every system purchase may be measured in weeks. To date, there have been no odor complaints for the reason that buyer put in the Zenith methods

Scroll to Top