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

Pump purchase return on funding can be measured in days
By Mike Libbey, Area Sales Manager CIRCOR and Bob Limper, Business Development Manager CIRCOR
A world manufacturer of scented plastic rubbish bags was looking for an alternative alternative to using pre-scented plastic pellets. A serendipitous encounter at a tradeshow led them to a precision gear metering pump answer that gave them accuracy and consistency on the low circulate rates required, whereas also lowering their prices and enhancing employee well being. Yearly savings are so high that the return on investment for the pump system can be measured in days.
Seeking another for pricey pre-scented plastic pellets
A global producer of scented plastic garbage luggage was looking for an alternative to using pre-scented plastic pellets, which required a devoted silo for every of the 20 available fragrances. The pellets are pneumatically conveyed to every silo from either tanker vehicles or rail cars and the producer was experiencing logistical points related to maintaining the silos stuffed. They also had to carry excessive prices for sustaining the inventory of the pre-scented pellets.
In addition, the closely concentrated scents had been inflicting well being considerations for the employees who complained of complications. To mitigate this issue, 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 firm was seeking a method to use plain plastic pellets and apply scented oil on to the plastic sheet immediately after the extrusion process to reduce costs, logistical challenges, and vitality use. They had tried to construct such a system in-house but had struggled to achieve accuracy and consistency at the low flow charges they required. They decided to seek a pump-based answer that might directly spray perfume on the warm melted sheet plastic as a outcome of the in-house resolution couldn’t meet rigorous high quality management requirements requiring the spray-on scent to exactly match that of pre-scented pellets.
Finding an answer on a tradeshow floor
Design engineers from the plastic bag producer attending the PackExpo present noticed a working demonstration of precision gear metering pumps made by Zenith and asked software consultants if the pumps could be a fit with their application. After accumulating data on the applying, an area manager for the pump producer with intensive experience in dosing and blending techniques visited the plant to get a firsthand view of present operations and collect extra data.
Working with the pump manufacturer’s design group they developed a system answer using a Zenith B-9000 Series rotary positive displacement pump specifically designed for single stream chemical duty functions. The pump features an correct, repeatable, pulse free circulate in a compact design ideal for dosing components corresponding to colours, flavors, and fragrances.
This sort of pump is defined as rotary as a outcome of the drive shaft is rotated as in comparison with other forms of pumps using a reciprocating movement and can also be thought of to be a positive displacement kind as a end result of the displaced volume is constant and does not differ.
Pumping motion is achieved by filling the gear tooth 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 flow rate can only be adjusted by increasing or lowering the pace 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 circulate.
The pumps provide extremely tight operating clearances to attenuate fluid slip. Manufacturing tolerances on many parts are to +/- 50 millionths of inch with floor finishes as clean as 4 micro inches or better. The pumps are offered with an AC “closed loop” motor pace controller to maintain zero.1 p.c pump velocity accuracy.
The Zenith 9000 series pump is available in 11 sizes with capacities starting from .003 to 300 GPH. Wetted elements can be found in through hardened 440C series chrome steel, specialty handled 316 chrome steel, and top quality software steels similar to D2, M2, M4 and CPM-M4 to supply good corrosion and abrasion resistance.
The bag manufacturer chosen a mannequin with a magnetic drive (mag-drive) sealing possibility, which might eliminate shaft leakage of fluids, rising plant safety and decreasing unstable organic compound emissions. The use of a magnetic coupling additionally eliminates downtime due to mechanical seal failures and eliminates the necessity for buffer fluids.
New solution reduces prices and offers uniform fragrance distribution
The new Zenith pump system gave the scented bag manufacturer a steady, pulse free process, which guarantees equal and uniform perfume distribution. By adding the scent directly to the bags after leaving the extruder, the plastic bag manufacturer not solely eradicated the necessity to have separate pellet silos for every scent, but also eliminated the necessity to vent the fumes that come from the pellets as they journey from the silos to the extruders.
The manufacturer purchased the first system and after profitable trials, ordered six additional systems. Over the past two years they’ve bought more than 30 methods, with plans to order extra. The producer can additionally be thinking about having Zenith conduct annual subject 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 operating, the return on funding for each system purchase can be measured in weeks. To ราคาเพรสเชอร์เกจ , there have been no odor complaints because the buyer put in the Zenith systems

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