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 international producer of scented plastic rubbish luggage was on the lookout 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 answer that gave them accuracy and consistency at the low move rates required, while also decreasing their costs and improving employee well being. Yearly savings are so high that the return on investment for the pump system may be measured in days.
Seeking an alternate for expensive pre-scented plastic pellets
A international manufacturer of scented plastic rubbish bags was on the lookout for an various alternative to the use of pre-scented plastic pellets, which required a devoted silo for each of the 20 out there fragrances. The pellets are pneumatically conveyed to each silo from both tanker trucks or rail cars and the manufacturer was experiencing logistical issues related to preserving the silos crammed. They additionally needed to carry excessive costs for maintaining the stock of the pre-scented pellets.
In addition, the closely concentrated scents had been inflicting well being concerns for the employees who complained of headaches. To mitigate this concern, 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 means to make use of plain plastic pellets and apply scented oil on to the plastic sheet immediately after the extrusion process to reduce costs, logistical challenges, and power use. เกจวัดแรงดันเบนซิน had tried to build such a system in-house however had struggled to realize accuracy and consistency on the low move rates they required. They determined to hunt a pump-based answer that might immediately spray fragrance on the good and cozy melted sheet plastic because the in-house resolution could not meet rigorous high quality control requirements requiring the spray-on scent to precisely match that of pre-scented pellets.
Finding a solution 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 may be a match with their software. After amassing data on the applying, an space manager for the pump manufacturer with in depth experience in dosing and blending methods visited the plant to get a firsthand view of present operations and collect additional information.
Working with the pump manufacturer’s design group they developed a system answer using a Zenith B-9000 Series rotary positive displacement pump particularly designed for single stream chemical obligation functions. The pump options an accurate, repeatable, pulse free move in a compact design perfect for dosing components similar to colours, flavors, and fragrances.
This kind of pump is defined as rotary as a end result of the drive shaft is rotated as compared to different types of pumps utilizing a reciprocating motion and is also considered to be a constructive displacement sort because the displaced quantity is constant and does not vary.
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 circulate rate can only be adjusted by increasing or lowering the pace at which the shaft is rotated. The pump selected offers precision grinding and lapping processes that end in a precision metering instrument, producing precise, pulse-less, and repeatable fluid circulate.
The pumps provide extremely tight operating clearances to minimize fluid slip. Manufacturing tolerances on many parts are to +/- 50 millionths of inch with surface finishes as smooth as four micro inches or better. The pumps are offered with an AC “closed loop” motor velocity controller to maintain zero.1 % pump velocity accuracy.
The Zenith 9000 sequence pump is available in eleven sizes with capacities starting from .003 to 300 GPH. Wetted components can be found in by way of hardened 440C series stainless-steel, specialty handled 316 stainless steel, and high quality tool steels similar to D2, M2, M4 and CPM-M4 to supply good corrosion and abrasion resistance.
The bag producer chosen a model with a magnetic drive (mag-drive) sealing choice, which can remove shaft leakage of fluids, growing 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 need for buffer fluids.
New resolution reduces costs and offers uniform fragrance distribution
The new Zenith pump system gave the scented bag manufacturer a continuous, pulse free course of, which ensures equal and uniform perfume distribution. By including the scent directly to the luggage after leaving the extruder, the plastic bag manufacturer not solely eradicated the need to have separate pellet silos for every scent, but also eliminated the want to vent the fumes that come from the pellets as they travel from the silos to the extruders.
The manufacturer bought the primary system and after profitable trials, ordered six further techniques. Over the past two years they’ve purchased greater than 30 techniques, with plans to order extra. The producer can also be thinking about having Zenith conduct annual field calibrations of each system.
After two years of operation, the manufacturer estimates a yearly financial savings of roughly $480,000 per skid in operation. With 30 skids now running, the return on funding for each system purchase could be measured in weeks. To date, there have been no odor complaints since the customer installed the Zenith systems

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