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

Pump buy return on investment may be measured in days
By Mike Libbey, Area Sales Manager CIRCOR and Bob Limper, Business Development Manager CIRCOR
A world producer of scented plastic rubbish luggage was on the lookout for a substitute for 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 circulate rates required, whereas also reducing their prices and improving worker health. Yearly savings are so excessive that the return on funding for the pump system could be measured in days.
Seeking เกจ์ลมsumo for expensive pre-scented plastic pellets
A international manufacturer of scented plastic garbage luggage was looking for an different alternative to using pre-scented plastic pellets, which required a devoted silo for each of the 20 available fragrances. The pellets are pneumatically conveyed to every silo from both tanker vans or rail vehicles and the producer was experiencing logistical issues associated with maintaining the silos filled. They additionally had to carry excessive costs for maintaining the inventory of the pre-scented pellets.
In addition, the closely concentrated scents had been inflicting well being issues for the workers who complained of complications. To mitigate this problem, each extruder line was fitted with a vacuum exhaust hood to expel the fumes to the outdoors. On occasion, these emissions led to complaints from neighbors and citations from the United States Environmental Protection Agency.
The company was in search of a way to use plain plastic pellets and apply scented oil directly to the plastic sheet instantly after the extrusion course of to scale back prices, logistical challenges, and power use. They had tried to construct such a system in-house however had struggled to attain accuracy and consistency on the low circulate charges they required. They decided to seek a pump-based answer that would immediately spray perfume on the warm melted sheet plastic as a result of the in-house resolution could not meet rigorous quality control requirements requiring the spray-on scent to precisely match that of pre-scented pellets.
Finding an answer on a tradeshow floor
Design engineers from the plastic bag producer attending the PackExpo show noticed a working demonstration of precision gear metering pumps made by Zenith and asked application experts if the pumps could be a match with their utility. After accumulating information on the applying, an space manager for the pump manufacturer with extensive experience in dosing and mixing 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 resolution using a Zenith B-9000 Series rotary constructive displacement pump particularly designed for single stream chemical obligation applications. The pump features an accurate, repeatable, pulse free move in a compact design best for dosing components corresponding to colors, flavors, and fragrances.
This type of pump is outlined as rotary because the drive shaft is rotated as compared to different kinds of pumps using a reciprocating movement and is also thought-about to be a optimistic displacement kind as a outcome of the displaced volume is fixed and doesn’t vary.
Pumping action is achieved by filling the gear tooth spaces and transporting the fluid across the outer diameter of the gears. When the gear tooth mesh, the fluid is displaced and compelled to the outlet facet of the pump. The move price can solely be adjusted by increasing or lowering the speed at which the shaft is rotated. The pump chosen provides precision grinding and lapping processes that lead to a precision metering instrument, producing exact, pulse-less, and repeatable fluid circulate.
The pumps supply extraordinarily tight working clearances to reduce fluid slip. Manufacturing tolerances on many components are to +/- 50 millionths of inch with floor finishes as clean as four micro inches or higher. The pumps are supplied with an AC “closed loop” motor velocity controller to hold up 0.1 % pump velocity accuracy.
The Zenith 9000 sequence pump is out there in 11 sizes with capacities starting from .003 to 300 GPH. Wetted parts can be found in through hardened 440C sequence chrome steel, specialty treated 316 stainless steel, and high quality device steels similar to D2, M2, M4 and CPM-M4 to supply good corrosion and abrasion resistance.
The bag producer selected a mannequin with a magnetic drive (mag-drive) sealing choice, which may get rid of shaft leakage of fluids, rising plant safety and reducing risky natural compound emissions. The use of a magnetic coupling also eliminates downtime as a result of mechanical seal failures and eliminates the need for buffer fluids.
New solution reduces costs and offers uniform fragrance distribution
The new Zenith pump system gave the scented bag producer a steady, pulse free process, which guarantees equal and uniform perfume distribution. By adding the scent directly to the baggage after leaving the extruder, the plastic bag producer not only eliminated the necessity to have separate pellet silos for each scent, but additionally eliminated the want to vent the fumes that come from the pellets as they journey from the silos to the extruders.
The producer purchased the first system and after successful trials, ordered six further techniques. Over the previous two years they have purchased more than 30 methods, with plans to order extra. The manufacturer can be thinking about having Zenith conduct annual field calibrations of each system.
After two years of operation, the producer estimates a yearly financial savings of approximately $480,000 per skid in operation. With 30 skids now running, the return on investment for every system purchase may be measured in weeks. To date, there have been no odor complaints for the explanation that buyer put in the Zenith techniques

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