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 global producer of scented plastic rubbish bags was in search of an different 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 at the low circulate rates required, whereas additionally reducing their costs and enhancing worker well being. Yearly savings are so high that the return on funding for the pump system could be measured in days.
Seeking another for expensive pre-scented plastic pellets
A global producer of scented plastic rubbish luggage was looking for a substitute for the use of pre-scented plastic pellets, which required a dedicated silo for every of the 20 available fragrances. The pellets are pneumatically conveyed to every silo from either tanker vans or rail automobiles and the manufacturer was experiencing logistical points related to maintaining the silos filled. They additionally had to carry excessive prices for sustaining the stock of the pre-scented pellets.
In addition, the closely concentrated scents had been inflicting health concerns for the workers who complained of headaches. To mitigate this concern, each 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 looking for a means to make use of plain plastic pellets and apply scented oil directly to the plastic sheet immediately after the extrusion process to reduce prices, logistical challenges, and energy use. They had tried to construct such a system in-house but had struggled to realize accuracy and consistency on the low move rates they required. They decided to hunt a pump-based solution that would immediately spray fragrance on the nice and cozy melted sheet plastic because the in-house solution couldn’t meet rigorous quality management 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 manufacturer attending the PackExpo show noticed a working demonstration of precision gear metering pumps made by Zenith and requested application experts if the pumps may be a match with their software. After collecting info on the appliance, an space manager for the pump producer with in depth expertise in dosing and blending techniques visited the plant to get a firsthand view of present operations and gather 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 move in a compact design best for dosing additives similar to colors, flavors, and fragrances.
This type of pump is defined as rotary because the drive shaft is rotated as compared to different forms of pumps using a reciprocating movement and can be considered to be a constructive displacement kind as a outcome of the displaced quantity is fixed and doesn’t range.
Pumping action is achieved by filling the gear teeth areas and transporting the fluid around the outer diameter of the gears. When the gear enamel mesh, the fluid is displaced and forced to the outlet side of the pump. The circulate fee can solely be adjusted by rising or decreasing the pace at which the shaft is rotated. The pump selected provides precision grinding and lapping processes that end in a precision metering instrument, producing exact, pulse-less, and repeatable fluid circulate.
The pumps offer extraordinarily tight working clearances to attenuate fluid slip. Manufacturing tolerances on many elements are to +/- 50 millionths of inch with floor finishes as easy as four micro inches or better. The pumps are offered with an AC “closed loop” motor pace controller to maintain zero.1 percent pump pace accuracy.
The Zenith 9000 sequence pump is on the market in eleven sizes with capacities starting from .003 to 300 GPH. Wetted components are available in through hardened 440C collection chrome steel, specialty treated 316 stainless steel, and high quality device steels such as D2, M2, M4 and CPM-M4 to offer good corrosion and abrasion resistance.
The bag manufacturer chosen a model with a magnetic drive (mag-drive) sealing possibility, which might get rid of shaft leakage of fluids, rising plant safety and lowering risky organic compound emissions. เกจวัดแรงดันน้ำราคา of a magnetic coupling also eliminates downtime due to mechanical seal failures and eliminates the need for buffer fluids.
New answer reduces costs and presents uniform perfume 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 on to the luggage after leaving the extruder, the plastic bag producer not only eradicated 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 travel from the silos to the extruders.
The manufacturer purchased the primary system and after successful trials, ordered six additional methods. Over the past two years they’ve bought greater than 30 techniques, with plans to order more. The manufacturer can be excited about having Zenith conduct annual field calibrations of each 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 working, the return on funding for every system buy can be measured in weeks. To date, there have been no odor complaints for the rationale that customer installed the Zenith systems

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