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

Pump purchase return on investment could 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 in search of an various to using pre-scented plastic pellets. A serendipitous encounter at a tradeshow led them to a precision gear metering pump resolution that gave them accuracy and consistency at the low circulate charges required, whereas also reducing their prices and bettering worker health. Yearly financial savings are so excessive that the return on funding for the pump system could be measured in days.
Seeking another for costly 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 out there fragrances. The pellets are pneumatically conveyed to each silo from both tanker trucks or rail vehicles and the producer was experiencing logistical points associated with preserving the silos crammed. They additionally needed to carry high costs for sustaining the stock of the pre-scented pellets.
In addition, the closely concentrated scents had been causing health considerations for the employees who complained of complications. To mitigate this problem, 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 use plain plastic pellets and apply scented oil directly to the plastic sheet instantly after the extrusion process to reduce costs, logistical challenges, and vitality use. They had tried to build such a system in-house however had struggled to attain accuracy and consistency on the low circulate charges they required. They decided to hunt a pump-based resolution that could directly spray perfume on the nice and cozy melted sheet plastic as a outcome of the in-house solution could not meet rigorous high quality control standards requiring the spray-on scent to precisely match that of pre-scented pellets.
Finding an answer on a tradeshow flooring
Design engineers from the plastic bag manufacturer attending the PackExpo present observed a working demonstration of precision gear metering pumps made by Zenith and requested utility consultants if the pumps may be a fit with their utility. After amassing data on the applying, an space supervisor for the pump producer with extensive expertise in dosing and blending methods visited the plant to get a firsthand view of present operations and collect extra info.
Working with the pump manufacturer’s design group they developed a system solution utilizing a Zenith B-9000 Series rotary optimistic displacement pump specifically designed for single stream chemical duty purposes. The pump features an accurate, repeatable, pulse free circulate in a compact design ideal for dosing additives such as colors, flavors, and fragrances.
This sort of pump is outlined as rotary as a outcome of the drive shaft is rotated as in comparison with other kinds of pumps using a reciprocating motion and can be thought of to be a optimistic displacement kind because the displaced quantity is fixed and does not differ.
Pumping motion is achieved by filling the gear enamel spaces and transporting the fluid around the outer diameter of the gears. When the gear teeth mesh, the fluid is displaced and forced to the outlet side of the pump. The circulate rate can solely be adjusted by growing or decreasing the pace at which the shaft is rotated. เกจวัดแรงดันลม10bar selected provides precision grinding and lapping processes that end in a precision metering instrument, producing exact, pulse-less, and repeatable fluid circulate.
The pumps provide extremely tight operating clearances to reduce fluid slip. Manufacturing tolerances on many parts are to +/- 50 millionths of inch with surface finishes as clean as four micro inches or better. The pumps are offered with an AC “closed loop” motor velocity controller to take care of zero.1 % pump velocity accuracy.
The Zenith 9000 collection pump is available in 11 sizes with capacities starting from .003 to 300 GPH. Wetted components can be found in through hardened 440C collection stainless-steel, specialty handled 316 stainless steel, and top quality device steels such as 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 might get rid of shaft leakage of fluids, growing plant security and reducing unstable natural compound emissions. The use of a magnetic coupling also eliminates downtime due to mechanical seal failures and eliminates the necessity for buffer fluids.
New resolution reduces prices and offers uniform perfume distribution
The new Zenith pump system gave the scented bag producer a steady, pulse free process, which ensures equal and uniform perfume distribution. By adding the scent on to the luggage after leaving the extruder, the plastic bag producer not only eliminated the necessity to have separate pellet silos for every scent, but in addition eradicated the necessity 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 extra systems. Over the previous two years they have purchased greater than 30 methods, with plans to order extra. The producer can be thinking about having Zenith conduct annual subject calibrations of every 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 may be measured in weeks. To date, there have been no odor complaints since the customer installed the Zenith methods

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