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

Pump purchase return on investment 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 garbage baggage was looking 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 solution that gave them accuracy and consistency at the low flow rates required, whereas also lowering their prices and improving worker well being. Yearly financial savings are so excessive that the return on investment for the pump system may be measured in days.
Seeking another for expensive pre-scented plastic pellets
A global manufacturer of scented plastic rubbish bags was in search of an different alternative to the usage 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 vehicles or rail vehicles and the producer was experiencing logistical issues related to keeping the silos crammed. They also had to carry high costs for maintaining the stock of the pre-scented pellets.
In addition, the closely concentrated scents had been inflicting health considerations for the employees who complained of headaches. To mitigate this problem, every extruder line was fitted with a vacuum exhaust hood to expel the fumes to the outside. 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 use plain plastic pellets and apply scented oil on to the plastic sheet instantly after the extrusion process to scale back prices, logistical challenges, and power use. They had tried to construct such a system in-house however had struggled to realize accuracy and consistency at the low flow charges they required. They determined to seek a pump-based solution that might immediately spray perfume on the warm melted sheet plastic as a outcome of the in-house solution 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 producer attending the PackExpo present noticed a working demonstration of precision gear metering pumps made by Zenith and asked application experts if the pumps might be a match with their utility. After amassing info on the applying, an space manager for the pump manufacturer with in depth expertise in dosing and blending systems visited the plant to get a firsthand view of current operations and gather extra info.
Working with the pump manufacturer’s design group they developed a system answer using a Zenith B-9000 Series rotary optimistic displacement pump specifically designed for single stream chemical responsibility applications. The pump options an correct, repeatable, pulse free move in a compact design ideal for dosing additives similar to colours, flavors, and fragrances.
This sort of pump is outlined as rotary as a result of the drive shaft is rotated as in comparability with other types of pumps utilizing a reciprocating motion and is also considered to be a positive displacement sort because the displaced volume is constant and does not vary.
Pumping action is achieved by filling the gear enamel areas and transporting the fluid across the outer diameter of the gears. When the gear enamel mesh, the fluid is displaced and forced to the outlet facet of the pump. The circulate fee can solely be adjusted by rising or decreasing the velocity at which the shaft is rotated. The pump chosen offers precision grinding and lapping processes that end in a precision metering instrument, producing exact, pulse-less, and repeatable fluid move.
The pumps supply extraordinarily tight working clearances to attenuate fluid slip. Manufacturing tolerances on many parts are to +/- 50 millionths of inch with surface finishes as easy as four micro inches or better. The pumps are provided with an AC “closed loop” motor speed controller to maintain up 0.1 % pump pace accuracy.
The Zenith 9000 collection pump is out there in 11 sizes with capacities ranging from .003 to 300 GPH. Wetted parts are available in by way of hardened 440C sequence stainless steel, specialty treated 316 stainless steel, and top quality software steels corresponding to D2, M2, M4 and CPM-M4 to offer good corrosion and abrasion resistance.
The bag producer chosen a model with a magnetic drive (mag-drive) sealing possibility, which might remove shaft leakage of fluids, growing plant safety and lowering risky organic compound emissions. The use of a magnetic coupling additionally eliminates downtime as a result of mechanical seal failures and eliminates the need for buffer fluids.
New answer reduces costs and provides uniform fragrance distribution
The new Zenith pump system gave the scented bag manufacturer a steady, pulse free process, which ensures equal and uniform fragrance 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 in addition eradicated the want to vent the fumes that come from the pellets as they travel from the silos to the extruders.
pressure gauge ออก หลัง bought the primary system and after successful trials, ordered six extra systems. Over the previous two years they’ve bought more than 30 methods, with plans to order extra. The producer is also thinking about having Zenith conduct annual area 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 working, the return on investment for each system purchase may be measured in weeks. To date, there have been no odor complaints for the reason that customer installed the Zenith methods

Recent Posts