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

ไดอะแฟรม ซีล 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 baggage was in search of an various to the usage 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 on the low flow rates required, while also decreasing their prices and enhancing worker health. Yearly savings are so high that the return on funding for the pump system may be measured in days.
Seeking another for expensive pre-scented plastic pellets

A international producer of scented plastic garbage luggage was looking for a substitute for using pre-scented plastic pellets, which required a devoted silo for every of the 20 out there fragrances. The pellets are pneumatically conveyed to each silo from either tanker vehicles or rail vehicles and the producer was experiencing logistical points related to keeping the silos stuffed. They additionally had to carry high prices for maintaining the inventory of the pre-scented pellets.
In addition, the heavily concentrated scents had been inflicting well being issues 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 occasion, these emissions led to complaints from neighbors and citations from the United States Environmental Protection Agency.
The company was in search of a method to use plain plastic pellets and apply scented oil on to the plastic sheet instantly after the extrusion process to reduce prices, logistical challenges, and vitality use. They had tried to build such a system in-house but had struggled to achieve accuracy and consistency on the low flow rates they required. They decided to hunt a pump-based resolution that could immediately spray perfume on the warm melted sheet plastic as a end result of the in-house answer could not meet rigorous high quality control requirements requiring the spray-on scent to exactly match that of pre-scented pellets.
Finding an answer on a tradeshow flooring

Design engineers from the plastic bag manufacturer attending the PackExpo present noticed a working demonstration of precision gear metering pumps made by Zenith and requested application experts if the pumps might be a fit with their utility. After amassing info on the applying, an area manager for the pump producer with extensive experience in dosing and blending techniques visited the plant to get a firsthand view of current operations and gather extra information.
Working with the pump manufacturer’s design group they developed a system resolution utilizing a Zenith B-9000 Series rotary positive displacement pump particularly designed for single stream chemical duty purposes. The pump options an correct, repeatable, pulse free move in a compact design ideal for dosing additives corresponding to colors, flavors, and fragrances.
This kind of pump is outlined as rotary as a result of the drive shaft is rotated as in comparability with different types of pumps utilizing a reciprocating movement and is also thought of to be a constructive displacement sort as a outcome of the displaced quantity is fixed and doesn’t range.
Pumping action is achieved by filling the gear enamel spaces and transporting the fluid around the outer diameter of the gears. When the gear tooth mesh, the fluid is displaced and forced to the outlet facet of the pump. The circulate fee can only be adjusted by increasing or lowering the speed at which the shaft is rotated. The pump chosen presents precision grinding and lapping processes that result in a precision metering instrument, producing precise, pulse-less, and repeatable fluid flow.
The pumps offer extremely tight working clearances to minimize fluid slip. Manufacturing tolerances on many elements are to +/- 50 millionths of inch with floor finishes as clean as four micro inches or better. The pumps are provided with an AC “closed loop” motor speed controller to take care of 0.1 % pump speed accuracy.
The Zenith 9000 sequence pump is available in 11 sizes with capacities ranging from .003 to 300 GPH. Wetted components can be found in via hardened 440C series chrome steel, specialty handled 316 stainless-steel, and prime quality device steels corresponding to D2, M2, M4 and CPM-M4 to offer good corrosion and abrasion resistance.
The bag producer selected a model with a magnetic drive (mag-drive) sealing possibility, which can get rid of shaft leakage of fluids, rising plant safety and lowering risky organic compound emissions. The use of a magnetic coupling additionally eliminates downtime due to mechanical seal failures and eliminates the necessity for buffer fluids.
New solution reduces costs and presents uniform perfume distribution

The new Zenith pump system gave the scented bag manufacturer a continuous, pulse free process, which guarantees equal and uniform fragrance distribution. By including the scent on to the luggage after leaving the extruder, the plastic bag manufacturer not only eradicated the need to have separate pellet silos for every scent, but in addition eradicated the need to vent the fumes that come from the pellets as they journey from the silos to the extruders.
The manufacturer bought the primary system and after successful trials, ordered six additional systems. Over the previous two years they’ve purchased more than 30 methods, with plans to order extra. The producer is also interested in having Zenith conduct annual area calibrations of every system.
After two years of operation, the manufacturer estimates a yearly savings of approximately $480,000 per skid in operation. With 30 skids now operating, the return on investment for each system buy can be measured in weeks. To date, there have been no odor complaints because the customer put in the Zenith techniques


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