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 luggage was on the lookout for an alternative choice to the use of 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 on the low move charges required, whereas also decreasing their prices and enhancing employee well being. Yearly financial savings are so excessive that the return on funding for the pump system could be measured in days.
Seeking an alternative for pricey pre-scented plastic pellets

A world producer of scented plastic garbage bags was looking for an alternative to the usage of pre-scented plastic pellets, which required a devoted silo for every of the 20 obtainable fragrances. The pellets are pneumatically conveyed to each silo from both tanker vehicles or rail vehicles and the producer was experiencing logistical points associated with keeping the silos crammed. They also had to carry high costs for maintaining the inventory of the pre-scented pellets.
In addition, the closely concentrated scents had been causing health considerations for the employees who complained of headaches. To mitigate this concern, 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 firm was in search of a way to make use of plain plastic pellets and apply scented oil on to the plastic sheet immediately after the extrusion process to minimize back costs, logistical challenges, and power use. They had tried to construct such a system in-house but had struggled to attain accuracy and consistency on the low move rates they required. They decided to seek a pump-based answer that could instantly spray perfume on the warm melted sheet plastic as a end result of the in-house solution couldn’t meet rigorous quality control requirements requiring the spray-on scent to precisely match that of pre-scented pellets.
Finding a solution on a tradeshow floor

Design engineers from the plastic bag manufacturer attending the PackExpo present observed a working demonstration of precision gear metering pumps made by Zenith and asked utility specialists if the pumps might be a fit with their application. After amassing information on the appliance, an space manager for the pump producer with extensive experience in dosing and blending systems visited the plant to get a firsthand view of present operations and gather extra data.
Working with the pump manufacturer’s design group they developed a system answer utilizing a Zenith B-9000 Series rotary positive displacement pump specifically designed for single stream chemical duty purposes. The pump options an correct, repeatable, pulse free move in a compact design ideal for dosing additives such as colours, flavors, and fragrances.
This kind of pump is defined as rotary because the drive shaft is rotated as compared to different kinds of pumps utilizing a reciprocating motion and can be thought-about to be a optimistic displacement sort as a end result of the displaced volume is fixed and does not 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 teeth mesh, the fluid is displaced and compelled to the outlet facet of the pump. The move price can solely be adjusted by increasing or decreasing the speed at which the shaft is rotated. The pump chosen offers precision grinding and lapping processes that result in a precision metering instrument, producing precise, 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 surface finishes as easy as four micro inches or higher. The pumps are supplied with an AC “closed loop” motor velocity controller to maintain zero.1 % pump velocity accuracy.
The Zenith 9000 collection pump is on the market in eleven sizes with capacities starting from .003 to 300 GPH. เกจวัดแรงดันน้ำมันเครื่อง can be found in by way of hardened 440C sequence chrome steel, specialty handled 316 chrome steel, and top quality device steels corresponding to 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 option, which may remove shaft leakage of fluids, growing plant security and reducing unstable natural 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 offers uniform perfume distribution

The new Zenith pump system gave the scented bag producer a steady, pulse free process, which guarantees equal and uniform fragrance distribution. By including the scent directly to the baggage after leaving the extruder, the plastic bag manufacturer not only eradicated the necessity to have separate pellet silos for every scent, but also eliminated the necessity to vent the fumes that come from the pellets as they travel from the silos to the extruders.
The producer purchased the primary system and after successful trials, ordered six further systems. Over the previous two years they have purchased greater than 30 techniques, with plans to order more. The producer can be excited about having Zenith conduct annual subject calibrations of every 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 investment for each system purchase could be measured in weeks. To date, there have been no odor complaints for the rationale that customer put in the Zenith methods


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