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

Pump buy return on investment can be measured in days
By Mike Libbey, Area Sales Manager CIRCOR and Bob Limper, Business Development Manager CIRCOR
A world manufacturer of scented plastic garbage baggage was looking for an alternative 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 move rates required, while additionally reducing their costs and enhancing worker health. Yearly savings are so high that the return on funding for the pump system may be measured in days.
Seeking an alternative for costly pre-scented plastic pellets
A international manufacturer of scented plastic garbage luggage was in search of an various alternative to using pre-scented plastic pellets, which required a devoted silo for every of the 20 out there fragrances. The pellets are pneumatically conveyed to every silo from either tanker trucks or rail vehicles and the manufacturer was experiencing logistical issues related to preserving the silos crammed. They additionally needed to carry high costs for maintaining the inventory of the pre-scented pellets.
In addition, the heavily concentrated scents had been inflicting health issues for the employees who complained of complications. To mitigate this concern, 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 firm was in search of a method to make use of plain plastic pellets and apply scented oil directly to the plastic sheet instantly after the extrusion course of to minimize back 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 flow charges they required. They determined to seek a pump-based answer that would immediately spray fragrance on the warm melted sheet plastic as a outcome of the in-house resolution couldn’t meet rigorous quality control standards requiring the spray-on scent to precisely match that of pre-scented pellets.
Finding เครื่องมือความดัน on a tradeshow floor
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 software experts if the pumps could be a match with their application. After amassing data on the application, an area supervisor for the pump manufacturer with extensive experience in dosing and mixing systems visited the plant to get a firsthand view of current operations and collect additional information.
Working with the pump manufacturer’s design group they developed a system answer utilizing a Zenith B-9000 Series rotary optimistic displacement pump particularly designed for single stream chemical obligation purposes. The pump options an accurate, repeatable, pulse free circulate in a compact design perfect for dosing components such as colors, flavors, and fragrances.
This sort of pump is defined as rotary as a outcome of the drive shaft is rotated as compared to different kinds of pumps utilizing a reciprocating movement and can be considered to be a optimistic displacement type as a outcome of the displaced volume is constant and does not vary.
Pumping motion is achieved by filling the gear tooth 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 move rate can solely be adjusted by rising or lowering the pace at which the shaft is rotated. The pump selected offers precision grinding and lapping processes that lead to a precision metering instrument, producing precise, pulse-less, and repeatable fluid move.
The pumps provide extraordinarily 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 higher. The pumps are offered with an AC “closed loop” motor speed controller to take care of 0.1 p.c pump velocity accuracy.
The Zenith 9000 sequence pump is out there in 11 sizes with capacities starting from .003 to 300 GPH. Wetted parts can be found in via hardened 440C sequence chrome steel, specialty treated 316 chrome steel, and top quality software steels similar to D2, M2, M4 and CPM-M4 to provide good corrosion and abrasion resistance.
The bag manufacturer chosen a model with a magnetic drive (mag-drive) sealing possibility, which may remove shaft leakage of fluids, increasing plant security and decreasing volatile organic compound emissions. The use of a magnetic coupling also eliminates downtime as a outcome of mechanical seal failures and eliminates the need for buffer fluids.
New solution reduces prices and provides 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 directly to the baggage after leaving the extruder, the plastic bag manufacturer not solely eradicated the need to have separate pellet silos for each 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 bought the primary system and after successful trials, ordered six further techniques. Over the past two years they’ve purchased more than 30 methods, with plans to order extra. The manufacturer can be thinking about having Zenith conduct annual subject calibrations of every system.
After two years of operation, the producer estimates a yearly savings of approximately $480,000 per skid in operation. With 30 skids now operating, the return on funding for every system buy may be measured in weeks. To date, there have been no odor complaints since the customer installed the Zenith systems

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