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

Pump purchase return on funding may 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 luggage was in search of an various to the utilization 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, while also reducing their costs and bettering worker well being. Yearly savings are so high that the return on investment for the pump system can be measured in days.
Seeking an alternative for costly pre-scented plastic pellets
A world producer of scented plastic rubbish bags was on the lookout for an alternative alternative to the usage of pre-scented plastic pellets, which required a dedicated silo for each of the 20 available fragrances. The pellets are pneumatically conveyed to each silo from both tanker trucks or rail vehicles and the producer was experiencing logistical issues associated with preserving the silos filled. เกจวัดแรงกด had to carry excessive costs for maintaining the inventory of the pre-scented pellets.
In addition, the heavily concentrated scents had been causing well being considerations for the employees who complained of headaches. To mitigate this issue, 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 company was looking for a way to make use of plain plastic pellets and apply scented oil on to the plastic sheet immediately after the extrusion course of to minimize back costs, logistical challenges, and energy use. They had tried to construct such a system in-house however had struggled to attain accuracy and consistency on the low circulate rates they required. They decided to hunt a pump-based answer that might directly spray perfume on the warm melted sheet plastic as a outcome of the in-house resolution could not meet rigorous high quality management 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 producer attending the PackExpo show noticed a working demonstration of precision gear metering pumps made by Zenith and requested application experts if the pumps could be a fit with their application. After collecting info on the application, an space supervisor for the pump manufacturer with intensive expertise in dosing and mixing methods visited the plant to get a firsthand view of present operations and gather extra information.
Working with the pump manufacturer’s design group they developed a system answer utilizing a Zenith B-9000 Series rotary constructive displacement pump particularly designed for single stream chemical duty purposes. The pump options an accurate, repeatable, pulse free flow in a compact design ideal for dosing additives corresponding to colours, flavors, and fragrances.
This sort of pump is outlined as rotary as a result of the drive shaft is rotated as compared to other kinds of pumps utilizing a reciprocating movement and can be thought of to be a positive displacement kind because the displaced volume is constant and doesn’t differ.
Pumping motion is achieved by filling the gear enamel 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 side of the pump. The flow price can only be adjusted by growing or decreasing the pace at which the shaft is rotated. The pump selected presents precision grinding and lapping processes that result in a precision metering instrument, producing precise, pulse-less, and repeatable fluid circulate.
The pumps offer extremely tight operating clearances to minimize fluid slip. Manufacturing tolerances on many parts are to +/- 50 millionths of inch with surface finishes as clean as four micro inches or higher. The pumps are offered with an AC “closed loop” motor pace controller to hold up zero.1 p.c pump velocity accuracy.
The Zenith 9000 series pump is on the market in eleven sizes with capacities starting from .003 to 300 GPH. Wetted components are available in via hardened 440C series stainless steel, specialty handled 316 stainless-steel, and prime quality tool steels such as D2, M2, M4 and CPM-M4 to offer good corrosion and abrasion resistance.
The bag producer selected a mannequin with a magnetic drive (mag-drive) sealing option, which may get rid of shaft leakage of fluids, growing plant safety and reducing unstable organic compound emissions. The use of a magnetic coupling additionally eliminates downtime as a end result of mechanical seal failures and eliminates the necessity for buffer fluids.
New resolution reduces prices and provides uniform fragrance distribution
The new Zenith pump system gave the scented bag manufacturer a steady, pulse free course of, which ensures equal and uniform perfume distribution. By including the scent on to the bags after leaving the extruder, the plastic bag manufacturer not solely eliminated the want to have separate pellet silos for each scent, but in addition 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 first system and after profitable trials, ordered six extra systems. Over the previous two years they’ve purchased greater than 30 techniques, with plans to order extra. The producer can be excited about having Zenith conduct annual subject calibrations of each system.
After two years of operation, the producer estimates a yearly financial savings of approximately $480,000 per skid in operation. With 30 skids now operating, the return on funding for each system purchase may be measured in weeks. To date, there have been no odor complaints because the customer put in the Zenith methods

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