บทความ เกจวัดแรงดัน

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 international producer of scented plastic rubbish bags was in search of 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 move rates required, whereas additionally decreasing their costs 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 another for costly pre-scented plastic pellets
A global manufacturer of scented plastic rubbish baggage was on the lookout for an alternative selection to the utilization of pre-scented plastic pellets, which required a dedicated silo for every of the 20 available fragrances. The pellets are pneumatically conveyed to each silo from both tanker trucks or rail vehicles and the manufacturer was experiencing logistical issues associated with maintaining the silos crammed. They additionally needed to carry high prices for sustaining the stock of the pre-scented pellets.
In addition, the heavily concentrated scents had been inflicting health concerns for the workers who complained of headaches. To mitigate this problem, each 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 use plain plastic pellets and apply scented oil on to the plastic sheet immediately after the extrusion course of to cut back costs, logistical challenges, and energy use. They had tried to build such a system in-house but had struggled to realize accuracy and consistency at the low circulate rates they required. They determined to seek a pump-based resolution that would directly spray perfume on the good and cozy melted sheet plastic as a outcome of the in-house resolution couldn’t 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 show noticed a working demonstration of precision gear metering pumps made by Zenith and requested software experts if the pumps could be a fit with their application. After accumulating data on the application, an area manager for the pump manufacturer with intensive experience in dosing and mixing methods visited the plant to get a firsthand view of present operations and collect additional data.
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 responsibility purposes. The pump features an accurate, repeatable, pulse free move in a compact design best for dosing components similar to colours, flavors, and fragrances.
เกจ์วัดความดัน of pump is defined as rotary as a end result of the drive shaft is rotated as in comparison with other types of pumps utilizing a reciprocating movement and can additionally be thought of to be a optimistic displacement kind because the displaced volume is constant and does not vary.
Pumping motion is achieved by filling the gear tooth spaces 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 aspect of the pump. The flow price can solely be adjusted by increasing or lowering the pace at which the shaft is rotated. The pump chosen provides precision grinding and lapping processes that lead to a precision metering instrument, producing exact, pulse-less, and repeatable fluid flow.
The pumps provide extraordinarily tight operating clearances to minimize fluid slip. Manufacturing tolerances on many parts are to +/- 50 millionths of inch with floor finishes as smooth as four micro inches or higher. The pumps are offered with an AC “closed loop” motor velocity controller to keep 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 through hardened 440C series stainless-steel, specialty handled 316 stainless-steel, and high quality software steels such as 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 choice, which might eliminate shaft leakage of fluids, increasing plant security and reducing volatile organic compound emissions. The use of a magnetic coupling additionally eliminates downtime as a outcome of mechanical seal failures and eliminates the necessity for buffer fluids.
New resolution reduces costs and presents uniform perfume distribution
The new Zenith pump system gave the scented bag manufacturer a steady, pulse free process, which ensures equal and uniform fragrance distribution. By adding the scent on to the baggage after leaving the extruder, the plastic bag manufacturer not solely eliminated the need to have separate pellet silos for each scent, but additionally eliminated the want to vent the fumes that come from the pellets as they travel from the silos to the extruders.
The manufacturer purchased the first system and after profitable trials, ordered six further techniques. Over the previous two years they have bought greater than 30 methods, with plans to order more. The producer can also be excited about having Zenith conduct annual area calibrations of each system.
After two years of operation, the manufacturer estimates a yearly financial savings of approximately $480,000 per skid in operation. With 30 skids now working, the return on funding for each system buy can be measured in weeks. To date, there have been no odor complaints because the buyer installed the Zenith methods

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