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Vacuum Pumps: What are the types, and which type is right for your conveying needs?
There are three major types of pumps used to power vacuum-driven conveying systems. They are, in rough order of power and capability: Regenerative pumps Positive displacement pumps Long-distance positive displacement pumps Regenerative pumps can serve conveying systems that are small to moderate in size, up to about 450 feet in...
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Comparing Loaders and Receivers: Similarities, Differences, and Applications
Material receivers and loaders share a couple of key similarities: Depending on their configurations, both can receive, hold, and discharge hold various materials, which may include resin, regrind, or powders, or blends of materials drawn from multiple sources. Both offer multiple models: “Direct feed” or “JIT” meaning Just in Time...
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What does a purge valve do?
A purge valve is an integral component of a vacuum material conveying system that not only provides an on/off flow of material into a conveying line, but also a way to purge that conveying line with air at the end of every material loading cycle. Air purging is vital to...
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How a Cyclone Dust Collector Works and Why You Need One
Why are dust collectors needed? Dust collectors are often needed in plastics processing facilities because conventional high-speed vacuum-conveying systems move plastic pellets and flakes so quickly that some are damaged, causing dust and other problems. Pellets of soft materials may bump on conveying tube surfaces, heat up due to friction,...
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What is bulk density?
The bulk density of plastic materials influences many different operations within a plastics processing plant. So what is bulk density, anyway? Bulk density is the weight of a material based on a given volume. In the world of plastic resins, bulk density is typically expressed in one of several ways:...
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Can you leave conveying problems in the dust?
I regularly hear from processors who are generating large amounts of resin dust—sometimes hundreds of pounds each week. They collect it, shift after shift, from the dust collection bins near their conveying system’s vacuum pumps. Those producing black-colored parts might be able to utilize some of this wasted resin dust...
By Doug Brewster