material separation

Jeff Hochadel

The Nitty Gritty of 3D Printing & Powder Sieving

Jeff Hochadel
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Here at HK Technologies, we have been sieving powder metal for quite some time. Our Ultrasonic Sieving Systems allow for sieving very fine atomized powders – down to 20 micron on conventional wire mesh and in some cases finer –using electroformed material provided by PrecisionForm, Inc. As the 3D printing industry has exploded, so has the need for finer powders. While I am no expert in the field of 3D printing, I have been involved in several areas requiring finer and finer mesh sieving.

Many of the 3D printing manufacturers install a very simple inline vibratory screener system in the powder feed system. These simple screeners typically sieve the powder through a 74 micron or 200 mesh screen. This insures that no large foreign objects are being fed into the powder part building process. Many times the end user needs finer powder to create the intricate parts they are producing. This powder is typically said to be +20 -25 micron powder. We are also told this powder is classified through an air classification process. The process, while quick and relatively easy, leaves a powder that is not always what it is claimed to be. When asked to check the accuracy of the particle size, we find there is almost always a significant amount, 10% or more, of finer material than claimed. Read More…

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Jack Steinbuch

What You Need To Know About Screening Media – Part IV

Jack Steinbuch
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This blog is the fourth in a series that has been dedicated to typical screening media that are installed in Vibratory Screeners with their advantages and disadvantages so you can be in a better position to assist us in the selection process.

Profile (Wire) Deck

This screening media is used primarily for dewatering applications.  Additionally this decking is used in the Coal industry for drain & rinse and desliming applications.  This decking is also utilized in screeners for the iron ore, potash and phosphate industries.

Profile decking is most often stainless steel construction, but can also be constructed from other metals.  This decking most typically consists of V-shape or triangular wire profiles that are supported in parallel on cross bars.  Read More…

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Katy Sabo

Why Recycle Glass? The Answer Is Clear

Katy Sabo
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Remember the days of “Tube TVs” and “Low Radiation” computer screens?

I remember walking into Cleveland Vibrator and seeing, what I would describe as, the land of misfit computer screens that had been stored away through the many years that Cleveland Vibrator has been in business. One day they disappeared and the land of misfits was replaced by trade show accessories. Working here has opened my eyes to the many industries that don’t get the attention they well deserve, especially recycling. Recently, I was invited to visit a customer whose specialty was Glass Recycling of old TV screens and computer monitors. Ding, ding, ding, the lightbulb went off… this is where those “misfits” disappeared to. This got me thinking, what exactly can recycled glass be used for?

The glass used for these old monitors and displays is referred to as CRT, Cathode Ray Tube Glass, and it is estimated that the typical CRT device is made up of between 15 to 90 pounds of glass (depending on device) that protects the users from the radiation produced by the electron gun and beam gun inside that device. Since the emerging high demand of LCD, LED and Plasma Screens of the 2000s, it is an estimated 57 million computers and televisions are sold annually in the U.S. according to U.S. Environmental Protection Agency. Households are now discarding old models of outdated technology at a much higher rate than we have ever seen before. Read More…

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Jack Steinbuch

What You Need to Know About Screening Media – Part Deux

Jack Steinbuch
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This blog is the second in a series that will be dedicated to typical screening medias that are installed in Vibratory Screeners. I will discuss their advantages and disadvantages so you can be in a better position to assist us in the selection process.

Perforated Plate

This is also a fairly common and widely used screening media for many applications including scalping, sizing and dewatering.  Perforated plate, as relates to sections installed in vibratory screeners, is typically designated by the openings, the bar width (amount of material between the openings), centers (distance between the holes as well as staggered or straight line) and thickness. Read More…

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Jack Steinbuch

What You Need To Know About Screening Media: Woven Wire Cloth, Part I.

Jack Steinbuch
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There are a wide variety of screening media that can be installed in vibratory screeners.  Our challenge is to select which type would be best suited for your application.  You can refer back to my blog: Importance of screening data from May 2013 to review the technical data that would best assist us in making screener recommendations.  Some of this data would also be appropriate for selecting screening media. This blog is the first in a series that will be dedicated to typical screening media that are installed in Vibratory Screeners with their advantages and disadvantages so you can be in a better position to assist us in the selection process.

Woven Wire Cloth

This is the most common and widely used screening media for many applications including scalping, sizing and dewatering.  Woven wire cloth is typically designated as space screen (clear openings) or square mesh.  Space screen is the inside dimensions of the opening which should be further designated with a specific wire diameter.  Please note that the wire diameter doesn’t affect the screen opening Read More…

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Jeff Hochadel

Powder Metal Fine Mesh Screening Customizations

Jeff Hochadel
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As a custom equipment manufacturer, we have quite a bit of flexibility in what we can offer.  Sometimes a screening application calls for requirements that a standard vibratory screener just cannot accommodate.

Recently, a customer asked us to redesign his powder metal screening operation in order to provide additional headroom for an additional piece of equipment. His application requirements were vacuum, two deck screening and ultrasonics on both screen decks PLUS he wanted to increase production. He currently was also Read More…

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Jack Steinbuch

The Importance of Getting All the Data for Screening Applications

Jack Steinbuch
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We receive numerous requests for Screeners where the effective screening area has been specified by the customer.  While a decent amount of these requests work out to the best of our knowledge (since not everyone is willing to admit that they may have erred in their request), we do offer to review the application to confirm that the screening area is adequate if sufficient data is provided.

Our challenge in this instance is to get the customer to provide us with the information we require to determine the optimum size, and Read More…

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