screws
Improve Production Rates Via Screw Design — Barrier vs. General Purpose vs. Melt Uniformity
I’m looking for a few good molders to help trial a new screw design, and share data and results for a future article to prove the benefits of a melt uniformity screw.
John Bozzelli
Xaloy Invests in New R&D Center
Xaloy is investing in a new R&D Facility for plasticizing equipment in northeast Ohio with aid from JobsOhio R&D Center Grant.
Read MoreHow Much L/D Do You Really Need?
Just like selecting the extruder size and drive combination, the L/D should be carefully evaluated.
Read MoreXaloy to Reopen Virginia Manufacturing Facility
The Pulaski site was closed in 2016 by former owner Nordson, which consolidated screw and barrel operations in Ohio
Read MoreNew Technology Opens a Predictive Window Onto Screw Wear
Despite their integral role in transforming pellets fed through the hopper into parts ejected from the mold, visibility into the performance, health and efficiency of screws is difficult to discern for many reasons, not the least of which being the fact they’re located inside a barrel.
Read MoreNordson Selling Screw, Barrel Business
Private equity firm Altair expects to close on acquisition during the first quarter of next year.
Read MoreFollow These Purging and Preventive Maintenance Tips for Your Screws and Barrels
Processors can extend the life of equipment and improve productivity by coupling a preventive-maintenance program for their screws and barrels with routine use of chemical purging compounds..
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How Screw Design Can Boost Output of Single-Screw Extruders
Optimizing screw design for a lower discharge temperature has been shown to significantly increase output rate.
Screw-Recovery Problems Call for Special Screw Design
In injection molding, the penalty for using a general-purpose screw in an application that has special requirements often takes the form of longer cycle times. Barrier designs can help.
Read MoreWhat You Should Know About Miniature Extrusion Screws
Very small screws have become more common with the growth of additive manufacturing. Designing such screws requires balancing their output requirements with their torque strength.
Read MoreExtrusion: Important Polymer Melting Equations for Extrusion Processors
The more you know about what happens in a screw, the more you’ll be able to work with your supplier to optimize design.
Read MoreMilacron Renews Partnership With Barr for Screw Technology
Milacron has extended its exclusive partnership to offer Robert Barr Inc. designed screws on new Milacron injection molding machines or as aftermarket add-on to existing presses.
Read MoreNordson to Open Xaloy Tech Center in Ohio
Sixth new Nordson lab will open in Austintown, Ohio, at a newly built plant for Xaloy screws and barrels.
Read MoreExtrusion: Two-Stage Screw Offers Distributive, Dissipative Mixing
New design from Davis-Standard offers outputs comparable to barrier screws at lower melt temperatures.
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Improve Quality & Productivity With Advanced Screw Design
Most molders are still running with screw designs that haven’t changed much in 30 years. But they don’t need to.
John Bozzelli
Barrier Screws: Not All Are Created Equal
Let’s take a deep dive into parallel and crossing types and see where each fit in.
Read MoreWhy Barrel Temperatures Have a Small Effect on Melt Temperature
Extruders are not like ovens. Tweaking barrel-temperature profiles will not influence melt temperature all that much. Here’s why.
Read MoreSimple Scale-Up Calculations for Melting
You can avoid complicated melting equations when designing or evaluating a screw by using simpler methods that can save time and provide good results.
Read MorePartner Sought for Commercialization of "Revolutionary" Extruder for Recycling
The cylindrical extruder developed by VTT could revolutionize processing of recyclable materials including plastics, textiles and food waste.
Read MoreExtrusion: Compact Extruder Is Potent, Energy Efficient
Small-footprint machine reportedly uses up to 95% less energy/lb of material processed and can typically achieve dimensionally stable product within 20 min. of being turned on.
Read MoreUnraveling the Complexity of Single-Screw Scale-Up
Variables such as shear rates, melting rate, residence time and conductive heating are all influenced in the scale-up.
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Take the Guesswork Out of Determining Screw, Barrel Wear
New technology from Glycon takes real-time measurements of screw and barrel wear and provides data to guide processors as to when the time may be right to swap out these components.
Jim Callari
Editorial Director, Plastics Technology
Telltale Signs of Screw Wear
Determining the cause of wear is the first step in eliminating it.
Read MoreExtrusion: A Simple Way to Evaluate Your Screw Performance, Part 2
A hand-held calculator and some basic equations can help determine whether your screw is up to snuff.
Read MoreExtrusion: A Simple Way to Evaluate Extruder Screws
While there’s lots of data that influences screw design, processors usually don’t have access to it. So instead, try calculating drag flow to see if your screw is working properly.
Read MoreExtrusion: Barrier Screws: Metering Section or Not?
A barrier screw without a metering section can reduce output and increase melt temperature.
Read MoreExtrusion: Understanding Weld Failures
Hard-surfacing failures without evidence of burrs indicate possible weld bond issues.
Read MoreWhat is Your Extruder Trying to Tell You?
Being in tune with your film extrusion equipment will allow you to identify issues before they start impacting production.
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