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Machine Guards Get in Your Way?

By: Matthew H. Naitove 10. May 2016

 

Easier access to the point where a robot deposits parts on a conveyor—that’s what Carl Morris, president and founder of Itech in Arden, N.C., is looking for.

 

At his new plant expansion at the Itech South facility in Westminster, S.C., he will replace “hard” metal-screen guarding around the robot drop point with vision cameras that will detect when a human enters the safety zone and halt the robot. That way, there’s no delay to open up the guarding if an operator or technician needs to get to that location. This is just one element of his plans for increased automation at Itech and Itech South.

 

For more on the latest doings at Itech South, see my On-Site feature in the upcoming June issue.

Carl Morris, Itech, Arden, N.C.

Rethinking the Injection Screw: Is It a Trend?

By: Matthew H. Naitove 4. May 2016

Renowned screw designer Robert F. Dray wrote to me recently, lamenting that injection molding screw design has not received the kind of attention that the extrusion industry has paid to perfecting this fundamental processing component.

 

“It is unfortunate that the injection molding industry has not placed the emphasis that is should on screw design and the advantages of lower melt temperatures with advanced screw design,” Dray said.

 

Things may be changing. In fact, it seems to be growing almost fashionable to question the very foundations of injection screw design that have been accepted for the past 60 years.

 

Item: Spiral Logic Ltd. of Hong Kong has developed a zero-compression screw that turns conventional wisdom on its head: Melting the resin is accomplished entirely by conductive heating from the heater bands, not by frictional shear. This is said to cure numerous ills: inconsistent melt temperature, pressure, density, and viscosity, as well as resin degradation and resulting “black specks.” One precision molder of medical parts, Makuta Technics, Shelbyville, Ind., swears by the SL screw. It and its associated molding company in Japan have equipped more than 100 machines with this technology. Makuta uses Sumitomo (SHI) Demag all-electric machines (Strongsville, Ohio), which are available with the SL screw. (Learn more about the SL screw here and about Makuta here.)

 

Item: A somewhat similar conclusion was reached by Xtrude2Fill in Loveland, Colo., which also exclusively uses conductive heating rather than frictional shear to melt the resin in the barrel. This is only one unusual aspect of an unconventional machine design that uses a fixed screw to extrude into the mold—essentially taking the injection out of injection molding. The concept was presented at our Molding 2016 Conference in March (see here for a report).

 

Item: Bob Dray’s firm, R. Dray Mfg., Hamilton, Tex., has addressed what it sees as the deficiencies of conventional injection screw design with the new All-Purpose Screw (APS). Dray says this special mixing screw (see photo), which can be easily modified to process a wide range of resin types and melt viscosities, offers the flexibility promised, but not delivered, by the so-called “general-purpose” injection screw, which Dray calls the “no-purpose” screw. (An exclusive in-depth report will appear in our June issue.)

R. Dray Manufacturing all-purpose screw

Are You Up to Speed on One of the Hottest Areas of Plastics Molding?

By: Matthew H. Naitove 2. May 2016

Answer that question with a definitive “Yes” by registering to attend “Thermoplastics Composites for Automotive” (TCC Auto 2016) on June 15-16 at the Suburban Collection Showplace in Novi, Mich.

 

Presented by Plastics Technology magazine and CompositesWorld, sister publications within Gardner Business Media, TCC Auto 2016 will provide cutting-edge information on lightweighting, cost reduction through automation, and new approaches to automotive production for injection molders and composites fabricators. TCC Auto 2016 will be concurrent with the Amerimold 2016 show and conference, presented by Gardner’s MoldMaking Technology magazine.

 

This is only the second presentation of this unique conference. The first, in 2014, was literally a standing-room only event, with over 250 attendees. This year, over a day and a half, we’ll present 22 speakers on topics in Applications & Materials and Machinery & Processes for thermoplastic composites.

 

Machinery & Processes will present the following opportunities to evaluate state-of-the art technologies for getting in on the action in developing applications for automotive—and aerospace, electronics, and more:

 

 •  The RTM Process Family of Lightweight Construction Processes, Phillip Zimmerman, KraussMaffei Technologies GmbH. This machinery producer has pushed ahead with development of high-pressure resin transfer molding (HP-RTM) as a method of mass production with high fiber volumes (above 50%) and continuous fibers. You’ll learn about C-RTM, which adds a low-pressure compression stroke. It reduces capital investment and is already in use for series production of auto parts. Other topics are Wet Molding as a second life for recycled fibers, and T-RTM, polymerizing low-viscosity liquid caprolactam in the mold to produce a solid nylon 6 composite.

 

 •  Tailored Fiber Placement LFT-D, Louis Kaptur, Dieffenbacher Canada. The process of producing long-fiber thermoplastics directly from continuous fiber rovings (LFT-D) is already used for non-structural automotive parts such as underbody shields and covers. The next step is the transition to structural components by adding automated layup of continuous-fiber tapes.

 

 •  New Out-of-Press, Out-of-Autoclave Molding Technology for TP Composites, Lionel Schaaf, RocTool. Light Induction Tooling is a new molding technology using thin-shell metal molds and induction heating to produce large parts at low energy cost and reduced cycle times.

 

 •   Quilted Stratum Process, Andrew Rypkema, PEI Pinette USA. QSP is a new approach for automated manufacturing of high-performance TP composites, using continuous carbon fiber. It is said to offer low cost and short cycle times.

 

 •  Weld-Line Strength Prediction Through Combined Manufacturing & Structural Simulation, Brady Adams and Matt Jaworski, Autodesk, Inc. The author will present a mathematical model for predicting weld-line strength in fiber composites by using the manufacturing process history, as well as a strategy for transferring the weld surface strengths to a structural simulation. Correlation of predicted results to experimental data will be provided.

 

 •  Methodology Development for Experimental and Numerical Rheology Studies on the Plasticating Effect in Microcellular Foam Composites, Marcel Holzner, Fraunhofer Project Centre for Composites Research. Here’s how use of dissolved supercritical nitrogen gas in 20% long-glass PP improves flow and mold filling. Autodesk Moldflow predictions of this process will be presented.

 

 •  Teijin’s Thermoplastic Composite Material Technology, Yutaka Yagi, Teijin Advanced Composites America, Inc. Sereebo is the name of a family of carbon-fiber reinforced TP materials (CFRTP), including materials for primary automotive structures and long-fiber pellets (Sereebo P-series). The materials are said to offer high levels of energy absorption and 60-sec cycles. This will be a special opportunity to learn about these materials and Teijin’s manufacturing process, as well as CAE modeling of static and dynamic properties, including prediction of crash behavior.

 

 •  Process Simulation for Long-Glass Injection Molding TP Composites: Predicting Damage and Orientation, Gabriel Geyne, Sigma Plastic Services, Inc. The latest software can predict the distribution of ultimate fiber lengths and orientation in molded parts.

 

 •  Validating Long-Fiber Reinforced Thermoplastics Using Industrial Computed Tomography (CT) Scanning, Andrew Good, Jesse Garant Metrology Center. Advanced, non-destructive inspection using x-rays provides visual confirmation and analysis of the distribution and orientation of fibers in molded parts.

 

 •  BAAM—How Big-Area Manufacturing is Changing Business, Richard Neff, Cincinnati, Inc. Oak Ridge National Laboratory and Cincinnati, Inc. have collaborated on the prototype of a very large 3D printer that can incorporate carbon fibers in large, structural parts. Learn about such projects as the 3D printed Shelby Cobra and Local Motors cars, a printed house, U.S. Army utility vehicle, and aerospace fabrication tooling.

 

 •  Advanced Compression & Injection Molding of Complex Components from Neat & Reinforced Thermoplastics, Chris Huskamp, Surface Generation Ltd. PtFS advanced heating, cooling, and process controls apply to injection and compression molding for automotive, aerospace, and consumer electronics. PtFS combines hardware and software to provide what’s called the first “digital molding environment” where “active thermal management” reportedly provides large reductions in energy consumption and enables filling of thin walls, elimination of weld lines and sinks, abrupt transitions between thin and thick sections, and high fiber loadings.

 

 •  Reversible Bonding: Efficient Fabrication, Disassembly, and Repair of Automotive Components, Mahmoodul Haq, Composite Vehicle Research Center, Michigan State Univ. College of Engineering. Newly discovered technology using ferromagnetic nanoparticle reinforced thermoplastic adhesives can bond dissimilar materials and allow fast, convenient part replacement and repair.

 

 •  Thermoplastic Tape Mchinery: Bringing Standardization to the Process, Matt Litzler, C.S. Litzler. Producing thermoplastic unidirectional tape has until now meant homemade machinery systems for small-scale production. Litzler is building on 63 years of prepreg machinery experience to bring standardization to this relatively new composites process. Industry is looking for “plug-and play” machinery similar to the standards for hot-melt thermoset tape systems.

 

Go here for more information on the conference agenda, registration, and hotel.

KraussMaffei Purchase Another Sign That China Will Remain a Tough Competitor

By: Matthew H. Naitove 11. January 2016

One hears talk lately about how China is supposedly losing its killer edge as a global exports powerhouse. It has an aging population, rising wages, slowing economic growth, a shift in emphasis toward internal consumption, and recent upsets in financial markets.

 

There’s truth in all of that, but something else is going on, too. It has been widely observed that China is shifting from its initial emphasis on high-volume commodity products toward higher-quality manufactured goods. It’s part of the state-sponsored “Made in China 2025” 10-year plan to upgrade China’s manufacturing to make it competitive with countries like Germany and withstand growing competition from even lower-cost, less developed countries in Asia.

 

Speaking of Germany, China National Chemical Corp., the largest chemicals group in that nation, announced today that it agreed to purchase the KraussMaffei Group of Germany for a little over a $1 billion (see Starting Up). KM CEO Frank Stieler linked the purchase to the higher-quality trend in China, stating that this is the sort of manufacturing to which KM machines are suited.

 

What this means, to my mind, is that North American plastics processors will have to keep hustling to keep ahead of Chinese competitors. Many processors profiled in this magazine’s “On-Site” reports have said they stay competitive through continuing investment in automation and the most advanced molding and auxiliary technologies. But topnotch machinery from Europe and the U.S. is selling well in China, and U.S. observers see growing competence in precision molding, multicomponent molding and other sophisticated technologies. One U.S. molder recently shipped an automated, multi-station assembly cell to its Chinese plant to make medical products (though for domestic use, not export). And despite numerous reports that some Chinese molds are not up to Western standards, molders and moldmakers here see a growing number of Chinese sources of high-quality tooling, often as a result of partnerships with, or ownership by, North America companies.

 

All of which says there’s no way out of the continuous-improvement race. Got to keep peddling, faster and faster.

 

KraussMaffei plastics injection molding machines

Ten Intriguing Injection Molding Technologies of 2015

By: Matthew H. Naitove 5. January 2016

I know I’m leaving myself wide open on this one. I was asked, “What are the 10 most interesting injection molding technologies of 2015?” I should have pleaded eggnog hangover and politely declined.
 

Trying to answer that one is a trap on several levels: First, how do you pin a technology, which takes time to develop and commercialize, to a particular year? And then, what’s “most interesting”? I assume that will depend on your interests: Are you a custom molder, or captive? What markets do you serve—automotive, medical, packaging, you-name-it? Do you operate large machines or small?

 

With those caveats, here are some things that interested me in 2015. I couldn’t really limit it to 10, so some are areas of technology rather than a particular new development. And I call them technologies of 2015 because they were introduced commercially this past year, featured in major trade shows this year (or at least U.S. trade shows), or they simply came to my attention in that time frame. If you don’t like my selections, send me yours at mnaitove@ptonline.com.

 

Here are my picks, in no particular order:

 

Robots: Lots of interesting things appeared in the robot category this past year. NPE2015 in Orlando saw some hints from Star Automation of how onboard vision could make robots smarter and more versatile. Robots equipped to weigh parts are another interesting idea, floated by AGS at NPE and by Wittmann Battenfeld at Fakuma 2015 in Germany. NPE also showed off a “new concept” robot system from Yushin that had two arms and a third sliding, rotating gripper, for a total of 16 servo axes. And in the fast-evolving area of injection molded composites, Sumitomo (SHI) Demag demonstrated an “ovenless” approach to preheating thermoplastic prepregs using heated robot grippers at the fall Fakuma 2015 show in Germany. Also at Fakuma, more robot makers, like Hekuma, joined the movement toward “collaborative robots” that can work safely alongside people. And an entirely new category (for plastics) of robots—so-called Delta, “parallel,” or “spider” robots—made an appearance for high-speed pick-and-place applications. At NPE, Sailor Automation showed a robot that “learns” how to control vibration over a few cycles; and Engel introduced at Fakuma enhanced robot vibration control that responds to external forces in the molding process. For details, see our March NPE preview and June post-show report, as well as our December Fakuma news highlights.

Liquid Silicone Rubber: LSR continues to attract new technology. NPE saw a jaw-dropping demonstration of nine-color, eight-durometer molding by LSR specialist Silcotech on a single-barrel Arburg machine. Also shown at NPE were an auxiliary injector for LSR from MGS Mfg., a micro LSR injector from Kipe Molds, and a spiral-grooved plunger for LSR injection from Nissei America. See the June NPE report and May Close Up on the show.

Silcotech LSR coinjection mold

In-Mold Labeling: Again, NPE highlighted several interesting developments: a technique from Beck Automation that rearranges the cores on a deep-draw stadium-cup mold to greatly reduce the opening stroke; a technique demonstrated by Sumitomo Demag that produces a full-wrap label plus features that are injected through the label to project beyond the outer wall of the cup; partially precut labels from CBW Automation that avoid the limitations of fully precut labels or die cutting at the molding station. Fakuma 2015 demonstrated an unusually flexible and versatile IML system from Beck Automation that can quickly change the number of cavities, container size, label type, and gating method (see October Starting Up).

In-mold label (IML) fins

Coinjection: At NPE, Husky showcased its entry into the promising field of barrier coinjected food and beverage containers (see March Close Up). And Milacron marshalled technologies from its Mold-Masters, Kortec (now Milacron Co-Injection Systems), and other brands to push its Klear Can retortable PP/EVOH container closer to commercialization (see December Starting Up).

 

Mold Temperature Control: Closing one of the remaining gaps in injection process control, Engel showed its electronic water-flow monitoring and closed-loop control system at NPE, and Wittmann exhibited its version at the last two Fakuma shows (see Dec. ’14 Close Up). At NPE, Single showed off its “poor man’s variotherm” a less expensive, “passive” form of heat/cool molding (see February Close Up). An entirely new maker of mold temperature controllers offers a different approach to “passive” variotherm and standard cooling control (May Close Up). Also at NPE, Roctool used variotherm molding with its induction heating technology to push the boundaries of in-mold decorating capabilities without labels or secondary processes.

 

Melt-Temperature Control: Shining light on the long-standing “mystery” of melt temperature inside the barrel, Md Plastics offered a new type of nozzle sensor that provides a wide range of data about the state of the melt during processing; and Futaba introduced infrared melt-temperature sensors that are immune to influence by surrounding steel of the nozzle or mold. For details, see October Close Up and Keeping Up.

 

3D Printed Mold Cavities: At several recent shows, including NPE and Fakuma, companies such as Milacron, Toshiba, Boy Machines, and Hasco showed how 3D printed plastic cavity inserts offer potential for quick-turn molds that can produce up to 500 parts. See July NPE report and December Starting Up.

 

Biopolymer Molding: I was intrigued to find a processor that has built a business entirely on molding plant-based biopolymers for disposable packaging. See August Close Up.

 

Clamp Force Optimization: Just introduced by Engel at Fakuma 2015 is a system for automatic optimization of clamp force to maximize part quality while extending mold life and minimizing energy consumption.

 

Self-Cleaning Mold: High-volume PET preform molders can save hundreds of hours of mold-maintenance downtime, using a technique from Husky that’s dazzling in its simplicity. See May NPE Close Up.




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