Combat the skilled labor shortage using this comprehensive resource to train your own plastics processing experts.
Deep dive into the basics of blending versus dosing, controls, maintenance, process integration and more. injection mold cad design
This Knowledge Center provides an overview of the considerations needed to understand the purchase, operation, and maintenance of a process cooling system.
Learn about sustainable scrap reprocessing—this resource offers a deep dive into everything from granulator types and options, to service tips, videos and technical articles.
While PE price reductions were not as apparent, they too were following the year-end price trajectory of PP, PS, PVC and PET.
Going into fourth quarter, prices of the five commodity resins were heading downward, barring supply interruptions.
This month’s resin pricing report includes PT’s quarterly check-in on select engineering resins, including nylon 6 and 66.
While prices moved up for three of the five commodity resins, there was potential for a flat trajectory for the rest of the third quarter.
By most measures, pricing for the five commodity resins appeared to be holding firm going into the third quarter.
Second quarter started with price hikes in PE and the four volume engineering resins, but relatively stable pricing was largely expected by the quarter’s end.
Resin drying is a crucial, but often-misunderstood area. This collection includes details on why and what you need to dry, how to specify a dryer, and best practices.
Take a deep dive into all of the various aspects of part quoting to ensure you’ve got all the bases—as in costs—covered before preparing your customer’s quote for services.
In this collection of articles, two of the industry’s foremost authorities on screw design — Jim Frankand and Mark Spalding — offer their sage advice on screw design...what works, what doesn’t, and what to look for when things start going wrong.
In this collection, which is part one of a series representing some of John’s finest work, we present you with five articles that we think you will refer to time and again as you look to solve problems, cut cycle times and improve the quality of the parts you mold.
Gifted with extraordinary technical know how and an authoritative yet plain English writing style, in this collection of articles Fattori offers his insights on a variety of molding-related topics that are bound to make your days on the production floor go a little bit better.
In this three-part collection, veteran molder and moldmaker Jim Fattori brings to bear his 40+ years of on-the-job experience and provides molders his “from the trenches” perspective on on the why, where and how of venting injection molds. Take the trial-and-error out of the molding venting process.
Mike Sepe has authored more than 25 ANTEC papers and more than 250 articles illustrating the importance of this interdisciplanary approach. In this collection, we present some of his best work during the years he has been contributing for Plastics Technology Magazine.
In this collection of content, we provide expert advice on welding from some of the leading authorities in the field, with tips on such matters as controls, as well as insights on how to solve common problems in welding.
Mold maintenance is critical, and with this collection of content we’ve bundled some of the very best advice we’ve published on repairing, maintaining, evaluating and even hanging molds on injection molding machines.
Thousands of people visit our Supplier Guide every day to source equipment and materials. Get in front of them with a free company profile.
Customizable equipment solutions, warm hand-off support, and seamless software integrations highlight Taiwan’s plastics show.
Recycler equips for new business in medical, housewares and carpeting.
Medical device manufacturer Curiteva is producing two families of spinal implants using a proprietary process for 3D printing porous polyether ether ketone (PEEK).
Biopolymers like PLA and PHA are able to meet sustainability goals while also delivering the performance attributes needed in rigid food packaging. Here’s what testing has shown.
The MFI tester enables collection of meaningful pressure data in transducers in a relatively short time, providing realistic measures of the response time of a pressure transducer. This information is critical in the interpretation of pressure data measured in an extrusion process.
Proper end-of-life outcomes for plastics are possible, if we’re willing to put in the work.
Videplast and ExxonMobil collaborated on the development of this cost-effective VSP film solution that contains no ionomers.
Software-defined equipment control systems can be duplicated, transferred and scaled with ease.
The same year it marked its 70th year in business, custom injection molder Hoffer Plastics (South Elgin, Illinois) — which routinely reinvests more than 10% of its annual revenue back into new equipment — prioritized automation in that CapEx with some stunning results.
How much resin is contained within a bucket, gaylord or hopper? That depends on the bulk density — a figure you need to learn how to calculate due to its impact on everything from storage and conveying to drying and molding.
The third iteration of the event takes place March 18-20 in Rosemont, Illinois, providing three days of exhibits, technical education and professional networking.
Plastics Technology’s Hot Shots parts competition is accepting submissions for the 2025 contest, with winners to be announced at PTXPO 2025.
Topping five other entries in voting by fellow molders, the Ultradent team talks about their Hot Shots sweep.
Serendipitous Learning Opportunities at PTXPO Underscore the Value of Being Present.
Introduced by Zeiger and Spark Industries at the PTXPO, the nozzle is designed for maximum heat transfer and uniformity with a continuous taper for self cleaning.
Ultradent's entry of its Umbrella cheek retractor took home the awards for Technical Sophistication and Achievement in Economics and Efficiency at PTXPO.
Center will be dedicated to product engineering, materials science and manufacturing technologies.
Südpack’s Multifol Extreme film is well suited for greasy, protein-rich and frozen foods
Across all process types, sustainability was a big theme at NPE2024. But there was plenty to see in automation and artificial intelligence as well.
Exhibitors and presenters at the plastics show emphasized 3D printing as a complement and aid to more traditional production processes.
The Plastics Industry Association (PLASTICS) has released final figures for NPE2024: The Plastics Show (May 6-10; Orlando) that officially make it the largest ever NPE in several key metrics.
Discover how artifical intelligence is revolutionizing plastics processing. Hear from industry experts on the future impact of AI on your operations and envision a fully interconnected plant.
Mixed in among thought leaders from leading suppliers to injection molders and mold makers at the 2023 Molding and MoldMaking conferences will be molders and toolmakers themselves.
After successfully introducing a combined conference for moldmakers and injection molders in 2022, Plastics Technology and MoldMaking Technology are once again joining forces for a tooling/molding two-for-one.
Multiple speakers at Molding 2023 will address the ways simulation can impact material substitution decisions, process profitability and simplification of mold design.
When, how, what and why to automate — leading robotics suppliers and forward-thinking moldmakers will share their insights on automating manufacturing at collocated event.
As self-imposed and government-issued sustainability mandates approach, injection molders reimagine their operations.
August 29-30 in Minneapolis all things injection molding and moldmaking will be happening at the Hyatt Regency — check out who’s speaking on what topics today.
Get your clicking finger in shape and sign up for all that we have in store for you in 2023.
Molding 2023 to take place Aug. 29-30 in Minnesota; Extrusion 2023 slated for Oct. 10-12 in Indiana.
With the fluctuating costs of materials and the absence of technical staff, it is increasingly important to optimize your workflow and utilize equipment to the best of its ability. This webinar will cover the best blending practices by discussing the characteristics of the best blender, how to use the blender to the best of its ability and how to integrate the blender with other elements of the work cell. Agenda: Characteristics of the best blender How to use the blender to the best of its ability How to integrate the blender into other elements of the work cell
Understanding plastic material compatibility and joint design is critical to achieving optimal weld strength and meeting industry standards. Discover how to optimize joint configurations and manage material properties to enhance weld reliability, minimize defects and boost efficiency. Gain key insights to optimize your laser and ultrasonic plastic welding processes for better results. Agenda: Learn the principles of plastic material compatibility and their impact on weld strength Discover best practices for joint design to ensure optimal welding integrity Explore strategies for optimizing weld joint configurations for enhanced reliability Understand how to manage material behavior to minimize defects during welding Gain insights into achieving compliance with stringent industry standards
Join this webinar to explore the transformative benefits of retrofitting your existing injection molding machines (IMMs). Engel will guide you through upgrading your equipment to enhance monitoring, control and adaptability — all while integrating digital technologies. You'll learn about the latest trends in IMM retrofitting (including Euromap interfaces and plasticizing retrofits) and discover how to future-proof your machines for a competitive edge. With insights from industry experts, it'll walk you through the decision-making process, ensuring you make informed choices that drive your business forward. Agenda: Maximize the value of your current IMMs through strategic retrofitting Learn how to integrate digital technologies to enhance monitoring and control Explore the benefits of Euromap interfaces and plasticizing retrofits Understand how retrofitting can help meet new product demands and improve adaptability Discover how Engel can support your retrofitting needs, from free consultations to execution
The aim of this presentation is to guide you through the factors and the numbers that will help you determine if a robot is a smart investment for your application. Agenda: Why are you considering automation? What problems are you trying to solve? How and why automation can help Crunch the numbers and determine the ROI
An overview on the use of chemical foaming agents (CFAs) to successfully foam single and multilayered rotational molding parts, this webinar will illustrate the multiple benefits rotational molders can achieve, including reducing resin consumption, decreasing part weight, enhancing wall thickness and improving structural rigidity. Agenda: Charging the mold Dosing ratios Venting Optimal decomposition temperatures, cycle times and drop times for drop box applications Cooling considerations
Join Engel in exploring the future of battery molding technology. Discover advancements in thermoplastic composites for battery housings, innovative automation solutions and the latest in large-tonnage equipment designed for e-mobility — all with a focus on cost-efficient solutions. Agenda: Learn about cutting-edge thermoplastic composites for durable, sustainable and cost-efficient battery housings Explore advanced automation concepts for efficient and scalable production See the latest large-tonnage equipment and technology innovations for e-mobility solutions
ANTEC® 2025, SPE's Annual Technical Conference, showcases the latest advances in industrial, laboratory, academic, and international work focused on plastics and polymer science. ANTEC® will address a range of plastics technologies, polymer research, new materials, innovative processes, and more. There will also be a focus on scientific, technical, or industrial problems and their solutions. In addition to a comprehensive program, ANTEC® 2025 will offer exceptional networking opportunities, our prestigious SPE awards, symposiums, and our exclusive ANTEC® All-Access VIP Experience.
The International Conference on Polymers and Composites (ICPC) aims to bring together leading academic scientists, researchers and research scholars to exchange and share their experiences and research results on all aspects of polymers and composites. It also provides a premier interdisciplinary platform for researchers, practitioners and educators to present and discuss the most recent innovations, trends, and concerns as well as practical challenges encountered and solutions adopted in the fields of polymers and composites.
Each year Products Finishing partners with thousands of finishing operations in the U.S. to celebrate National Surface Finishing Day (NSFD) on the first Wednesday in March. NSFD is designed to celebrate and showcase the industry to trade schools, businesses, officials and media, as well as to celebrate employees and staff. The overarching goal of NSFD is to bring further awareness to the important roles plating and coating facilities play in their communities. Facilities are encouraged to host events and work with local media to build awareness about the contributions made by the surface finishing industry. For a helpful guide to reaching out to media outlets, download the NSFD toolkit here. How can you celebrate? Share your company’s story Hold an open house where the public can check out your facility –— either in person or virtual Offer student shop tours to local trade schools Invite local elected officials to visit and get to know your staff Celebrate your employees Share news about what you’re doing on social media and use the hashtag #NationalSurfaceFinishingDay or #NSFD
In its 25th edition, Plastimagen seeks to reaffirm itself as the main gateway to the plastics sector in Mexico and Latin America. This event will bring together a variety of prominent plastics industry leaders, including capital goods producers, raw material suppliers, investors, organization representatives and members of academia. The main objective of the event will be to promote the transformation of the industry towards a more sustainable model. This will be done by seeking to facilitate robust economic development, and providing solutions aimed at achieving a circular economy. PLASTIMAGEN® MEXICO is the biggest international exhibition for the plastics processing industry in Mexico and Latin America. This event brings together the entire production chain with top suppliers to meet the needs of various industries. PLASTIMAGEN® MEXICO 2025 will feature over 870 companies representing 1,600 brands from more than 27 countries, 14 international pavilions, and a specialized pavilion by the National Association of Plastics Industries in Mexico (ANIPAC). You'll see the latest in plastics processing, design innovations, and materials that support the circular economy.
PTXPO 2025 is a comprehensive showcase of cutting-edge technologies and innovations within the plastics molding industry. Join fellow molders, moldmakers, brand owners, OEMs and their full suite of suppliers in Rosemont, IL for three days of non-stop networking, education and business development opportunities.
Critical Cleaning Hands-on Workshop Do it; learn it! The one-day workshop teaches how cleaning and cleanliness testing work. By participating in hands-on exercises of techniques for cleaning and cleanliness verification, attendees gain the understanding and knowledge to make practical, effective, and sustainable manufacturing decisions. While exercises are supplemented by demonstrations and tutorials, the workshop is not death by PowerPoint! Topics include aqueous, solvent, and “non-chemical” cleaning, including cleaning chemicals and cleaning processes (spray, ultrasonics, cyclic nucleation, in-line, batch). Most manufactured product and product contact surfaces require cleaning during (and sometimes after) manufacture and assembly. Examples of areas where effective cleaning is essential include: metal fabrication, product assembly, optics, electronics, microelectronics, wafer fab, medical devices, aerospace/aeronautics, military, and additive manufacturing. WHAT DO YOU CALL CLEANING? There are many different terms for cleaning. Cleaning Precision Cleaning Critical Cleaning Safety/Critical Cleaning Surface Prep for Finishing Technical Cleanliness Residue Removal WHO WILL BENEFIT FROM THE WORKSHOP If you or your company fabricates, finishes, maintains or repairs product or product contact surfaces (like reaction vessels), this workshop is time well-spent. If you sell chemicals or cleaning equipment, this workshop will help you better understand and optimize the market for your products. Examples include: Manufacturing Engineers Product Designers Managers Sales and Marketing Managers Facilities Personnel Assemblers, operators Process Technicians Quality Control Personnel Regulatory Affairs Experts (industry, military, and government) Safety/environmental professionals Participants will receive a PDF Certificate of Completion with continuing education credits from Sam Houston State University.
Molding simulations show that adding an overflow well to a part can mitigate the impact of glass fibers on weld-line weakness.
Weld lines are a well-known weak point in molded plastics, though it may be less well known that fiber reinforcements added to strengthen parts overall can exacerbate that weld-line weakness. Can the addition of an overflow well mitigate that disadvantage? Amanda Nicholson, customer success engineer at Moldex3D North America, undertook a simulation study to find out.
Recently hired at plastic injection molding simulation software provider Moldex3D, Nicholson was spurred to undertake the research study following a conversation with a customer experiencing weld-line woes. “I realized weld -line problems are a very common issue for injection molded parts,” Nicholson told Plastics Technology.
The purpose of her study was to simulate the effect on modulus that adding an offset overflow well would have on parts molded from a semi-crystalline, glass-fiber filled thermoplastic. In her research, Nicholson noted that adding glass fibers to a resin can intensify the mechanical property loss at the weld line since the fibers essentially crowd out polymer chains in the melt, reducing the potential for chain entanglement, which imparts strength across the weld line. Nonuniform fiber orientation at the weld line can further contribute to a loss of strength and stiffness.
FIG 1: Moldex3D used three tensile bars to simulate the impact of adding an overflow well (model 3) to deal with glass fibers further weakening the weld line created in Model 2 by having two gates. Model 1 with a single gate acted as the control. End of fill (shown in red) shifts from the end of the part opposite the single gate to the center of the part with two gates, to the end of the tab formed by the overflow well in Model 3. (All images: Moldex3D)
In the study, Nicholson used a 35%-glass-filled nylon 66 and three different 1/8-in.-thick ASTM Type I tensile-bar models—one single-gated at the bottom, one with two gates (top and bottom) and a third with two gates plus an offset overflow well on its side (Fig. 1). The overflow well was 66.67% of the wall thickness. “In this case, the overflow well was quite large relative to the small part,” Nicholson says. In addition to measuring two-thirds of the wall thickness of the part, the length of the tab was extended to ensure there was sufficient flow through the weld line to help reorient the glass fibers. With this design, the overflow tab made up 9% of the overall part, excluding the gate and runner system. “The overflow tab should be optimized for each part,” Nicholson notes, “and this value will vary greatly depending on the part size.”
In simulating the three tensile bar variations, end of fill (EOF) occurred at the end of the bar opposite the lone gate in the first model (Fig. 1); at the weld line in the center of the bar in the second model with gates on either end, and in the overflow well in the third variation. Nicholson notes that having EOF in the well is important, since it means material will still flow through the center of the part after the weld line first forms. Referred to as “underflow,” this filling acts to reorient the glass fibers, which increases major modulus along the length of the part (watch an animation of underflow). “If the overflow well were to fill before the weld line was formed, no underflow would occur,” Nicholson states. While adding an overflow well can shift the weld-line’s location, in this instance it had no affect.
FIG 2: Moldex3D’s Particle Tracer shows the flow length of particles originating from either the melt entrance or the weld line.
Nicholson was able to verify the “underflow” by utilizing Moldex’s Particle Tracer function (Fig. 2). This function tracks the movement of imaginary discrete “particles” of melt during part filling. While the second model showed negligible particle flow length after weld-line formation, the third model showed movement of particles through the center of the part into into the overflow well, which serves to change glass-fiber orientation and increase polymer chain entanglement. Moldex’s Fiber Orientation modeling also verified a beneficial effect of the overflow well. Figure 3, the fibers in the single-gated part show a high degree of orientation along the direction of flow. In the double-gated part, the fibers tend to re-orient perpendicular to the major flow direction at the weld-line location, contributing to the weakness at that spot. With addition of the overflow well, the simulation shows strong flow-direction orientation of glass fibers through the weld line.
FIG 3: In the three bars, Moldex3D shows how the different designs impact fiber orientation, with a high degree of orientation at the weld line in the third model with the overflow well.
Nicholson used Moldex3D to simulate the value of the major modulus (stiffness in the direction of flow) for the three tensile bars (Fig. 4). Compared with the control part (single gate and no weld line), the double-gated part showed a major-modulus reduction at the weld line from 1,376,800 psi down to 898,593 psi—a roughly 35% reduction in stiffness. The addition of the overflow well increased the major modulus at the weld-line location to 1,155,520 psi—just 16% less than the control tensile bar.
Nicholson says the purpose of the study was to address any glass-filled part that has weld lines, whether they’re the result of multiple gates, features like holes, or non-uniform wall thicknesses. “It is ideal to design parts with no weld lines,” Nicholson says, “but that is not always realistic.”
If an overflow well is the best option, Nicholson notes there are multiple methods to incorporate them into a part. “The best-case scenario would be to design it into a part feature or put it in a non-cosmetic, non-functional area where it isn’t required to be removed,” Nicholson advises. Short of that, the well tab could be taken off manually or removed automatically, via a degating system.
If an overflow well is not an option, and the usual tricks deployed to orient fibers in a weld line—such as increasing mold and melt temperature, boosting pack pressure or adding venting—don’t work, there are other options.
“Gate-location changes, flow leaders, flow restrictions and sequential valve gates are other examples of strategies that can be employed to influence weld-line location and fiber orientation,” Nicholson notes.
(Editor’s note: For comments on weld lines and overflow wells by injection molding consultant John Bozzelli, visit https://short.ptonline.com/weldline. To read more on this topic, you can also check out this research article in Polymer Composites.)
FIG 4: Moldex3D simulations show that compared with the control bar with a single gate, the major modulus of the third model with an overflow well showed less of an impact from the creation of a weld line.
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