This month’s resin pricing report includes PT’s quarterly check-in on select engineering resins, including nylon 6 and 66.

•  Shortened ejector pins with a conical tip are used to stabilize a runner from shifting or rolling over during ejection, as shown in Fig. 11.

•  Designing the mold with a separate runner bar or runner block will cost a little more but has multiple benefits—especially for long running molds.

•  Adding a short flow restrictor, as shown in Fig. 8, is not as effective as reducing the diameter of the entire runner branch.

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

Processors with sustainability goals or mandates have a number of ways to reach their goals. Biopolymers are among them.

•  If a full-round runner sticks on the cavity side of the mold, instead of using pullers, you can add undercuts on the ejection side. A teardrop-shaped undercut is best for preventing flakes or shavings, as shown in Fig. 12.

Multiple speakers at Molding 2023 will address the ways simulation can impact material substitution decisions, process profitability and simplification of mold design.

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.

Plastics Technology’s Tech Days is back! Every Tuesday in October, a series of five online presentations will be given by industry supplier around the following topics:  Injection Molding — New Technologies, Efficiencies Film Extrusion — New Technologies, Efficiencies Upstream/Downstream Operations Injection Molding — Sustainability Extrusion — Compounding Coming out of NPE2024, PT identified a variety of topics, technologies and trends that are driving and shaping the evolution of plastic products manufacturing — from recycling/recyclability and energy optimization to AI-based process control and automation implementation. PT Tech Days is designed to provide a robust, curated, accessible platform through which plastics professionals can explore these trends, have direct access to subject-matter experts and develop strategies for applying solutions in their operations.

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.

•  An edge gate or sub-gate that intentionally feeds a part on an angle is referred to as tangential gate, as shown in Fig. 5. It is often used to prevent core shifting, relocate a weld line, or improve weld strength. However, it can cause jetting inside the cavity.

While the major correction in PP prices was finally underway, generally stable pricing was anticipated for the other four commodity resins.

Sustainability continues to dominate new additives technology, but upping performance is also evident. Most of the new additives have been targeted to commodity resins and particularly polyolefins.

Ultradent's entry of its Umbrella cheek retractor took home the awards for Technical Sophistication and Achievement in Economics and Efficiency at PTXPO.

•  Some moldmakers and molders do not like to add vents until after the first sampling. This can lead to an erroneous fill pattern. At the very least, add vents at the last place to fill.

Despite price increase nominations going into second quarter, it appeared there was potential for generally flat pricing with the exception of a major downward correction for PP.

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.

•  An inexpensive way to delay the ejection of a runner (or a part), without having to incorporate a two-stage ejection system is shown in Fig. 13. The pins are well supported and have positive return. This design can help reduce flaking from sub-gated parts.

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.

•  Specify the vent locations, depths and widths on the mold drawing. Do not leave venting up to the toolmaker’s discretion.

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.

Core Technology Molding turned to Mold-Masters E-Multi auxiliary injection unit to help it win a job and dramatically change its process.

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.

The primary advantage of a 3D-printed mold is its relatively low cost. Protolabs points out, though, that “with 3D-printed molds, you’ll need to print, machine-assemble, and test a new mold every 50 to 100 shots. Aluminum tooling has no such constraints, and often see[s] service well past 10,000 shots.”

•  Always use geometrically (or “naturally”) balanced multi-cavity runner layouts. Multi-cavity molds inherently have balancing issues. Don’t compound the problem with fishbone, ladder, or other types of unbalanced runner designs.

•  If you want to increase the size of the gates, runner or sprue by some percentage, you need to run the numbers. For example, if you feel a 0.050-in. gate should be about 20% larger, don’t multiply the gate size by 1.2 and get 0.060 in. That’s not 20% larger. In terms of flow area, that’s 44% larger. An easy and correct way to determine the new gate is size is to use the following formula: DNEW = DEXISTING × √ (1 + percentage increase). In this case, it would be 0.050 × √ 1.2 = 0.055.

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

In a time where sustainability is no longer just a buzzword, the food and beverage packaging industry is required to be at the forefront of this innovation. By adopting circular packaging processes and solutions, producers can meet regulatory requirements while also satisfying consumer demand and enhancing brand reputation. Join Husky to learn more about the broader implications of the circular economy — as well as how leading brands are leveraging this opportunity to reduce costs, increase design flexibility and boost product differentiation. Agenda: The cost and operational benefits of embracing circularity Key materials in circular packaging — including rPET and emerging bioplastics How to design a circular food and beverage package Strategies for selecting sustainable closures to future-proof packaging solutions Optimization and streamlining of production processes for enhanced efficiency How Husky Technologies can enable your sustainable success

Join KraussMaffei for an insightful webinar designed for industry professionals, engineers and anyone interested in the manufacturing processes of PVC pipes. This session will provide a comprehensive understanding of the technology behind the production of high-quality PVC pipes: from raw material preparation to final product testing. Agenda: Introduction to PVC extrusion: overview of the basic principles of PVC pipe extrusion — including the process of melting and shaping PVC resin into pipe forms Equipment and machinery: detailed explanation of the key equipment involved — such as extruders, dies and cooling systems — and their roles in the extrusion process Process parameters: insight into the critical process parameters like temperature, pressure and cooling rates that influence the quality and consistency of the final PVC pipes Energy efficiency: examination of ways to save material and energy use when extruding PVC pipe products

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.

Across all process types, sustainability was a big theme at NPE2024. But there was plenty to see in automation and artificial intelligence as well.

Thousands of people visit our Supplier Guide every day to source equipment and materials. Get in front of them with a free company profile.

Additive technology creates air pockets in film during orientation, cutting down on the amount of resin needed while boosting opacity, mechanical properties and recyclability.

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.

•  One clever engineer engraved text on a family-mold runner to help the operators identify similar-looking parts for sorting and assembly, as shown in Fig. 2. Engraving the cavity number on the runner is also helpful when the parts are very small or the aesthetic requirements do not allow a cavity number on the part.

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.

•  Consider the location of any runner undercuts. They should be at or near an ejector pin to prevent the runner from bending or cracking during ejection.

•  Ideally, an ejector pin should be located at each runner intersection, because as the massive runner shrinks, it will try to stick on the inside corners.

•   Figure 4 shows two different runner designs. Both runners have sub-gates machined into the injection half of a two-cavity mold. The runner on the left is far superior to the one on the right because:

Say “manufacturing automation” and thoughts immediately go to the shop floor and specialized production equipment, robotics and material handling systems. But there is another realm of possible automation — the front office.

•  Adding redundant runner sections, as shown in Fig. 9, has only a minor effect on cavity balance. They will also narrow the processing window and increase the amount of runner scrap or regrind.

•  Keep in mind what effect the gate location and runner pattern will have on the mold. The gate and runner in Fig. 6 may be a balanced design, but it caused the cavity and core halves of the mold to rotate in opposite directions, resulting in parts that had a core-shift problem.

•  The trick to adjusting a family mold is to adjust the flow rate of the material in the runners feeding each cavity. Changing the gate depth or width only changes the fill speed (mph). It does not change the flow rate (in.3/sec). Changing the gate depth will also create different gate-seal times, which leads to parts having different packing pressures. Therefore, to correctly balance family molds, change the runner diameters to each cavity, as shown in Fig. 7.

•  “Breaking” or blending the sharp edges of the runner system will help reduce stress on the material and help prevent the runner from cracking upon ejection. Sharp edges are typically located where the sprue meets the runner, where the cold well meets the runner, where the gate meets the runner, and at every runner intersection.

While the melting process does not provide perfect mixing, this study shows that mixing is indeed initiated during melting.

Digital contract manufacturer Protolabs recently posted a blog about whether it’s better to 3D-print molds from thermoplastic or machine them from aluminum. The Maple Plain, Minn., provider of injection molding, CNC machining, 3D printing, and sheet metal fabrication services concluded, “In most cases, use 3D printing for parts—prototype or end use—but not for molds.”

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.

•  Never machine a runner on a split line of two or more mold inserts. The injection pressure will try to push the components apart, resulting in “down-flash” that could cause the runner to stick.

Start by picking a target melt temperature, and double-check data sheets for the resin supplier’s recommendations. Now for the rest...

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.

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.

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.

Performing fundamental maintenance inspections frequently assures press longevity and process stability. Here’s a checklist to help you stay on top of seven key systems.

Printed molds have their place, the blog continues, noting that some shops have had good success with them. “Proponents argue that 3D printing produces molds up to 90 percent faster and 70 percent cheaper than using traditional moldmaking processes. And while this may be true in some circumstances, it’s important to understand the pros and cons of printed plastic molds compared to those machined from metal.”

•  Add a runner overflow at each runner intersection. This is particularly important for stripper-plate molds when there is no cold well opposite the sprue. The length of the overflow should be 1.0 to 1.5 times the runner diameter or width. Overflows work very well, as shown in Fig. 3.

​​​​​​​About the Author:  Jim Fattori is a third-generation molder with more than 40 years of experience in engineering and project management for custom and captive molders. He is the founder of Injection Mold Consulting LLC  in Pennsylvania. Contact:  jim@injectionmoldconsulting.com; injectionmoldconsulting.com

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.

3. In the event of parting-line flash, the runner inserts can be skim ground and shimmed up This eliminates the need to make any other height adjustments to the cavities, interlocks, cams or shutoffs.

technotrans says climate protection, energy efficiency and customization will be key discussion topics at PTXPO as it displays its protemp flow 6 ultrasonic eco and the teco cs 90t 9.1 TCUs.

The company explained that molds made with thermoplastics-based 3D printing are “kind of like the plastic storage sheds some of us put in our backyards. They’re a little cheaper than metal sheds. They go up quickly and are fine under light loads. Pile too much snow on them, however, and they’ll collapse like a house of cards.”

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.

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.

•  Sub-gates do not necessarily have to be machined parallel or perpendicular to the runner. They can be machined on almost any angle. This is helpful when gating into a part with a radius or a steep angle, or when you want to shift a weld-line location.

Exhibitors and presenters at the plastics show emphasized 3D printing as a complement and aid to more traditional production processes.

•  The goal in balancing a family mold is to have all of the parts finish filling at the same time—not start to fill at the same time. Keep that in mind when you are making progressive short shots.

Tim and Caleb discuss the challenges of hiring and retaining employees in the metal fabrication industry, particularly at...

Addressing hot-runner benefits, improvements, and everyday issues from the perspective of decades of experience with probably every brand on the market. Part 1 of 2.

•  Avoid using sub-gates if the molding material is abrasive, or if the cavity is made of a soft metal, such as aluminum or copper. They will wear out quickly.

4. The inserts can affordably be made of a different material, such as a high-hardness tool steel for abrasive materials, or thermally conductive materials for faster cycles.

This Knowledge Center provides an overview of the considerations needed to understand the purchase, operation, and maintenance of a process cooling system.

This month I sifted through four decades of Post-It notes, hand sketches and photographs to uncover a number of worthwhile tips and tricks related to this five-part series on gates, runners and sprues. Therefore, this month’s conclusion to the series will simply be a bullet-point list of helpful information.

Join Wittmann for an engaging webinar on the transformative impact of manufacturing execution systems (MES) in the plastic injection molding industry. Discover how MES enhances production efficiency, quality control and real-time monitoring while also reducing downtime. It will explore the integration of MES with existing systems, emphasizing compliance and traceability for automotive and medical sectors. Learn about the latest advancements in IoT and AI technologies and how they drive innovation and continuous improvement in MES. Agenda: Overview of MES benefits What is MES? Definition, role and brief history Historical perspective and evolution Longevity and analytics Connectivity: importance, standards and integration Advantages of MES: efficiency, real-time data, traceability and cost savings Emerging technologies: IoT and AI in MES

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

•  For high-volume molds (about 500,000 cycles or more), consider incorporating replaceable gate inserts, especially for abrasive materials.

Plastics Technology covers technical and business Information for Plastics Processors in Injection Molding, Extrusion, Blow Molding, Plastic Additives, Compounding, Plastic Materials, and Resin Pricing. About Us

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.

Formnext Chicago is an industrial additive manufacturing expo taking place April 8-10, 2025 at McCormick Place in Chicago, Illinois. Formnext Chicago is the second in a series of Formnext events in the U.S. being produced by Mesago Messe Frankfurt, AMT – The Association For Manufacturing Technology, and Gardner Business Media (our publisher).

•  A shortened ejector pin is required for ejecting a runner puller near a sub-gate machined into the cavity side. A good puller design is shown in Fig. 10. Note how the ejector pin has a smaller diameter than the puller and how the puller has a radius and small pad on the bottom. This design will minimize the risk of getting flakes or shavings on the parting line.

•  Some runner layouts can have a heavy mass at branch intersections. These can often be cored out without affecting the material flow or pressure, as shown in Fig. 1.

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.

When, how, what and why to automate — leading robotics suppliers and forward-thinking moldmakers will share their insights on automating manufacturing at collocated event.

Across the show, sustainability ruled in new materials technology, from polyolefins and engineering resins to biobased materials.

Successfully starting or restarting an injection molding machine is less about ticking boxes on a rote checklist and more about individually assessing each processing scenario and its unique variables.

•  One reason you want all of the parts in a family mold to finish filling at the same time is so they all receive the same amount of packing pressure. If they don’t, you waste material by over-packing some cavities, which makes them heavier. Another reason is that cavities that are under-packed or over-packed will have dimensional issues because they will have a different shrinkage rate than what was used to machine the mold.

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.