Achieving consistent quality in injection molding is heavily reliant on the proper handling of plastic resins. One critical aspect often overlooked is the moisture content in plastic resins, which can significantly impact the final product’s quality. In this blog post, we’ll delve into the importance of drying plastic resins before injection molding and explore best practices to ensure optimal results.

The Importance of Drying Plastic Resins 

Plastic resins, particularly hygroscopic ones like nylon, PET, and polycarbonate, have a natural tendency to absorb moisture from the environment. This moisture content can lead to various issues during the injection molding process, including:

1. Porosity: Moisture trapped within the resin can form bubbles or voids in the molded parts, resulting in defects and compromised structural integrity.
2. Surface defects: Excess moisture can cause surface imperfections such as splaying, silver streaks, or delamination, detracting from the part’s appearance and functionality.
3. Dimensional instability: Moisture-induced changes in the resin’s viscosity and shrinkage behavior can lead to dimensional variations in the molded parts, affecting their fit and function.

The Dangers of Over-Drying Plastic Resins 

Drying a material too much can lead to degradation of the resin, especially in the case of thermoplastic polymers. The degradation occurs due to the combination of heat, time, and exposure to elevated temperatures during the drying process. Here are some ways excessive drying can degrade resin:

1. Overheating: Many resins have recommended drying temperatures, and exceeding these temperatures during the drying process can cause thermal degradation. Overheating can lead to the breakdown of polymer chains, resulting in a decrease in molecular weight and, consequently, a reduction in the material’s mechanical properties.
2. Extended Drying Time: Prolonged exposure to elevated temperatures during the drying process, even within recommended temperature ranges, can contribute to resin degradation. This is particularly true for materials sensitive to heat or those with lower thermal stability.
3. Oxidation: Some polymers are susceptible to oxidation when exposed to air at high temperatures. Oxygen in the air can react with the polymer chains, leading to chain scission and the formation of by-products that may affect the material’s properties.
4. Color Change: Excessive drying can result in discoloration of the resin. This discoloration is often a sign of thermal degradation, and the change in color may indicate changes in the chemical structure of the polymer.
5. Formation of Gels: In some cases, over-drying can cause the formation of gels or agglomerates within the resin. These gels can lead to processing difficulties and negatively impact the final product’s appearance and performance.

Best Practices for Drying Plastic Resin 

There is not one standard for all resins—it’s important to review each material’s data sheet to determine optimal drying time and temperature. If you don’t have access to the data sheet, there are some tests that can be done to help determine this data as well. Here are some best practices for drying plastic resin.

1. Preconditioning:
   – Store resin in a climate-controlled environment with low humidity levels to minimize moisture absorption.
   – If resin has been exposed to ambient conditions for an extended period, pre-dry it to remove absorbed moisture before injection molding.
2. Moisture Analysis:
   – Conduct regular moisture content analysis using moisture meters or Karl Fischer titration (explained below) to quantify the amount of moisture present in the resin accurately.
   – Establish moisture content acceptance criteria based on resin type, grade, and processing requirements.
3. Proper Drying Equipment:
   – Invest in high-quality drying equipment specifically designed for plastic resins, such as desiccant or compressed air dryers.
   – Ensure the drying equipment’s temperature, airflow, and dew point settings are optimized for the resin being processed.
4. Drying Parameters:
   – Follow resin manufacturer recommendations for drying temperatures and times to prevent thermal degradation while effectively removing moisture.
   – Avoid excessive drying temperatures or prolonged exposure, as they can degrade resin properties and compromise part quality.
5. Handling and Storage:
   – Use sealed containers or moisture-proof packaging to protect resin from exposure to ambient moisture during storage and transportation.
   – Minimize material handling time to reduce the risk of moisture reabsorption before injection molding.
6. Process Monitoring:
   – Implement monitoring and control systems (like CoPilot) to track drying parameters, including temperature, airflow, and dew point, to ensure consistency and repeatability.
   – Regularly inspect dried resin for visual signs of moisture-related defects and adjust drying parameters as needed.

The Karl Fischer Titration Process

Karl Fischer titration is a method used to measure the amount of water (moisture) in a sample. Imagine you have a sponge, and you want to know exactly how much water it’s holding. Karl Fischer titration is like squeezing that sponge and measuring the amount of water that comes out.

Here’s how it works:

1. First, you take a small sample of the material you want to test, which could be anything from a liquid to a solid.
2. Then, you mix that sample with a special solution called the Karl Fischer reagent. This reagent reacts with water but not with other substances in the sample.
3. As the reaction happens, the amount of reagent used up tells us how much water was in the sample. It’s like counting how many drops of water the sponge released when you squeezed it.
4. By measuring the amount of Karl Fischer reagent used, we can calculate the exact moisture content of the sample.

Conclusion 

Properly drying plastic resins before injection molding is essential for achieving high-quality, defect-free parts. By understanding the impact of moisture on resin properties and implementing best practices for drying, manufacturers can optimize their injection molding processes, reduce scrap rates, and enhance product performance and consistency. With meticulous attention to detail and adherence to recommended guidelines, mastering resin drying can significantly contribute to overall manufacturing success in the injection molding industry.

Micro-injection molding has emerged as a revolutionary manufacturing process, providing a gateway to the creation of intricate and tiny components for various industries. This technique has gained prominence due to its ability to produce precise, high-quality, and cost-effective small-scale parts. In this blog post, we will explore the advantages and challenges associated with micro-injection molding.

Advantages of Micro-Injection Molding: 

1. Precision and Accuracy:

Micro-injection molding excels in producing miniature components with unparalleled precision and accuracy. The process allows for the creation of intricate details and complex geometries, meeting the stringent demands of industries such as electronics and medical devices.

2. Cost-Effectiveness:

Despite its advanced capabilities, micro-injection molding is often more cost-effective than alternative manufacturing methods for small, intricate parts. The ability to produce large quantities of precise components in a short timeframe contributes to overall cost efficiency.

3. Material Versatility:

Micro-injection molding supports a wide range of materials, including various thermoplastics and bioresorbable polymers. This versatility allows manufacturers to choose materials tailored to the specific requirements of the end product.

4. Reduced Material Waste:

The process minimizes material waste as it is designed for producing small parts with minimal excess material. This is especially advantageous in terms of cost and environmental sustainability.

5. Shorter Production Time:

Micro-injection molding is known for its rapid production cycle, making it an ideal choice for industries requiring quick turnaround times. This efficiency is particularly beneficial for meeting market demands and reducing time-to-market for new products.

Challenges of Micro-Injection Molding: 

1. Tooling Complexity:

Achieving precision on a micro-scale requires intricate tooling designs. The production of molds for micro-injection molding can be complex and costly due to the small size and intricate details of the parts being manufactured.

2. Quality Control:

Quality control becomes more challenging as the components get smaller. Ensuring consistency in part dimensions and properties demands advanced inspection and quality assurance techniques. One way to do that is through process control systems (such as CoPilot).

3. Material Flow and Cooling:

Managing material flow and achieving uniform cooling can be more challenging in micro-injection molding due to the reduced size of the components. Proper design and control measures are crucial to prevent defects and ensure consistent part quality.

4. Limited Material Options for Some Applications:

While micro-injection molding supports a wide range of materials, some specialized applications may require materials that are not suitable for the process. Manufacturers must carefully select materials that meet both size and performance criteria.

5. High-Cavitation Tools:

Micro-injection molding is often tied to high-cavitation tools, which bring their own set of challenges. Maintaining a balanced flow of molten plastic to each cavity is crucial for consistent part quality. It’s also vital to ensure that all cavities are filled simultaneously and uniformly, without creating defects like air traps or voids, which is a complex task to say the least.

6. Residence Time:

Residence time refers to the time that the molten plastic spends inside the barrel of the injection molding machine before being injected into the mold cavity. This parameter is particularly critical in micro-molding, where small, intricate parts are produced. Improper residence time can lead to material degradation, color and property variations, contamination, and more challenges. 

Conclusion 

Micro-injection molding stands at the forefront of precision manufacturing, offering a multitude of advantages for industries requiring small, intricate components. While challenges exist, technological advancements and ongoing research continue to address these issues, further enhancing the capabilities of micro-injection molding. Using technology, such as process control systems and cavity pressure sensors can help combat the challenges that arise from micro-molding. Need help with you’re micro-molding? We’re here!

On Friday January 26, 2024, we had the distinct honor of hosting Michigan State Representative Betsy Coffia at our headquarters in Traverse City, Michigan. The goal of this visit was for Rep. Coffia to get a better understanding of the manufacturing industry in Northwest Lower Michigan, including their needs, challenges and goals.

During her visit, significant emphasis was placed on the skills gap facing manufacturers of all types and the need for technology to fill that gap.  Rep. Coffia had the opportunity to use our latest approach to this type of technology, our artificial intelligence software, MAX.  Even though she had no prior experience using an injection molding machine, Rep. Coffia was able to diagnose that the process running on our press did not match the qualified process and then followed MAX’s step-by-step instructions to fix the problem on her own.

MAX utilizes AI technology powered by proven Master Molder® techniques to provide molders with real-time, expert guidance allowing them to keep their injection molding processes under control. This smart assistant monitors process parameters in real-time and offers troubleshooting advice to help molders rapidly resolve issues and improve productivity. Molding Automation Xperience, or MAX for short, marks a significant enhancement to the CoPilot system, demonstrating the company’s commitment to leveraging AI to deliver molders an unparalleled level of control, efficiency and quality.

“It was a pleasure hosting Rep. Coffia and demonstrating the future direction of our technology and innovation,” said  Mike Groleau, Chairman of the Board at RJG. “We are dedicated to preparing molders for tomorrow’s success while helping them overcome today’s challenges, and this was such a great way to showcase the hard work of our entire team.”

Prior to being named Michigan’s State Representative, Coffia held the title of Grand Traverse County Commissioner. She grew up in a working class family in rural Kalkaska County and has deep roots in northern Michigan.  Over the last decade, she has recruited and mentored multiple women who have run for office, including multiple Millennial and Gen-Z women now in political leadership positions.

This event was organized by Traverse Connect, the lead economic development organization for the Grand Traverse region, which supports area businesses through a combination of business attraction and retention strategies, talent development efforts and strategic coordination among partner agencies. 

“Thank you for the wonderful tour this past Friday. RJG is an exceptional organization with exceptional people,” stated Krista Esckilsen, Investor Engagement Coordinator at Traverse Connect.

“We truly appreciate Rep. Coffia and Traverse Connect for taking the time to visit RJG and learn more about the importance of technology and manufacturing businesses to the growth and vitality of our region,” stated Groleau.

We have been waiting very eagerly to announce our newest product… an AI-powered injection molding process advisor, now part of CoPilot®!

Meet MAX, the Process Advisor™. MAX utilizes AI technology powered by proven Master Molder® techniques to provide you with real-time, expert guidance to optimize your injection molding processes.

Today, molders encounter an increasingly pressing and distinctive challenge: a shortage of skilled processors to troubleshoot their injection molding processes, resulting in excessive scrap, machine downtime, and wasted engineering hours. We developed MAX to assist in bridging that skills gap and reducing waste during production.

This smart assistant monitors process parameters in real-time and offers troubleshooting advice to help molders rapidly resolve issues and improve productivity. Molding Automation Xperience, or MAX for short, marks a significant enhancement to the CoPilot system, demonstrating our commitment to leveraging AI to deliver molders an unparalleled level of control, efficiency, and quality.

MAX works to ensure injection molding processes are up and running at peak performance. MAX also helps address the skills gap while tackling molders’ needs to minimize scrap and downtime, boost efficiency, and enhance part quality.

Featuring an intuitive and easy-to-use interface, MAX offers guidance to molders by delivering step-by-step instructions for restoring a process to optimal performance. This empowers personnel on the floor, regardless of their experience, to handle process issues effectively, enabling them to make an immediate impact.

“Throughout our journey, RJG has been partnering with our clients to help their businesses achieve exceptional results by providing process control consulting, training, and technology. We understand and have consistently solved the persistent challenges they face, from the scarcity of skilled workers to the paralyzing downtime caused by unresolved process issues, as well as increased scrap rates due to process adjustments gone wrong. MAX, our AI-powered solution to these problems, integrates RJG’s proven Master Molder processing knowledge within our technology, so that clients receive actionable value that improves operational efficiency, reduces downtime and scrap, and empowers data-driven decisions that drive tangible business outcomes.”

– Jason Yoffy, Director of Product

MAX marks a significant advancement in an already feature-rich CoPilot process control system. The CoPilot allows users to:

• Monitor and control injection molding processes to ensure high quality parts
• Receive real-time, on-screen notifications when a machine is down or producing suspect parts
• Get step-by-step advice for fixing a process
• Set alarm limits and templates for process matching
• View data from each shot
• Automatically retain suspect parts and understand what happened in the process
• Access total part and process audit records
• Build efficiency through process automation

For existing RJG customers looking to transition from eDART® systems to CoPilot systems, we have launched a time-limited buy-back initiative, providing credits for their new systems. Contact us for more information and to see if your equipment qualifies.

MAX is now accessible as an upgrade to the CoPilot. Contact us for additional details on how to install it on your systems.

We are now offering a new data migration tool so eDART® users can transfer their data to the CoPilot® quickly and seamlessly, and to make it even easier, we are willing to do the data transfer for you free of charge for a limited time.

We are proud to announce this game-changing development in data transfer capabilities. You can now seamlessly transfer essential mold and process configurations and template data from the eDART system to the CoPilot, ushering in a new era of efficiency and productivity. To celebrate this exciting innovation, we are offering limited-time assistance to clients looking to make the transition.

The eDART system has long been recognized for its exceptional ability to monitor and control various aspects of the injection molding process, but we are making the transition over to the new CoPilot System. CoPilot is the industry’s latest process control system that offers complete visibility and traceability in a user-friendly platform that makes it easier than ever to fix a process, no matter your experience level.

To support you during this transition from eDART to CoPilot, we are offering limited-time assistance free of charge, ensuring a smooth onboarding experience and helping you hit the ground running without having to recreate templates on each CoPilot. Our team of experts will complete the data transfer and ensure its accuracy while working closely with you to facilitate a seamless transition.

This integration comes as part of our ongoing commitment to delivering innovative solutions that empower manufacturers to improve their production processes, enhance product quality, and drive operational excellence.

For more information about the data transfer tool or to see if you qualify, please visit: https://rjginc.com/copilot-migration/ or contact RJG Customer Support at support@rjginc.com for inquiries and support.

When you think of reducing waste, scrap comes to mind, right? Obviously that’s a huge part of it, but… only a part of it. Waste exists in all areas of processes, from scrap to machine downtime to time spent fixing processes, and everything in between. By minimizing waste, you can enhance operational efficiency, reduce costs, and contribute to environmental sustainability. In this article, we will explore effective strategies to help you reduce all types of waste in your injection molding business and achieve long-term success.

Optimize Material Usage

Material waste is a significant concern in injection molding. To minimize it, start by accurately calculating the required material quantities for each production run. Utilize scientific molding techniques to optimize the molding process, achieving high-quality parts with minimal material consumption. Implement regrind programs to recycle excess material and reduce the need for fresh resin. Consider using recycled or bio-based materials, where feasible, to reduce environmental impact further.

Implement Lean Manufacturing Principles

Adopting lean manufacturing principles can significantly reduce waste throughout your operations. Streamline your production workflow to eliminate non-value-added activities, reduce wait times, and optimize material flow. Implement just-in-time (JIT) inventory systems to minimize excess stock and reduce carrying costs. Emphasize continuous improvement, empowering employees to identify and eliminate waste in their work areas.

Conduct Waste Audits

Regular waste audits can help you identify specific areas where waste occurs and develop targeted solutions. Analyze your processes, machinery, and material handling practices to identify inefficiencies and waste generation points. Measure and track waste metrics such as scrap rates, rejected parts, and excess material usage utilizing The Hub^®. This data will provide insights into the root causes of waste and guide your improvement efforts.

Optimize Production Planning

Efficient production planning is crucial for waste reduction. Implement demand forecasting techniques to anticipate customer requirements accurately and optimize production schedules. Utilize software tools to align production orders, minimize changeovers, and reduce machine idle time. Effective planning ensures optimal machine utilization, reduces energy consumption, and minimizes waste associated with inefficient production setups.

Implement Effective Quality Control Measures

Poor quality control leads to increased waste and rework. Implement robust quality control measures to detect and prevent defects early in the production process (starting with part and mold design). Utilize statistical process control technology such as CoPilot^® to monitor and maintain consistent part quality, reduce scrap, and lower machine downtime. Train employees on quality standards, conduct regular inspections, and provide feedback loops to address issues promptly. By ensuring high-quality production, you can minimize waste associated with rejected or reworked parts.

Employee Training and Engagement

Engage and educate your employees on waste reduction strategies. Provide comprehensive training on injection molding techniques, quality control practices, and lean manufacturing principles. Trained employees are much less likely to produce excess scrap. Their ability to effectively fix processes will reduce machine downtime, scrap, and the need to bog down engineers’ valuable time. Foster a culture of responsibility and environmental awareness, encouraging employees to contribute ideas for waste reduction and process improvement.

Conclusion

Waste reduction is an ongoing process that requires a commitment to continuous improvement. Encourage employees to share suggestions and ideas for waste reduction regularly. Implement regular review meetings or Kaizen events to identify improvement opportunities and implement sustainable solutions. Celebrate successes and recognize employees’ contributions to improving operational efficiency.

By implementing these strategies, you can achieve sustainable success by reducing waste, increasing efficiency, and making a positive impact on the environment.

Next Steps

Sound a bit overwhelming? Let us help! Our new RJG SMART Method^SM will provide an in-depth analysis of the health of your organization, pinpoint areas of improvement, and create a custom plan to improve your profitability. Then we will help with implementation and ensuring your entire team is onboard.

Request a free consultation today!

Our 2024 annual RJG Mold Smart Award is now open for applications. The goal of the Mold Smart Award is to recognize injection molding companies around the globe who are dedicated to transforming their organizations through the implementation of RJG solutions.

The Mold Smart Award celebrates injection molding companies who have fully committed to improving the quality of their products, lives and world by implementing a variety of RJG solutions. We will be giving away one award in each of our global locations: The United States, Latin America, Europe, and Asia.

Award candidates are committed RJG clients who have implemented our technology, utilized training and/or consulting, and have integrated RJG into their ongoing processes and procedures. Candidates are continually seeking to address and improve their plastic injection molded parts and place a high importance on quality and efficiency.

Award winners will receive:

• A glass trophy
• Training starter package, including one free seat in Math for Molders, Injection Molding Essentials, Fundamentals of Systematic Injection Molding AND DECOUPLED MOLDING® Workshop OR $4,500 off of one in-plant training event at their facility
• Award emblem on RJG’s website
• Promotion through RJG’s social channels

“We are absolutely honored to be part of our clients’ transformation journeys, and the Mold Smart Award is one small way we can celebrate their success,” said Rob Nugent, CEO of RJG. “Our clients’ hard work, dedication and commitment to producing the highest quality products possible is such an inspiration and the reason we love what we do. This is what happens when we combine process knowledge with cutting edge process control technology.”

The winner in each global region will be announced in February, 2024. To apply, candidates must complete the Mold Smart Award application by December 31, 2023.

The 2023 Mold Smart Award winners are Molex, Technimark and Ensambles Hyson.

In the highly competitive world of injection molding, precision, consistency, and efficiency are paramount to success. To achieve these goals, more and more injection molding companies are turning to process control systems. These sophisticated solutions are rapidly becoming indispensable for any operation that aims to stay ahead in the industry. In this article, we’ll delve into six compelling reasons why process control systems are a must-have for your injection molding operations.

1. Quality Assurance

Quality assurance is the foundation of any injection molding business. Process control systems provide real-time monitoring and control of critical parameters such as temperature, pressure, and cycle times. This level of control ensures that each molded part meets precise specifications consistently. By closely monitoring and adjusting these variables, the system ensures that each molded part meets the required quality standards and specifications, minimizing defects and inconsistencies.

2. Improved Efficiency and Productivity 

Effective process control systems help optimize production efficiency, reduce material waste, and minimize energy consumption. By accurately controlling the injection molding process, manufacturers can achieve higher production yields, shorter cycle times, and improved overall equipment effectiveness (OEE), resulting in cost savings and increased profitability.

3. Regulatory Compliance

Compliance with industry regulations and standards is non-negotiable for injection molding companies, especially in sectors like automotive and medical devices. Process control systems can be configured to enforce specific process parameters and safety protocols, reducing the risk of non-compliance. Additionally, these systems maintain detailed records and audit trails, simplifying the reporting process and ensuring transparency during audits.

4. Real-Time Monitoring and Data Analysis 

Process control systems offer real-time visibility into every facet of your injection molding process. They collect extensive data, enabling operators to make informed decisions quickly. Advanced analytics and reporting tools help you identify trends, diagnose issues, and make adjustments on the fly. This proactive approach minimizes disruptions, prevents production bottlenecks, and ensures smoother operations.

5. Preventing Machine Damage and Downtime

Process control systems continuously monitor the performance and condition of the injection molding machine, detecting abnormalities, malfunctions, or deviations from set parameters. By providing real-time alerts and triggering automatic corrective actions, these systems help prevent equipment damage, reduce downtime, and minimize the risk of unexpected failures.

6. Traceability and Data Analysis

Process control systems and networks (such as CoPilot® and The Hub®) often include data logging and monitoring capabilities. They record and store relevant process parameters, production data, and quality metrics for each molded part. This builds an audit trail and allows you to pull data on every part shipped to prove its quality. You can also analyze data trends over time to rapidly troubleshoot challenges as they arise and make data-driven decisions for your business.

Conclusion

In the world of injection molding, where precision and efficiency are essential, process control systems have become indispensable tools. By investing in these systems, you can elevate your quality assurance, enhance efficiency, monitor operations in real-time, ensure regulatory compliance, and adapt to evolving needs. Ultimately, this investment not only improves your bottom line but also positions your injection molding operations as leaders in the field. If you haven’t already, it’s high time to consider process control systems as a must-have for your injection molding operations.

Want to learn more about how process control systems can help improve your injection molding organization? Contact us for a free consultation today!

Mold maintenance, while often overlooked, plays a pivotal role in the world of plastic injection molding, serving as a potent ally in the battle against waste. From minimizing downtime to extending mold life span, it is a linchpin for efficient production. Let’s delve deeper into the criticality of mold maintenance and the array of benefits it brings to the forefront of the injection molding industry.

Minimizing Downtime: 

Regular mold maintenance helps prevent unexpected mold failures, malfunctions, or breakdowns. By conducting routine inspections, cleaning, lubrication, and repairs, potential issues can be identified and addressed proactively. This reduces unplanned machine downtime, ensuring continuous production and minimizing waste caused by production interruptions.

Extending Mold Life Span:

Proper maintenance practices, such as cleaning, polishing, and preventive maintenance, help prolong the life span of the mold. This reduces the frequency of mold replacements, which can be expensive and time-consuming. A well-maintained mold can produce high-quality parts consistently over a longer period, minimizing waste associated with mold replacement and setup.

Preventing Defects and Scrap:

Regular maintenance allows for the detection and correction of mold-related issues that can lead to part defects and scrap. For example, worn or damaged mold components can cause flash, sink marks, warpage, or dimensional inaccuracies in molded parts. By addressing these issues through maintenance, the occurrence of defects and subsequent waste can be significantly reduced.

Optimizing Mold Performance:

Ensure that the mold operates at its optimal performance levels by doing regular inspections and adjustments to help maintain proper alignment, cooling efficiency, and ejection mechanisms. This enables the mold to produce parts with consistent quality, reducing waste from rejects, rework, and substandard products.

Enhancing Process Stability:

Well-maintained molds contribute to stable and reliable injection molding processes. By minimizing variations in mold performance, such as cavity-to-cavity variations or inconsistent fillings, the process becomes more predictable and controllable. This results in reduced process waste, including material waste, energy consumption, and scrap.

Supporting Process Optimization:

Mold upkeep provides an opportunity to identify areas for process improvement. Through maintenance activities, mold operators and technicians can gather valuable data, identify recurring issues, and implement corrective actions. Continuous improvement initiatives based on maintenance insights can lead to waste reduction by optimizing cycle times, reducing rejects, and enhancing overall process efficiency.

Conclusion

In conclusion, mold maintenance is a critical aspect of plastic injection molding that should not be underestimated. Its impact on waste reduction and overall production efficiency is significant, offering numerous benefits to manufacturers. By ensuring regular inspections, cleaning, and adjustments, downtime can be minimized, and mold life span can be extended, leading to cost savings and consistent high-quality parts. Moreover, by preventing defects, optimizing mold performance, and enhancing process stability through proper upkeep, manufacturers can achieve greater process efficiency and waste reduction. Embracing mold maintenance as an integral part of the injection molding process paves the way for a sustainable and thriving manufacturing industry.