Are you tired of recording massive financial losses in producing and selling plastic products? Well, it isn’t because your product idea is terrible. You’re probably just subjecting your revolutionary ideas to poor execution. And it’s because you haven’t fully capitalized on the benefits of proactive quality control. Your product’s success largely depends on the efficiency of your manufacturing process.
Plastic manufacturing is a complex process requiring the highest level of quality control. If you’d like to manufacture high-quality plastic parts that attract the right customers and sales volume, you must invest heavily in quality control. From sourcing materials to delivering the final parts, quality control measures must be implemented to ensure optimum return on investments.
Here’s everything you’ll learn in this detailed guide.
● What quality control in plastic manufacturing is;
● Quality control vs quality assurance vs quality management;
● The plastic manufacturing process;
● Why should I adopt quality control in plastic production;
● Importance of quality control in plastic production;
● Phases of quality control in plastic manufacturing;
● A step-by-step guide to integrating quality control in your plastic production process;
● And how PTI Tech can help you achieve optimum results
What is Quality Control in Plastic Manufacturing?
Quality control in plastic manufacturing is the systematic process of developing and implementing control measures to monitor, identify, analyze, and correct possible flaws and defects that can diminish the appearance, performance, reliability, and durability of plastic products and prevent them from meeting the necessary industry standards and predefined client specifications for plastic quality.
Quality Control vs Quality Assurance vs Quality Management
In plastic production, quality control (QC) focuses on improving each unit of the final output at the end of the production run. Quality control also involves conducting quality tests on the raw materials, process parameters, and final products to ascertain their compliance with the established quality assurance standards.
The difference between quality control and quality assurance (QA) is the focus. Quality assurance is the strategy designed to prevent deviations and optimize the quality of final products. Quality control, on the other hand, is a subset of quality assurance (QA). It focuses on implementing the established QA strategy in monitoring, identifying, analyzing, and recommending adjustments to quality errors in plastic products.
On a broader scope, quality management (QM) is the holistic organizational approach plastic manufacturers adopt in developing QA techniques to improve the quality of final products across all production cycles. Based on this management philosophy and approach, quality assurance becomes the set of standards, policies, and guidelines plastic products must meet before being approved for final consumption.
The Plastic Manufacturing Process
The plastic manufacturing process refers to the manufacturing techniques and activities that convert raw plastic materials to finished parts. Thermoplastic manufacturing starts when you inject the raw material into the heating chamber (barrel). These raw materials may be either synthetic or bio-based.
Synthetic plastics are made from melting and blending hydrocarbons to make pellets. These pellets are then loaded into the plastic molding machine. In most cases, an injection molding machine is used. This plastic manufacturing process is four-fold: clamping, injecting, cooling, and ejecting. Once the pellet is placed in the hopper, it dispenses it into the barrel.
The barrel melts the pellets into a liquid and the reciprocating screw pushes the liquid to the tip of the barrel from where a shot of plastic is injected into the mold cavity. The clamping unit generates enough force to keep the mold halves closed while the raw material fills the mold cavity. The injection time is completed when the material fills the cavity.
The injection time depends on the shot volume (size of the material) and the injection pressure. The molten material (liquid) is then transferred to the cooling unit to cool and harden. Once achieved, the clamping motor drive moves the solid parts to the ejection system, where the mold opens and the parts are ejected as final plastic components for immediate use.
Why Should I Adopt Quality Control in Plastic Production?
Without integrating quality control into your manufacturing process, the efficiency of the process can be compromised, which may lead to massive losses. Since plastics manufacturing follows a systematic process, the pre-production, production, and post-production phases must be inspected to prevent or correct defects and flaws in the final products.
Some of the flaws you may encounter include shrinkage, sink marks, warping, flash, burn marks, vacuum voids, jetting, short shots, flow lines, weld lines, delamination, and discoloration.
Importance of Quality Control in Plastic Production
- Quality control improves client satisfaction. When your product quality exceeds the expectations of your clients, it makes them trust you enough to become unofficial ambassadors of your brand.
- Quality allows you to reduce waste and lower the cost of production. With the evidence-based data it generates, you can optimize production efficiency. You can decide which raw materials are more economical to produce and with what machinery, skill set, and regulatory policies.
- Quality control ensures more profits for you. The more people are satisfied with your products, the better your brand reputation. You can leverage a positive brand reputation by offering premium prices without fear of losing clients.
- Quality control also allows you to identify and mitigate potential liability risks and workplace hazards that could lead to avoidable legal suits and ethical penalties.
Phases of Quality Control in Plastic Manufacturing
- Mold and Product Design Inspection: This process involves reviewing the mold and product design blueprint to ascertain the project’s feasibility. To ensure precision and efficiency throughout the production cycle, review the QA checklist for quality markers to test for in the final product. Implement a method like the Advanced Product Quality Planning (APQP) method to set, measure, and improve your product designs and communicate changes to the designer and manufacturer.
- Material and Machine Inspection: The next step is to collect samples of raw materials to inspect for signs of metallic contamination and defects. An ideal way to inspect plastic pellets or granules is material testing. Conducting laboratory or online tests allows you to detect the moisture, hardness, heat resistance, tensile strength, chemical resistance, color variation, and size variation of the plastics. You should also conduct in-depth research to understand the price, availability, and assemblage of the raw materials. Ensure you perform routine maintenance tests on your molding machines before each production run.
- Process Control: Process control is a quality control measure that involves monitoring, evaluating, and controlling the plastic molding parameters—temperature, speed, pressure, time, and position—in a production cycle to ensure the final products meet the established QA standards. Some of the popular process control methods for plastic manufacturing include Statistical Process Control (SPC), Continuous Process Control (CPC), Multivariate Analysis (MA), and Computer Aided Quality (CAQ)
- Post-production Inspection: Before batch products are distributed and consumed, you should visually inspect the products to detect errors and flaws you may have missed during process control. Post-production quality control may include improving the packaging, transportation, and installation of final parts to prevent damage. It may also involve inspecting your compliance with industry regulations.
A Step-by-Step Guide to Integrating Quality Control in Your Plastic Production Process for Optimum Results
An ideal way to achieve optimum results in your plastic production is to outsource with a reliable and experienced polymer engineering and manufacturing firm with an efficient quality management framework. Nonetheless, you can create your framework from scratch and have your manufacturing team adopt it.
If you’re looking to improve the efficiency of your production cycle, boost customer satisfaction and retention, maximize your sales and profit margins, and impress your investors, these are the steps to get there.
1. Adopt a Quality Management (QM) Approach
Quality management is the responsibility of the product owner and business managers. It involves overseeing the strategies, techniques, tools, and people involved in optimizing quality in the organization. Quality management involves adopting an approach, before proceeding to creating a quality assurance plan, establishing quality control parameters, and creating avenues for quality improvement.
Some of the most notable approaches to QM for plastic manufacturing are Total Quality Management, Six Sigma, Kaizen, ISO, Zero Defect Programs, Quality Circle, and Taguchi Methods.
2. Create A Quality Assurance Plan
Based on your industry, the client specifications, and the project scope, create an assurance plan. A quality plan is a comprehensive proposal detailing the strategy, processes, tools, and skills needed to achieve the quality objectives established by management. This document explains how the quality management system works and how each function interrelates with one another.
Basic information in the document includes the organizational structure, roles and responsibilities, product design requirements, customer expectations, industry regulations, quality control phases, training, risk management, documentation, and audit.
3. Enforce Quality Control Measures
Once the QA proposal has been approved by management, the next step is to implement the quality control matures and methods from idea conception to final consumption. For plastic manufacturing, some of the quality control measures to integrate into your framework include quality inspection, testing, validation, and auditing.
Enforcing statistical quality control allows you to generate actionable data for future projects. Statistical quality control methods include acceptance sampling and statistical process control, which use control charts to quantify process parameters.
4. Develop Quality Control Training Programs for Workers
Quality control training allows you to provide avenues for them to upskill and reskill on the latest advancements and practices in plastic manufacturing quality assurance and quality control. Obtain professional certifications in QM, QA, and QC to boost credibility. Conduct training sessions for workers on executing the quality management framework.
Training should be regular and for all employees. It should cover areas such as how to apply quality control tools and techniques and how to communicate feedback from production and customers to top management. There should be periodic assessments to measure competence.
5. Enable a Multi-Channel Communication System
An open channel of communication encourages continuous improvement. There should be an open channel of communication between cross-functional teams: quality managers, manufacturers, product designers, material engineers, and process inspectors to optimize the quality of the final output and minimize hazards in the workplace.
Feedback from customers should be integrated into the process. Informal communication channels should be established as they can positively influence quality control decisions. According to Statista, the channels customers mostly use in contacting brands are email, web/app chat, and social media.
6. Evaluate Quality Control Performance
At the end of each production run, data should be extracted from the quality scorecard, traceability and recall reports, industry safety standards, and internal audits should be collated for further analysis. Data from informal communication channels, surveys, ratings, referrals, and reviews should also be collated and analyzed to identify areas for improvement.
Indicators of optimal quality control performance include low cost of materials, low cost of production, low cost of quality, low defect rate, high-quality yield, high user engagement, high purchase rate, low return rate, and zero industry violations.
7. Use Generated Data to Influence Future QM Decisions
The results from quality control efforts should be carefully documented using blockchain and cloud computing so they can be retraced and retrieved for future reference and continuous improvement. The quality control process has evolved over the years due to technological advancements. Today, quality control is one of the most popular use cases for artificial intelligence.
Artificial intelligence and machine learning algorithms have made it easier to use recurring trends and patterns to predict future opportunities and challenges to optimize the quality of plastic products. Based on the forecasts, management can increase or decrease the funding of incertain quality control activities to boost their return on investment.
Final Thoughts
As a plastic manufacturer, quality control protects your investment. It increases accountability in the injection molding process and your chances of achieving commercial success on your debut. At PTI Tech, we deliver the highest quality in every production stage and business relationship.
Certified in multiple International Standards Organization (ISO) standards, we ensure our clients can look forward to a quality control process that guarantees efficiency in inspecting, testing, validating, and auditing plastic materials, molds, and injection molding machine parts. Our quality management system accommodates regular quality control appraisals and continuous improvement of processes to ensure optimum results in every project.