POM, or Polyoxymethylene, is a high-performance engineering plastic known for its excellent mechanical properties, such as high stiffness, low friction, and good dimensional stability. As a leading POM plastic part supplier, I am often asked about the production process of POM plastic parts. In this blog post, I will take you through the entire journey of creating POM plastic parts, from raw material selection to the final product.
Raw Material Selection
The first step in the production of POM plastic parts is the careful selection of raw materials. POM is available in different grades, each with its own set of properties and characteristics. These grades can vary in terms of molecular weight, melt flow rate, and additives. For instance, some grades are formulated for enhanced wear resistance, while others are designed for better chemical resistance.
As a supplier, we work closely with our customers to understand their specific requirements. Based on factors like the intended application, environmental conditions, and mechanical performance needs, we select the most suitable POM grade. This ensures that the final product meets or exceeds the customer's expectations.
Pre - processing of Raw Materials
Once the appropriate POM grade is selected, the raw material undergoes pre - processing. POM is hygroscopic, which means it can absorb moisture from the surrounding environment. Moisture in the plastic can cause defects such as voids, bubbles, and poor surface finish in the final part.
To prevent these issues, the POM pellets are dried in a dehumidifying dryer. The drying process typically takes several hours at a specific temperature, usually around 80 - 100°C. This ensures that the moisture content is reduced to an acceptable level, typically below 0.02%.
Plastic Injection Molding
Plastic injection molding is the most common method for producing POM plastic parts. It is a highly efficient and cost - effective process that allows for the mass production of complex shapes with high precision.
Mold Design and Manufacturing
The first step in injection molding is the design and manufacturing of the mold. The mold is a critical component as it determines the shape, size, and surface finish of the final part. Our team of experienced engineers uses advanced CAD/CAM software to design the mold. The design takes into account factors such as part geometry, draft angles, gate location, and cooling channels.
Once the design is finalized, the mold is manufactured using high - quality tool steel. Precision machining techniques, such as CNC milling and EDM (Electrical Discharge Machining), are used to ensure the accuracy and quality of the mold.
Injection Molding Process
The dried POM pellets are fed into the hopper of the injection molding machine. The pellets are then conveyed through a heated barrel, where they are melted by the combination of heat and mechanical shear. The molten POM is then injected into the mold cavity under high pressure.
The injection pressure and speed are carefully controlled to ensure that the molten plastic fills the entire mold cavity evenly. Once the mold is filled, the plastic is allowed to cool and solidify. The cooling time is crucial as it affects the part's dimensional stability and mechanical properties. After the plastic has solidified, the mold opens, and the part is ejected.
If you are interested in our Plastic Injection Molding Services, please feel free to contact us for more details.
Post - processing
After the part is ejected from the mold, it may require some post - processing operations.
Deflashing
Deflashing is the process of removing any excess plastic, known as flash, that has formed around the edges of the part during the injection molding process. This is typically done using hand tools or automated trimming machines.
Machining
In some cases, additional machining operations may be required to achieve the desired dimensions and surface finish. Operations such as drilling, milling, and turning can be performed on the POM plastic parts. However, POM is a relatively hard and brittle material, so special cutting tools and machining parameters need to be used to avoid cracking or chipping.
Surface Treatment
Surface treatment can be applied to improve the appearance and performance of the POM plastic parts. This can include processes such as polishing, painting, or coating. For example, a UV - resistant coating can be applied to parts that will be exposed to sunlight for extended periods.
Quality Control
Quality control is an integral part of the production process of POM plastic parts. At every stage, from raw material inspection to the final product, strict quality control measures are implemented.
In - process Inspection
During the injection molding process, in - process inspection is carried out to monitor the quality of the parts. This includes checking the dimensions, weight, and appearance of the parts. Any parts that do not meet the specified requirements are immediately rejected.
Final Inspection
Once all the post - processing operations are completed, the parts undergo a final inspection. This includes a comprehensive check of the part's dimensions, mechanical properties, and surface finish. Advanced inspection equipment, such as coordinate measuring machines (CMM) and optical inspection systems, are used to ensure the accuracy and quality of the parts.
Applications of POM Plastic Parts
POM plastic parts are widely used in various industries due to their excellent properties.
Automotive Industry
In the automotive industry, POM plastic parts are used in applications such as fuel system components, gear wheels, and door lock mechanisms. Their low friction and high wear resistance make them ideal for these applications.
Electronics Industry
POM plastic parts are also used in the electronics industry, for example, in connectors, switches, and keyboard keys. Their dimensional stability and good electrical insulation properties are highly valued in this industry.
Industrial Machinery
In industrial machinery, POM plastic parts are used in conveyor systems, bearings, and bushings. Their high stiffness and low friction help to improve the efficiency and reliability of the machinery.
If you are looking for high - quality POM Plastic Machine Parts, we are your reliable partner. We also offer UV Stabilized ABS Cable Carrier Spacer Block for specific applications.
Conclusion
The production process of POM plastic parts involves a series of carefully controlled steps, from raw material selection to final inspection. As a POM plastic part supplier, we are committed to providing our customers with high - quality products that meet their specific requirements.
If you are interested in purchasing POM plastic parts for your project, we invite you to contact us for a detailed discussion. Our team of experts will work closely with you to understand your needs and provide you with the best solutions.
References
- "Plastics Engineering Handbook of the Society of Plastics Engineers"
- "Injection Molding Handbook" by O. Olajide