Polyoxymethylene (POM) is a semi-crystalline thermoplastic that is known for its high strength, rigidity, and low friction properties. It is commonly used in the production of gears, bearings, and other mechanical parts that require these characteristics. POM is also known by the trade name “Acetal” and is chemically resistant and has a low coefficient of friction, making it suitable for use in a wide range of applications.
POM injection molding process is commonly used in the production of parts for the automotive, electronic, and consumer goods industries. It is also used in the production of medical devices and in the construction of aircraft and other transportation vehicles.
POM has several advantages over other polymers. It has a high strength-to-weight ratio, making it suitable for use in lightweight parts. It also has a low coefficient of friction, which makes it suitable for use in bearing and gear applications. POM also has good dimensional stability, which means that it maintains its dimensions over time and has a low shrinkage rate.
There are two main types of POM: homopolymer acetal and copolymer acetal. Homopolymer acetal has a higher tensile strength and is more resistant to wear, making it suitable for use in applications that require these properties. Copolymer acetal, on the other hand, has a lower melting point and is more resistant to moisture absorption, making it suitable for use in applications where these properties are important.
In POM injection molding process, POM is melted and injected under high pressure into a mold cavity, where it cools and solidifies to form a part with precise dimensions and detailed features. The process begins by heating the POM resin to a molten state, after which it is injected into a mold tool that consists of two halves: a stationary half and a moving half. The mold cavity is formed by the space between the two halves of the mold tool, and the shape of the final part is determined by the shape of the mold cavity.
One of the key considerations in the design of POM injection molded parts is the inclusion of draft angles. These are slight tapers that are included on the sides of the part to allow for easier removal from the mold. Without these draft angles, the part may become stuck in the mold and be difficult to remove. It is important to include draft angles that are sufficient to allow for easy removal, but not so large that they compromise the strength or functionality of the part.
The condition of the mold is also important for the production of high-quality POM injection molded parts. Molds that are worn or damaged can result in parts with poor surface finish or dimensional accuracy. It is important to regularly maintain and repair molds to ensure that they are in good condition.
Finally, the processing conditions, such as the temperature and pressure of the injection process, can also affect the quality of POM injection molded parts. It is important to carefully control these parameters to ensure that the parts have the desired properties.
POM injection molding is a versatile and efficient process for the production of high-strength, precise plastic parts. By considering the design of the part, the condition of the mold, and the processing conditions, it is possible to produce high-quality POM injection molded parts that meet the desired specifications.
Additionally. POM has low melting point, good flow characteristics, and a high resistance to wear and abrasion. It also has a low coefficient of friction, which makes it suitable for applications that require low-friction sliding or rotating surfaces.
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