What is EMI Shielding: Secondary Plastic Molding

Progress is defined as forward movement through space and time. Progress is an inevitability. Advancements for electronics are increasingly exponentially. Because of this, manufacturers must adapt to these advancements. Likewise, the increasing advances in electronics cause more Electromagnetic Energy/Current. As a result, a demand for more products that are Electromagnetic Interference (EMI) Shielded is on the rise. Therefore, many different technological parts in the automotive, transportation, medical, and personal/commercial electronics industries now require EMI shielding.

What is EMI Shielding?

Firstly, let us introducing you to the concept of EMI Shielding: the prevention of Electromagnetic Interference. By definition, EMI Shielding is a mechanism used to prevent electromagnetic interference. Plastic injection molding projects often include housing for electronics, electronic medical devices, automotive, aviation, and other parts that experience contact with high voltage, or sensitive electronics. Sensitive electronics and high voltage require protection against electromagnetic interference. Explained simply: there is a need for a barrier that blocks or disrupts the interference that can occur.

copper/silver plated EMI shielding sprayed onto plastic part

How Does EMI Shielding Work?

EMI shielding is a secondary “decorative” process that occurs after the mold has cooled. Then, the manufacturer can apply a metallic coating to the plastic part. As an example, it can line the inside of electronic housing for a sensitive medical sensor. Thus, the EMI shielding/lining is frequently made with conductive or magnetic materials. Copper is a popular choice for metallic coating. This is because Copper protects against both magnetic and radio frequencies. Consequently, the metallic barrier absorbs or reflects the electromagnetic energy.

Uses of EMI Shielding

Moreover, It is very likely you have already visibly seen, and benefited from, the use of electromagnetic interference technologies today. You might think this is obvious. Your personal electronic devices are all complete with EMI prevention technologies. That’s right! We said, “visibly seen.” An everyday example we like to refer to is in your kitchen. Have you guessed it yet? Take a look at the film lining on the door of your microwave. This mesh lining isn’t just to make cooking your popcorn more mysterious. This electromagnetic interference prevention technique has many options 1 – but the “need to know” piece of information is that almost all of the options include metal coating or plating along with the use of plastic.

Secondary Plastic Injection Molding Techniques

EMI shielding has become a very popular secondary decoration technique for many of our plastic injection molding projects. At Nylacarb, we have many clients that need to make use of this technology for their electronic device, medical devices, and automotive devices. If you have an injection molding project you think requires the use of EMI shielding, reach out to us. We will be happy to get you in touch with our engineer so you can discuss more about the specifics of your project and what we can provide you with to optimize the production, functionality, and quality of your product.

1 https://emfadvice.com/emf-shielding-materials-fabrics/

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