About Plastic Integrated Magnet, Plastic coated magnets, ABS plastic covered magnets
Magnets can be combined with different types of functional material to form specific magnetic assemblies such as pot magnet. For plastic integrated magnet, multiple components can be integrated through the injection molding process even each component has its own property. Magnet embedded in the plastic could be undamaged under external impact, also be given excellent dimensional accuracy and superior cost advantage in the production of high quantity complex assemblies, thus capture customers from civilian use to automotive applications.
Manufacturing Process of Plastic Integrated Magnet
Plastic integrated magnet can be implemented by insert molding, over molding, ultrasonic welding and some other options, and concrete process is determined by the relevant technical specifications.
For insert molding process, magnets are embedded into the plastic part. Unmagnetized permanent magnet is inserted into the cavity of the mold before injection molding which allows the molten plastic material to flow around the magnet. Besides the pretty high molding temperature, molten plastic is also injected at high pressure, thus require magnets must be held without movement during the injection molding process. Actually, there are two solutions for holding the magnet: pinch retainer type and pin retainer type.
MPCO MAGNETICS has collected many experience insert molding type plastic integrated magnet.
Over molding is the most conventional method to obtain fully encapsulated magnets and thus ensure magnets can be exposed under the harsh environment. The over molding technology involves two separate moulds and utilize one of moulds to make plastic part with cavity to place the magnet. Insert magnet into first plastic part, then place semi-finished assembly into another mould, thus molten plastic cover the magnet to form the second plastic part and fusing with the first plastic part in the meanwhile. Actually, you can find obvious weld line in this kind of plastic integrated magnet.
Ultrasonic welding is another technology to fully encapsulate the magnet which two pieces of plastic part assemble with magnet and fuse together by high-frequency vibration generated by ultrasonic welding machine.
Other options include button type, screw type and melt rivet type.
Magnets are assembled into plastics in for different uses. We call it plastics integrated magnets. Usually, magnets are utilized within plastics in order to be used as mechanical connector. Magnets can be implemented to plastics by inserting them to slots. Sometimes we use gluing. Sometimes plastic covered magnetic coupling magnets are placed in the plastic mold before the molding process. Of course, you should avoid to use magnets that cannot withstand the molding temperature. Simply look at the magnets maximum working temperature. It should be more than the temperature used for molding. You have to avoid loss of magnetic properties. Usually it can happen only with neodymium magnets.
There are many benefits of in combining magnets with plastics. Magnets that are placed within the plastic correctly could be undamaged by impact for example. The whole assembly, when designed correctly is easy to plastic device with magnet use or assembled.
MPCO can supply your company with the whole solution. Plastics integrated magnets are the kind of magnetic assembly that could beneficial to some companies. It could save time and money. MPCO can supply most types of plastics, shapes and sizes. Please contact us for more information.