Magnetic Box Closures

It’s very often today you will find Rare Earth Magnets utilised in producing retail packaging. That is generally paper box construction that has a number of movable flaps. Often found in top end kids book collections, DVD collections, or such things as Craft type kits found packaged in paperboard. It really is considered an upgraded to the hook and loop type fasteners (i.e. Velcro) found in older style boxes.

There are 2 configurations which needs to be considered.

1) Using two rare earth magnets

2) Using one rare earth magnet, then one bit of ferrous metal

Selecting which replacement for choose depends on a several factors:

Gap – what’s going to become the total distance relating to the magnet/metal pair
Feel – just how much force are you interested in the tip user to make use of when opening

Because of the somewhat fragile nature of rare earth magnets, it is usually recommended that in assembly of the box, that the a double edged sword (two magnets, magnet/metal) stop in a position to are available in direct experience of 1 another. This will minimize any chance the magnet could break as a result of shock once the box is closed.

Two Magnets – This configuration is most beneficial utilized each time a stronger bond is required, and when the content is thick, building a larger gap between the two. Magnets may be inserted into paper board that is die-cut, or they can also be surface mounted and laminated over (or perhaps a decorative design, sticker or pad of some kind might be placed on the magnet). Careful attention have to be made during assembly to ensure the polarity is an attracting configuration. Some manufactures offer rare earth magnets which might be marked around the North seeking pole to help in assembly. If magnets are improperly mounted in an opposing configuration, they will repel as well as the box will not likely close. Magnets like to attract to one another in an exceedingly exact manner, and so the two magnets will have to mate together close for your ideal bond to take place.

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Magnet & Steel – This configuration is the most suitable utilized whenever a slightly weaker bond is desired, the pad being employed is not as heavy, or when total cost would be the limiting factor. Using steel as the mating piece for the magnet cuts the overall cost substantially as steel is a reasonably bit less than the rare earth magnets. Steel discs, washers and also other similar steel can be used as the mating part towards the rare earth magnet. Another factor which makes the magnet-steel combination attractive could be the positioning of magnet. Alignment in the steel piece just isn’t as critical since the magnet will attract well towards the steel whether it is over-sized or not centered. Lastly there are no concerns with polarity aided by the magnet-metal configuration, because magnet attracts towards the steel equally on either its northern border or South seeking poles. Steel pieces are mounted from the similar ways since the magnets and box may very well be die-cut plus the metal inserted, maybe it’s taped in, glued in, and it could be laminated over for your totally invisible bond.

Equally for magnet-magnet and magnet-steel configurations the two main factors which use a stronger solution with the bond.

1) The diameter on the magnet. Larger diameter (larger surface areas) in the magnets will yield stronger the bonds.
2) The thickness with the magnet. Thinner magnets won’t have just as much holding strength as thicker magnets.

Just experiment. Try various configurations on your box construction. It may well are better with one larger pair, or two smaller pairs. In the event the bond is too strong, reduce the magnets diameter, number of magnet pairs, or the thickness on the magnets or steel.

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