Magnetic Box Closures
It is very often today you are going to find Rare Earth Magnets utilised in the creation of retail packaging. This can be quite often paper box construction which has one or more movable flaps. Often seen in top quality kids book collections, DVD collections, or stuff like Craft type kits found packaged in paperboard. It is considered a substitute on the hook and loop type fasteners (i.e. Velcro) present in older style boxes.
There’s 2 configurations which should be considered.
1) Using two rare earth magnets
2) One rare earth magnet, and something piece of ferrous metal
Selecting which option to choose depends upon a several factors:
Gap – after that function as total distance between your magnet/metal pair
Feel – the amount of force do you need the finish user to make use of when opening
Due to the somewhat fragile nature of rare earth magnets, in most cases recommended that in assembly in the box, that the two parts (two magnets, magnet/metal) not permitted to are available in direct exposure to each other. This tends to minimize any chance the magnet could break as a result of shock once the box is closed.
Two Magnets – This configuration is advisable utilized whenever a stronger bond is required, and once the pad is thick, building a larger gap between the two. Magnets might be inserted into paper board which was die-cut, or they may also be surface mounted and laminated over (or perhaps a decorative design, sticker or pad of some sort or other might be placed within the magnet). Alert must be made during assembly so that the polarity is at an attracting configuration. Some manufactures offer rare earth magnets that happen to be marked for the North seeking pole to assistance with assembly. If magnets are improperly mounted in an opposing configuration, they’re going to repel and also the box will not likely close. Magnets prefer to attract to one another within a exact manner, and so the two magnets must mate together nearby with the ideal bond that occurs.
Magnet & Steel – This configuration is the most suitable utilized any time a slightly weaker bond is desired, the fabric used just isn’t heavy, or when Insert Magnet would be the limiting factor. Using steel because the mating piece for the magnet cuts the all inclusive costs substantially as steel is a pretty bit less than the rare earth magnets. Steel discs, washers as well as other similar steel bring the mating part to the rare earth magnet. Another factor that produces the magnet-steel combination attractive could be the placement of magnet. Alignment of the steel piece is not as critical as being the magnet will attract well for the steel whether it’s over-sized you aren’t centered. Lastly there won’t be any concerns with polarity with all the magnet-metal configuration, since the magnet attracts for the steel equally on either north of manchester or South seeking poles. Steel pieces are mounted in the similar ways because magnets and box may be die-cut and the metal inserted, maybe it’s taped in, glued in, also it may very well be laminated over for that totally invisible bond.
Either way magnet-magnet and magnet-steel configurations there’s 2 factors which increase the strength of the bond.
1) The diameter of the magnet. Larger diameter (larger surface areas) of the magnets will yield stronger the bonds.
2) The thickness with the magnet. Thinner magnets won’t have as much holding strength as thicker magnets.
Just experiment. Try various configurations for the box construction. It may work better with one larger pair, or two smaller pairs. Should the bond is way too strong, slow up the magnets diameter, volume of magnet pairs, or even the thickness from the magnets or steel.
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