It is extremely often today one will find Rare Earth Magnets utilized in the production of retail packaging. This can be most often paper box construction which includes a number of movable flaps. Often observed in top end kids book collections, DVD collections, or stuff like Craft type kits found packaged in paperboard. It’s considered a replacement to your hook and NdFeB Magnets (i.e. Velcro) found in older style boxes.
There are two configurations which needs to be considered.
1) Using two rare earth magnets
2) One rare earth magnet, and another piece of ferrous metal
Selecting which option to choose is dependent upon a several factors:
Gap – what will be the total distance involving the magnet/metal pair
Feel – just how much force are you wanting the final user to make use of when opening
Because of the somewhat fragile nature of rare earth magnets, it’s usually recommended that in assembly on the box, how the two parts (two magnets, magnet/metal) not permitted to come in direct connection with each other. This tends to minimize any chance the magnet could break due to shock if the box is closed.
Two Magnets – This configuration is the most suitable utilized every time a stronger bond is needed, and once the content is thick, setting up a larger gap with shod and non-shod. Magnets is usually inserted into paper board which has been die-cut, or including be surface mounted and laminated over (or a decorative design, sticker or pad of some sort or other could possibly be placed on the magnet). Attention need to be made during assembly so that the polarity is an attracting configuration. Some manufactures offer rare earth magnets which can be marked for the North seeking pole to help with assembly. If magnets are improperly mounted within an opposing configuration, they are going to repel and also the box won’t close. Magnets wish to attract together in an exceedingly exact manner, hence the two magnets must mate together nearby for the ideal bond to take place.
Magnet & Steel – This configuration is advisable utilized whenever a slightly weaker bond is desired, the pad being used just isn’t heavy, or when overall cost may be the limiting factor. Using steel as the mating piece to your magnet cuts the total cost substantially as steel is a reasonably bit less expensive than the rare earth magnets. Steel discs, washers and other similar steel bring the mating part to the rare earth magnet. Take into consideration that makes the magnet-steel combination attractive is the keeping magnet. Alignment of the steel piece is not as critical since the magnet will attract well for the steel whether it is over-sized or otherwise not centered. Lastly there isn’t any concerns with polarity when using the magnet-metal configuration, as the magnet attracts for the steel equally on either the North or South seeking poles. Steel pieces are mounted inside the similar ways because magnets and box may be die-cut and also the metal inserted, it might be taped in, glued in, and it could possibly be laminated over for your totally invisible bond.
Equally for magnet-magnet and magnet-steel configurations there are 2 factors which increase the strength of the bond.
1) The diameter from the magnet. Larger diameter (larger surface areas) in the magnets will yield stronger the bonds.
2) The thickness from the magnet. Thinner magnets will not have the maximum amount of holding strength as thicker magnets.
Just experiment. Try various configurations on your box construction. It may well are more effective with one larger pair, or two smaller pairs. If the bond is just too big strong, reduce the magnets diameter, volume of magnet pairs, or maybe the thickness from the magnets or steel.
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