It is very often today you may find Rare Earth Magnets utilised in making retail packaging. It is usually paper box construction which includes a number of movable flaps. Often noticed in high end kids book collections, DVD collections, or such things as Craft type kits found packaged in paperboard. It’s considered a replacement to your hook and loop type fasteners (i.e. Velcro) within older style boxes.
There are two configurations which needs to be considered.
1) Using two rare earth magnets
2) Using one rare earth magnet, and another part of ferrous metal
Selecting which solution to choose depends upon a several factors:
Gap – what’s going to function as the total distance between magnet/metal pair
Feel – just how much force would you like the tip user to apply when opening
Because of the somewhat fragile nature of rare earth magnets, it will always be recommended that during assembly from the box, the a double edged sword (two magnets, magnet/metal) not be permitted to are available in direct hitting the ground with each other. This can minimize any chance the magnet could break because of shock when the box is closed.
Two Magnets – This configuration is better utilized every time a stronger bond is needed, and when the pad is thick, developing a larger gap with shod and non-shod. Magnets could be inserted into paper board which has been die-cut, or they can also be surface mounted and laminated over (or even a decorative design, sticker or pad of some sort may very well be placed over the magnet). Consideration need to be made during assembly to guarantee the polarity is in an attracting configuration. Some manufactures offer rare earth magnets that are marked on the North seeking pole to assist in assembly. If magnets are improperly mounted in a opposing configuration, they’ll repel and also the box won’t close. Magnets want to attract together in a very exact manner, hence the two magnets must mate together close to the ideal bond to happen.
Magnet & Steel – This configuration is better utilized whenever a slightly weaker bond is desired, the information being used is not as heavy, or when overall cost is the limiting factor. Using steel since the mating piece to the magnet cuts the overall cost substantially as steel is a pretty bit less expensive 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 may be the placement of magnet. Alignment on the steel piece isn’t as critical as the magnet will attract well towards the steel if it’s over-sized or not centered. Lastly there isn’t any concerns with polarity aided by the magnet-metal configuration, because the magnet attracts to the steel equally on either its northern border or South seeking poles. Steel pieces are mounted in the similar ways as being the magnets and box might be die-cut plus the metal inserted, it might be taped in, glued in, and it could be laminated over for that totally invisible bond.
Either way magnet-magnet and magnet- Concrete Magnets there’s 2 factors which use a stronger solution on the bond.
1) The diameter with the magnet. Larger diameter (larger surface areas) on the magnets will yield stronger the bonds.
2) The thickness of the magnet. Thinner magnets won’t have as much holding strength as thicker magnets.
Just experiment. Try various configurations for ones box construction. It may are better with one larger pair, or two smaller pairs. If your bond is simply too strong, lower the magnets diameter, quantity of magnet pairs, or perhaps the thickness with the magnets or steel.
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