Sealing Compound

Years ago, the company Hans Brunner GmbH has introduced moulds with magnets in different sectors. Together with other parts which have been produced for this process - the magnets ensure that two mould halves hold together perfectly and tightly. Our spinning moulds for hollow figurines like rabbits, eggs or other season articles are very popular because of that.

A lot of famous chocolate hollow figurines are produced with these moulds in various designs and in high quantities. In addition to that, we equip a lot of injection moulds with magnets. We are using neodymium magnets which already proved themselves as very efficient. Currently, we are using more than 2 million magnets per year. Until now, they have been put into prefabricated notches which have been closed with a special plastic part (“lid”). With most modern ultrasonic-equipments, these lids will be welded with the mould so that the magnets are fixed.

For some time, we have been additionally offering to “seal” the magnets. Here, the magnets are going to be put into prefabricated notches which you can find on the back side of the mould, and then we seal them with a special sealing compound. The sealing compound will be cast and harden under strict requirements which have been previously determined and defined. The magnet is completely sealed and so that no rinsing water will get in touch with it during the washing process. The sealing compound is permanently slightly elastic and protects the magnet from common vibrations in production machines. We managed to automate this process. It was also important for us to guarantee process stability. The first moulds made with this sealing technique are now used since several years and got perfect results in the industrial use. We would be happy to verify if this alternative can be used for your next mould project and if you can benefit with this technique.

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