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.

Die Hans Brunner GmbH hat vor vielen Jahren Formen mit Magneten in verschiedenen Bereichen eingeführt. Die Magnete garantieren den einwandfreien und absolut dichten Zusammenhalt zweier Formenhälften.
Sehr bekannt sind die im Thermopress-Verfahren hergestellten Schleuderformen für Hohlfiguren wie Osterhasen, Eier oder sonstige Saisonartikel. Viele aus dem Handel bekannte Hohlfiguren werden mit diesen Formen in großer Vielfalt und hoher Stückzahl hergestellt.
Darüber hinaus bestücken wir auch viele Spritzgussformen mit Magneten. Hier kommen Neodym-Magneten zum Einsatz, die sich bestens bewährt haben. Aktuell verbauen wir mehr als 2 Millionen Magneten pro Jahr. Bisher wurden diese in vorgefertigte Vertiefungen eingelegt und anschließend mit einem eigens dafür gefertigten Kunststoffteil ( „Deckel“ ) verschlossen. Mittels modernster Ultraschall-Anlagen werden diese „Deckel“ mit der Form verschweisst und die Magnete so eingeschlossen und fixiert.

Als zusätzliches Verfahren bieten wir seit einiger Zeit auch das „Vergiessen“ oder „sealing“ von Magneten in Formen an. Hier werden die Magnete in vorgefertigte Aussparungen in der Formenrückseite eingelegt und anschließend mit einer Spezial-Giessmasse versiegelt. Das Gießen und das anschließende Aushärten der Giessmasse geschieht unter aufwändig ermittelten und genau definierten Bedingungen. Der Magnet wird komplett versiegelt und somit vor dem Spülwasser des Reinigungsprozesses geschützt. Die Giessmasse bleibt dauerhaft leicht elastisch und schützt den Magnet vor den in Produktionsanlagen üblichen Vibrationen.

Es ist uns gelungen dieses Verfahren zu Automatisieren. Eine große Prozess-Stabilität war uns dabei sehr wichtig. Die ersten Formen mit dieser Vergusstechnik sind nun seit einigen Jahren im Einsatz und haben sich auch im industriellen Gebrauch bewährt.

Gerne prüfen wir bei Ihrem nächsten Formenprojekt, ob diese Alternative eingesetzt werden kann und Vorteile für Sie bietet.

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https://youtu.be/us42wK_fWlQ

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