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anyone knows how to build a heat seal lidding machine for sealing plastic container and lidding film?.. Answered

It has been quite some time I have been searching around in the internet, web pages, articles, instructables, make magazine or any other DIY thread and forums for a guideline or instruction on how can we built ourselves a heat seal lidding machine which can be used to seal a lidding film to a plastic container which is widely used by the food packaging company. There are a lot automated and sophisticated commercial machine being manufactured by many companies which priced at 10, 20, and even hundreds of thousands dollars. Even for a simple small mini hand operated machine cost up to 1,000 dollars..

I believe I am not the only one who are searching an instruction to DIY this machine, at least for own usage at home for small quantity operation. It is great if there are someone who brilliant, an inventor who can guide us in building this kind of machine. So far that i search, i found out that the closest article about heat seal is an instructable article "how to make a heat sealer" by klee27x. Hope that there is someone out there who can gave us light, either theoratically or a real deal about it.



9 years ago

Depending on the type of packaging it is either conductive (a hot press) or inductive (metal film is heated by magnetic fields) -- both accomplish the same thing, melt the plastic lid to the plastic(y) packaging.

Thermal is easiest, you just need a heated die that stamps the plastic down. Bonus points for having a sharper edge that applies more pressure at the edge, cutting it, where it applies less on the sealing area and ...just melting it.

The inductive machines are crazy. You put the foil/plastic cover over the opening, screw on a lid to hold it in place, then move the top under an inductive heater (there are LOTS of designs on the interwebs). They involve sending high khz frequency high amperage current through a coil to literally piss off the metal in the lid enough to make it hot enough to melt the sealing portion of the lid.

Keep in mind the process is really really patented, so you might have problems using it commercially without royalties.