How does sonically sealed work?

nwcs

I've seen the term, but am interested in the actual process itself. Can anyone describe it to me? Is it a bunch of people yelling at a slab till it clams up to avoid the abuse?

cointagious

the principal is directed sound waves that weld the plastic. the sound accelerates the molecules causing heat to a point of melting the the material.

RLinn

<< <i>directed sound waves causing heat to a point of melting the the material. >>

Is this anything like when my wife is trying to win an argument with me?

nwcs

Interesting, now I understand it better. Seems like that could cause some damage to the ol' coins if misdirected just a tad...

cointagious

jewelers use of sonic cleaners is common. there are also home versions. yes, it can be used to clean coins...with practice!

HuliganRS

I though it was done by the staff of an NBA team... Seattle Supersonics?

Things hat make you go Hmmm..

Steve27

The process is analygous to the way microwaves heat water.

gemseeker

If the plastic material is melted around the coin, then why is it not airtight? Is it because the plastic has been made porous due to the molecular expansion of the chemical bonds? ACG said it uses individual dies, does that mean ACG slabs are not sonically sealed?

benloe

In my line of work I have had some expierence using ultra sonic welders. The units I am familiar
with actually cause the two parts being welded to vibrate together which causes heat that melts the
plastic. The pressure is applied to the top and the bottom and the mechanical vibration (usually
at 20,000 cycles per second) does the rest

robertpr

<< <i> If the plastic material is melted around the coin, then why is it not airtight? Is it because the plastic has been made porous due to the molecular expansion of the chemical bonds? ACG said it uses individual dies, does that mean ACG slabs are not sonically sealed? >>



My understanding is that generally, they are airtight. However they aren't guaranteeing that they didn't miss a spot, so they just say they're not airtight.

Conder101

When the slabs are sealed pressure is place around the outer edge of the slab by the welding machine and the weld takes place around the edge, not the entire surface of the slab.

When ACG says the use individual dies, what they mean is that they have a slab shell specific to each size of coin. They do not use the soft plastic rings around the coins and then but them all in a single size holder.