Unless there is more context to the quote, where
areas has already been introduced as a specific way of referring to a specific part of the machine, this is simply the wrong word. There is no common context where
area can be equated with the result of breaking down a
Alternative words to describe this stage in the process (although the context would also need to be changed) might be:
crumb - This is understood to be a fragment (but probably there is a better 'specialist' term amongst clay working)
fragment - other generic words describing something which is broken down
bar - describing the shape as in some way regular.
Then the lumps of clay are placed on a metal grid in order to break up the big chunks of clay into much smaller elongated bars, which are forced through the metal grid onto a roller, whose motion further segregates the bits of clay.
You could write this, or infer this meaning from the original test
Then the lumps of clay are placed on a vibrating metal grid. This breaks up the clay and only allows small chunks to pass through. A vibrating belt transports the clay and further breaks down the chunks to smaller parts.
This is more a accurate description of the process as I imagine it.