You might want to sort of the seeds, as they are useless and takes up solvent, you could use a kitchen sift/sieve to sort the material, make sure to use your hands as little as possible and dont press it together, work it loosely.

other wise if you shake a bag continuously, the seeds will layer at the bottom or near depending on how crumbled the weed is.

If there is a lot put it in a big bag, close and beat with stick.

You need to get rid of the seeds, they contain the legal hempseeds oil, which you probably dont want spoiling your extract.