I've never watched this process so I can't say first-hand, but someone in the education department where I worked several years ago told me they separated large quantities of juice from the pulp by freezing the fruit and then piling it in a colander lined with paper towels, over a bowl, to thaw. I don't know whether they sliced the fruit before freezing it, but I think that would help. As it was explained to me, freezing ruptures the cell walls, and as the fruit thaws, the juice runs out and leaves the spines/glochids behind, trapped by the paper towels.