heat pressure cycle for debulking the radius filler fig1 19 illustrate the debulking sequence in greater detail as shown in fig1 the operation is relatively simple vacuum bag the plies on a mandrel using an fep release film to protect against sticking the radius filler to the mandrel then in an autoclave or other suitable pressure vessel expose the u201c green u201d radius filler to 85 psi pressure at 200 u00b0 f for 60 minutes with 5 u00b0 f min heat up and cool down temperature ramps this cycle is used to debulk the sections 32 or 34 or the entire radius filler 38 prior to ultrasonic cutting we lay up the plies in accordance with bps 5ptplb01 c hot debulk per pts 98 pts 001 rev a and ultrasonically trim using a gfm us 50 cutter we place one ply of porous fep fluorinated ethylene propylene film between the u201c green u201d radius filler and the lay up mandrel table the cutter uses a gfm uk 72 cl 0 knife carried on a sonotrobe horn at 5000 mm min about 550 in min with 30 40 amplitude and a 30 u00b0 lead angle to make the multistacked laminated radius.