TM 1-1500-204-23-11
(if required) and all necessary vacuum bag
the patch must be started within 10 minutes
materials prior to mixing resin.
after completion of the double-vacuum debulk
process. Preparation of contoured surfaces
NOTE
for curing patch on tool or on aircraft must be
completed prior to completion of DVD process
Mixing resin and cloth impregnation should be
per this procedure.
done in a controlled environment per Chapter
During this procedure, refer to igure 3-6 for
Double Vacuum Bag Debulking Tool Schematic
If a heat survey is required, perform according
and igure 3-7 for Rigid Box Coniguration.
to paragraph 6-18g before beginning this
process.
(a) Using table 7-6 and/or 6-17, calculate
When a wet layup patch is to be formed
the amount of resin required to impreg-
to a contoured shape, inal processing of
nate the fabric.
DVD Parameters
Bleeder Plies
Resin
Resin Ratio
Debulk
Cloth
Compaction
Cure
(1)
Grams
Temp Time
Temp Time
Ramp Temp
Adhesive/ sq
Vacuum
Vacuum
Time Vacuum
ft Fabric
Carbon Fiber,
3 to 5 F/min
120 1 bleeder
8 Harness
110 to 120 F
110 to 120 F15
245 (15) F
EA9390
25 to 29
for every
Satin 3k Tows
60 to 65 minutes
to 20 minutes
150 minutes
2 plies of
Areal Weight
≥20 in Hg
≥20 in Hg
≥20 in Hg
laminate
373 g/m2
Carbon Fiber
125 (5) F 60
125 (5) F 30
3 F/min 215
120 1 bleeder
Plain Weave
min ≤ 16 plies 90
min ≤16 plies
(+10/-15) F
EA9390
21 to 23
for every
3k Tows
min > 16 plies
60 min > 16
120 minutes
4 plies of
Areal Weight
≥20 in Hg
plies ≥20 in Hg
≥25 in Hg
laminate
193 g/m2
110 to 120
3 to 5 F/min
120 1 bleeder
110 to 120 F
F 15 to 20
245 (15) F
EA9390
18 to 20
for every
60 to 65 minutes
7781
minutes ≥20
150 minutes
2 plies of
≥20 in Hg
in Hg
≥20 in Hg
laminate
NOTE
1.
Do not round up. For example, if the bleeder ply schedule is one bleeder for every four plies of
laminate, a seven ply laminate would get one bleeder, an eight ply laminate would get two bleeders.
2.
Refer to the system speciic technical manual for DVD processing parameters. If no processing
parameters are provided use this table.
(b) Mix the required amount of resin using
Do not apply a thin layer of adhesive
the mix ratio speciied in the system
onto the vacuum bag ilm taped to the
speciic technical manual or by the resin
lat surface.
manufacturer.
(d) Using the ply templates, mark and cut
(c) Impregnate repair plies per table 7-6
the individual plies without disturbing
and paragraph 6-16. Using a squeegee,
the vacuum bagging ilm or the repair
thoroughly wet-out the fabric taking care
ply per paragraph 6-16.
not to force resin from the fabric edges.