TM 1-1500-204-23-11
containing the wet layup laminate and heat blanket.
vacuum bag to the atmosphere so that only the inner
The outer vacuum bag is placed over the box and
vacuum is applied to the repair patch. Following
vacuum applied. This second vacuum bag and rigid
debulking and compaction, the laminate is removed
box relieve the compaction pressure on the laminate
from the debulking tool and formed to a tool or part
induced by the initial vacuum bag, while maintaining
surface. A vacuum bag is then applied over the
vacuum on the inner bag. With vacuum applied to both
laminate (and heat blanket if applicable) and vacuum
bags, the laminate is heated to the debulk temperature
applied. Heat is then applied to cure the laminate
and held for a speciied time. This allows trapped
using an oven or heat blanket. Chapter 7 details the
gases to be removed without being trapped by the
DVD procedures. Appendix B lists the NSN for the
compressing (inner) vacuum bag. Next, compaction
DVD tool.
of the laminate is accomplished by venting the outer
Figure 3-6. Double Vacuum Debulk (DVD Tool Schematic)