Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Room Temp Vacuum Debulk

Room Temp Vacuum Debulk

Room Temp Vacuum Debulk

Want to get the forums input on the length of time to complete a vacuum debulk? Time for individual plies and a time if you only complete a final debulk? I am sure there is a time frame that there is no benefit to leave it under vacuum when doing a room temp debulk, no heat is applied. Working with silica and carbon phenolic prepreg approximately 8 plies

RE: Room Temp Vacuum Debulk

There really is no general answer to your question except that it depends on a lot of variables, like temperature, resin viscosity and what you want to accomplish. Sometimes debulk is used to minimize voids in the part, in which case a 24 hour debulk can be beneficial. With phenolic resins the main reason for bebulk is to prevent wrinkles due to compaction, in which case 10 or 20 minutes might be sufficient.

Develop a measurement that will tell you that you have accomplished what you want from the debulk process. If you don't know why you are debulking, perhaps you do not need to do it at all.

One common mistake done during debulking is to bridge bagging materials over the edges of parts. This will cause a compaction pressure intensification on the part edge which will pinch-off breathing paths, contrary to what a debulk is for.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close