×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Long Fiber reinforced materials

Long Fiber reinforced materials

Long Fiber reinforced materials

(OP)
I curently have an ABS that is not performing well strength wise, and I am considering going to either a long fiber abs or even a long fiber polyester.  The original material I used in this aplication was 33%GFN, and the warpage of this curved plastic part was unbearable.

I was told that the long fiber materials will not warp and shrinkage rates are very low.  

Any thoughts?

Thanks

RE: Long Fiber reinforced materials

We can offer another alternative yet. We have a new process that may assist. If interested, please let me know.

Thanks,

Joe Miller

RE: Long Fiber reinforced materials

The addition of fiber will increase the stiffness of your part, however be careful with the orientation of long fibres and the loading of the part.

Shrinkage will also occur in 2 axis but at different %.

It all depends on your product / process and design

RE: Long Fiber reinforced materials

Long fiber reinforced thermoplastics (LFTP) have more, not less, potential for warpage because the long fibers are much more prone to flow induced orientation.

Shrinkage is primarily a function of process temperatures and fiber volume fraction, there is nothing inherently better about LFTP.

LFTP can have much higher strengths.

How large is your part? How much strength is needed?

RE: Long Fiber reinforced materials

Is the warpage due to molding or to exposure to elevated temps?  You may wnat to look at using an amorphous material rather than crystaline.

We produce polymers that will be able to help.

Regards

RE: Long Fiber reinforced materials

You'll have to look at the original performance requirements and see why 33% GF nylon product was chosen. Glas reinforced crystalline plastcs do tend to warp if designed improperly. It could be a molding or gating problem is to blame.

Check the overall performance of 33% GF nylon vs long strand ABS (not exactly the most common plastic in use these days). You need to know the end use conditions the part will be exposed to. The ABS should warp less, but with the addition of the long fibers its anyone's guess how much it will warp. It depends an the part geometry, wall thickness, gating and molding.

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


Resources

White Paper - PLM and ERP: Their Respective Roles in Modern Manufacturing
Leading manufacturers are aligning their people, processes, and tools from initial product ideation through to field service. They do so by providing access to product and enterprise data in the context of each person’s domain expertise. However, it can be complicated and costly to unite engineering with the factory and supply chain. Download Now

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