×
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

Jobs

Overmolding TPU or TPE onto PP or Nylon HELP

Overmolding TPU or TPE onto PP or Nylon HELP

Overmolding TPU or TPE onto PP or Nylon HELP

(OP)
Hi,
We have a base shell that is currently made of PP, and we anticipated using TPE for the overmold drink retainer flaps, however in testing the TPE has way too much surface friction, which causes the flap to stick to the drink container and invert as the container is removed.

Thus, we tried overmolding TPU(which seems to have lower surface friction) to the PP with poor results.

Thus, can you guys suggest some material combinations that may work? We need the retainer flap to have low surface friction and be overmoldable onto the shell. Thus, my thought is to try a Nylon6 shell with TPU retainer flap overmolds - thoughts?

other ideas?

Thanks,
Mark

RE: Overmolding TPU or TPE onto PP or Nylon HELP

Add some ultrahigh molecular weight silicone as a drop-in solution to reduce friction. UHMW silicones are preferred because they do not migrate which is a major problem for regular silicones. Suppliers are Excista.com, Dow Corning and Wacker.

Chris DeArmitt - PhD FRSC

Plastics & Materials Consulting
www.phantomplastics.com

Plastic Training Seminars
www.plastictraining.com

RE: Overmolding TPU or TPE onto PP or Nylon HELP

(OP)
Do you have a recommendation regarding how much UHMW silicone to add, and which brand might work best in our injection molded TPE setup?

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 – Choosing the Right Spring Loaded Connector
In today’s cost-sensitive world, designers are often driven to specify the lowest cost solution for every aspect of their designs to ensure that their solution is competitively priced and their company remains profitable. However, specifying a low-cost, low-quality connector solution can result in premature failure, considerable re-work costs and damage to reputations. Download Now
eBook – Own the Lifecycle: Sustainable Business Transformation
Increasingly, product and services companies are seeking more information and control in the operational lifecycle of their products, including service and use. Better information about the operational lifecycle, and the ability to use that information, requires more than just unstructured data flowing back from products in the field. 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