Results 1 to 4 of 4

Thread: How Can I Prevent Molding Stress on Polycarb

  1. #1
    Join Date
    Jan 2018
    Posts
    3

    How Can I Prevent Molding Stress on Polycarb

    Greeting fellow professionals. I was wondering if you could share some ideas on some process techniques that can be used to effectively reduce molded in stress on PC parts. How can one effectively ameliorate molded in stress that could take away from PC's impact resistance?

    Thank You All

  2. #2
    Join Date
    Aug 2014
    Location
    Saint Paul, MN
    Posts
    139

    Re: How Can I Prevent Molding Stress on Polycarb

    Make the gates bigger
    Make the gates even bigger yet
    Slow the injection speed
    Anneal the parts after molding
    Round off any sharp corners in the mold cavity
    Raise the mold temperature

  3. #3
    Join Date
    Jan 2018
    Posts
    3

    Re: How Can I Prevent Molding Stress on Polycarb

    Thank you for the suggestions, Jaydub

  4. #4
    Join Date
    Aug 2011
    Location
    Upstate of South Carolina
    Posts
    597

    Re: How Can I Prevent Molding Stress on Polycarb

    Proper mold and melt temperatures will help but you may have to profile the hold pressure portion to reduce molded in stress. Running the correct resin with additives and melt flow will make life easier. The correct size screw size utilizing an appropriate amount of shot capacity will help. A proper compression ratio helps too. Lastly don’t run resins with UV or FR additives if possible. They can bloom causing cosmetic issues and degrade with high temperatures or residence times.
    Rick.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •