Results 1 to 4 of 4

Thread: PMMI injection issues

  1. 8th April 2015, 06:48 PM #1
    moldptc
    moldptc is offline Junior Member
    Join Date
    Apr 2015
    Location
    Michigan
    Posts
    8

    PMMI injection issues

    Hello,

    has anyone have experience in molding parts with PMMI and what are some of the issues you may have had. Trying to learn and trouble shoot this resin. Thanks
    Reply With Quote Reply With Quote
  2. 8th April 2015, 07:08 PM #2
    rickbatey's Avatar
    rickbatey
    rickbatey is offline Senior Member
    Join Date
    Aug 2011
    Location
    Upstate of South Carolina
    Posts
    701

    Re: PMMI injection issues

    I've ran clear parts that we milky inside until the parts finished cooling internally. The resin likes a warm mold, not too much shear, and a good pack/hold to get best results.
    Rick.
    Reply With Quote Reply With Quote
  3. 8th April 2015, 07:15 PM #3
    moldptc
    moldptc is offline Junior Member
    Join Date
    Apr 2015
    Location
    Michigan
    Posts
    8

    Re: PMMI injection issues

    yeah we have to run the mold at 230F and the shot is at 511F. it degrades super fast, has a lot of stability issues, for optics reasons we have to use it but this resin is a pain in the butt
    Reply With Quote Reply With Quote
  4. 9th April 2015, 03:35 AM #4
    rickbatey's Avatar
    rickbatey
    rickbatey is offline Senior Member
    Join Date
    Aug 2011
    Location
    Upstate of South Carolina
    Posts
    701

    Re: PMMI injection issues

    Well I think PC is even harder to mold. High screw rpm or excessive back psi can over heat/shear the resin. Watch the screw psi as well to know if your heats/residence times are working well.
    Rick
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Posting Permissions

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

Forum Rules