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Thread: Line mark on the surface of product

  1. #1
    Join Date
    May 2018
    Posts
    16

    Line mark on the surface of product

    We have tried to get rid of this line mark on the surface of product but we couldn't we have tried with injection speed but no change.
    what do you think?
    material: PP
    thickness: 4,5 mm
    cold runner 2 gates

    thanks in advance
    Attached Thumbnails Attached Thumbnails 1.jpg   2.jpg  

  2. #2
    Join Date
    Nov 2012
    Posts
    158

    Re: Line mark on the surface of product

    could you please insert a picture of whole part and mark a injection gates location?

  3. #3
    Join Date
    May 2018
    Posts
    16

    Re: Line mark on the surface of product

    Thank you for your reply
    Attached Thumbnails Attached Thumbnails 3.jpg  

  4. #4
    Join Date
    Nov 2012
    Posts
    158

    Re: Line mark on the surface of product

    Thanks for pict. It is not very clear from images, what is going on. It can be also wall thickness issue or pressure marks. Do you have it also on short shots?

  5. #5
    Join Date
    May 2018
    Posts
    16

    Re: Line mark on the surface of product

    thank you for your reply
    there is no sink mark on the product, it is just like a white line around the product in the middle
    I thought that it is from the changing of flow direction inside the product( pic 2) so I am thinking to make it done more smoothly.
    that do you think?

    thanks and best regards

  6. #6
    Join Date
    Oct 2018
    Posts
    22

    Re: Line mark on the surface of product

    Could it be from color concentrate?
    Maybe try 100% regrind to see if it changes.

  7. #7
    Join Date
    Feb 2016
    Location
    San Francisco Bay Area, CA
    Posts
    199

    Re: Line mark on the surface of product

    Looks flow or temperature related
    Or maybe the part is stretching during mold opening

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