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Thread: Injection molding of ABS Plastic and TPR Material

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  1. #1
    Join Date
    May 2012
    Posts
    2

    Injection molding of ABS Plastic and TPR Material

    Hi,

    I am working with a Chinese manufacturer to create a new product that uses ABS plastic and TPR material. The manufacturer injected the TPR material alongside the ABS plastic (thus avoiding the use of glue), but they informed me that for some reason that the TPR material and ABS plastic are not sticking well together. Does anyone have any recommendations on how to solve this issue? Any advice that I could send to the Chinese manufacturer would be greatly appreciated.

    Cheers,
    Greg

  2. #2
    Join Date
    Aug 2011
    Location
    Upstate of South Carolina
    Posts
    701
    Contact Kraiburg. They have grades just for ABS and other engineered resins. I worry that your supplier is not molding the substrate, then over molding the part. That will make the control of the two melts very difficult, and increase the scrap produced. Also you will have a hard time finding a viable means to recycle the scrap parts from these types of processes.
    The best method is to purchase a press just for this process. Then inject the ABS, and pull the core or rotate the mold halves, then ASAP inject the TPE onto the substrate. The higher the surface energy of the substrate, the better your bond strength will be.
    Hope this helps, Rick.

  3. #3
    Join Date
    Aug 2011
    Location
    Santa Rosa, CA
    Posts
    95
    You can also do it as an overmold, but "anchors" need to be designed into the first shot so the overmold will hold.

  4. #4
    Join Date
    May 2012
    Posts
    2

    Injection molding of ABS Plastic and TPR Material

    thanks so much Rick and PJ. I will definitely pass along your suggestions to the manufacturer.

    Thanks again.

    Cheers,
    Greg

  5. #5
    ABS is never sticking well to TPR that is coming from their nature behavior. However, you still can force them to stick together which is to intently design certain "undercuts" on slier location so that to force them stick well. My project has had one plastic part similar to yours and using double injection. by the way, do not use overmolding cause that brings more issues you are not expected. Hope it helps.

    Lin

  6. #6
    Join Date
    Sep 2014
    Location
    UK
    Posts
    4

    Re: Injection molding of ABS Plastic and TPR Material

    Yes, Abs plastic is never sticking well to TPR because of their natural behavior. TPR plastic are used to produce the soft material like soft toys and plastic handle etc.

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