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  1. #1
    Join Date
    Oct 2006
    Posts
    31

    How was this molded?

    This is a nose cone of a toy glider. I'm trying to figure out how to make a similar one. It is hollow, ~5" long, with a wall thickness of ~.014". Notice the D shape at the tip and the small round hole - perhaps they are clues. Is it likely injection molded or vacuum formed or something else? I can barely see a seam all the way around and at one spot the seam is not so uniform hinting at sealing by manually pressing a heating element to seal but the rest of the seam seems too clean for that.

  2. #2
    Join Date
    Jan 2016
    Posts
    120

    Re: How was this molded?

    I'd guess it's blow molded, but I'm not sure...

  3. #3

    Re: How was this molded?

    Probably blow or centrifugal molding. Both can result in no seam because they expand a uniform pellet.

    The hole is to allow airflow as it expands.

    Not my area of direct experience though, hopefully someone with more knowledge can weigh in. I've only done injection molding.

  4. #4

    Re: How was this molded?

    That seam might be a witness line where two mold halves fit together, rather than a true seam.

    Otherwise it might have been two molded halves that are welded together, with that hole being a locating pin that they for some reason stuck through the part... but I'm still leaning towards a blow/spin mold.

  5. #5
    Join Date
    Nov 2014
    Posts
    729

    Re: How was this molded?

    As soon as I saw the photo I thought blow molded just as others have said. I worked in injection, blow, and rotational molding for 12-13 years.
    David
    Romans 3:23
    Etsy shop opened 12/1/17 - CurlyWoodShop

  6. #6
    Join Date
    Jun 2022
    Posts
    1

    Re: How was this molded?

    How about gas-assisted injection molding? Such as this:

    _https://www.youtube.com/watch?v=xFcDKsP4418_

    You might need to cut and paste as it does not allow url link.

  7. #7
    Join Date
    Oct 2023
    Posts
    1

    Re: How was this molded?

    Quote Originally Posted by swisscheese View Post
    This is a nose cone of a toy glider. I'm trying to figure out how to make a similar one. It is hollow, ~5" long, with a wall thickness of ~.014". Notice the D shape at the tip and the small round hole - perhaps they are clues. Is it likely injection molded or vacuum formed or something else? I can barely see a seam all the way around and at one spot the seam is not so uniform hinting at sealing by manually pressing a heating element to seal but the rest of the seam seems too clean for that.


    I can't see the drawings or other things you sent, only the text, so I can't answer your question. But I know that most common plastics are solved by processes such as injection molding or blow molding. If you need it, you can send me an email [email protected]

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