Newbie Vacuum Forming Shrinkage and Control

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Thread: Vacuum Forming Shrinkage and Control

  1. #1

    Default Vacuum Forming Shrinkage and Control

    Hi Everyone,

    We recently go into Vacuum forming process. We mostly form 0.125'' HDPE sheets to build fenders and other panels. I know from online research that HDPE has high shrinkage rate and needs to be controlled carefully.
    So once the molds are pulled, how long should one cool them? I wanted to know the timings of the cooling cycle. Also based on the few trial parts pulled, which were cooled to room temperature before taking off the machine.
    I have observed that the parts warp a lot. Should the parts after being pulled and cooled, still be mounted on a fixture to control warp and further shrinkage? I am having a lot trouble dealing with the shrinkage and how to control it.
    And advise, manuals or documents on this would be truly appreciated.

    Thank you.

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  2. #2

    Default Re: Vacuum Forming Shrinkage and Control

    Jai,

    Did you ever get any help with the shrinkage and warping issue? I am having the same problem trying to form table tops.



  3. #3
    Allplastic's Avatar
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    Default Re: Vacuum Forming Shrinkage and Control

    Hi Jai
    Please provide a photo of your machinery and ill try to help as much as i can.



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