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Thread: Cross Linking

  1. #1
    Join Date
    Apr 2012
    Location
    Shenzhen, China
    Posts
    27

    Cross Linking

    What is cross linking and how does it pertain to injection molding?

  2. #2
    Join Date
    Nov 2014
    Posts
    11

    Re: Cross Linking

    hi, with in all the plastic configurations in injection molding we have 2 basic plastics type thermoset and thermoplastic, thermoset plastics become a solid by CROSS-LINKING molecules attaching to each others this type of plastic can be molded only ones they can not be re-melted

  3. #3
    Join Date
    Aug 2011
    Posts
    571

    Re: Cross Linking

    In materials like polyolefins one can get the required properties for the product, for example chemical resistance. But then they are not strong enough. Therefore you can cross link the material after it is molded to get the required strength. What cross linking does is that it 'joins' all the molecules to form a network and increase mechanical properties.
    As MeltFlipper says above, all thermoset molding processes do the same but the base in this process is not a thermoplastic that you melt and inject.

    Hope this helps.
    Suhas

  4. #4
    Join Date
    Jul 2015
    Posts
    21

    Re: Cross Linking

    Quote Originally Posted by meltflipper View Post
    hi, with in all the plastic configurations in injection molding we have 2 basic plastics type thermoset and thermoplastic, thermoset plastics become a solid by CROSS-LINKING molecules attaching to each others this type of plastic can be molded only ones they can not be re-melted
    Cross linking in plastic means that the plastic molecules are chemically bonded to one another. The chemical reaction that bonds the thermosets together("cross-links") can be anything from a catalyst to heat. Once that chemical bond is created between the plastics molecular chains the part can no longer be recycled/re-melted due to the chemical bonds breaking apart. Thermoplastic resins are kind of like spaghetti where it is a bunch of polymer chains tangled together that form a plastic. There is no chemical bond between the chains and that's why thermoplastics can be recycled/reheated.

  5. #5
    Join Date
    Apr 2012
    Location
    Shenzhen, China
    Posts
    27

    Re: Cross Linking

    Suhas,

    I understand the cross linking that occurs in Thermoset materials. The reason for my question is, our company was approach by a customer that asked if we were capable to do cross linking on a given product they were thing of placing with us. I don't what material, but it was a thermoplastic resin. I did a little research and there seem to methods of creating a cross linking in thermoplastics that improves the given properties of the resin. For example: Electron Beam cross linking.

  6. #6
    Join Date
    Nov 2012
    Posts
    101

    Re: Cross Linking

    can you post a brand name and type of the material please ....

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