How To Select PET Injection Molding Machine

  • 2019-08-01
    PET Injection Molding Machine-DKM

    Are you the manufacturer of PET preforms? Are you plan to star new business of PET bottles? Maybe now you have the sample in hand or just idea of new item in your brains, but do you know how to select suitable model of PET bottle devices for your own projects? We prepared below information for your reference to show how to choose.


    Preparation before selecting PET injection equipment

    In the preparation process, you should make sure three points: preform weight, the neck diameter of preform, daily capacity. Based on the info, PET preform device supplier will recommend mold cavity and calculate mold dimension to you.


    Steps to select correct machines

    When we have the above information, we can select suitable plastic machines by following steps:

    1. Full injection

    In general, most PET preform mold is multi-cavity, in order to full injection, we should pay attention to the actual shot volume and screw diameter. 

       Actual shot volume= preform weight*mold cavity

    For better stability, the theoretical shot weight of machines should be 1.35 times at least of actual injection weight.

    2. Enough big machine to mold

    PET preform mold need put on injection machine for mass production. So the pet equipment should big enough to put the mold. We have to consider the tie-bar distance, mold height, minimum mold sizes. The height and width of molds should be smaller than tie-bar distance. Mold thickness should between max mold height to min mold height. It will be better that the mold dimension is bigger than the minimum mold size.

    3. Enough clamping tonnage

    Usually the machine tonnage is bigger, the clamping force will stronger. In order to insure plastic material melt into each mold cavity shot, it will require the PET injection machine with high pressure to push. Without the enough clamping force, the mold will be open and raw material will leak, even cause accident to molds and operators.

    4. Enough stoke to take out the product

    Based on the mold and pet preform size, we need to judge if the toggle stroke and ejector stroke is enough for product demould. It’s better to keep the toggle stroke at least twice longer than the products sizes in the direction of mold open and close. Ejection stroke should be enough distance to eject out the products.


    Sino Holdings Group is Chinese famous plastic injection molding machine manufacturer. We have several models machine, including PET preform equipment. Dakumar PET injection molding machine is widely used to produce preform, such as water bottle preform, juice bottle preform and milk bottle preform. Our company offer you not only machine, but a fine turnkey solution. Please contact us if you are interested.