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  1. #1
    Join Date
    Jul 2017

    Angry Plastics Injection

    How Plastic Injection Moulding Design Works?

  2. #2
    Join Date
    Mar 2012

    Re: Plastics Injection

    You can find a lot if you Google it. Suggest you check out https://www.protolabs.com/services/i...ction-molding/ They used to have a free Ebook on how injection molding works and design guidelines. I am sure if you email them they can send it to you. I can't find it on their site. Also click on their resource center and read a bunch there.

  3. #3
    Junior Member
    Join Date
    Jan 2017
    Here you can find SolidWorks fully parametric standard mold base and mold parts for free:

    You will also find some tutorials on the site but you also can find them here:

  4. #4

  5. #5
    Junior Member
    Join Date
    Jan 2019
    Here is the answer for How Plastic Injection Moulding Design Works :

    Which polymers are best for plastic injection molding?

    All thermoplastics, like polyethylene, polypropylene, polystyrene and nylon are ideal for plastic injection molding, as are certain elastomers/rubbers, thermosets and composites. The best way to choose a material is to consider what the end product will be used for. This will help you identify the characteristics you’ll need, like strength, flexibility, and so on.
    How does a plastic injection molding machine work?
    First, your product needs to be designed – this will typically be done by an industrial designer or engineer – and a mold created, which will be done by a mouldmaker or toolmaker.
    Next, granules of the material you’ve chosen for the product will be fed via a hopper – which works much like a funnel – into a heated barrel. These materials need to be melted down, which is achieved by heater bands combined with the frictional action of the injection molding screw.
    The melted plastic is then injected via nozzle into the mold, and allowed to cool and set. The mold tool is placed on a moveable platen until it has hardened. The platen then opens and the part is expelled from the mold using ejector pins. It’s interesting to note that the mold remains at a stable temperature, which means the part can begin to solidify almost immediately.
    The mold
    The mold, also known as the die, is the tooling used to create the plastic parts in molding, which we mentioned above. A toolmaker (or mouldmaker) will usually construct it out of steel, and precision-machine it to create the exact shape required.
    What is an injection molding cycle?
    The sequence of events that take place to produce a plastic part is known as the injection molding cycle, and it begins when the mold closes. The next step of course is the injection of the material into the cavity of mold. When the cavity has been filled, a holding pressure is applied to overcome any material shrinkage that may occur.
    Next, the screw turns, and this causes the next shot to be fed to the front screw. The screw then retracts while the following shot is prepared.
    When the part has cooled and set, it’s ejected from the mold. This is the injection molding cycle, and its speed will depend on your mold and the type of part being produced, as well as the materials used for the parts and the molds.
    Are all plastic injection molding processes the same?
    Mostly, they’ll all follow the cycle described here, but there are some types of processes that differ from the norm, for example: sandwich molding, gas-assisted injection molding, in-mold decoration and in-mold lamination, microcellular, microinjection and push-pull injection molding, structural foam injection molding, powder injection molding, multiple live-feed injection molding, and rubber injection molding among others.

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