The molding machine closes the mold and, thanks to the clamping tools, the mold stays closed during the plastic injection molding. Read more about clamping and clamping force. The plastic is fed into the IMM in the form of granules or pellets. The molding machine heats the plastic until it is liquid. The nozzle of the injection molding machine then injects the melted plastic into the mold injection pressure. The cavity of the mold is now filled with the plastic liquid.
This will then cool down to form a solid product. Finally, ejectors push the cooled product out of the machine as a finished part. The injection moulding process is complete. The cycle time of the plastic injection molding process can be broken down into the injection time, cooling time, and the resetting or changeover time.
By reducing any of these times, production cost is lowered. Frequent mold changes allow inventory to be reduced and provide faster response to market requirements. One of the best practices requires a fully automated mold change. Not only will this decrease change over time, but it will also make the manufacturer a lot more flexible in his production quantity. An example of this is shown and explained in the article on the demonstration setup as made by Krauss Maffei , MundiMold and EAS change systems.
A molding consists of a sprue to introduce molten resin, a runner to lead it to cavities, and products. Since obtaining only one product by one shot is very inefficient, a mold is usually designed to have multiple cavities connected with a runner so that many products can be made by one shot. If the length of the runner to each cavity is different in this case, the cavities may not be filled simultaneously, so that dimensions, appearances or properties of the moldings are often different cavity by cavity.
Therefore the runner is usually designed so as to have the same length from the sprue to each cavity. Use of reprocessed materials. Sprues and runners among moldings are not products. These portions are sometimes discarded, but in other cases they are finely reground and reused as materials for molding. These materials are called reprocessed materials. Reprocessed materials are not solely used as materials for molding but usually used after blending with virgin pellets, since there is possibility of deterioration in various characteristics of the plastics because of the initial molding process.
For the properties when reprocessed materials are used, please refer to "reprocessing capability" in the plastic data base. Molding condition means cylinder temperature, injection speed, mold temperature etc.
Depending on the conditions selected, the appearances, dimensions, and mechanical properties of the molded products change considerably. Therefore, well-tried technology and experience are required to select the most suitable molding conditions. The standard molding conditions for our materials are shown below. Please click the mouse at the following names of plastics. This website uses cookies. Our animation will show you the whole process of creating a plastic component through injection molding.
From taking and melting the raw plastic, to molding it into its form and processing it ready for final use. By melting thermoplastic and injecting it into an aluminum mold at high speed and pressure, manufacturers can create multiple complex parts at once. Although on the face of it, the process may seem simple, there are many elements which can alter to ruin the overall quality of the plastic component produced.
Experienced manufacturers will be able to balance the requirements of the part with the parameters of the process to ensure that the manufactured component is high-quality enough to perform its final usage effectively.
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