Technically, i want to know if injection mold screw really affects the quality of the part produced. Most textbooks have studied emphasizes that the screw only has greater and significant effect on extrusion and not on injection molding process. Considering the fact that the injection mold screw in injection molding processing is responsible for the mixing of the resins and transportation of the melted polymer. if the mixing through the injection screw is not properly mixed, how can we have a good product quality? However, another researcher i asked similar question said that the injection mold screw only has significant effect on the crystalline structure of the melted polymer and not on the final molded part produced. I need further explaination on that please in a very technical form.
There are so many different types of screws out in the market and a lot can be said on many of the screws and or what happens in each zone. To keep it short and simple, depending your resin you are using, plus throughput, will determine how much the screw will have different effect on the polymers. You have your resin entering the feed zone to get it ready for the transition zone and depending the resin type if you need more or less in this zone. The transition zone will do your majority of melting and mixing. When the resin reaches, the metering zone is where you complete your melting and mixing of your polymers. So depending your polymers on what screw would get your resin to mix and flow properly with little shearing in the screw and the mold etc. Therefore your quality can be greatly affected with the wrong screw, due to not preparing your polymers properly without damaging polymers and to have it flow properly and with consistency.
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