The main advantage of Plastic Injection Parts (XINGHUI) is the ability to expand production on a large scale. Once the initial cost is paid, the price per unit during injection molding will be very low. As more parts are produced, prices tend to fall sharply. Other advantages include:
Compared with traditional manufacturing processes (such as CNC machining), the rejection rate caused by injection molding is low, while CNC machining can reduce most of the original plastic blocks or sheets. However, this can be disadvantageous compared to additive manufacturing processes with lower scrap rates like 3D printing.
The gate is just a channel that guides the molten plastic from the injection molding machine nozzle to the entire injection mold inlet. It is a separate part from the mold itself. A runner is a channel system that typically meets with a gate in or as part of a mold, and directs molten plastic into a part cavity within the mold. You can read about the two main categories of hot runners and hot runners here. Finally, the gate is part of the channel that leads directly to the part cavity after the runner. After the injection mold cycle (usually only a few seconds long), the entire molten plastic will cool, leaving solid plastic in the gates, runners, gates, part cavity itself, and a bit of overflow on the part edges flow.
A thermosetting material (such as epoxy, which cures when exposed to air) is a solidified material that, if you try to melt it, will burn after curing. In contrast, thermoplastic materials are plastic materials that can be melted, cooled and solidified, and then melted again without burning. For thermoplastic materials, this material can be recycled. Sometimes this happens exactly on the factory floor. They grind the gate / runner and any scrap. They then added the material back to the raw materials of the injection molding machine. This material is called "reground". Usually, the quality control department limits the amount of regrind that is allowed to be placed back into the press. Or, if they have a lot, the factory can sell this reground product to other factories that can use it. Generally, regrind materials are used for low quality parts that do not require high performance.
