Final answer:
Hot runner molding is a process wherein the sprues and runners are kept hot by heating elements built into the mold. It eliminates waste and reduces cycle time, allowing for continuous production. This method helps prevent defects and ensures high-quality parts.
Step-by-step explanation:
The process described in the question is known as hot runner molding. In this process, the sprues and runners, which are channels that allow molten plastic to flow into the mold cavity, are kept hot by heating elements built into the mold.
Hot runner molding is used to eliminate waste and reduce cycle time. It allows for continuous production without the need for removing and reprocessing the runners and sprues. The hot runners maintain the plastic at a controlled temperature, ensuring consistent and efficient molding.
One notable advantage of hot runner molding is that it helps prevent the occurrence of cold spots, which can result in defects in the final molded product. By keeping the runners and sprues hot, the plastic maintains its flow properties, resulting in high-quality parts.