Two Different Types of Injection Molding

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Two Different Types of Injection Molding

(Below article is extracted from www.ehow.com - Two Different Types of Injection Molding)

Injection molding is a manufacturing process for producing high volumes of finished parts at a low cost per part. (If you have a new product design, and you want to do massive production, you will need to make it by injection molding : which mean you need to have a mold, then producing parts from the mold.) Various plastic or rubber parts are produced in a wide range of colors. The injection molding machine injects heated molding material to the part mold through input channels. The two principal types of injection molding machines use either a cold runner channel or a hot runner channel.

Cold Channel Injection Molding

Cold channel injection molding machines cool the entry channel, or runner, after each part is molded and ejected. During each molding cycle a part is produced with material in the runner channel. After the part is ejected, the runner is waste material and must be separated from the molded part. Runner waste is reground and reused or thrown away. Disposed material affects part cost. Reground and reprocessed material may affect part quality. Changing part colors in a cold runner machine is fairly easy since each ejected parts carries the material with it. Cold runner machines offer the advantages of cheaper mold designs, lower maintenance costs and lower operator skills.



Hot Runner Injection Molding

Hot runner injection machines keep the runner portion of the mold hot. This reduces or eliminates runner scrap material, which may reduce part costs. Hot runner machines are more expensive than cold runner machines. Hot machines require more skilled operators and require costly maintenance. Changing colors in hot runner machines is difficult because material is hard to remove from the runners. Hot runner machines eliminate wasteful runner scrap and the need to separate them from molded parts.



You can choose these two principal types of injection molding, upon to your own needs.

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