A hot runner mould system is an assembly of heated components used in plastic injection molds that inject molten plastic into the cavities of the mold.
By contrast, a cold runner is simply a channel formed between the two halves of the mold, for the purpose of carrying plastic from the injection molding machine nozzle to the cavities. Each time the mold opens to eject the newly formed plastic parts, the material in the runner is ejected as well, resulting in waste. A hot runner mould system usually includes a heated manifold and a number of heated nozzles. The main task of the manifold is to distribute the plastic entering the mold to the various nozzles which then meter it precisely to the injection points in the cavities.
Hot runner moulds are fairly complicated systems, they have to maintain the plastic material within them heated uniformly, while the rest of the injection mold is being cooled in order to solidify the product quickly. For this reason they are usually assembled from components premanufactured by specialized companies. Two main types of hot runner mould systems are the externally heated and internally heated. In the externally heated type, molten plastic runs within a solid manifold and within the nozzles. In the internally heated, (now obsolete) the plastic flows directly over slender heaters inside oversized runners. The outside boundaries of the runners normally solidify, so the plastic material flows only in proximity of the internal heaters or "torpedoes". A hot runner mould controller is a temperature controller used to control the temperature in the hot runner. This helps create the most consistent part(s).
Hot runner moulds usually make the mold more expensive to manufacture and run, but allow savings by reducing plastic waste and by reducing the cycle time.
Hot Runner Mould | Hot Runner Mould System | Hot Runner Injections Mould | Hot Runner Plastic Injections Mould | Hot Runner Mould Plastics | Hot Runner Mould Manufacturers | Hot Runner Mould Exporters | Hot Runner Mould Suppliers | Hot Runner Injection Mould System | Hot Runner Injection Moulding | Hot Runner Mould Design | Hot Runner Plastic Mould | Hot Runner Mould Maker | Hot Runner Mould Production |
