Injection Mould Cooling System

The operating temperature for a particular mould will depend on a number of factors which include the following: type and grade of material to be molded; length of flow within the impression; wall section of the molding; length of the feed system and so on. It is good to use a slightly higher temperature than is required just to fill the impression, as this tends to improve the surface finish of the molding by minimizing weld lines, flow marks and other blemishes.

To maintain the required temperature differential between the mould and plastic material, water is circulated through holes or channels wihthin the mould. These holes or channels are termed flow-ways or water-ways and the complete system of flow ways is termed the circult.

During thr impression filling stage the hottest material will be in the vicinity of the entry point, that is gate, the coolest material will be at the point farthest from the entry. The teperature of the coolant fluid, howerve, increases as it passes through the mould. Therefore, to achieve an even cooling rate over the molding surface, it is necessary to locate the incoming coolant fluid adjacent to hot molding surface and to locate the channels containing heated coolant fluid adjacent to cool molding surface. However, it is not always practicable to adopt the idealized approach and the designer must use a fair amount of common sense when laying out coolant circuits if unnecessarily expensive moulds are to be avoided.

In general, the simplest systems are those in which holes are bored longitudinally through the mould plates. However, this is not necessarily the most efficient method for a particular mould.

When using drillings for the circulation of the coolant, however, these must not be positioned too close to the impression (closer than 16mm) as this is likely to cause a marked temperature variation across the impression, with resultant molding problems.

All in all, waterchannel is very important for a mould, like water for fish. So if you want to learn more about water channel, pls kindly contact me, Ima glad to reply you.

Post by Miss Mandy

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