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57. Mold Design: Hot Runner Systems
The hot runner product design should be balanced for even flow throughout the runner system. Externally heated manifolds work the best for RTP TPE materials. Internally heated systems, which use cartridge heaters, are not recommended since they generally have hot spots which could lead to material degradation. All flow channels should be highly polished with radius corners to minimize the possibility of material stagnation. To maintain high shear, low residence times, and provide for self-clearing. Balance volume per shot size.
Benefits
Improved economics - less scrap
Faster cycle time - sprue never freezes off
20% to 25% lower total cycle time common in >16 cavity systems
Can be very significant in large (16 or 32 cavity) cold runner systems
More repeatable pressure to feed runner system
Lowers part size variation in critical dimension components
Disadvantages
Higher capital cost
Typically more time to tune custom molds in on initial start up
Must be purged at end of molding shift
Potential for material degradation (if TPE is over heated)
Typically higher maintenance cost
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