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5. Impression feed modes
The way in which a mold cavity is fed has a decisive influence on the quality and price of injected parts. The mold cavity can be fed with cold runners, where the material is frozen at the moment of ejection, or hot runners, where the material remains in a molten state at the moment of ejection.
5.1 Cold runner injection
In the oldest and simplest feeding method, the molten polymer flows directly into the cavity via a truncated cone-shaped channel, the contents of which are called a sprue. When the mold has several cavities, filling is carried out from the central channel into a network of distribution channels that feed the cavities via weirs. Along the way, the material cools and gradually solidifies as the pressure drops.
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Impression feed modes
Special molds
Bibliography
Software tools
CADMOULD http://www.cadflow.fr/
Moldflow http://www.moldflow.com/
Simpoe http://www.simpoe.com/
Events
Forum International de la Plasturgie, takes place every three years in Lyon : http://www.f-i-p.com
K– Messe, Europe's leading plastics trade fair, is held every three years in Düsseldorf: http://www.k-online.de
Standards and norms
- Moulding tools – Thermal insulation foils in injection molds - NF ISO 15600 - Avril 2001
- Moulding tools – Tool specification form for injection molds - NF ISO 16916 - Août 2004
- Moulding tools – Injection nozzles – Dimensions - NF ISO 10072 - Mai 2004
- Moulding tools – Bracing pillars - NF ISO 10073 - Février 2009
- Moulding tools – Cylindrical-head ejectors - NF ISO 6751 - Avril 1999 ...
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