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Injection Molding Production

We have talked about the basic practices of improving injection molding productivity and here we would like to add a couple of tips to it...

1) Allow specific injection molding machines to work on specific plastic parts. For this you can concentrate manpower and have specific trained people for specific parts. EG. components for Apple products must be halogen free so machines cannot be used for other products that have halogen in them and transparent plastic parts to be used on machines for transparent parts. So should also set aside machines for injection mold trials and machines for production.

2) Loading and unloading of injection molds can be time at 1 hour. This defers between big injection molds and small injection molds. How quickly this can be done really depend on facilities and the setup team. If you are running long term productions, the setting up time may not be a big issue.

3) Scrap reduction should be monitored before an injection mold is commissioned for mass production. In fact, after the injection mold trials were completed the injection mold should go thru a small batch production run of about 5k parts to fully monitor how the tooling is keeping up with the production and the amount of scrap it gathers. Basically, the amount of scrap during a mold trials should be kept below 20%. This includes purging of the barrel and attempts to full the injection mold. For bigger molds this may run different.

4) Mold maintenance technically should be done at different stages, simple maintenance and comprehensive maintenance. Simple maintenance to be done within 1 or 2 months time. This is to remove debris and clean up injection mold. This should take a day or maybe have a day to do. Comprehensive maintenance should be done at least once a year. This is to check the injection mold for damages and perform necessary changes. The time allocated depends on how severe the injection mold wears. The timing can change based on the confidence you have with your injection molds.

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