Changing the colour or resin in an injection moulding machine can be a time consuming and costly task but it’s one that cannot be avoided. Making sure that all the flow paths in your machine are clean is imperative if you want to ensure that the next colour or resin is not contaminated.
Lost production time and scrap resin costs don’t have to set you back and prevent you from competing effectively. There are tips and tricks that companies can use to reduce these losses and we explain six in this two-part post.
Reduce shot size
For large tonnage presses (greater than 200 ton) experts recommend reducing the shot size when performing a colour change. According to experts at Ultra Purge reducing the shot size to 10% of the maximum allowed shot size will work the check ring more allowing it to clean out faster. The short burst out of the nozzle or hot runners will also put out more colour.
Shutting down your machines seems like a relatively simple tip however its one that can really help because shutting them down correctly will make the start-up process much easier. Purging your machine before start-up will also make sure that the amount of degraded material on the screw is reduced which also aids with better start-up.
Follow the guidelines
If you want things to work as they should you need to follow the instructions given to you by your purging compound supplier. These instructions have been specifically developed to help you save time and money. Once you’ve got a thorough understanding of how things are meant to work you can then experiment to try and find your own ways to help save you time and money.
Lookout for part 2 of our post where we look at three more tips for purging your injection moulding machine.
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