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 SPE book for understanding melting process
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Philco Senior Member Posts: 7 |
posted August 23, 2006 12:06 PM
   
Hi, I would like to know if they are a good book from SPE or maybe elsewhere that explain the melting process. (I'm an injection molder, sorry to post here but it have alot of activity here and it also related to extrusion.) The main reason is I use a colour that have someking of wax as pigment carrier and this wax make lubrification in the barrel so the melt tend to not flow forward the screw, it tend to turn with the screw instead. And I think I'm loosing shear rate with this so this is why I want to understand well the effect of this and also understand all the melting process as I'm a newbie. Thanks! IP: Logged |
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Tom C Moderator Posts: 755 |
posted August 23, 2006 09:40 PM
Yes wax in the feed throat is bad. Find a different carrier for you colorants, there is no other way around it. Lots of books at The melting process is so complex that guys like myself depend on modeling software, just like you injection guys use MoldFlow. ------------------ Tom Cunningham www.ExtrusionTechnicalServices.com IP: Logged |
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Philco Senior Member Posts: 7 |
posted August 24, 2006 11:21 AM
The main reason why I use this colorant is it doesn't make mess everywhere. I have asked my supplier to give me some advice on this but is there any other way to make this work correctly? As our barrel doesn't have cooling channel in the throat zone, I can't raise the temp of the feeding zone to melt the plastic sooner. Maybe if I make the startup with a cooler feeding zone and when the machine is running I raise this up, maybe it could help... I will try this tomorow. I never use modeling software as I don't need it beacause we are injection-blow molder so our injected parts never have to be complex, it's only preform but I would like to play with this kind of software someday. Thanx Tomc! IP: Logged |
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Tom C Moderator Posts: 755 |
posted August 24, 2006 11:58 AM
It is very typical for molders to buy color concentrates pre-dispersed in their base resin, or a universal carrier resin like EVA or EMA. Sometime liquid colorants are used, but they can cause slipping problems also. Many molders find the best quality parts are produced using resin which has been pre-colored at a compounder. ------------------ Tom Cunningham www.ExtrusionTechnicalServices.com IP: Logged |
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