what is the function of cold-slug? It’s purpose is to store cold slug created intermittently by the nozzle due to heat loss and low temperature. Cold slugs could clog or slow down the material flow in runner and cavity and cause cold scars or cold marks on plastic part.
Cold slug well is a very imporant part of plastic mold design. It is defined as the small nub of plastic that cools and solidifies inside the nozzle tip during the cooling cooling phase of the injection cycle. It is designed to store cold slug caused intermittently by the nozzle due to heat loss and low temperature. Cold slugs could clog or slow down the material flow in runner and cavity and cause cold scars or cold marks on plastic part. The cold slug well is usually placed at the end of primary runner. When the branch runner is too long, cold slug well should be designed as well to store the front plastic cooled by mold.
Cold slug well is a very imporant part of gate system and it should not be neglected at mold design.
For molded plastic part made from flame-retardant PC, the design of cold well determines the the quality of injection molding parts. In order to achieve the corresponding fire resistance grade, a large number of flame retardants have to be added to the PC ,where the proportion of flame retardants is even 20%, so the processing temperature of the flame retardant PC cannot be set very high.Normal processing temperature of the PC is 320°C, but the processing temperature of the flame retardant PC is generally 270~290°C, and some PC can even be processed at 240~250°C. If the flow of the PC cannot be increased by raising the temperature, the runner design of the plastic mould needs to be more reasonable. Especially the design of cold wells, the diameter should be slightly thicker than the main channel, and it is slowly thickened. Besides, there should be reverse hook to prevent the cold plastic slug in the well from being washed into the molding parts again because of the high pressure of the plastic fluid. It is also important to note that the corner of the channel is prone to cause stress concentration and round corner should be designed as large as possible.
Many people think the fat end of a cold sprue is there simply to pull the sprue out of the sprue bushing when the mold opens. While it often is tasked to do that job, that’s not the cold slug well’s only function. Its primary function—as the name suggests—is to act as a trap, or “well,” for the cold slug. What’s the cold slug? It’s the small nub of plastic that cools and solidifies inside the nozzle tip during the cooling phase of the injection cycle.
This occurs because—while the nozzle is heated—the tip of the nozzle is pressed against the cold, water-cooled mold steel. The cold slug that forms at the nozzle tip is actually kind of handy in that it can act as a small plug to prevent drool during ejection. The problem is that during the next shot that little nub of cold plastic has to go somewhere, and you’d rather it not go into your part! Or just as bad, it can lodge in a subgate or pinpoint gate, partially blocking the flow.
actually cold slug is a very important design in an injection mold design
it is a very good share, yes! some mold designers often ignore it
cold slug design is very improtant in an injection mold
Thanks for sharing, it seems that you can help us a lot for our products, I will contact you
in every injection mould with cool runner system, cold-slug is very important
actually cold-slug is an important design in a plastic injection mold with cold runner system
cold slug is a very important component is a mold
Believe it or not, sometimes some mold designers really ignore it
sometimes some mold designers often ingnore it.
cold-slug is very important in a mould with cool runner system
thank you so much for sharing that kind of blog, that is very good!
maybe my younger brother need this blog:-)I will tell him to come here
I believe that every mold designer knew it:-)
thanks for sharing your professional expereoince. it will benefit many mold engineers
sometimes, some mold designers will ignore it,It will be a fatal mistake
thanks for sharing, it is very useful
yes!your introduction reminds me
yes! this is a mold design detail, sometimes some mold designers ignore it
we are glad to hear you share our blog with all your friends
I alll thee time emailed this blog post page to all my friends, as
if like to read it aftdr that my links will too.
Hi there too all, the contents present at this site are inn fact awesome
ffor people knowledge, well, keep up the ice work fellows.
thanks for your comment
you are in reality a jist right webmaster. The site loading
velocity iss amazing. It sort of feeels that you are doing any distinctive trick.
Also, The contents are masterpiece. you haqve don a great
activity inn this subject!
thanks for your compliment