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  1. Replies
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    Re: Soft Cap , need advice

    That is a great idea.... will do as soon as boss gives me permission to do damage to his only part.

    Thx!,

    Joel
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    Soft Cap , need advice

    Hi to all,

    I don't have much experience with this kind of material, or part design for that matter, so looking for any help I can get....

    My boss wants to quote this.... I have looked at it...
  3. Thread: Flow Lines?

    by Joel JS
    Replies
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    Re: Flow Lines?

    Hi,

    Well, my old eyes can't see em very well either,....... guessing these are heat related "flow lines,"........ also guessing these are direct gated hot drops??? ...... if so take an actual...
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    Re: Fines in Material, BlackSpecs

    Thank Iautry!.. Your ideas are duly noted.

    Has anyone used a machine that sucks out the fines? ........ it's still just way too quiet here!

    Joel
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    Re: Injection Graphic

    Hello Mr Rookie,

    A lot of this graphical interpretation has to go along with what you're asking the machine to do, and looking at the part a the same time, ..........so, I am just guessing here...
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    Fines in Material, BlackSpecs

    Hello Everyone,

    Been kinda quiet here lately, so hoping I can stir the pot! :D

    We have this clear lens job that has about 20% fall out for black specs... and we don't see much improvement after...
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    Re: Multiple Defects

    Hey,

    Without knowing all the juicy details, here's some thoughts:

    What happens when you short it enough that you can see the short...... does it look like the melt flow will likely trap gas in...
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    Re: Loud noise when mould opens.

    Hello

    Glad that you figured it out

    However, As I understand the noise went away when you went to 100% on all opening speeds and otherwise you heard a thump. If this is true then I would...
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    Re: Hot runner cleanİng

    Typo Correction........We use Purgex 459 Plus!

    thx, Joel
  10. Replies
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    Re: Hot runner cleanİng

    Hi,

    We use purges 459 Plus and it works pretty well. You have to let it sit for 5 minutes then purge it out. For very tough jobs I would give it two rounds, and still might have to throw away...
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    Re: Silver Fibers show Up when Parts are Rubbed!

    Yes, the natural base resin still has fibers.

    thx! Joel
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    Re: Cushion Changes with Pack Time

    Hey Rookie,

    You are on the right track. And it's perfectly fine to do a "gate freeze" on a hot runner, although the terminology is admittedly not correct.. So, in this case, just take your...
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    Re: Material Stock Temperature

    Hi James,

    I doubt it....but easy to verify, just drain the cold, and refill with hot mat'l, while the machine is running.

    Perhaps try reducing rear barrel temps as the material's residence...
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    Re: Cushion Changes with Pack Time

    Plastic is compressible, so you will often see cushion vary with more pack time, especially in a hot runner tool. (The parts however will get to maximum weight that will not further increase at gate...
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    Re: Silver Fibers show Up when Parts are Rubbed!

    JayDub,

    The job is not currently running, I did not notice any peculiar pressure spikes on the graph.

    thx!
    Joel
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    Re: Silver Fibers show Up when Parts are Rubbed!

    Chris,

    Fibers show up when you rub parts in the direction of flow, and the fibers generally appear to be in the direction of flow as well.

    It does not look like typical delamination, where you...
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    Re: Silver Fibers show Up when Parts are Rubbed!

    Hello Group,

    Still having this issue, has anybody seen this before?

    JayDub, I tried a fill only / short part so there was no gas trap issue and still got the silver fibers.

    (I can move...
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    Re: HOW TO FIND ANGLE - UNDERCUT -Slide Unit

    See if this helps,
    Joel
    361
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    Re: Molding w Flame Retardant

    thx for the advice guys!.......good to know.

    Joel
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    Re: New Technology For Injection Molding

    Hi Penny,

    Micro-molding is interesting, molding things the size of plastic pellet or smaller,... Lots of good ideas flowing in, whatever you decide, you'll have to send us your final paper! :-)
    ...
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    Re: Pin Hole in Gate

    Hello,

    Try, (one at a time)

    1. Slow the injection rate, as it enters the gate area
    2. More pack time
    3. Reduce Drop Temps

    Joel
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    Re: abs surface finish

    Hello,

    I have seen numerous times a nozzle temp reading 450F, but actually 550F, and causing those issues with ABS. I agree with Bryan, and suggest taking a temperature probe, and sticking it...
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    Re: Gas bubbe on worm thread surface

    When you get something that has such a small amount of defects, the best way to figure it out is to try to make it worse so you can actually see what is causing it...... so, try no back pressure for...
  24. Thread: metallic color

    by Joel JS
    Replies
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    636

    Re: metallic color

    If it makes you feel better, I had this same problem, to a lesser extent, and ended up telling the customer that this is inherent with metallic color, which I believe is true. One idea is to come...
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    Re: Molding w Flame Retardant

    Thanks for the info, will be keeping those ideas in mind.

    Joel
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