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  1. Replies
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    Re: Help w Polycarbonate Black Specks

    Sorry for the late response, we ended up moving the mold to another machine/facility where it works better..

    but thanks for the feedback. Also now seeing and wondering what have you seen as...
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    Re: Help w Polycarbonate Black Specks

    Ok Thx for the tips,

    Joel
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    Help w Polycarbonate Black Specks

    Hello,

    I have run Polycarbonate clear in the past but this one job we always fight black specks. Looking for ideas to solve.

    We have pulled and cleaned screw and barrel, and on the very...
  4. Thread: Very Hot Water

    by Joel JS
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    6,039

    Very Hot Water

    Hello,

    Has anyone used pressurized hot water, up to 400f!, using specialized equipment, instead of hot oil, and can give me pros and cons. (Considering equipment of such from a company called...
  5. Thread: Floppy parts

    by Joel JS
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    Re: Floppy parts

    Thanks Rick!....... :-)

    Yes same resin, different lot, but did not see change immediately upon lot change (if our paperwork is right.)...... I am thinking Talc too, too little yeah. Part weight...
  6. Thread: Floppy parts

    by Joel JS
    Replies
    3
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    7,413

    Floppy parts

    Help!

    I am running a substrate that gets overmolded with a tpe... the substrate was previously more rigid and now is floppy and flashes easily in the overmold. (The substrate looks like a book...
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    cashew gate with acetal

    Hello,

    New mold design with cashew gates and acetal (Delrin 100 NC 010) ....... this sounds like trouble to me with gates breaking.

    Has anyone had success with this combo? or just steer clear?...
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    Re: How accurate are Mold Flows?

    Much Appreciated Nikom, thx!

    Joel
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    Re: Inconsistent Shrinkage Rates

    Any luck on this?...... sounds like it's moisture related if you are inconsistent, as another user pointed to. Try to put parts in 3 different "Lots" ... First lot put parts in bags sealed tight,...
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    How accurate are Mold Flows?

    Hello gang,

    Wanna poll all you guys here, because I am not the expert with mold flows:

    I am being asked to approve a gate design based upon a mold flow analysis, and I don't know how...
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    Process Sheets (Control) Suggestions

    Hello everyone,

    Looking to see what others have done in regards to Process Control / Process Sheets.

    Currently, we have a standard process sheet that has all the inputs and outputs of the...
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    Re: Tooling RFQ Ideas?

    Hey Chris,

    Perhaps these are outside your intended scope, I am more of a process guy, but these things come to mind:

    - Moldflow included?
    - Warranty on # of shots
    - Parts fall freely or must...
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    Re: Flakes in Mold, gating?

    Thanks JPlynn and Rick for the feedback... I do like the idea of sharpened, and Smaller Gates..... (the mold is brand new, Shees!)

    Thanks again,
    Joel
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    Re: Proposal of Acetal in a Hot Manifold

    Well, I voiced my opinion, and the ship has sailed...... let's see how it comes out.

    Thanks,
    Joel
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    Flakes in Mold, gating?

    Hello all,

    So I just sampled this new tool and everything looked great..... well.......until we starting noticing a lot of parts with flakes on them, attached at the parting line. (And looking...
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    Re: cashew gate in pc/abs?

    Thanks to everyone for their feedback!.... I will try to push this job in another direction in gating.

    Thanks again,
    Joel
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    Re: Proposal of Acetal in a Hot Manifold

    Thanks everyone for their replies, and confirming my suspicions!.... Much appreciated.

    Joel
  18. Replies
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    cashew gate in pc/abs?

    Hello All!

    Hope everyone is safe, and productive.

    I got a request to review a new mold being built, and the PM would like to use a cashew gate so that no trimming is required, but the material...
  19. Re: Chiller water is getting dirty and brownish color

    Hi,

    Yes there are, I am not the expert, but we have a "water" guy come by every, say every 4 months(?), and test our tower water and add chemicals to it .... our water is still murky looking,...
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    Proposal of Acetal in a Hot Manifold

    Hello to all!

    A new job has come across my desk, a proposed new mold to be built with a hot manifold, direct gated, using acetal... as I have never seen this particular combo, I wanted to see if...
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    Re: Help: Acrylic Black Specks and Pitting

    Thanks Rick, ... will investigate your ideas. Joel
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    Re: Run mold water at 248F !

    OK Thanks Rick.
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    Re: Help: Acrylic Black Specks and Pitting

    OK J

    The material is pre-colored grey, thx for the feedback!

    Joel
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    Re: Run mold water at 248F !

    OK, thanks everyone for feedback :D

    Joel
  25. Re: Increasing gate size to 3 x wall thickness - polycarb

    Hi,

    If I understand this, wall thickness is 2.5-3mm and gate is 6mm, so my opinion is that increasing gate size will not help.

    Joel
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