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  1. Re: “Splay” issue on PA66 GF30% with UV stabiliser.

    You can try to reduce residence time in the material hopper or increase temperature at the material feed (flange). One more option is to increase tool temperature (im working with PA 66 but with fire...
  2. Re: “Splay” issue on PA66 GF30% with UV stabiliser.

    Hi,

    What is dwell time, tool temperature, do you have condensation or tool leaking....?
    "Steam" can be from stabilising component also. How many % of cylinder volume you inject and what is cycle...
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    Re: Insert molding metal terminals

    For sealing terminals did you considered silicone seals?
    Something similar we using on connectors that we overmold with TPE.
    If tool desined properly and you dont use some exsesive injection...
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    Re: Nylon 6 Brittle parts

    We are using climatic chamber where we put parts after molding on 24h, 90% humidity and 55C. After process they are more flexible and harder to brake.
    So far we have good resaults with this metod.
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    Re: Hot Runner/Tolerance Issues

    What you use for cleaning of hot-runner? Similar i have similar problem with PA6.6 GF30, solved by proper tool maintanace with compound for cleaning and after production inside of hot-runner is PP....
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    Re: Material Drooling

    Hi,

    If you are able try 6h pre-drying on higer temperature. Depends from material it is posible that needed longer time to dry (had this case in my production).
    I assume temperature is in...
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    Re: Material Drooling

    Hi,

    Few questions:
    -Is material dry?
    -Value of back preassure?
    -How big decompression is and is it before or after dosing?
    -Temperature on nozzle tip (real vaue)?
    -Do you have shut off nozzle...
  8. Thread: MoldTrax

    by nemanja
    Replies
    0
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    1,353

    MoldTrax

    Hello all,

    Is anyone have any experience with software MoldTrax? From presentation is good investment for any company that have tools, but on other hand, thats just comercial, and is hard to...
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    Re: Fire resistant resin

    Hi,

    Do you know what UL 94 V? grade need to have?

    HB: slow burning on a horizontal specimen; burning rate < 76 mm/min for thickness < 3 mm or burning stops before 100 mm
    V-2: burning stops...
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    Re: Adhesion on overmolded PCB with PA 678

    I get as material (semi-product) PCB and i (try) to make it waterproof (pucture below).
    531
    533

    This is before and after overmold. As you can see im also limited with preassure, speed and...
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    Adhesion on overmolded PCB with PA 678

    Hi all,

    I have big problem during overmolding of some PCB. Main function of molded part is to make part waterproof.
    When molding is finished, resaults are good, but after day or so there is...
  12. Thread: Sanity Check

    by nemanja
    Replies
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    1,558

    Re: Sanity Check

    Hi,

    If you made price by customers parameters ofcourse they will put smaller cycle time.
    Dont know how big part is but i have somwhere 40-60s cooling.
    One of idea is to try longer holding...
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    Re: Enhancing flow properties of resin

    Is tool venting OK? Making some additional scratches may hellp you (0,05mm).
  14. Re: Choosing plastic for adhering with EN8 metal part

    Hello,

    Can you be more specific, like what is exact purpoce of plastic?
    Do you need to be waterproof, electrical insulation, damage protection, etc...
    Usually adhesive problems we solve with...
  15. Thread: Back Pressure

    by nemanja
    Replies
    8
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    16,197

    Re: Back Pressure

    Usually there is recommended values for back preassure in material datasheet. Is most of the time OK value.
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    741

    Re: mold change check list

    Im guessing that will depends from mold to mold... Not all molds have same cooling lines, hot-runner connections, program parameters.....
    I tried to standardise all this in curent company where i...
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    Re: mold change check list

    Hello,

    Usualy when needed i make "working instruction" for tools with pictures, drawings and instructions for correct mounting and adjusting tool on machine and chosing of program, also marking of...
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    Re: Problem during TPE processing

    Hi,
    Do you use virgin material? Is it possible that you can mix materials? Is drying necessary and if, how stable process is.
    I didnt work with this material, but i had similar problems with TPE...
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    Re: Overmold Possibility

    Hi,

    Is surface important? We do some sort of "holders" that we put on metal plates. They put metal plates in wanted position, but on other hand they are visible on surface. Holders are molded from...
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    Re: Chiller systems

    Hi,

    In what country is your factory?

    Regards,
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    Re: Shot Size Procedure

    Hi,

    Depends from molding product, dimensions are sometimes more important than cosmetics (at least in my case).
    Im making around 20ccm of cushion plus 98% of shot volume (that is determent during...
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    Re: Loud noise when mould opens.

    Hello,
    Are you sure sound is coming from mold? Check also speeds and pressure drops during mold opening. It happens that machine can make "hydraulic jump" if you go from high speed to low or when...
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    Re: Molding w Flame Retardant

    In my case is PA 66+GF30+FR, and best results (for my process) is to make preventive mold maintenance. Just cleaning tools on certain cycle number (depends from tool) reduced scrap rate from 10% to...
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    Re: Arburg Questions

    Usually you have all info what you need on few screens in "monitoring" part of menu (yellow one). Pictures shows just some of options that you can monitor. Maybe because im so use to Selogica, but i...
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    Re: Cleaning polymer from sprue

    Best so far (at least for my production :) ) is UltraPurge. Cleaner expanding after smelting and "pick up" rest from old and damaged material. Im usually changing from PA 6.6 GF30 to any TPE material...
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