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  1. Thread: Back Pressure

    by nemanja
    Replies
    3
    Views
    317

    Re: Back Pressure

    Usually there is recommended values for back preassure in material datasheet. Is most of the time OK value.
  2. Replies
    4
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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...
  3. Replies
    4
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    741

    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...
  4. Replies
    9
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    1,775

    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...
  5. Replies
    7
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    1,671

    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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    1
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    1,937

    Re: Chiller systems

    Hi,

    In what country is your factory?

    Regards,
  7. Replies
    4
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    2,502

    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...
  8. Replies
    8
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    2,284

    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...
  9. Replies
    6
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    2,876

    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...
  10. Replies
    8
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    4,018

    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...
  11. Replies
    6
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    2,280

    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...
  12. Replies
    6
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    2,280

    Re: Cleaning polymer from sprue

    Mechanical/chemical cleaners? So far was best results, also brass or steel brush, depends from material of sprue (but you need to disassemble completely).
  13. Replies
    3
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    1,614

    Re: Arburg 305 info

    Hi,

    I worked with few models with selogica controls, and all have same system in electrical cabinet. Should be same for all other machines.
    Regards,
  14. Re: General operation of Arburg Allrounder 170 CMD 145-50

    Hello,

    I worked mostly with ARBURGS with SELOGICA operating system. But i assume is more less same principle for older machines. Can you describe alarms?
    Also, manual movement is possible when...
  15. Replies
    8
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    2,579

    Re: Rubber Matt has Hazy Areas

    Im working few years now with TPE and TPV, and your problem can be also caused by not dry or over dried material. So you can do tests with different drying parameters. Beside that adding venting to...
  16. Replies
    23
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    11,471

    Re: Material cushion variation

    Hello,

    We did materials testing on University for chemistry and results show 1% difference in glass fibers from loot to loot.
    Did anyone else did similar tests? I also wonder if this can be...
  17. Replies
    6
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    2,306

    Re: noise at start of opening phase

    Hi,

    Some valves responsible for opening of tool can produce noise like you said. You can tell someone to just open and close tool, or let it run in automatic mode, and try to pinpoint location of...
  18. Replies
    23
    Views
    11,471

    Re: Material cushion variation

    Switch over point change was caused by shooting throu terminals. Operator need to change volume of injected material for little and after is OK. Again in some number of cycles again switch over need...
  19. Replies
    17
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    8,308

    Re: Help! Witness Mark around Gate

    For example, im using one hopper with dry material and dont add any new material till is close to empty, in meanwhile on separate from that machine i have one more dryer who is drying material. When...
  20. Replies
    17
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    8,308

    Re: Help! Witness Mark around Gate

    Hi,
    Try to run two dryers if you have in company, without adding material in one who is on machine. I did same for my problem to be sure that material is always dry.

    Nemanja.
  21. Replies
    23
    Views
    11,471

    Re: Material cushion variation

    Hi,

    We have terminals but for now this is not problem. That was my first thinking but i checked tool and is OK. I had same idea about moisture, and now, just in case, im running two dryers. So...
  22. Replies
    23
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    11,471

    Re: Material cushion variation

    Criss, time in process is different because of sliding table. Movement of table make this process not equal. I didnt think that this can be problem, but i will try to fix that, hold is always on...
  23. Replies
    23
    Views
    11,471

    Re: Material cushion variation

    Hi,
    We didn't solve anything. so far tried reverse, flat and hump profile no results on different temperature range. Here are pictures of problem and some of process data. It is always or to much or...
  24. Replies
    3
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    2,355

    Re: Backup of machine programs

    Hi,

    We have on company server folder for each machine, and there i save back up, on CF stick I have "production" and "archive" folders so operators dont confuse what program to use and programs...
  25. Replies
    23
    Views
    11,471

    Re: Material cushion variation

    For now we running standard heat profile. But I will try reverse profile, and see what will happen.
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