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  • Hello Everyone,

    We are having weight variation in the take up bobbins. For example, Lets say The sample weight of Take up A is 7.78 gm/m. and for take up B is 7.79 gm/m. After filling 100 km in the bobbins, the net weight of Take up A should be near about 778 kgs and take up 2 should have 779 kgs. But we are having a net weight of 790 kgs (12 kgs more) in take up A and 792 kgs (13 kgs more) in the take up B.

    How is this extra weight coming in the bobbins?? We have kept the standard dancer pressure, used almost similar dies. Then what is playing in it to increase the net weight of the bobbin??

    Note: Some of the machines are giving almost equal net weight with respect to the sample weight.
    Read More... 2 days ago
  • Mr Suman Roy created a new topic ' Frequent wire breaks' in the forum.
    Hello everyone,

    We are facing frequent wire breaks in the Niehoff 32 line MMH101 multi wire drawing machine at a very slow speed, 15 m/s from the annealer section and sometimes from the wire drawing section. Analysing the break sample we found most of the breaks due to inclusion in the copper. Beside that another machine of Niehoff is being commissioned which is running at its rated speed of 35 m/s without any break with a lower standard copper than the previous machine.

    Can anybody suggest me what may be the possible reasons if lubricant concentration, dancer pressure, spool condition being maintained as per standard??
    Read More... 2 days ago
  • Mr Monojit Deb replied to the topic 'Pressure variation in Dancer of MMH101' in the forum.
    Dear sir,
    If I am setting a pressure during starting a Job and getting a desired pressure how come the pressure changes in the middle of the bobbin the cylinders may wear with time but can the pressure vary in between the bobbin because of this wear in the cylinders? Can you also please guide me which tension gauge should be used to check tension and how to find variance after checking tension?
    Read More... 3 days ago
  • Rolf D Wurmbach replied to the topic 'Pressure variation in Dancer of MMH101' in the forum.
    You need to check your dancer pressure setting from time to time with a tension gage. Air operated cylinders have wear and since the dancer mostly rides in the middle you have more wear here and this will change the wire tension. Once or twice a year is enough.
    Read More... 3 days ago
  • Rolf D Wurmbach replied to the topic 'Rated speed of Niehoff MWD' in the forum.
    Dear Mr. Deb:
    If you increase the wire you will stretch the wire and you OD becomes smaller. You are losing some anneal or rather elongation as well. For sure the higher dancer weight will give you a denser package, but you or your customer could also have problems with unwinding or flying the wires of for the next process. Therefor it is recommended to stay within the value provided by Niehoff. These values differ by wire size and type of take-up and calculated that you should not have any high stretching and maintain your wire OD.
    Read More... 3 days ago
  • Peter J Stewart-Hay replied to the topic 'Copper wire drawing air quality' in the forum.
    There have been a number of threads on copper wire discoloration in the Forums.

    We therefore refer you to the following threads over the past five or six years.

    Copper(I) Oxide, Cuprous Oxide, Cuprite or Red Copper Oxide (CuO2)
    Cuprous Oxide can easily coat the conductor and it is a brownish-red solid. The chemical formula is CuO2 meaning two oxygen atoms combine with one copper atom. (Cu + O2 = CuO2). On copper wire, you can see the cuprous oxide layer in full color as various shades of reds, oranges, pinks, and purples if the copper has been heated too high (Above about 200 degrees Celsius (392 Fahrenheit) and exposed to oxygen. Moreover keep in mind that when copper is hot, it quickly oxidizes (corrodes or rusts) and this is nothing more than a simple chemical reaction with oxygen.

    On the other hand:
    Copper(II) Oxide, Cupric Oxide (CuO)
    Cupric Oxide can as well easily coat the conductor and it is a black solid. It can be formed by heating copper in air at around 300 - 800°C:

    This is a good starting spot for your issues.
    Read More... 8 days ago
  • Peter J Stewart-Hay created a new topic ' Copper wire drawing air quality' in the forum.
    We Received the following at our offices and have posted it here.

    We are one of the leading manufacture of Building wires and cable in India.
    We want to test the ambient air quality for our factory premises for the purpose of copper reacts with the open air wire surface color ( It may be blackish Or Reddish) .
    Please advise the any test to be conduct through third party environment lab and any particular elements check for precaution for copper wire drawing manufacturing.
    Early action highly appreciated.
    Awaiting for your reply ,

    Thanks & Regards
    Manager Quality

    Read More... 8 days ago