Heat Shock & Peel test Enamel Copper Wire

Thanks . I will follow the procedure and reply.
Thanks again

I assume by not getting the proper results you mean that the wire coil when you remove it from the test oven is cracked. If that is the case then you are probably over curing the wire. Go to your process oven and check it out. Perhaps you can increase the line speed a little bit and the wire will pass heat shock. Other alternative is to decrease overall temperature and this will decrease wire cure.

How are your cut through values, DF values, etc. If they are very good (high) that would support the thought that you may be slightly overcuring the wire.

RB

Thanks for your advice. But our problem is that we don't get the results proper for only these two test the rest of the test are OK.
If you can help me how to achieve the results or the area where I work to get the better results.

Heat shock and peel test are two of many tests of magnet wire. The following link tells you about the various test.

Simply put, you elongate your sample, wrap it around a mandrel, and place in an oven set at 20 Celsius higher than the thermal rating of the wire. If it is 155C wire then the oven is set at 175c. After a period of time, the sample is removed and there should not be visible cracks. Cracks generally are an indication of over cure.

go to the web site in the following info more specific details. Richard

NEMA Magnet Wire Thermal Class Ratings File Format: PDF/Adobe Acrobat
This test is used to. evaluate the resistance to cracking of the film insulation. Some typical test conditions for copper magnet wire are: ...
www.spsx.com/uploadedFiles/News/White_Pa...al-class-ratings.pdf

there are several different types of insulating varnish or enamel. they are also some that are used as overcoats or in between coats. Depending upon the varnish used, the thermal rating of the wire will vary. Without knowing what material you are using, it is somewhat difficult to know what standard you are testing to.