What is the correct resin smearing method

2018-11-26 17:20Writer: qyadminReading:

        Resin Smear is the effect of resin adhering to the inner copper layer in the hole wall.

        After cross section, the coating is measured (as shown in the figure below) where resin smear is detected. The smear value may be the ratio (%) based on the width of resin smear to inner layer copper, that has adhered to the hole wall structure as demonstrated in the determine below.
        If the evaluation using stack drilling has been done, all the panels are measured.
        The maximum smearing points are measured around final hit hit counts.
                                          What is the correct resin smearing method

                                  Resin smear ratio[%] = B/A x 100

                        A: Inner copper layer thickness [µm]

                        B: Resin smear width [µm]

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