Lamitube for Ointment

Why do some lami-tubes have a single eye-mark, while some others have two eye-marks diametrically opposite to each other?

As per my understanding, the eye mark printed on the ointment tube is to crimp (seal) the tube end after the tube is filled with ointment in a specific pattern. Eye-mark is a kind of sensor printed on the tube so that the packaging machine can sense the eye-mark on the tube and re-position it during crimping (sealing) operation. Positioning of printed matter on the tube is adjusted automatically by the eye-mark sensor on the tube so that with a specific pattern every tube is crimpled (sealed) on the automatic filling & sealing machine. Hence the printed matter is visible on the flat side of every tube, it is not obscured because of wrong crimping position of the tube.
Having one or two eye-marks on tube depends upon the sensor arrangements in the automatic filling and crimping machine.

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This is in continuation of my previous communication about eye mark on ointment tubes and crimping.
Please see the enclosed images of an ointment tube with a proper crimping position adjusted by the eye- mark (you can see the black verticle line on the tube end, this is the eye mark).

Thank you, Sunilji. Just wondered why some have one mark and some others have two.

Yes, please. Having two eye marks may be a requirement for the crimping machine to sense the tube’s position on the machine so that it is properly realigned for crimping.

  • Two eye-marks, positioned diametrically opposite each other, provide a more robust reference system.
  • This configuration is often used in more advanced packaging machines where precision and stability during the production process are crucial.
  • Dual eye-marks enhance the accuracy of the alignment, ensuring that the tube is consistently positioned and cut with high precision