The design of electric eye in flexible packaging (1)
Positioning heat sealing and positioning cutting are often needed in the process of pouch making or automatic packaging of composite film. Therefore, when it comes to positioning cutting, the design of electric eye should be considered. On the contrary, if it has no requirement on the cutting position, then no electric eye is needed.
When we design electric eye of a flexible packaging, normally we would have it placed at the bottom of a pouch, which we believe the packaging would be much prettier that way. Electric eye can be designed on only one side or both side of the roll film, though we would highly suggest to make it on both sides cause by that way it could save a lot of troubles when using the equipment to track the electric eye location cause you won’t need to the adjust the location of photocell eye constantly.
The size of electric eye is very important too. Usually the width of cursor should be no less than 2mm yet no more than 10mm, and the length should be no less than 5mm. It would affect the normal tracking of the equipment if the width too small (less than 2mm) due to the weak signal. However, it would cause few problems as well if it’s too wide (more than 10mm): on the one hand, the appearance of packaging would be less attractive; on the other hand, it would reduce the accuracy of tracking and positioning. And the length of cursor should be no less than 5mm due to the film could be deviated during the packaging process, too short a cursor may cause the cursor to deviate from the photocell eye and lead to the electric eye untraceable.
