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Ply Orientation Inspection

To ensure that tire plies are stacked in alternating layers so the tire is formed properly

Before the operator activates a tire-building machine to form a tire, a PresencePLUS P4 EDGE 1.3 vision sensor inspects the plies to make sure that pieces with opposite biases alternate in the stack.

If two pieces with the same bias are stacked together, the formed tire proceeds through the manufacturing process, then fails balance testing and must be scrapped.

The use of a laser light mounted at an angle to the line is critical to the inspection, because the light bends at the angled edge of the ply, making three-dimensional measurement possible with an inexpensive two-dimensional vision sensor.